diff --git a/.gitignore b/.gitignore
index 8b0d17d..e17efac 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 nlvm/nlvm
 nlvm/nlvmr
+nlvm/*.dSYM
 nimcache
 *.s
 /nlvm/nlvm.self
@@ -22,3 +23,4 @@ tools
 dist/
 /megatest.nim
 .vscode
+.DS_Store
\ No newline at end of file
diff --git a/.gitmodules b/.gitmodules
index 46a7f95..074f912 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,4 +1,4 @@
 [submodule "Nim"]
 	path = Nim
-	url = https://github.com/arnetheduck/Nim.git
+	url = https://github.com/gushromp/Nim.git
 	branch = nlvm
diff --git a/Makefile b/Makefile
index c94093d..2d9d6d3 100644
--- a/Makefile
+++ b/Makefile
@@ -17,12 +17,21 @@ LLVM_PAT=0
 
 LLVM_DIR=llvm-$(LLVM_MAJ).$(LLVM_MIN).$(LLVM_PAT).src
 
+OS := $(shell uname)
+ifeq ($(OS),Darwin)
+    SHALIB_EXT := dylib
+else ifeq ($(OS),Linux) 
+    SHALIB_EXT := so
+else
+    $(error "Unsupported OS. Exiting.")
+endif
+
 ifdef STATIC_LLVM
 	NLVMCFLAGS=-d:staticLLVM --dynliboverrideall
 	LLVM_DEP=ext/$(LLVM_DIR)/sta/bin/llvm-config
 	export PATH := $(PWD)/ext/$(LLVM_DIR)/sta/bin:$(PATH)
 else
-	LLVM_DEP=ext/$(LLVM_DIR)/sha/lib/libLLVM-$(LLVM_MAJ).so
+	LLVM_DEP=ext/$(LLVM_DIR)/sha/lib/libLLVM-$(LLVM_MAJ).$(SHALIB_EXT)
 	NLVMCFLAGS?=
 endif
 
@@ -98,7 +107,7 @@ self: nlvm/nlvm.self
 clean:
 	rm -rf $(NLVMC) $(NLVMR) nlvm/nlvm.ll nlvm/nlvm.self.ll nlvm/nlvm.self Nim/testresults/
 
-ext/$(LLVM_DIR)/sha/lib/libLLVM-$(LLVM_MAJ).so:
+ext/$(LLVM_DIR)/sha/lib/libLLVM-$(LLVM_MAJ).$(SHALIB_EXT):
 	sh ./make-llvm.sh $(LLVM_MAJ) $(LLVM_MIN) $(LLVM_PAT) sha \
 		-DLLVM_BUILD_LLVM_DYLIB=1 \
 		-DLLVM_LINK_LLVM_DYLIB=1 \
diff --git a/Nim b/Nim
index ab9af74..a07140a 160000
--- a/Nim
+++ b/Nim
@@ -1 +1 @@
-Subproject commit ab9af74892783e5b763902c7d12a4ae2c4ea3c8a
+Subproject commit a07140a5d91634e1d3eaec7f35fb527651b59838
diff --git a/dl-llvm.sh b/dl-llvm.sh
index b93ac94..6fbbf34 100755
--- a/dl-llvm.sh
+++ b/dl-llvm.sh
@@ -1,5 +1,26 @@
 #!/bin/bash
 
+OS="`uname`"
+ARCH="`uname -m`"
+
+if [ $ARCH == "arm64" ]; then
+  echo "LLVM doesn't provide precompiled binaries for arm64 yet :(. Remove STATIC_LLVM=1 and try again. Exiting..."
+  exit 1
+fi
+
+case $OS in
+  'Linux')
+    SUFFIX="$ARCH-linux-gnu-ubuntu-18.04"
+    ;;
+  'Darwin') 
+    SUFFIX="$ARCH-apple-darwin"
+    ;;
+  *) 
+    echo "Unsupported OS: $OS" 
+    exit 1
+  ;;
+esac
+
 [ $# -ge 4 ] || {
  echo "$0 major minor patch output_dir"
  exit 1
@@ -13,7 +34,6 @@ cd ext
 VER="$1.$2"
 VER2="$VER.$3"
 TGT="$4"
-SUFFIX="x86_64-linux-gnu-ubuntu-18.04"
 
 LLVM_ROOT=llvm-$VER2.src
 
diff --git a/llvm/llvm.nim b/llvm/llvm.nim
index d6292d7..ab9f879 100644
--- a/llvm/llvm.nim
+++ b/llvm/llvm.nim
@@ -3,42 +3,75 @@
 # See the LICENSE file for license info (doh!)
 
 import strutils
+import strformat
+import os
+
+static:
+  if not (defined(linux) or defined(macosx)):
+    echo "Unsupported platform. Exiting."
+    quit(-1)
 
 const
-  LLVMLib = "libLLVM-14.so"
-  LLVMRoot = "../ext/llvm-14.0.0.src/"
-  LLDRoot = "../ext/lld-14.0.0.src/"
+  Root = currentSourcePath.parentDir().parentDir()
   LLVMVersion* = "14.0.0"
+  LLVMRoot = fmt"{Root}/ext/llvm-{LLVMVersion}.src"
+  LLDRoot = fmt"{Root}/ext/lld-{LLVMVersion}.src"
 
 {.passL: "-llldELF" .}
 {.passL: "-llldWasm" .}
 {.passL: "-llldMinGW" .}
 {.passL: "-llldCommon" .}
+{.passL: "-llldMachO" .}
 {.passL: "-lz" .}
+when defined(macosx): 
+  {.passL: "-lxar" .}
 
 when defined(staticLLVM):
   const
-    LLVMOut = LLVMRoot & "sta/"
+    LLVMOut = fmt"{LLVMRoot}/sta"
+
+  {.passL: gorge(fmt"{LLVMRoot}/sta/bin/llvm-config --libs all").}
 
-  {.passL: gorge(LLVMRoot & "sta/bin/llvm-config --libs all").}
+  when defined(macosx):
+    const SDKRoot = gorge("xcrun --sdk macosx --show-sdk-path")
+    {.passC: fmt"-isysroot{SDKRoot}".}
+    {.passL: fmt"-Wl,-syslibroot,{SDKRoot}".}
 
 else:
   const
-    LLVMOut = LLVMRoot & "sha/"
+    LLVMOut = fmt"{LLVMRoot}/sha"
+
+  when defined(macosx):
+    {.passL: "-lLLVM".}
+    {.passL: fmt"-Wl,-rpath,@loader_path/../ext/llvm-{LLVMVersion}.src/sha/lib".}
+
+  elif defined(linux):
+    {.passL: "-lLLVM-14".}
+    {.passL: fmt"-Wl,'-rpath=$ORIGIN/../ext/llvm-{LLVMVersion}.src/sha/lib'".}
+    
 
-  {.passL: "-lLLVM-14".}
-  {.passL: "-Wl,'-rpath=$ORIGIN/" & LLVMOut & "lib/'".}
+{.passC: fmt"-I{LLVMRoot}/include".}
+{.passC: fmt"-I{LLVMOut}/include".}
 
-{.passC: "-I" & LLVMRoot & "include".}
-{.passC: "-I" & LLVMOut & "include".}
+{.passC: fmt"-I{LLDRoot}/include".}
 
-{.passC: "-I" & LLDRoot & "include".}
+when defined(linux):
+  {.passL: "-Wl,--as-needed".}
+else:
+  {.passL: "-Wl".}
+
+{.passL: gorge(fmt"{LLVMOut}/bin/llvm-config --ldflags").}
+{.passL: gorge(fmt"{LLVMOut}/bin/llvm-config --system-libs").}
 
-{.passL: "-Wl,--as-needed".}
-{.passL: gorge(LLVMOut & "bin/llvm-config --ldflags").}
-{.passL: gorge(LLVMOut & "bin/llvm-config --system-libs").}
+{.compile("wrapper.cc", "-std=c++14").}
 
-{.compile: "wrapper.cc".}
+when defined(linux):
+  const
+    LLVMLib = "libLLVM-14.so"
+elif defined(macosx):
+  const 
+    LLVMLib = "libLLVM.dylib"
+    LLDBinary* = fmt"{LLVMOut}/bin/ld64.lld"
 
 # Includes and helpers for generated code
 type
@@ -264,6 +297,18 @@ proc nimLLDLinkElf*(args: openArray[string]): string =
     result = strip($tmp)
     disposeMessage(tmp)
 
+proc nimLLDLinkMachO*(
+  argv: cstringArray, argc: cint): cstring {.importc: "LLVMNimLLDLinkMachO".}
+
+proc nimLLDLinkMachO*(args: openArray[string]): string =
+  let argv = allocCStringArray(args)
+  defer: deallocCStringArray(argv)
+
+  let tmp = nimLLDLinkMachO(argv, args.len.cint)
+  if not tmp.isNil:
+    result = strip($tmp)
+    disposeMessage(tmp)
+
 proc nimLLDLinkWasm*(
   argv: cstringArray, argc: cint): cstring {.importc: "LLVMNimLLDLinkWasm".}
 
diff --git a/llvm/wrapper.cc b/llvm/wrapper.cc
index a6027bb..84bf5d6 100644
--- a/llvm/wrapper.cc
+++ b/llvm/wrapper.cc
@@ -8,6 +8,8 @@
 #include "llvm-c/Types.h"
 #include "llvm-c/Core.h"
 
+#include <iostream>
+
 using namespace llvm;
 
 typedef DIBuilder *LLVMNimDIBuilderRef;
@@ -49,12 +51,27 @@ extern "C" const char* LLVMNimLLDLinkElf(const char **args, size_t arg_count) {
     SmallVector<char, 128> osv, esv;
     raw_svector_ostream os(osv), es(esv);
 
-    if (!lld::elf::link(array_ref_args, os, es, false, false)) {
+    if (lld::elf::link(array_ref_args, os, es, false, false)) {
       osv.push_back(0);
       return LLVMCreateMessage(&osv[0]);
+    } else {
+      esv.push_back(0);
+      return LLVMCreateMessage(&esv[0]);
     }
+}
+
+extern "C" const char* LLVMNimLLDLinkMachO(const char **args, size_t arg_count) {
+    ArrayRef<const char *> array_ref_args(args, arg_count);
+    SmallVector<char, 128> osv, esv;
+    raw_svector_ostream os(osv), es(esv);
 
-    return nullptr;
+    if (lld::macho::link(array_ref_args, os, es, false, false)) {
+      osv.push_back(0);
+      return LLVMCreateMessage(&osv[0]);
+    } else {
+      esv.push_back(0);
+      return LLVMCreateMessage(&esv[0]);
+    }
 }
 
 extern "C" const char* LLVMNimLLDLinkWasm(const char **args, size_t arg_count) {
@@ -62,10 +79,11 @@ extern "C" const char* LLVMNimLLDLinkWasm(const char **args, size_t arg_count) {
     SmallVector<char, 128> osv, esv;
     raw_svector_ostream os(osv), es(esv);
 
-    if (!lld::wasm::link(array_ref_args, os, es, false, false)) {
+    if (lld::wasm::link(array_ref_args, os, es, false, false)) {
       osv.push_back(0);
       return LLVMCreateMessage(&osv[0]);
+    } else {
+      esv.push_back(0);
+      return LLVMCreateMessage(&esv[0]);
     }
-
-    return nullptr;
 }
diff --git a/make-llvm.sh b/make-llvm.sh
index 27fde5b..c6a9cd9 100755
--- a/make-llvm.sh
+++ b/make-llvm.sh
@@ -3,6 +3,20 @@
 # Build llvm, as used in the Makefile
 # A bit broken because it doesn't track cmake options and deps correctly
 
