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Sam James a54545ba65 [CMake] Fix __builtin_thread_pointer check with LTO 
With LTO, gcc's IPA passes might drop the foo() function and then the test
will pass even on platforms where __builtin_thread_pointer is unavailable.

On PPC64, we get this as a result:
```
llvm/tools/llvm-exegesis/lib/BenchmarkRunner.cpp:361:61: error: ‘__builtin_thread_pointer’ is not supported on this targ
```

Just mark the function in the CMake configure test with the 'used' attribute to
avoid it being optimised out. The test then behaves correctly with -flto.

Tested with e.g. 'powerpc64le-linux-gnu-gcc -O2 -flto a.c'.

Reported-by: matoro
Reviewed-by: maskray
Closes: https://github.com/llvm/llvm-project/pull/70968
Signed-off-by: Sam James <sam@gentoo.org>
2023-11-05 14:54:47 +00:00
..
modules
[llvm][CMake] Respect LIBCXX_HARDENING_MODE on command-line (#68541)
2023-10-20 23:13:33 -07:00
platforms
[cmake] Fix ms-compat version in WinMsvc.cmake
2022-08-09 11:13:49 +02:00
config-ix.cmake
[CMake] Fix __builtin_thread_pointer check with LTO
2023-11-05 14:54:47 +00:00
config.guess
[cmake] Add SerenityOS to config.guess
2023-11-02 06:15:43 -04:00
dummy.cpp
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nsis_icon.ico
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nsis_logo.bmp
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README
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unwind.h
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README 

See docs/CMake.html for instructions on how to build LLVM with CMake.