llvm-project

0d3f5ec0 - [compiler-rt][CMake] Pass all flags to _Float16 try-compile (#133952)

[compiler-rt][CMake] Pass all flags to _Float16 try-compile (#133952) The try-compile mechanism requires that `CMAKE_REQUIRED_FLAGS` is a space-separated string instead of a list of flags. The original code expanded `BUILTIN_FLAGS` into `CMAKE_REQUIRED_FLAGS` as a space-separated string and then would overwrite `CMAKE_REQUIRED_FLAGS` with `TARGET_${arch}_CFLAGS` prepended to the unexpanded `BUILTIN_CFLAGS_${arch}`. This resulted in the first two arguments being passed into the try-compile invocation, but dropping the other arguments listed in `BUILTIN_CFLAGS_${arch}`. This patch appends `TARGET_${arch}_CFLAGS` and `BUILTIN_CFLAGS_${arch}` to `CMAKE_REQUIRED_FLAGS` before expanding CMAKE_REQUIRED_FLAGS as a space-separated string. This passes any pre-set required flags, in addition to all of the builtin and target flags to the Float16 detection.