+OS="`uname`"
+case $OS in
+  'Linux')
+    ADDITIONAL_CMAKE_ARGS="-DLLVM_USE_LINKER=gold"
+    ;;
+  'Darwin') 
+    ADDITIONAL_CMAKE_ARGS=""
+    ;;
+  *) 
+    echo "Unsupported OS: $OS" 
+    exit 1
+  ;;
+esac
+
 [ $# -gt 4 ] || {
  echo "$0 major minor patch output_dir cmake_options*"
  exit 1
@@ -39,7 +53,7 @@ LLD_ROOT=lld-$VER2.src
 [ -d $LLVM_ROOT/projects/lld ] || {
   rm -rf $LLVM_ROOT/projects/lld
   cd $LLVM_ROOT/projects
-  ln -sfr ../../$LLD_ROOT lld
+  ln -sf ../../$LLD_ROOT lld
   cd ../..
 }
 
@@ -49,7 +63,7 @@ LLD_ROOT=lld-$VER2.src
 
 [ -f libunwind-$VER2/CMakeLists.txt ] || {
   tar xf libunwind-$VER2.src.tar.xz
-  cp -ar libunwind-$VER2.src/include/mach-o $LLD_ROOT/include
+  cp -a libunwind-$VER2.src/include/mach-o $LLD_ROOT/include
 }
 
 cd $LLVM_ROOT
@@ -58,6 +72,6 @@ mkdir -p $TGT
 cd $TGT
 
 shift 4
-cmake -GNinja -DLLVM_USE_LINKER=gold LLVM_INCLUDE_BENCHMARKS=OFF "$@" ..
+cmake -GNinja "$@" ..
 
