[libc-commits] [libc] [libc][NFC] Workaround for environ_internal when building with gcc-12. (PR #196471)

[via libc-commits]

https://github.com/lntue created https://github.com/llvm/llvm-project/pull/196471

None

>From 0b36ca0690bbd270894732c0e1bb9d9fc9cd46f7 Mon Sep 17 00:00:00 2001
From: Tue Ly <lntue.h at gmail.com>
Date: Fri, 8 May 2026 05:28:33 +0000
Subject: [PATCH] [libc][NFC] Workaround for environ_internal when building
 with gcc-12.

---
 libc/src/stdlib/CMakeLists.txt | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/libc/src/stdlib/CMakeLists.txt b/libc/src/stdlib/CMakeLists.txt
index 1185f1a0fa461..7e587235447b0 100644
--- a/libc/src/stdlib/CMakeLists.txt
+++ b/libc/src/stdlib/CMakeLists.txt
@@ -67,12 +67,22 @@ add_entrypoint_object(
     .environ_internal
 )
 
+# GCC-12 crashed when building environ_internal during GIMPLE pass: waccess.
+set(environ_internal_gcc12_workaround "")
+if((${CMAKE_CXX_COMPILER_ID} STREQUAL "GNU") AND
+   (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL "12") AND
+   (CMAKE_CXX_COMPILER_VERSION VERSION_LESS "13"))
+  set(environ_internal_gcc12_workaround "-Wno-stringop-overflow")
+endif()
+
 add_object_library(
   environ_internal
   SRCS
     environ_internal.cpp
   HDRS
     environ_internal.h
+  COMPILE_OPTIONS
+    ${environ_internal_gcc12_workaround}
   DEPENDS
     libc.config.app_h
     libc.hdr.types.size_t