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[CMake] Fix __builtin_thread_pointer check with LTO #70968

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Merged
merged 1 commit into from
Nov 5, 2023
Merged

[CMake] Fix __builtin_thread_pointer check with LTO #70968

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7 changes: 6 additions & 1 deletion llvm/cmake/config-ix.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -65,7 +65,12 @@ check_include_file(fenv.h HAVE_FENV_H)
check_symbol_exists(FE_ALL_EXCEPT "fenv.h" HAVE_DECL_FE_ALL_EXCEPT)
check_symbol_exists(FE_INEXACT "fenv.h" HAVE_DECL_FE_INEXACT)
check_c_source_compiles("
void *foo() {
#if __has_attribute(used)
#define LLVM_ATTRIBUTE_USED __attribute__((__used__))
#else
#define LLVM_ATTRIBUTE_USED
#endif
LLVM_ATTRIBUTE_USED void *foo() {
return __builtin_thread_pointer();
}
int main(void) { return 0; }"
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