 ninja
diff --git a/nlvm-lib/nlvmbase-amd64-MacOSX.ll b/nlvm-lib/nlvmbase-amd64-MacOSX.ll
new file mode 100644
index 0000000..15745b6
--- /dev/null
+++ b/nlvm-lib/nlvmbase-amd64-MacOSX.ll
@@ -0,0 +1,708 @@
+; Workarounds for:
+; * bugs in nlvm
+; * nim standard library including macros from header files
+; * stuff in nimbase.h
+; For this to go away, one would have to patch upstream to
+; avoid depending on c headers in the stdlib, and fix some bugs
+; in nlvm
+
+target datalayout = "e-m:o-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-macos"
+
+; ioctls.h
+@FIONCLEX = linkonce_odr constant i32 21584
+@FIOCLEX = linkonce_odr constant i32 21585
+
+; pthreads.h
+@PTHREAD_MUTEX_RECURSIVE = linkonce_odr constant i32 1
+
+; signal.h
+@SIG_ERR = global void (i32)* inttoptr (i32 -1 to void (i32)*), align 8
+@SIG_DFL = global void (i32)* inttoptr (i32 0 to void (i32)*), align 8
+@SIG_IGN = global void (i32)* inttoptr (i32 1 to void (i32)*), align 8
+@SEGV_MAPERR = linkonce_odr constant i32 1
+@SIGEV_NONE = linkonce_odr constant i32 1
+@SIGEV_SIGNAL = linkonce_odr constant i32 2
+@SIGEV_THREAD = linkonce_odr constant i32 3
+@SIGABRT = linkonce_odr constant i32 6
+@SIGALRM = linkonce_odr constant i32 14
+@SIGBUS = linkonce_odr constant i32 10
+@SIGCHLD = linkonce_odr constant i32 20
+@SIGCONT = linkonce_odr constant i32 19
+@SIGFPE = linkonce_odr constant i32 8
+@SIGHUP = linkonce_odr constant i32 1
+@SIGILL = linkonce_odr constant i32 4
+@SIGINT = linkonce_odr constant i32 2
+@SIGKILL = linkonce_odr constant i32 9
+@SIGPIPE = linkonce_odr constant i32 13
+@SIGQUIT = linkonce_odr constant i32 3
+@SIGSEGV = linkonce_odr constant i32 11
+@SIGSTOP = linkonce_odr constant i32 17
+@SIGTERM = linkonce_odr constant i32 15
+@SIGTSTP = linkonce_odr constant i32 18
+@SIGTTIN = linkonce_odr constant i32 21
+@SIGTTOU = linkonce_odr constant i32 22
+@SIGUSR1 = linkonce_odr constant i32 30
+@SIGUSR2 = linkonce_odr constant i32 31
+@SIGPOLL = linkonce_odr constant i32 23
+@SIGPROF = linkonce_odr constant i32 27
+@SIGSYS = linkonce_odr constant i32 12
+@SIGTRAP = linkonce_odr constant i32 5
+@SIGURG = linkonce_odr constant i32 16
+@SIGVTALRM = linkonce_odr constant i32 26
+@SIGXCPU = linkonce_odr constant i32 24
+@SIGXFSZ = linkonce_odr constant i32 25
+@SA_NOCLDSTOP = linkonce_odr constant i32 1
+@SIG_BLOCK = linkonce_odr constant i32 1
+@SIG_UNBLOCK = linkonce_odr constant i32 2
+@SIG_SETMASK = linkonce_odr constant i32 0
+@SS_ONSTACK = linkonce_odr constant i32 1
+@SS_DISABLE = linkonce_odr constant i32 2
+@MINSIGSTKSZ = linkonce_odr constant i32 2048
+@SIGSTKSZ = linkonce_odr constant i32 8192
+
+; errno.h
+@EACCES = linkonce_odr constant i32 13
+@EADDRINUSE = linkonce_odr constant i32 48
+@EADDRNOTAVAIL = linkonce_odr constant i32 49
+@EAFNOSUPPORT = linkonce_odr constant i32 47
+@EAGAIN = linkonce_odr constant i32 35
+@EALREADY = linkonce_odr constant i32 37
+@EBADF = linkonce_odr constant i32 9
+@EBADMSG = linkonce_odr constant i32 94
+@EBUSY = linkonce_odr constant i32 16
+@ECANCELED = linkonce_odr constant i32 89
+@ECHILD = linkonce_odr constant i32 10
+@ECONNABORTED = linkonce_odr constant i32 53
+@ECONNREFUSED = linkonce_odr constant i32 61
+@ECONNRESET = linkonce_odr constant i32 54
+@EDEADLK = linkonce_odr constant i32 11
+@EDESTADDRREQ = linkonce_odr constant i32 39
+@EDOM = linkonce_odr constant i32 33
+@EDQUOT = linkonce_odr constant i32 69
+@EEXIST = linkonce_odr constant i32 17
+@EFAULT = linkonce_odr constant i32 14
+@EFBIG = linkonce_odr constant i32 27
+@EHOSTUNREACH = linkonce_odr constant i32 65
+@EIDRM = linkonce_odr constant i32 90
+@EILSEQ = linkonce_odr constant i32 92
+@EINPROGRESS = linkonce_odr constant i32 36
+@EINTR = linkonce_odr constant i32 4
+@EINVAL = linkonce_odr constant i32 22
+@EIO = linkonce_odr constant i32 5
+@EISCONN = linkonce_odr constant i32 56
+@EISDIR = linkonce_odr constant i32 21
+@ELOOP = linkonce_odr constant i32 62
+@EMFILE = linkonce_odr constant i32 24
+@EMLINK = linkonce_odr constant i32 31
+@EMSGSIZE = linkonce_odr constant i32 40
+@EMULTIHOP = linkonce_odr constant i32 95
+@ENAMETOOLONG = linkonce_odr constant i32 63
+@ENETDOWN = linkonce_odr constant i32 50
+@ENETRESET = linkonce_odr constant i32 52
+@ENETUNREACH = linkonce_odr constant i32 51
+@ENFILE = linkonce_odr constant i32 23
+@ENOBUFS = linkonce_odr constant i32 55
+@ENODATA = linkonce_odr constant i32 96
+@ENODEV = linkonce_odr constant i32 19
+@ENOENT = linkonce_odr constant i32 2
+@ENOEXEC = linkonce_odr constant i32 8
+@ENOLCK = linkonce_odr constant i32 77
+@ENOLINK = linkonce_odr constant i32 97
+@ENOMEM = linkonce_odr constant i32 12
+@ENOMSG = linkonce_odr constant i32 91
+@ENOPROTOOPT = linkonce_odr constant i32 42
+@ENOSPC = linkonce_odr constant i32 28
+@ENOSR = linkonce_odr constant i32 98
+@ENOSTR = linkonce_odr constant i32 99
+@ENOSYS = linkonce_odr constant i32 78
+@ENOTCONN = linkonce_odr constant i32 57
+@ENOTDIR = linkonce_odr constant i32 20
+@ENOTEMPTY = linkonce_odr constant i32 66
+@ENOTSOCK = linkonce_odr constant i32 38
+@ENOTSUP = linkonce_odr constant i32 45
+@ENOTTY = linkonce_odr constant i32 25
+@ENXIO = linkonce_odr constant i32 6
+@EOPNOTSUPP = linkonce_odr constant i32 102
+@EOVERFLOW = linkonce_odr constant i32 84
+@EPERM = linkonce_odr constant i32 1
+@EPIPE = linkonce_odr constant i32 32
+@EPROTO = linkonce_odr constant i32 100
+@EPROTONOSUPPORT = linkonce_odr constant i32 43
+@EPROTOTYPE = linkonce_odr constant i32 41
+@ERANGE = linkonce_odr constant i32 34
+@EROFS = linkonce_odr constant i32 30
+@ESPIPE = linkonce_odr constant i32 29
+@ESRCH = linkonce_odr constant i32 3
+@ESTALE = linkonce_odr constant i32 70
+@ETIME = linkonce_odr constant i32 101
+@ETIMEDOUT = linkonce_odr constant i32 60
+@ETXTBSY = linkonce_odr constant i32 26
+@EWOULDBLOCK = linkonce_odr constant i32 35
+@EXDEV = linkonce_odr constant i32 18
+
+; spawn.h
+@POSIX_SPAWN_RESETIDS = linkonce_odr constant i32 1
+@POSIX_SPAWN_SETPGROUP = linkonce_odr constant i32 2
+@POSIX_SPAWN_SETSCHEDPARAM = linkonce_odr constant i32 16
+@POSIX_SPAWN_SETSCHEDULER = linkonce_odr constant i32 32
+@POSIX_SPAWN_SETSIGDEF = linkonce_odr constant i32 4
+@POSIX_SPAWN_SETSIGMASK = linkonce_odr constant i32 8
+@POSIX_SPAWN_USEVFORK = linkonce_odr constant i32 64
+
+; sys/stat.h
+@S_IFBLK = linkonce_odr constant i32 24576
+@S_IFCHR = linkonce_odr constant i32 8192
+@S_IFDIR = linkonce_odr constant i32 16384
+@S_IFIFO = linkonce_odr constant i32 4096
+@S_IFLNK = linkonce_odr constant i32 40960
+@S_IFMT = linkonce_odr constant i32 61440
+@S_IFREG = linkonce_odr constant i32 32768
+@S_IFSOCK = linkonce_odr constant i32 49152
+@S_IRGRP = linkonce_odr constant i32 32
+@S_IROTH = linkonce_odr constant i32 4
+@S_IRUSR = linkonce_odr constant i32 256
+@S_IRWXG = linkonce_odr constant i32 56
+@S_IRWXO = linkonce_odr constant i32 7
+@S_IRWXU = linkonce_odr constant i32 448
+@S_ISGID = linkonce_odr constant i32 1024
+@S_ISUID = linkonce_odr constant i32 2048
+@S_ISVTX = linkonce_odr constant i32 512
+@S_IWGRP = linkonce_odr constant i32 16
+@S_IWOTH = linkonce_odr constant i32 2
+@S_IWUSR = linkonce_odr constant i32 128
+@S_IXGRP = linkonce_odr constant i32 8
+@S_IXOTH = linkonce_odr constant i32 1
+@S_IXUSR = linkonce_odr constant i32 64 
+
+; stdio.h
+@_IOFBF = linkonce_odr constant i32 0
+@_IOLBF = linkonce_odr constant i32 1
+@_IONBF = linkonce_odr constant i32 2
+@L_ctermid = linkonce_odr constant i32 9
+
+; syscall.h
+@SYS_getrandom = linkonce_odr constant i32 318
+
+; sys/ioctl.h
+@TIOCGWINSZ = linkonce_odr constant i32 21523
+
+; time.h
+@CLOCK_REALTIME = linkonce_odr constant i32 0
+@CLOCKS_PER_SEC = linkonce_odr constant i64 1000000
+
+; termios.h
+@VINTR = linkonce_odr constant i32 0
+@VQUIT = linkonce_odr constant i32 1
+@VERASE = linkonce_odr constant i32 2
+@VKILL = linkonce_odr constant i32 3
+@VEOF = linkonce_odr constant i32 4
+@VTIME = linkonce_odr constant i32 5
+@VMIN = linkonce_odr constant i32 6
+@VSTART = linkonce_odr constant i32 8
+@VSTOP = linkonce_odr constant i32 9
+@VSUSP = linkonce_odr constant i32 10
+@VEOL = linkonce_odr constant i32 11
+@IGNBRK = linkonce_odr constant i32 1
+@BRKINT = linkonce_odr constant i32 2
+@IGNPAR = linkonce_odr constant i32 4
+@PARMRK = linkonce_odr constant i32 8
+@INPCK = linkonce_odr constant i32 16
+@ISTRIP = linkonce_odr constant i32 32
+@INLCR = linkonce_odr constant i32 64
+@IGNCR = linkonce_odr constant i32 128
+@ICRNL = linkonce_odr constant i32 256
+@IUCLC = linkonce_odr constant i32 512
+@IXON = linkonce_odr constant i32 1024
+@IXANY = linkonce_odr constant i32 2048
+@IXOFF = linkonce_odr constant i32 4096
+@OPOST = linkonce_odr constant i32 1
+@ONLCR = linkonce_odr constant i32 4
+@OCRNL = linkonce_odr constant i32 8
+@ONOCR = linkonce_odr constant i32 16
+@ONLRET = linkonce_odr constant i32 32
+@OFILL = linkonce_odr constant i32 64
+@OFDEL = linkonce_odr constant i32 128
+@NLDLY = linkonce_odr constant i32 256
+@NL0 = linkonce_odr constant i32 0
+@NL1 = linkonce_odr constant i32 256
+@CRDLY = linkonce_odr constant i32 1536
+@CR0 = linkonce_odr constant i32 0
+@CR1 = linkonce_odr constant i32 512
+@CR2 = linkonce_odr constant i32 1024
+@CR3 = linkonce_odr constant i32 1536
+@TABDLY = linkonce_odr constant i32 6144
+@TAB0 = linkonce_odr constant i32 0
+@TAB1 = linkonce_odr constant i32 2048
+@TAB2 = linkonce_odr constant i32 4096
+@TAB3 = linkonce_odr constant i32 6144
+@BSDLY = linkonce_odr constant i32 8192
+@BS0 = linkonce_odr constant i32 0
+@BS1 = linkonce_odr constant i32 8192
+@FFDLY = linkonce_odr constant i32 32768
+@FF0 = linkonce_odr constant i32 0
+@FF1 = linkonce_odr constant i32 32768
+@VTDLY = linkonce_odr constant i32 16384
+@VT0 = linkonce_odr constant i32 0
+@VT1 = linkonce_odr constant i32 16384
+@B0 = linkonce_odr constant i32 0
+@B50 = linkonce_odr constant i32 1
+@B75 = linkonce_odr constant i32 2
+@B110 = linkonce_odr constant i32 3
+@B134 = linkonce_odr constant i32 4
