[compiler-rt] e54f31a - [compiler-rt][builtins] Add missing flag for builtins standalone build (#133046)

[via llvm-commits]

Author: Wu Yingcong
Date: 2025-03-27T10:15:48+08:00
New Revision: e54f31a20c23b2b1fdb524a63b84361703613c4e

URL: https://github.com/llvm/llvm-project/commit/e54f31a20c23b2b1fdb524a63b84361703613c4e
DIFF: https://github.com/llvm/llvm-project/commit/e54f31a20c23b2b1fdb524a63b84361703613c4e.diff

LOG: [compiler-rt][builtins] Add missing flag for builtins standalone build (#133046)

When builtins are built with runtimes, it is built before compiler-rt,
and this makes some of the HAS_XXX_FLAGs missing. In this case, the
COMPILER_RT_HAS_FCF_PROTECTION_FLAG is missing which makes it impossible
to enable CET in this case. This patch addresses this issue by also
check for such flag in standalone build instead of relying on the
compiler-rt's detection.

Added: 
    

Modified: 
    compiler-rt/cmake/builtin-config-ix.cmake

Removed: 
    


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diff  --git a/compiler-rt/cmake/builtin-config-ix.cmake b/compiler-rt/cmake/builtin-config-ix.cmake
index b1bde47ec8555..7bd3269bd999d 100644
--- a/compiler-rt/cmake/builtin-config-ix.cmake
+++ b/compiler-rt/cmake/builtin-config-ix.cmake
@@ -25,6 +25,7 @@ builtin_check_c_compiler_flag(-fconvergent-functions COMPILER_RT_HAS_FCONVERGENT
 builtin_check_c_compiler_flag("-Xclang -mcode-object-version=none" COMPILER_RT_HAS_CODE_OBJECT_VERSION_FLAG)
 builtin_check_c_compiler_flag(-Wbuiltin-declaration-mismatch COMPILER_RT_HAS_WBUILTIN_DECLARATION_MISMATCH_FLAG)
 builtin_check_c_compiler_flag(/Zl COMPILER_RT_HAS_ZL_FLAG)
+builtin_check_c_compiler_flag(-fcf-protection=full COMPILER_RT_HAS_FCF_PROTECTION_FLAG)
 
 builtin_check_c_compiler_source(COMPILER_RT_HAS_ATOMIC_KEYWORD
 "