From 0e085695efd8a602b6fb568f3e0df6e90d18baac Mon Sep 17 00:00:00 2001
From: Sam Estep <sam@samestep.com>
Date: Fri, 15 May 2026 09:14:57 -0400
Subject: [PATCH] python3Packages.libarcus: fix build for GCC 15

Assisted-by: Codex:gpt-5.5
---
 .../python-modules/libarcus/default.nix       |  3 +
 .../libarcus/gcc-15-cstdint.patch             | 86 +++++++++++++++++++
 2 files changed, 89 insertions(+)
 create mode 100644 pkgs/development/python-modules/libarcus/gcc-15-cstdint.patch

diff --git a/pkgs/development/python-modules/libarcus/default.nix b/pkgs/development/python-modules/libarcus/default.nix
index 7ce8701993619..7dc8568bcb1df 100644
--- a/pkgs/development/python-modules/libarcus/default.nix
+++ b/pkgs/development/python-modules/libarcus/default.nix
@@ -29,6 +29,9 @@ buildPythonPackage rec {
       url = "https://raw.githubusercontent.com/coryan/vcpkg/f69b85aa403b04e7d442c90db3418d484e44024f/ports/arcus/0001-fix-protobuf-deprecated.patch";
       sha256 = "0bqj7pxzpwsamknd6gadj419x6mwx8wnlfzg4zqn6cax3cmasjb2";
     })
+    # Fix build with GCC 15: https://github.com/Ultimaker/libArcus/pull/160
+    # That PR is on top of v5.3.0 which refactored things, so we must vendor it.
+    ./gcc-15-cstdint.patch
   ];
 
   propagatedBuildInputs = [
diff --git a/pkgs/development/python-modules/libarcus/gcc-15-cstdint.patch b/pkgs/development/python-modules/libarcus/gcc-15-cstdint.patch
new file mode 100644
index 0000000000000..eca274d42c3d3
--- /dev/null
+++ b/pkgs/development/python-modules/libarcus/gcc-15-cstdint.patch
@@ -0,0 +1,86 @@
+diff --git a/src/MessageTypeStore.cpp b/src/MessageTypeStore.cpp
+index 1d9b624..e9df3e0 100644
+--- a/src/MessageTypeStore.cpp
++++ b/src/MessageTypeStore.cpp
+@@ -17,6 +17,7 @@
+ 
+ #include "MessageTypeStore.h"
+ 
++#include <cstdint>
+ #include <unordered_map>
+ #include <sstream>
+ #include <iostream>
+diff --git a/src/MessageTypeStore.h b/src/MessageTypeStore.h
+index a0d4c08..d740681 100644
+--- a/src/MessageTypeStore.h
++++ b/src/MessageTypeStore.h
+@@ -20,6 +20,7 @@
+ #define ARCUS_MESSAGE_TYPE_STORE_H
+ 
+ #include <memory>
++#include <cstdint>
+ 
+ #include "ArcusExport.h"
+ #include "Types.h"
+diff --git a/src/PlatformSocket.cpp b/src/PlatformSocket.cpp
+index 4fa53bf..c3148a8 100644
+--- a/src/PlatformSocket.cpp
++++ b/src/PlatformSocket.cpp
+@@ -17,6 +17,8 @@
+  * along with this program. If not, see <http://www.gnu.org/licenses/>.
+  */
+ 
++#include <cstdint>
++
+ #include "PlatformSocket_p.h"
+ 
+ #ifdef _WIN32
+diff --git a/src/PlatformSocket_p.h b/src/PlatformSocket_p.h
+index e34a5e1..c95abe0 100644
+--- a/src/PlatformSocket_p.h
++++ b/src/PlatformSocket_p.h
+@@ -21,6 +21,7 @@
+ #define ARCUS_PLATFORM_SOCKET_P_H
+ 
+ #include <memory>
++#include <cstdint>
+ #include <string>
+ 
+ namespace Arcus
+diff --git a/src/Socket_p.h b/src/Socket_p.h
+index 09db6a8..f5761e8 100644
+--- a/src/Socket_p.h
++++ b/src/Socket_p.h
+@@ -17,6 +17,7 @@
+  * along with this program. If not, see <http://www.gnu.org/licenses/>.
+  */
+ 
++#include <cstdint>
+ #include <thread>
+ #include <mutex>
+ #include <string>
+diff --git a/src/Types.h b/src/Types.h
+index ef33f5d..527237c 100644
+--- a/src/Types.h
++++ b/src/Types.h
+@@ -19,6 +19,7 @@
+ #define ARCUS_TYPES_H
+ 
+ #include <string>
++#include <cstdint>
+ #include <memory>
+ 
+ namespace google
+diff --git a/src/WireMessage_p.h b/src/WireMessage_p.h
+index 3cf4594..319a6ac 100644
+--- a/src/WireMessage_p.h
++++ b/src/WireMessage_p.h
+@@ -20,6 +20,8 @@
+ #ifndef ARCUS_WIRE_MESSAGE_P_H
+ #define ARCUS_WIRE_MESSAGE_P_H
+ 
++#include <cstdint>
++
+ #include "Types.h"
+ 
+ namespace Arcus