+@B150 = linkonce_odr constant i32 5
+@B200 = linkonce_odr constant i32 6
+@B300 = linkonce_odr constant i32 7
+@B600 = linkonce_odr constant i32 8
+@B1200 = linkonce_odr constant i32 9
+@B1800 = linkonce_odr constant i32 10
+@B2400 = linkonce_odr constant i32 11
+@B4800 = linkonce_odr constant i32 12
+@B9600 = linkonce_odr constant i32 13
+@B19200 = linkonce_odr constant i32 14
+@B38400 = linkonce_odr constant i32 15
+@EXTA = linkonce_odr constant i32 14
+@EXTB = linkonce_odr constant i32 15
+@CSIZE = linkonce_odr constant i32 48
+@CS5 = linkonce_odr constant i32 0
+@CS6 = linkonce_odr constant i32 16
+@CS7 = linkonce_odr constant i32 32
+@CS8 = linkonce_odr constant i32 48
+@CSTOPB = linkonce_odr constant i32 64
+@CREAD = linkonce_odr constant i32 128
+@PARENB = linkonce_odr constant i32 256
+@PARODD = linkonce_odr constant i32 512
+@HUPCL = linkonce_odr constant i32 1024
+@CLOCAL = linkonce_odr constant i32 2048
+@ISIG = linkonce_odr constant i32 1
+@ICANON = linkonce_odr constant i32 2
+@ECHO = linkonce_odr constant i32 8
+@ECHOE = linkonce_odr constant i32 16
+@ECHOK = linkonce_odr constant i32 32
+@ECHONL = linkonce_odr constant i32 64
+@NOFLSH = linkonce_odr constant i32 128
+@TOSTOP = linkonce_odr constant i32 256
+@IEXTEN = linkonce_odr constant i32 32768
+@TCOOFF = linkonce_odr constant i32 0
+@TCOON = linkonce_odr constant i32 1
+@TCIOFF = linkonce_odr constant i32 2
+@TCION = linkonce_odr constant i32 3
+@TCIFLUSH = linkonce_odr constant i32 0
+@TCOFLUSH = linkonce_odr constant i32 1
+@TCIOFLUSH = linkonce_odr constant i32 2
+@TCSANOW = linkonce_odr constant i32 0
+@TCSADRAIN = linkonce_odr constant i32 1
+@TCSAFLUSH = linkonce_odr constant i32 2
+
+; fcntl.h
+@F_GETFD = linkonce_odr constant i32 1
+@F_SETFD = linkonce_odr constant i32 2
+@FD_CLOEXEC = linkonce_odr constant i32 1
+
+; sys/wait.h
+@WNOHANG = linkonce_odr constant i32 1
+@WUNTRACED = linkonce_odr constant i32 2
+@WEXITED = linkonce_odr constant i32 4
+@WSTOPPED = linkonce_odr constant i32 2
+@WCONTINUED = linkonce_odr constant i32 8
+@WNOWAIT = linkonce_odr constant i32 16777216
+
+; copyfile.h
+@COPYFILE_ACL	= linkonce_odr constant i32 1
+@COPYFILE_STAT = linkonce_odr constant i32 2
+@COPYFILE_XATTR	= linkonce_odr constant i32 4
+@COPYFILE_DATA = linkonce_odr constant i32 8
+
+; sys/wait.h
+; proc WEXITSTATUS*(s: cint): cint =  (s and 0xff00) shr 8
+; proc WTERMSIG*(s:cint): cint = s and 0x7f
+; proc WSTOPSIG*(s:cint): cint = WEXITSTATUS(s)
+; proc WIFEXITED*(s:cint) : bool = WTERMSIG(s) == 0
+; proc WIFSIGNALED*(s:cint) : bool = (cast[int8]((s and 0x7f) + 1) shr 1) > 0
+; proc WIFSTOPPED*(s:cint) : bool = (s and 0xff) == 0x7f
+; proc WIFCONTINUED*(s:cint) : bool = s == WCONTINUED
+
+define linkonce_odr i32 @WEXITSTATUS(i32 %m) {
+  %1 = and i32 %m, 65280
+  %2 = ashr i32 %1, 8
+  ret i32 %2
+}
+
+define linkonce_odr i32 @WTERMSIG(i32 %m) {
+  %1 = and i32 %m, 127
+  ret i32 %1
+}
+
+; unistd.h
+define linkonce_odr i8 @S_ISDIR(i32 %m) {
+  %1 = and i32 %m, 61440
+  %2 = icmp eq i32 %1, 16384
+  %3 = zext i1 %2 to i8
+  ret i8 %3
+}
+define linkonce_odr i8 @S_ISCHR(i32 %m) {
+  %1 = and i32 %m, 61440
+  %2 = icmp eq i32 %1, 8192
+  %3 = zext i1 %2 to i8
+  ret i8 %3
+}
+define linkonce_odr i8 @S_ISBLK(i32 %m) {
+  %1 = and i32 %m, 61440
+  %2 = icmp eq i32 %1, 24576
+  %3 = zext i1 %2 to i8
+  ret i8 %3
+}
+define linkonce_odr i8 @S_ISREG(i32 %m) {
+  %1 = and i32 %m, 61440
+  %2 = icmp eq i32 %1, 32768
+  %3 = zext i1 %2 to i8
+  ret i8 %3
+}
+define linkonce_odr i8 @S_ISFIFO(i32 %m) {
+  %1 = and i32 %m, 61440
+  %2 = icmp eq i32 %1, 4096
+  %3 = zext i1 %2 to i8
+  ret i8 %3
+}
+define linkonce_odr i8 @S_ISLNK(i32 %m) {
+  %1 = and i32 %m, 61440
+  %2 = icmp eq i32 %1, 40960
+  %3 = zext i1 %2 to i8
+  ret i8 %3
+}
+define linkonce_odr i8 @S_ISSOCK(i32 %m) {
+  %1 = and i32 %m, 61440
+  %2 = icmp eq i32 %1, 49152
+  %3 = zext i1 %2 to i8
+  ret i8 %3
+}
+; sys/select.h
+%fd_set = type { [16 x i64] }
+
+define linkonce_odr void @FD_ZERO(%fd_set* %0) {
+  %2 = alloca %fd_set*, align 8
+  %3 = alloca i32, align 4
+  %4 = alloca %fd_set*, align 8
+  store %fd_set* %0, %fd_set** %2, align 8
+  br label %5
+
+5:                                                ; preds = %1
+  %6 = load %fd_set*, %fd_set** %2, align 8
+  store %fd_set* %6, %fd_set** %4, align 8
+  store i32 0, i32* %3, align 4
+  br label %7
+
+7:                                                ; preds = %17, %5
+  %8 = load i32, i32* %3, align 4
+  %9 = zext i32 %8 to i64
+  %10 = icmp ult i64 %9, 16
+  br i1 %10, label %11, label %20
+
+11:                                               ; preds = %7
+  %12 = load %fd_set*, %fd_set** %4, align 8
+  %13 = getelementptr inbounds %fd_set, %fd_set* %12, i32 0, i32 0
+  %14 = load i32, i32* %3, align 4
+  %15 = zext i32 %14 to i64
+  %16 = getelementptr inbounds [16 x i64], [16 x i64]* %13, i64 0, i64 %15
+  store i64 0, i64* %16, align 8
+  br label %17
+
+17:                                               ; preds = %11
+  %18 = load i32, i32* %3, align 4
+  %19 = add i32 %18, 1
+  store i32 %19, i32* %3, align 4
+  br label %7
+
+20:                                               ; preds = %7
+  br label %21
+
+21:                                               ; preds = %20
+  ret void
+}
+
+define linkonce_odr void @FD_SET(i32 %0, %fd_set* %1) {
+  %3 = alloca i32, align 4
+  %4 = alloca %fd_set*, align 8
+  store i32 %0, i32* %3, align 4
+  store %fd_set* %1, %fd_set** %4, align 8
+  %5 = load i32, i32* %3, align 4
+  %6 = srem i32 %5, 64
+  %7 = zext i32 %6 to i64
+  %8 = shl i64 1, %7
+  %9 = load %fd_set*, %fd_set** %4, align 8
+  %10 = getelementptr inbounds %fd_set, %fd_set* %9, i32 0, i32 0
+  %11 = load i32, i32* %3, align 4
+  %12 = sdiv i32 %11, 64
+  %13 = sext i32 %12 to i64
+  %14 = getelementptr inbounds [16 x i64], [16 x i64]* %10, i64 0, i64 %13
+  %15 = load i64, i64* %14, align 8
+  %16 = or i64 %15, %8
+  store i64 %16, i64* %14, align 8
+  ret void
+}
+
+define linkonce_odr i32 @FD_ISSET(i32 %0, %fd_set* %1) {
+  %3 = alloca i32, align 4
+  %4 = alloca %fd_set*, align 8
+  store i32 %0, i32* %3, align 4
+  store %fd_set* %1, %fd_set** %4, align 8
+  %5 = load %fd_set*, %fd_set** %4, align 8
+  %6 = getelementptr inbounds %fd_set, %fd_set* %5, i32 0, i32 0
+  %7 = load i32, i32* %3, align 4
+  %8 = sdiv i32 %7, 64
+  %9 = sext i32 %8 to i64
+  %10 = getelementptr inbounds [16 x i64], [16 x i64]* %6, i64 0, i64 %9
+  %11 = load i64, i64* %10, align 8
+  %12 = load i32, i32* %3, align 4
+  %13 = srem i32 %12, 64
+  %14 = zext i32 %13 to i64
+  %15 = shl i64 1, %14
+  %16 = and i64 %11, %15
+  %17 = icmp ne i64 %16, 0
+  %18 = zext i1 %17 to i32
+  ret i32 %18
+}
+
+define linkonce_odr i8 @WIFEXITED(i32 %m) {
+  %1 = and i32 %m, 127
+  %2 = icmp eq i32 %1, 0
+  %3 = zext i1 %2 to i8
+  ret i8 %3
+}
+
+define linkonce_odr i8 @WIFSIGNALED(i32 %m) {
+  %1 = shl i32 %m, 24
+  %2 = and i32 %1, 2130706432
+  %3 = add nuw i32 %2, 16777216
+  %4 = ashr i32 %3, 25
+  %5 = icmp sgt i32 %4, 0
+  %6 = zext i1 %5 to i8
+  ret i8 %6
+}
+; nimbase.h
+
+declare void @llvm.memset.p0i8.i64(i8*, i8, i64, i32, i1)
+
+define linkonce_odr void @zeroMem(i8* %p, i64 %s) {
+  call void @llvm.memset.p0i8.i64(i8* %p, i8 0, i64 %s, i32 0, i1 false)
+  ret void
+}
+
+declare i32 @memcmp(i8*, i8*, i64)
+
+define linkonce_odr i8 @equalMem(i8* %a, i8* %b, i64 %l) {
+  %1 = call i32 @memcmp(i8* %a, i8* %b, i64 %l)
+  %2 = icmp eq i32 %1, 0
+  %3 = zext i1 %2 to i8
+  ret i8 %3
+}
+
+define linkonce_odr i1 @likely(i1 %a) {
+  ret i1 %a
+}
+
+define linkonce_odr i1 @unlikely(i1 %a) {
+  ret i1 %a
+}
+
+declare i32 @llvm.bswap.i32(i32)
+
+define linkonce_odr zeroext i8 @IN6_IS_ADDR_UNSPECIFIED(i8* nocapture readonly) local_unnamed_addr {
+  %2 = bitcast i8* %0 to i32*
+  %3 = load i32, i32* %2, align 4
+  %4 = icmp eq i32 %3, 0
+  br i1 %4, label %5, label %20
+
+; <label>:5:                                      ; preds = %1
+  %6 = getelementptr inbounds i8, i8* %0, i64 4
+  %7 = bitcast i8* %6 to i32*
+  %8 = load i32, i32* %7, align 4
+  %9 = icmp eq i32 %8, 0
+  br i1 %9, label %10, label %20
+
+; <label>:10:                                     ; preds = %5
+  %11 = getelementptr inbounds i8, i8* %0, i64 8
+  %12 = bitcast i8* %11 to i32*
+  %13 = load i32, i32* %12, align 4
+  %14 = icmp eq i32 %13, 0
+  br i1 %14, label %15, label %20
+
+; <label>:15:                                     ; preds = %10
+  %16 = getelementptr inbounds i8, i8* %0, i64 12
+  %17 = bitcast i8* %16 to i32*
+  %18 = load i32, i32* %17, align 4
+  %19 = icmp eq i32 %18, 0
+  br label %20
+
+; <label>:20:                                     ; preds = %15, %10, %5, %1
+  %21 = phi i1 [ false, %10 ], [ false, %5 ], [ false, %1 ], [ %19, %15 ]
+  %22 = zext i1 %21 to i8
+  ret i8 %22
+}
+
+; Function Attrs: nounwind optsize readonly uwtable
+define linkonce_odr zeroext i8 @IN6_IS_ADDR_LOOPBACK(i8* nocapture readonly) local_unnamed_addr {
+  %2 = bitcast i8* %0 to i32*
+  %3 = load i32, i32* %2, align 4
+  %4 = icmp eq i32 %3, 0
+  br i1 %4, label %5, label %21
+
+; <label>:5:                                      ; preds = %1
+  %6 = getelementptr inbounds i8, i8* %0, i64 4
+  %7 = bitcast i8* %6 to i32*
+  %8 = load i32, i32* %7, align 4
+  %9 = icmp eq i32 %8, 0
+  br i1 %9, label %10, label %21
+
+; <label>:10:                                     ; preds = %5
+  %11 = getelementptr inbounds i8, i8* %0, i64 8
+  %12 = bitcast i8* %11 to i32*
+  %13 = load i32, i32* %12, align 4
+  %14 = icmp eq i32 %13, 0
+  br i1 %14, label %15, label %21
+
+; <label>:15:                                     ; preds = %10
+  %16 = getelementptr inbounds i8, i8* %0, i64 12
+  %17 = bitcast i8* %16 to i32*
+  %18 = load i32, i32* %17, align 4
+  %19 = tail call i32 @llvm.bswap.i32(i32 1)
+  %20 = icmp eq i32 %18, %19
+  br label %21
+
+; <label>:21:                                     ; preds = %15, %10, %5, %1
