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Add aarch64a_standalone baremetal runtime variant #230

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6 changes: 6 additions & 0 deletions qualcomm-software/embedded-multilib/json/multilib.json
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,12 @@
"json": "aarch64a.json",
"flags": "--target=aarch64-unknown-none-elf"
},
{
"variant": "aarch64a_standalone",
"json": "aarch64a_standalone.json",
"flags": "--target=aarch64-unknown-none-elf -fmultilib-flag=standalone",

@zhaoshiz Zhaoshi Zheng (zhaoshiz) Mar 4, 2026

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can you please explain what does this flag do?

@pzhengqc pzhengqc Mar 4, 2026

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This is a multilib custom flag (https://clang.llvm.org/docs/Multilib.html#multilib-custom-flags) used only for multilib selection. We have already added a few other custom flag to help with multilib selection for variants like shadow call stack, multi-threading, etc.

"libraries_supported": "musl-embedded"
},
{
"variant": "aarch64a_pacret",
"json": "aarch64a_pacret.json",
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27 changes: 27 additions & 0 deletions qualcomm-software/embedded-multilib/json/variants/aarch64a_standalone.json
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@@ -0,0 +1,27 @@
{
"args": {
"common": {
"TARGET_ARCH": "aarch64a",
"VARIANT": "aarch64a_standalone",
"COMPILE_FLAGS": "-march=armv8-a -fPIC",
"ENABLE_EXCEPTIONS": "OFF",
"ENABLE_RTTI": "OFF",
"TEST_EXECUTOR": "qemu",
"QEMU_MACHINE": "virt",
"QEMU_CPU": "cortex-a57",
"FLASH_ADDRESS": "0x40000000",
"FLASH_SIZE": "0x00400000",
"RAM_ADDRESS": "0x40400000",
"RAM_SIZE": "0x00200000",
"LIBRARY_BUILD_TYPE": "minsizerelease"
},
"musl-embedded": {
"ENABLE_CXX_LIBS": "ON",
"ENABLE_LIBC_TESTS": "OFF",
"ENABLE_COMPILER_RT_TESTS": "OFF",
"ENABLE_LIBCXX_TESTS": "OFF",
"EXTRA_MUSL-EMBEDDED_CONFIG_FLAGS": "--quic-libc-standalone",
"EXTRA_MUSL-EMBEDDED_CFLAGS": "-mstrict-align -D__QUIC_ENABLE_FLT_FOR_PRINT"
}
}
}
5 changes: 5 additions & 0 deletions qualcomm-software/embedded-multilib/multilib.yaml.in
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Expand Up @@ -45,6 +45,11 @@ Flags:
- Name: no-threads
- Name: threads
Default: threads
- Name: musl-subvariant
Values:
- Name: standalone
- Name: no-subvariant
Default: no-subvariant

# The list of library variants is substituted in by CMakeLists.txt, so
# that it can respect the LLVM_TOOLCHAIN_LIBRARY_VARIANTS setting and
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