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Convert the check for stdatomic.h into a compile step as opposed to existence check #58532

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Sep 2, 2021
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Convert the check for stdatomic.h into a compile step as opposed to existence check #58532

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3 changes: 1 addition & 2 deletions src/coreclr/pal/src/libunwind/configure.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -17,8 +17,7 @@ if(CLR_CMAKE_HOST_WIN32)
endif (NOT HAVE_STDALIGN_H)

# MSVC compiler is currently missing C11 stdatomic.h header
# Fake it until support is added
check_include_files(stdatomic.h HAVE_STDATOMIC_H)
check_c_source_compiles("#include <stdatomic.h> void main() { _Atomic int a; }" HAVE_STDATOMIC_H)
if (NOT HAVE_STDATOMIC_H)
configure_file(include/win/fakestdatomic.h.in ${CMAKE_CURRENT_BINARY_DIR}/include/stdatomic.h COPYONLY)
endif (NOT HAVE_STDATOMIC_H)
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