+  %22 = phi i1 [ false, %10 ], [ false, %5 ], [ false, %1 ], [ %20, %15 ]
+  %23 = zext i1 %22 to i8
+  ret i8 %23
+}
+
+; Function Attrs: nounwind optsize readonly uwtable
+define linkonce_odr zeroext i8 @IN6_IS_ADDR_LINKLOCAL(i8* nocapture readonly) local_unnamed_addr {
+  %2 = bitcast i8* %0 to i32*
+  %3 = load i32, i32* %2, align 4
+  %4 = tail call i32 @llvm.bswap.i32(i32 -4194304)
+  %5 = and i32 %4, %3
+  %6 = tail call i32 @llvm.bswap.i32(i32 -25165824)
+  %7 = icmp eq i32 %5, %6
+  %8 = zext i1 %7 to i8
+  ret i8 %8
+}
+
+; Function Attrs: nounwind optsize readonly uwtable
+define linkonce_odr zeroext i8 @IN6_IS_ADDR_SITELOCAL(i8* nocapture readonly) local_unnamed_addr {
+  %2 = bitcast i8* %0 to i32*
+  %3 = load i32, i32* %2, align 4
+  %4 = tail call i32 @llvm.bswap.i32(i32 -4194304)
+  %5 = and i32 %4, %3
+  %6 = tail call i32 @llvm.bswap.i32(i32 -20971520)
+  %7 = icmp eq i32 %5, %6
+  %8 = zext i1 %7 to i8
+  ret i8 %8
+}
+
+; Function Attrs: nounwind optsize readonly uwtable
+define linkonce_odr zeroext i8 @IN6_IS_ADDR_V4MAPPED(i8* nocapture readonly) local_unnamed_addr {
+  %2 = bitcast i8* %0 to i32*
+  %3 = load i32, i32* %2, align 4
+  %4 = icmp eq i32 %3, 0
+  br i1 %4, label %5, label %16
+
+; <label>:5:                                      ; preds = %1
+  %6 = getelementptr inbounds i8, i8* %0, i64 4
+  %7 = bitcast i8* %6 to i32*
+  %8 = load i32, i32* %7, align 4
+  %9 = icmp eq i32 %8, 0
+  br i1 %9, label %10, label %16
+
+; <label>:10:                                     ; preds = %5
+  %11 = getelementptr inbounds i8, i8* %0, i64 8
+  %12 = bitcast i8* %11 to i32*
+  %13 = load i32, i32* %12, align 4
+  %14 = tail call i32 @llvm.bswap.i32(i32 65535)
+  %15 = icmp eq i32 %13, %14
+  br label %16
+
+; <label>:16:                                     ; preds = %10, %5, %1
+  %17 = phi i1 [ false, %5 ], [ false, %1 ], [ %15, %10 ]
+  %18 = zext i1 %17 to i8
+  ret i8 %18
+}
+
+; Function Attrs: nounwind optsize readonly uwtable
+define linkonce_odr zeroext i8 @IN6_IS_ADDR_V4COMPAT(i8* nocapture readonly) local_unnamed_addr {
+  %2 = bitcast i8* %0 to i32*
+  %3 = load i32, i32* %2, align 4
+  %4 = icmp eq i32 %3, 0
+  br i1 %4, label %5, label %21
+
+; <label>:5:                                      ; preds = %1
+  %6 = getelementptr inbounds i8, i8* %0, i64 4
+  %7 = bitcast i8* %6 to i32*
+  %8 = load i32, i32* %7, align 4
+  %9 = icmp eq i32 %8, 0
+  br i1 %9, label %10, label %21
+
+; <label>:10:                                     ; preds = %5
+  %11 = getelementptr inbounds i8, i8* %0, i64 8
+  %12 = bitcast i8* %11 to i32*
+  %13 = load i32, i32* %12, align 4
+  %14 = icmp eq i32 %13, 0
+  br i1 %14, label %15, label %21
+
+; <label>:15:                                     ; preds = %10
+  %16 = getelementptr inbounds i8, i8* %0, i64 12
+  %17 = bitcast i8* %16 to i32*
+  %18 = load i32, i32* %17, align 4
+  %19 = tail call i32 @llvm.bswap.i32(i32 %18)
+  %20 = icmp ugt i32 %19, 1
+  br label %21
+
+; <label>:21:                                     ; preds = %15, %10, %5, %1
+  %22 = phi i1 [ false, %10 ], [ false, %5 ], [ false, %1 ], [ %20, %15 ]
+  %23 = zext i1 %22 to i8
+  ret i8 %23
+}
+
+; Function Attrs: norecurse nounwind optsize readonly uwtable
+define linkonce_odr zeroext i8 @IN6_ARE_ADDR_EQUAL(i8* nocapture readonly, i8* nocapture readonly) local_unnamed_addr {
+  %3 = bitcast i8* %0 to i32*
+  %4 = load i32, i32* %3, align 4
+  %5 = bitcast i8* %1 to i32*
+  %6 = load i32, i32* %5, align 4
+  %7 = icmp eq i32 %4, %6
+  br i1 %7, label %8, label %32
+
+; <label>:8:                                      ; preds = %2
+  %9 = getelementptr inbounds i8, i8* %0, i64 4
+  %10 = bitcast i8* %9 to i32*
+  %11 = load i32, i32* %10, align 4
+  %12 = getelementptr inbounds i8, i8* %1, i64 4
+  %13 = bitcast i8* %12 to i32*
+  %14 = load i32, i32* %13, align 4
+  %15 = icmp eq i32 %11, %14
+  br i1 %15, label %16, label %32
+
+; <label>:16:                                     ; preds = %8
+  %17 = getelementptr inbounds i8, i8* %0, i64 8
+  %18 = bitcast i8* %17 to i32*
+  %19 = load i32, i32* %18, align 4
+  %20 = getelementptr inbounds i8, i8* %1, i64 8
+  %21 = bitcast i8* %20 to i32*
+  %22 = load i32, i32* %21, align 4
+  %23 = icmp eq i32 %19, %22
+  br i1 %23, label %24, label %32
+
+; <label>:24:                                     ; preds = %16
+  %25 = getelementptr inbounds i8, i8* %0, i64 12
+  %26 = bitcast i8* %25 to i32*
+  %27 = load i32, i32* %26, align 4
+  %28 = getelementptr inbounds i8, i8* %1, i64 12
+  %29 = bitcast i8* %28 to i32*
+  %30 = load i32, i32* %29, align 4
+  %31 = icmp eq i32 %27, %30
+  br label %32
+
+; <label>:32:                                     ; preds = %24, %16, %8, %2
+  %33 = phi i1 [ false, %16 ], [ false, %8 ], [ false, %2 ], [ %31, %24 ]
+  %34 = zext i1 %33 to i8
+  ret i8 %34
+}
diff --git a/nlvm-lib/nlvmbase-arm64-MacOSX.ll b/nlvm-lib/nlvmbase-arm64-MacOSX.ll
new file mode 100644
index 0000000..2d7f2fd
--- /dev/null
+++ b/nlvm-lib/nlvmbase-arm64-MacOSX.ll
@@ -0,0 +1,708 @@
+; Workarounds for:
+; * bugs in nlvm
+; * nim standard library including macros from header files
+; * stuff in nimbase.h
+; For this to go away, one would have to patch upstream to
+; avoid depending on c headers in the stdlib, and fix some bugs
+; in nlvm
+
+target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
+target triple = "aarch64-unknown-macos"
+
+; ioctls.h
+@FIONCLEX = linkonce_odr constant i32 21584
+@FIOCLEX = linkonce_odr constant i32 21585
+
+; pthreads.h
+@PTHREAD_MUTEX_RECURSIVE = linkonce_odr constant i32 1
+
+; signal.h
+@SIG_ERR = global void (i32)* inttoptr (i32 -1 to void (i32)*), align 8
+@SIG_DFL = global void (i32)* inttoptr (i32 0 to void (i32)*), align 8
+@SIG_IGN = global void (i32)* inttoptr (i32 1 to void (i32)*), align 8
+@SEGV_MAPERR = linkonce_odr constant i32 1
+@SIGEV_NONE = linkonce_odr constant i32 1
+@SIGEV_SIGNAL = linkonce_odr constant i32 2
+@SIGEV_THREAD = linkonce_odr constant i32 3
+@SIGABRT = linkonce_odr constant i32 6
+@SIGALRM = linkonce_odr constant i32 14
+@SIGBUS = linkonce_odr constant i32 10
+@SIGCHLD = linkonce_odr constant i32 20
+@SIGCONT = linkonce_odr constant i32 19
+@SIGFPE = linkonce_odr constant i32 8
+@SIGHUP = linkonce_odr constant i32 1
+@SIGILL = linkonce_odr constant i32 4
+@SIGINT = linkonce_odr constant i32 2
+@SIGKILL = linkonce_odr constant i32 9
+@SIGPIPE = linkonce_odr constant i32 13
+@SIGQUIT = linkonce_odr constant i32 3
+@SIGSEGV = linkonce_odr constant i32 11
+@SIGSTOP = linkonce_odr constant i32 17
+@SIGTERM = linkonce_odr constant i32 15
+@SIGTSTP = linkonce_odr constant i32 18
+@SIGTTIN = linkonce_odr constant i32 21
+@SIGTTOU = linkonce_odr constant i32 22
+@SIGUSR1 = linkonce_odr constant i32 30
+@SIGUSR2 = linkonce_odr constant i32 31
+@SIGPOLL = linkonce_odr constant i32 23
+@SIGPROF = linkonce_odr constant i32 27
+@SIGSYS = linkonce_odr constant i32 12
+@SIGTRAP = linkonce_odr constant i32 5
+@SIGURG = linkonce_odr constant i32 16
+@SIGVTALRM = linkonce_odr constant i32 26
+@SIGXCPU = linkonce_odr constant i32 24
+@SIGXFSZ = linkonce_odr constant i32 25
+@SA_NOCLDSTOP = linkonce_odr constant i32 1
+@SIG_BLOCK = linkonce_odr constant i32 1
+@SIG_UNBLOCK = linkonce_odr constant i32 2
+@SIG_SETMASK = linkonce_odr constant i32 0
+@SS_ONSTACK = linkonce_odr constant i32 1
+@SS_DISABLE = linkonce_odr constant i32 2
+@MINSIGSTKSZ = linkonce_odr constant i32 2048
+@SIGSTKSZ = linkonce_odr constant i32 8192
+
+; errno.h
+@EACCES = linkonce_odr constant i32 13
+@EADDRINUSE = linkonce_odr constant i32 48
+@EADDRNOTAVAIL = linkonce_odr constant i32 49
+@EAFNOSUPPORT = linkonce_odr constant i32 47
+@EAGAIN = linkonce_odr constant i32 35
+@EALREADY = linkonce_odr constant i32 37
+@EBADF = linkonce_odr constant i32 9
+@EBADMSG = linkonce_odr constant i32 94
+@EBUSY = linkonce_odr constant i32 16
+@ECANCELED = linkonce_odr constant i32 89
+@ECHILD = linkonce_odr constant i32 10
+@ECONNABORTED = linkonce_odr constant i32 53
+@ECONNREFUSED = linkonce_odr constant i32 61
+@ECONNRESET = linkonce_odr constant i32 54
+@EDEADLK = linkonce_odr constant i32 11
+@EDESTADDRREQ = linkonce_odr constant i32 39
+@EDOM = linkonce_odr constant i32 33
+@EDQUOT = linkonce_odr constant i32 69
+@EEXIST = linkonce_odr constant i32 17
+@EFAULT = linkonce_odr constant i32 14
+@EFBIG = linkonce_odr constant i32 27
+@EHOSTUNREACH = linkonce_odr constant i32 65
+@EIDRM = linkonce_odr constant i32 90
+@EILSEQ = linkonce_odr constant i32 92
+@EINPROGRESS = linkonce_odr constant i32 36
+@EINTR = linkonce_odr constant i32 4
+@EINVAL = linkonce_odr constant i32 22
+@EIO = linkonce_odr constant i32 5
+@EISCONN = linkonce_odr constant i32 56
+@EISDIR = linkonce_odr constant i32 21
+@ELOOP = linkonce_odr constant i32 62
+@EMFILE = linkonce_odr constant i32 24
+@EMLINK = linkonce_odr constant i32 31
+@EMSGSIZE = linkonce_odr constant i32 40
+@EMULTIHOP = linkonce_odr constant i32 95
+@ENAMETOOLONG = linkonce_odr constant i32 63
+@ENETDOWN = linkonce_odr constant i32 50
+@ENETRESET = linkonce_odr constant i32 52
+@ENETUNREACH = linkonce_odr constant i32 51
+@ENFILE = linkonce_odr constant i32 23
+@ENOBUFS = linkonce_odr constant i32 55
+@ENODATA = linkonce_odr constant i32 96
+@ENODEV = linkonce_odr constant i32 19
+@ENOENT = linkonce_odr constant i32 2
+@ENOEXEC = linkonce_odr constant i32 8
+@ENOLCK = linkonce_odr constant i32 77
+@ENOLINK = linkonce_odr constant i32 97
+@ENOMEM = linkonce_odr constant i32 12
+@ENOMSG = linkonce_odr constant i32 91
+@ENOPROTOOPT = linkonce_odr constant i32 42
+@ENOSPC = linkonce_odr constant i32 28
+@ENOSR = linkonce_odr constant i32 98
+@ENOSTR = linkonce_odr constant i32 99
+@ENOSYS = linkonce_odr constant i32 78
+@ENOTCONN = linkonce_odr constant i32 57
+@ENOTDIR = linkonce_odr constant i32 20
+@ENOTEMPTY = linkonce_odr constant i32 66
+@ENOTSOCK = linkonce_odr constant i32 38
+@ENOTSUP = linkonce_odr constant i32 45
+@ENOTTY = linkonce_odr constant i32 25
+@ENXIO = linkonce_odr constant i32 6
+@EOPNOTSUPP = linkonce_odr constant i32 102
+@EOVERFLOW = linkonce_odr constant i32 84
+@EPERM = linkonce_odr constant i32 1
+@EPIPE = linkonce_odr constant i32 32
+@EPROTO = linkonce_odr constant i32 100
+@EPROTONOSUPPORT = linkonce_odr constant i32 43
+@EPROTOTYPE = linkonce_odr constant i32 41
+@ERANGE = linkonce_odr constant i32 34
+@EROFS = linkonce_odr constant i32 30
+@ESPIPE = linkonce_odr constant i32 29
+@ESRCH = linkonce_odr constant i32 3
+@ESTALE = linkonce_odr constant i32 70
+@ETIME = linkonce_odr constant i32 101
+@ETIMEDOUT = linkonce_odr constant i32 60
+@ETXTBSY = linkonce_odr constant i32 26
+@EWOULDBLOCK = linkonce_odr constant i32 35
+@EXDEV = linkonce_odr constant i32 18
+
+; spawn.h
+@POSIX_SPAWN_RESETIDS = linkonce_odr constant i32 1
+@POSIX_SPAWN_SETPGROUP = linkonce_odr constant i32 2
+@POSIX_SPAWN_SETSCHEDPARAM = linkonce_odr constant i32 16
+@POSIX_SPAWN_SETSCHEDULER = linkonce_odr constant i32 32
+@POSIX_SPAWN_SETSIGDEF = linkonce_odr constant i32 4
+@POSIX_SPAWN_SETSIGMASK = linkonce_odr constant i32 8
+@POSIX_SPAWN_USEVFORK = linkonce_odr constant i32 64
+
+; sys/stat.h
+@S_IFBLK = linkonce_odr constant i32 24576
+@S_IFCHR = linkonce_odr constant i32 8192
+@S_IFDIR = linkonce_odr constant i32 16384
+@S_IFIFO = linkonce_odr constant i32 4096
+@S_IFLNK = linkonce_odr constant i32 40960
+@S_IFMT = linkonce_odr constant i32 61440
+@S_IFREG = linkonce_odr constant i32 32768
+@S_IFSOCK = linkonce_odr constant i32 49152
+@S_IRGRP = linkonce_odr constant i32 32
+@S_IROTH = linkonce_odr constant i32 4
+@S_IRUSR = linkonce_odr constant i32 256
+@S_IRWXG = linkonce_odr constant i32 56
+@S_IRWXO = linkonce_odr constant i32 7
+@S_IRWXU = linkonce_odr constant i32 448
+@S_ISGID = linkonce_odr constant i32 1024
+@S_ISUID = linkonce_odr constant i32 2048
+@S_ISVTX = linkonce_odr constant i32 512
+@S_IWGRP = linkonce_odr constant i32 16
+@S_IWOTH = linkonce_odr constant i32 2
+@S_IWUSR = linkonce_odr constant i32 128
+@S_IXGRP = linkonce_odr constant i32 8
+@S_IXOTH = linkonce_odr constant i32 1
+@S_IXUSR = linkonce_odr constant i32 64 
+
+; stdio.h
+@_IOFBF = linkonce_odr constant i32 0
+@_IOLBF = linkonce_odr constant i32 1
+@_IONBF = linkonce_odr constant i32 2
+@L_ctermid = linkonce_odr constant i32 9
+
+; syscall.h
+@SYS_getrandom = linkonce_odr constant i32 318
+
+; sys/ioctl.h
+@TIOCGWINSZ = linkonce_odr constant i32 21523
+
+; time.h
+@CLOCK_REALTIME = linkonce_odr constant i32 0
+@CLOCKS_PER_SEC = linkonce_odr constant i64 1000000
+
+; termios.h
+@VINTR = linkonce_odr constant i32 0
+@VQUIT = linkonce_odr constant i32 1
+@VERASE = linkonce_odr constant i32 2
+@VKILL = linkonce_odr constant i32 3
+@VEOF = linkonce_odr constant i32 4
+@VTIME = linkonce_odr constant i32 5
+@VMIN = linkonce_odr constant i32 6
+@VSTART = linkonce_odr constant i32 8
+@VSTOP = linkonce_odr constant i32 9
+@VSUSP = linkonce_odr constant i32 10
+@VEOL = linkonce_odr constant i32 11
+@IGNBRK = linkonce_odr constant i32 1
+@BRKINT = linkonce_odr constant i32 2
+@IGNPAR = linkonce_odr constant i32 4
+@PARMRK = linkonce_odr constant i32 8
+@INPCK = linkonce_odr constant i32 16
+@ISTRIP = linkonce_odr constant i32 32
+@INLCR = linkonce_odr constant i32 64
+@IGNCR = linkonce_odr constant i32 128
+@ICRNL = linkonce_odr constant i32 256
+@IUCLC = linkonce_odr constant i32 512
+@IXON = linkonce_odr constant i32 1024
+@IXANY = linkonce_odr constant i32 2048
+@IXOFF = linkonce_odr constant i32 4096
+@OPOST = linkonce_odr constant i32 1
+@ONLCR = linkonce_odr constant i32 4
+@OCRNL = linkonce_odr constant i32 8
+@ONOCR = linkonce_odr constant i32 16
+@ONLRET = linkonce_odr constant i32 32
+@OFILL = linkonce_odr constant i32 64
+@OFDEL = linkonce_odr constant i32 128
+@NLDLY = linkonce_odr constant i32 256
+@NL0 = linkonce_odr constant i32 0
+@NL1 = linkonce_odr constant i32 256
+@CRDLY = linkonce_odr constant i32 1536
+@CR0 = linkonce_odr constant i32 0
+@CR1 = linkonce_odr constant i32 512
+@CR2 = linkonce_odr constant i32 1024
+@CR3 = linkonce_odr constant i32 1536
+@TABDLY = linkonce_odr constant i32 6144
+@TAB0 = linkonce_odr constant i32 0
+@TAB1 = linkonce_odr constant i32 2048
+@TAB2 = linkonce_odr constant i32 4096
+@TAB3 = linkonce_odr constant i32 6144
+@BSDLY = linkonce_odr constant i32 8192
+@BS0 = linkonce_odr constant i32 0
+@BS1 = linkonce_odr constant i32 8192
+@FFDLY = linkonce_odr constant i32 32768
+@FF0 = linkonce_odr constant i32 0
+@FF1 = linkonce_odr constant i32 32768
+@VTDLY = linkonce_odr constant i32 16384
+@VT0 = linkonce_odr constant i32 0
+@VT1 = linkonce_odr constant i32 16384
+@B0 = linkonce_odr constant i32 0
+@B50 = linkonce_odr constant i32 1
+@B75 = linkonce_odr constant i32 2
+@B110 = linkonce_odr constant i32 3
+@B134 = linkonce_odr constant i32 4
+@B150 = linkonce_odr constant i32 5
+@B200 = linkonce_odr constant i32 6
+@B300 = linkonce_odr constant i32 7
+@B600 = linkonce_odr constant i32 8
+@B1200 = linkonce_odr constant i32 9
+@B1800 = linkonce_odr constant i32 10
+@B2400 = linkonce_odr constant i32 11
+@B4800 = linkonce_odr constant i32 12
+@B9600 = linkonce_odr constant i32 13
+@B19200 = linkonce_odr constant i32 14
+@B38400 = linkonce_odr constant i32 15
+@EXTA = linkonce_odr constant i32 14
+@EXTB = linkonce_odr constant i32 15
+@CSIZE = linkonce_odr constant i32 48
+@CS5 = linkonce_odr constant i32 0
+@CS6 = linkonce_odr constant i32 16
+@CS7 = linkonce_odr constant i32 32
+@CS8 = linkonce_odr constant i32 48
+@CSTOPB = linkonce_odr constant i32 64
+@CREAD = linkonce_odr constant i32 128
+@PARENB = linkonce_odr constant i32 256
+@PARODD = linkonce_odr constant i32 512
+@HUPCL = linkonce_odr constant i32 1024
+@CLOCAL = linkonce_odr constant i32 2048
+@ISIG = linkonce_odr constant i32 1
+@ICANON = linkonce_odr constant i32 2
+@ECHO = linkonce_odr constant i32 8
+@ECHOE = linkonce_odr constant i32 16
+@ECHOK = linkonce_odr constant i32 32
+@ECHONL = linkonce_odr constant i32 64
+@NOFLSH = linkonce_odr constant i32 128
+@TOSTOP = linkonce_odr constant i32 256
+@IEXTEN = linkonce_odr constant i32 32768
+@TCOOFF = linkonce_odr constant i32 0
+@TCOON = linkonce_odr constant i32 1
+@TCIOFF = linkonce_odr constant i32 2
+@TCION = linkonce_odr constant i32 3
+@TCIFLUSH = linkonce_odr constant i32 0
+@TCOFLUSH = linkonce_odr constant i32 1
+@TCIOFLUSH = linkonce_odr constant i32 2
+@TCSANOW = linkonce_odr constant i32 0
+@TCSADRAIN = linkonce_odr constant i32 1
+@TCSAFLUSH = linkonce_odr constant i32 2
+
+; fcntl.h
+@F_GETFD = linkonce_odr constant i32 1
+@F_SETFD = linkonce_odr constant i32 2
+@FD_CLOEXEC = linkonce_odr constant i32 1
+
+; sys/wait.h
+@WNOHANG = linkonce_odr constant i32 1
+@WUNTRACED = linkonce_odr constant i32 2
+@WEXITED = linkonce_odr constant i32 4
+@WSTOPPED = linkonce_odr constant i32 2
+@WCONTINUED = linkonce_odr constant i32 8
+@WNOWAIT = linkonce_odr constant i32 16777216
+
+; copyfile.h
+@COPYFILE_ACL	= linkonce_odr constant i32 1
+@COPYFILE_STAT = linkonce_odr constant i32 2
+@COPYFILE_XATTR	= linkonce_odr constant i32 4
+@COPYFILE_DATA = linkonce_odr constant i32 8
+
+; sys/wait.h
+; proc WEXITSTATUS*(s: cint): cint =  (s and 0xff00) shr 8
+; proc WTERMSIG*(s:cint): cint = s and 0x7f
+; proc WSTOPSIG*(s:cint): cint = WEXITSTATUS(s)
+; proc WIFEXITED*(s:cint) : bool = WTERMSIG(s) == 0
+; proc WIFSIGNALED*(s:cint) : bool = (cast[int8]((s and 0x7f) + 1) shr 1) > 0
+; proc WIFSTOPPED*(s:cint) : bool = (s and 0xff) == 0x7f
+; proc WIFCONTINUED*(s:cint) : bool = s == WCONTINUED
+
+define linkonce_odr i32 @WEXITSTATUS(i32 %m) {
+  %1 = and i32 %m, 65280
+  %2 = ashr i32 %1, 8
+  ret i32 %2
+}
+
+define linkonce_odr i32 @WTERMSIG(i32 %m) {
+  %1 = and i32 %m, 127
+  ret i32 %1
+}
+
+; unistd.h
+define linkonce_odr i8 @S_ISDIR(i32 %m) {
+  %1 = and i32 %m, 61440
+  %2 = icmp eq i32 %1, 16384
+  %3 = zext i1 %2 to i8
+  ret i8 %3
+}
+define linkonce_odr i8 @S_ISCHR(i32 %m) {
+  %1 = and i32 %m, 61440
+  %2 = icmp eq i32 %1, 8192
+  %3 = zext i1 %2 to i8
+  ret i8 %3
+}
+define linkonce_odr i8 @S_ISBLK(i32 %m) {
+  %1 = and i32 %m, 61440
+  %2 = icmp eq i32 %1, 24576
+  %3 = zext i1 %2 to i8
+  ret i8 %3
+}
+define linkonce_odr i8 @S_ISREG(i32 %m) {
+  %1 = and i32 %m, 61440
+  %2 = icmp eq i32 %1, 32768
+  %3 = zext i1 %2 to i8
+  ret i8 %3
+}
+define linkonce_odr i8 @S_ISFIFO(i32 %m) {
+  %1 = and i32 %m, 61440
+  %2 = icmp eq i32 %1, 4096
+  %3 = zext i1 %2 to i8
+  ret i8 %3
+}
+define linkonce_odr i8 @S_ISLNK(i32 %m) {
+  %1 = and i32 %m, 61440
+  %2 = icmp eq i32 %1, 40960
+  %3 = zext i1 %2 to i8
+  ret i8 %3
+}
+define linkonce_odr i8 @S_ISSOCK(i32 %m) {
+  %1 = and i32 %m, 61440
+  %2 = icmp eq i32 %1, 49152
+  %3 = zext i1 %2 to i8
+  ret i8 %3
+}
+; sys/select.h
+%fd_set = type { [16 x i64] }
+
+define linkonce_odr void @FD_ZERO(%fd_set* %0) {
+  %2 = alloca %fd_set*, align 8
+  %3 = alloca i32, align 4
+  %4 = alloca %fd_set*, align 8
+  store %fd_set* %0, %fd_set** %2, align 8
+  br label %5
+
+5:                                                ; preds = %1
+  %6 = load %fd_set*, %fd_set** %2, align 8
+  store %fd_set* %6, %fd_set** %4, align 8
+  store i32 0, i32* %3, align 4
+  br label %7
+
+7:                                                ; preds = %17, %5
+  %8 = load i32, i32* %3, align 4
+  %9 = zext i32 %8 to i64
+  %10 = icmp ult i64 %9, 16
+  br i1 %10, label %11, label %20
+
+11:                                               ; preds = %7
+  %12 = load %fd_set*, %fd_set** %4, align 8
+  %13 = getelementptr inbounds %fd_set, %fd_set* %12, i32 0, i32 0
+  %14 = load i32, i32* %3, align 4
+  %15 = zext i32 %14 to i64
+  %16 = getelementptr inbounds [16 x i64], [16 x i64]* %13, i64 0, i64 %15
+  store i64 0, i64* %16, align 8
+  br label %17
+
+17:                                               ; preds = %11
+  %18 = load i32, i32* %3, align 4
+  %19 = add i32 %18, 1
+  store i32 %19, i32* %3, align 4
+  br label %7
+
+20:                                               ; preds = %7
+  br label %21
+
+21:                                               ; preds = %20
+  ret void
+}
+
+define linkonce_odr void @FD_SET(i32 %0, %fd_set* %1) {
+  %3 = alloca i32, align 4
+  %4 = alloca %fd_set*, align 8
+  store i32 %0, i32* %3, align 4
+  store %fd_set* %1, %fd_set** %4, align 8
+  %5 = load i32, i32* %3, align 4
+  %6 = srem i32 %5, 64
+  %7 = zext i32 %6 to i64
+  %8 = shl i64 1, %7
+  %9 = load %fd_set*, %fd_set** %4, align 8
+  %10 = getelementptr inbounds %fd_set, %fd_set* %9, i32 0, i32 0
+  %11 = load i32, i32* %3, align 4
+  %12 = sdiv i32 %11, 64
+  %13 = sext i32 %12 to i64
+  %14 = getelementptr inbounds [16 x i64], [16 x i64]* %10, i64 0, i64 %13
+  %15 = load i64, i64* %14, align 8
+  %16 = or i64 %15, %8
+  store i64 %16, i64* %14, align 8
+  ret void
+}
+
+define linkonce_odr i32 @FD_ISSET(i32 %0, %fd_set* %1) {
+  %3 = alloca i32, align 4
+  %4 = alloca %fd_set*, align 8
+  store i32 %0, i32* %3, align 4
+  store %fd_set* %1, %fd_set** %4, align 8
+  %5 = load %fd_set*, %fd_set** %4, align 8
+  %6 = getelementptr inbounds %fd_set, %fd_set* %5, i32 0, i32 0
+  %7 = load i32, i32* %3, align 4
+  %8 = sdiv i32 %7, 64
+  %9 = sext i32 %8 to i64
+  %10 = getelementptr inbounds [16 x i64], [16 x i64]* %6, i64 0, i64 %9
+  %11 = load i64, i64* %10, align 8
+  %12 = load i32, i32* %3, align 4
+  %13 = srem i32 %12, 64
+  %14 = zext i32 %13 to i64
+  %15 = shl i64 1, %14
+  %16 = and i64 %11, %15
+  %17 = icmp ne i64 %16, 0
+  %18 = zext i1 %17 to i32
+  ret i32 %18
+}
+
+define linkonce_odr i8 @WIFEXITED(i32 %m) {
+  %1 = and i32 %m, 127
+  %2 = icmp eq i32 %1, 0
+  %3 = zext i1 %2 to i8
+  ret i8 %3
+}
+
+define linkonce_odr i8 @WIFSIGNALED(i32 %m) {
+  %1 = shl i32 %m, 24
+  %2 = and i32 %1, 2130706432
+  %3 = add nuw i32 %2, 16777216
+  %4 = ashr i32 %3, 25
+  %5 = icmp sgt i32 %4, 0
+  %6 = zext i1 %5 to i8
+  ret i8 %6
+}
+; nimbase.h
+
+declare void @llvm.memset.p0i8.i64(i8*, i8, i64, i32, i1)
+
+define linkonce_odr void @zeroMem(i8* %p, i64 %s) {
+  call void @llvm.memset.p0i8.i64(i8* %p, i8 0, i64 %s, i32 0, i1 false)
+  ret void
+}
+
+declare i32 @memcmp(i8*, i8*, i64)
+
+define linkonce_odr i8 @equalMem(i8* %a, i8* %b, i64 %l) {
+  %1 = call i32 @memcmp(i8* %a, i8* %b, i64 %l)
+  %2 = icmp eq i32 %1, 0
+  %3 = zext i1 %2 to i8
+  ret i8 %3
+}
+
+define linkonce_odr i1 @likely(i1 %a) {
+  ret i1 %a
+}
+
+define linkonce_odr i1 @unlikely(i1 %a) {
+  ret i1 %a
+}
+
+declare i32 @llvm.bswap.i32(i32)
+
+define linkonce_odr zeroext i8 @IN6_IS_ADDR_UNSPECIFIED(i8* nocapture readonly) local_unnamed_addr {
+  %2 = bitcast i8* %0 to i32*
+  %3 = load i32, i32* %2, align 4
+  %4 = icmp eq i32 %3, 0
+  br i1 %4, label %5, label %20
+
+; <label>:5:                                      ; preds = %1
+  %6 = getelementptr inbounds i8, i8* %0, i64 4
+  %7 = bitcast i8* %6 to i32*
+  %8 = load i32, i32* %7, align 4
+  %9 = icmp eq i32 %8, 0
+  br i1 %9, label %10, label %20
+
+; <label>:10:                                     ; preds = %5
+  %11 = getelementptr inbounds i8, i8* %0, i64 8
+  %12 = bitcast i8* %11 to i32*
+  %13 = load i32, i32* %12, align 4
+  %14 = icmp eq i32 %13, 0
+  br i1 %14, label %15, label %20
+
+; <label>:15:                                     ; preds = %10
+  %16 = getelementptr inbounds i8, i8* %0, i64 12
+  %17 = bitcast i8* %16 to i32*
+  %18 = load i32, i32* %17, align 4
+  %19 = icmp eq i32 %18, 0
+  br label %20
+
+; <label>:20:                                     ; preds = %15, %10, %5, %1
+  %21 = phi i1 [ false, %10 ], [ false, %5 ], [ false, %1 ], [ %19, %15 ]
+  %22 = zext i1 %21 to i8
+  ret i8 %22
+}
+
+; Function Attrs: nounwind optsize readonly uwtable
+define linkonce_odr zeroext i8 @IN6_IS_ADDR_LOOPBACK(i8* nocapture readonly) local_unnamed_addr {
+  %2 = bitcast i8* %0 to i32*
+  %3 = load i32, i32* %2, align 4
+  %4 = icmp eq i32 %3, 0
+  br i1 %4, label %5, label %21
+
+; <label>:5:                                      ; preds = %1
+  %6 = getelementptr inbounds i8, i8* %0, i64 4
+  %7 = bitcast i8* %6 to i32*
+  %8 = load i32, i32* %7, align 4
+  %9 = icmp eq i32 %8, 0
+  br i1 %9, label %10, label %21
+
+; <label>:10:                                     ; preds = %5
+  %11 = getelementptr inbounds i8, i8* %0, i64 8
+  %12 = bitcast i8* %11 to i32*
+  %13 = load i32, i32* %12, align 4
+  %14 = icmp eq i32 %13, 0
+  br i1 %14, label %15, label %21
+
+; <label>:15:                                     ; preds = %10
+  %16 = getelementptr inbounds i8, i8* %0, i64 12
+  %17 = bitcast i8* %16 to i32*
+  %18 = load i32, i32* %17, align 4
+  %19 = tail call i32 @llvm.bswap.i32(i32 1)
+  %20 = icmp eq i32 %18, %19
+  br label %21
+
+; <label>:21:                                     ; preds = %15, %10, %5, %1
+  %22 = phi i1 [ false, %10 ], [ false, %5 ], [ false, %1 ], [ %20, %15 ]
+  %23 = zext i1 %22 to i8
+  ret i8 %23
+}
+
+; Function Attrs: nounwind optsize readonly uwtable
+define linkonce_odr zeroext i8 @IN6_IS_ADDR_LINKLOCAL(i8* nocapture readonly) local_unnamed_addr {
+  %2 = bitcast i8* %0 to i32*
+  %3 = load i32, i32* %2, align 4
+  %4 = tail call i32 @llvm.bswap.i32(i32 -4194304)
+  %5 = and i32 %4, %3
+  %6 = tail call i32 @llvm.bswap.i32(i32 -25165824)
+  %7 = icmp eq i32 %5, %6
+  %8 = zext i1 %7 to i8
+  ret i8 %8
+}
+
+; Function Attrs: nounwind optsize readonly uwtable
+define linkonce_odr zeroext i8 @IN6_IS_ADDR_SITELOCAL(i8* nocapture readonly) local_unnamed_addr {
+  %2 = bitcast i8* %0 to i32*
+  %3 = load i32, i32* %2, align 4
+  %4 = tail call i32 @llvm.bswap.i32(i32 -4194304)
+  %5 = and i32 %4, %3
+  %6 = tail call i32 @llvm.bswap.i32(i32 -20971520)
+  %7 = icmp eq i32 %5, %6
+  %8 = zext i1 %7 to i8
+  ret i8 %8
+}
+
+; Function Attrs: nounwind optsize readonly uwtable
+define linkonce_odr zeroext i8 @IN6_IS_ADDR_V4MAPPED(i8* nocapture readonly) local_unnamed_addr {
+  %2 = bitcast i8* %0 to i32*
+  %3 = load i32, i32* %2, align 4
+  %4 = icmp eq i32 %3, 0
+  br i1 %4, label %5, label %16
+
+; <label>:5:                                      ; preds = %1
+  %6 = getelementptr inbounds i8, i8* %0, i64 4
+  %7 = bitcast i8* %6 to i32*
+  %8 = load i32, i32* %7, align 4
+  %9 = icmp eq i32 %8, 0
+  br i1 %9, label %10, label %16
+
+; <label>:10:                                     ; preds = %5
+  %11 = getelementptr inbounds i8, i8* %0, i64 8
+  %12 = bitcast i8* %11 to i32*
+  %13 = load i32, i32* %12, align 4
+  %14 = tail call i32 @llvm.bswap.i32(i32 65535)
+  %15 = icmp eq i32 %13, %14
+  br label %16
+
+; <label>:16:                                     ; preds = %10, %5, %1
+  %17 = phi i1 [ false, %5 ], [ false, %1 ], [ %15, %10 ]
+  %18 = zext i1 %17 to i8
+  ret i8 %18
+}
+
+; Function Attrs: nounwind optsize readonly uwtable
+define linkonce_odr zeroext i8 @IN6_IS_ADDR_V4COMPAT(i8* nocapture readonly) local_unnamed_addr {
+  %2 = bitcast i8* %0 to i32*
+  %3 = load i32, i32* %2, align 4
+  %4 = icmp eq i32 %3, 0
+  br i1 %4, label %5, label %21
+
+; <label>:5:                                      ; preds = %1
+  %6 = getelementptr inbounds i8, i8* %0, i64 4
+  %7 = bitcast i8* %6 to i32*
+  %8 = load i32, i32* %7, align 4
+  %9 = icmp eq i32 %8, 0
+  br i1 %9, label %10, label %21
+
+; <label>:10:                                     ; preds = %5
+  %11 = getelementptr inbounds i8, i8* %0, i64 8
+  %12 = bitcast i8* %11 to i32*
+  %13 = load i32, i32* %12, align 4
+  %14 = icmp eq i32 %13, 0
+  br i1 %14, label %15, label %21
+
+; <label>:15:                                     ; preds = %10
+  %16 = getelementptr inbounds i8, i8* %0, i64 12
+  %17 = bitcast i8* %16 to i32*
+  %18 = load i32, i32* %17, align 4
+  %19 = tail call i32 @llvm.bswap.i32(i32 %18)
+  %20 = icmp ugt i32 %19, 1
+  br label %21
+
+; <label>:21:                                     ; preds = %15, %10, %5, %1
+  %22 = phi i1 [ false, %10 ], [ false, %5 ], [ false, %1 ], [ %20, %15 ]
+  %23 = zext i1 %22 to i8
+  ret i8 %23
+}
+
+; Function Attrs: norecurse nounwind optsize readonly uwtable
+define linkonce_odr zeroext i8 @IN6_ARE_ADDR_EQUAL(i8* nocapture readonly, i8* nocapture readonly) local_unnamed_addr {
+  %3 = bitcast i8* %0 to i32*
+  %4 = load i32, i32* %3, align 4
+  %5 = bitcast i8* %1 to i32*
+  %6 = load i32, i32* %5, align 4
+  %7 = icmp eq i32 %4, %6
+  br i1 %7, label %8, label %32
+
+; <label>:8:                                      ; preds = %2
+  %9 = getelementptr inbounds i8, i8* %0, i64 4
+  %10 = bitcast i8* %9 to i32*
+  %11 = load i32, i32* %10, align 4
+  %12 = getelementptr inbounds i8, i8* %1, i64 4
+  %13 = bitcast i8* %12 to i32*
+  %14 = load i32, i32* %13, align 4
+  %15 = icmp eq i32 %11, %14
+  br i1 %15, label %16, label %32
+
+; <label>:16:                                     ; preds = %8
+  %17 = getelementptr inbounds i8, i8* %0, i64 8
+  %18 = bitcast i8* %17 to i32*
+  %19 = load i32, i32* %18, align 4
+  %20 = getelementptr inbounds i8, i8* %1, i64 8
+  %21 = bitcast i8* %20 to i32*
+  %22 = load i32, i32* %21, align 4
+  %23 = icmp eq i32 %19, %22
+  br i1 %23, label %24, label %32
+
+; <label>:24:                                     ; preds = %16
+  %25 = getelementptr inbounds i8, i8* %0, i64 12
+  %26 = bitcast i8* %25 to i32*
+  %27 = load i32, i32* %26, align 4
+  %28 = getelementptr inbounds i8, i8* %1, i64 12
+  %29 = bitcast i8* %28 to i32*
+  %30 = load i32, i32* %29, align 4
+  %31 = icmp eq i32 %27, %30
+  br label %32
+
+; <label>:32:                                     ; preds = %24, %16, %8, %2
+  %33 = phi i1 [ false, %16 ], [ false, %8 ], [ false, %2 ], [ %31, %24 ]
+  %34 = zext i1 %33 to i8
+  ret i8 %34
+}
diff --git a/nlvm/llgen.nim b/nlvm/llgen.nim
index ebc08b2..b5ac284 100644
--- a/nlvm/llgen.nim
+++ b/nlvm/llgen.nim
@@ -1254,7 +1254,7 @@ proc llMagicType(g: LLGen, name: string): llvm.TypeRef =
 
 proc llStringType(g: LLGen): llvm.TypeRef =
   if g.primitives[tyString] == nil:
-    g.primitives[tyString] = g.llMagicType("NimStringDesc").pointerType
+      g.primitives[tyString] = g.llMagicType("NimStringDesc").pointerType
   g.primitives[tyString]
 
 proc llGenericSeqType(g: LLGen): llvm.TypeRef =
@@ -2642,10 +2642,14 @@ proc callCtpop(g: LLGen, v: llvm.ValueRef, size: BiggestInt): llvm.ValueRef =
 
 proc callErrno(g: LLGen, prefix: string): llvm.ValueRef =
   # on linux errno is a function, so we call it here. not at all portable.
-
+  
   let
-    errnoType = llvm.functionType(g.cintType.pointerType(), [])
-    f = g.m.getOrInsertFunction("__" & prefix & "errno_location", errnoType)
+      errnoType = llvm.functionType(g.cintType.pointerType(), [])
+
+  when defined macosx:
+    let f = g.m.getOrInsertFunction("__" & prefix & "error", errnoType)
+  else:
+    let f = g.m.getOrInsertFunction("__" & prefix & "errno_location", errnoType)
 
   g.b.buildCall(f, [], g.nn(prefix & "errno"))
 
@@ -3148,6 +3152,9 @@ proc genFunctionWithBody(g: LLGen, s: PSym): LLValue =
     # dll:s
     result.v.setLinkage(llvm.InternalLinkage)
 
+  if s.name.s in ["nlvmEHPersonality"]:
+    result.v.setLinkage(llvm.ExternalLinkage) 
+
   let
     typ = s.typ.skipTypes(abstractInst)
     f = g.newLLFunc(result.v, s)
@@ -7457,7 +7464,7 @@ proc genForwardedProcs(g: LLGen) =
 
 proc myClose(graph: ModuleGraph, b: PPassContext, n: PNode): PNode =
   if graph.config.skipCodegen(n): return n
-
+  
   let pc = LLModule(b)
   let g = pc.g
   p("Close", n, 0)
diff --git a/nlvm/lllink.nim b/nlvm/lllink.nim
index 88f360d..12c4b9d 100644
--- a/nlvm/lllink.nim
+++ b/nlvm/lllink.nim
@@ -2,6 +2,7 @@ import
   os,
   osproc,
   strutils,
+  system/platforms,
 
   compiler/[
     extccomp,
@@ -13,6 +14,9 @@ import
   ],
   llvm/llvm
 
+const 
+  ToStrip = Whitespace + Newlines
+
 proc stripLinkOption(s: string): string =
   # TODO the gcc driver has multiple ways of passing stuff, and then there's the
   #      shell to contend with, with its quoting etc.. this needs a better
@@ -143,14 +147,135 @@ proc linkWasm32(conf: ConfigRef) =
     rawMessage(conf, errGenerated, "linking failed: '$1'" % (result))
     quit(1)
 
+proc linkMacOSXAmd64(conf: ConfigRef) =
+  # Ugly hack to reuse nim compiling of C files
+  conf.globalOptions.incl optNoLinking
+  callCCompiler(conf)
+  conf.globalOptions.excl optNoLinking
+
+  var args: seq[string]
+
+  args.add "ld64-lld"
+  args.add ["-arch", "x86_64"]
+
+  let currentPlatformVersion = execProcess("defaults read loginwindow SystemVersionStampAsString").strip(chars = ToStrip)
+  args.add ["-platform_version", "macos", currentPlatformVersion, "11.0"]
+  
+  # Add the macOS SDK linker search part so we can link libc
+  let sdkLibPath = execProcess("xcrun --sdk macosx --show-sdk-path")
+    .strip(chars = ToStrip ) & "/usr/lib"
+  args.add ["-L", sdkLibPath]
+  args.add "-lSystem"
+  args.add "-lc++"
+
+  let exeFile = conf.getOutFile(conf.outFile, platform.OS[conf.target.targetOS].exeExt)
+  args.add ["-o", exefile.string]
+
+  # We're going to load all standard library locations that clang uses, if possible
+  let libs =
+    try:
+      findLibraries(execProcess("clang -print-search-dirs"))
+    except:
+      @[]
+
+  for lib in libs:
+    args.add "-L" & lib
+
+  # Then the project object files...
+  for it in conf.externalToLink:
+    args.add addFileExt(it, CC[conf.cCompiler].objExt)
+
+  for x in conf.toCompile:
+    args.add x.obj.string
+
+  args.add stripLinkOption(parseCmdLine(conf.linkOptions))
+  args.add stripLinkOption(parseCmdLine(conf.linkOptionsCmd))
+
+  for linkedLib in items(conf.cLinkedLibs):
+    args.add CC[conf.cCompiler].linkLibCmd % linkedLib.quoteShell
+  for libDir in items(conf.cLibs):
+    args.add join([CC[conf.cCompiler].linkDirCmd, libDir.quoteShell])
+
+  rawMessage(conf, hintLinking, $args)
+
+  echo nimLLDLinkMachO(args)
+
+proc linkMacOSXArm64(conf: ConfigRef) =
+  # Ugly hack to reuse nim compiling of C files
+  conf.globalOptions.incl optNoLinking
+  callCCompiler(conf)
+  conf.globalOptions.excl optNoLinking
+
+  var args: seq[string]
+
+  args.add "ld64-lld"
+  args.add ["-arch", "arm64"]
+
+  let currentPlatformVersion = execProcess("defaults read loginwindow SystemVersionStampAsString").strip(chars = ToStrip)
+  args.add ["-platform_version", "macos", currentPlatformVersion, "11.0"]
+  
+  # Add the macOS SDK linker search part so we can link libc
+  let sdkLibPath = execProcess("xcrun --sdk macosx --show-sdk-path")
+    .strip(chars = ToStrip ) & "/usr/lib"
+  args.add ["-L", sdkLibPath]
+  args.add "-lSystem"
+
+  let exeFile = conf.getOutFile(conf.outFile, platform.OS[conf.target.targetOS].exeExt)
+  args.add ["-o", exefile.string]
+
+  # We're going to load all standard library locations that clang uses, if possible
+  let libs =
+    try:
+      findLibraries(execProcess("clang -print-search-dirs"))
+    except:
+      @[]
+
+  for lib in libs:
+    args.add "-L" & lib
+
+  # Then the project object files...
+  for it in conf.externalToLink:
+    args.add addFileExt(it, CC[conf.cCompiler].objExt)
+
+  for x in conf.toCompile:
+    args.add x.obj.string
+
+  args.add stripLinkOption(parseCmdLine(conf.linkOptions))
+  args.add stripLinkOption(parseCmdLine(conf.linkOptionsCmd))
+
+  for linkedLib in items(conf.cLinkedLibs):
+    args.add CC[conf.cCompiler].linkLibCmd % linkedLib.quoteShell
+  for libDir in items(conf.cLibs):
+    args.add join([CC[conf.cCompiler].linkDirCmd, libDir.quoteShell])
+
+  rawMessage(conf, hintLinking, $args)
+
+  echo nimLLDLinkMachO(args)
+
 proc lllink*(conf: ConfigRef) =
+  proc fallbackLink(conf: ConfigRef) =
+    # TODO configure this elsewhere? also, -Wl vs raw linker options..:/
+
+    if conf.target.targetOS == osMacosx:
+      discard
+      # conf.addLinkOptionCmd("--ld-path=" & LLDBinary)
+    else: 
+      conf.addLinkOptionCmd("-Wl,--as-needed")
+
+    callCCompiler(conf)
+
   if false and conf.target.targetOS == osLinux and conf.target.targetCPU == cpuAmd64:
     # TODO this stuff is not ready for prime time..
     linkLinuxAmd64(conf)
+
+  elif false and conf.target.targetOS == osMacosx:
+    if conf.target.targetCPU == cpuArm64:
+      linkMacOSXArm64(conf)
+    else:
+      linkMacOSXAmd64(conf)
+
   elif conf.target.targetCPU == cpuWasm32:
     linkWasm32(conf)
-  else:
-    # TODO configure this elsewhere? also, -Wl vs raw linker options..:/
-    conf.addLinkOptionCmd("-Wl,--as-needed")
 
-    callCCompiler(conf)
+  else:
+    fallbackLink(conf)    
diff --git a/nlvm/nim.cfg b/nlvm/nim.cfg
index f06dc6b..6c4ac9e 100644
--- a/nlvm/nim.cfg
+++ b/nlvm/nim.cfg
@@ -2,12 +2,15 @@ path:"../"
 path:"../Nim"
 path:"$lib"
 path:"$lib/packages/docutils"
+path:"../llvm"
 
 define:nimOldCaseObjects
 
 # for wrapper module, we need C++
-gcc.linkerexe:"g++"
-gcc.options.always:"-std=c++14"
+gcc.linkerexe="g++"
+gcc.options.always="-std=c++14"
+
+clang.linkerexe="clang++"
 
 passL:"-lpthread"
 
diff --git a/nlvm/nlvm.nim b/nlvm/nlvm.nim
index e7dbab3..3645045 100644
--- a/nlvm/nlvm.nim
+++ b/nlvm/nlvm.nim
@@ -276,6 +276,7 @@ proc handleCmdLine(cache: IdentCache, conf: ConfigRef) =
   var graph = newModuleGraph(cache, conf)
   if not self.loadConfigsAndProcessCmdLine(cache, conf, graph):
     return
+  
   mainCommand(graph)
 
   if conf.hasHint(hintGCStats): echo(GC_getStatistics())