Summary:
`HandleLLVMOptions` adds `-w` to the cflags if `LLVM_ENABLE_WARNINGS` is not on.
With `-w`, `check_cxx_compiler_flag` doesn't error out for unsupported flags
(for example `-mcrc` on x86_64), and those flags end up being detected as
working - and really they aren't.
I am not entirely sure what the best way to solve this is, but setting
`LLVM_ENABLE_WARNINGS` prior to including `HandleLLVMOptions` does the job.
Reviewers: phosek, beanz
Reviewed By: phosek
Subscribers: mgorny, llvm-commits
Differential Revision: https://reviews.llvm.org/D46079
llvm-svn: 331042
# Avoid checking whether the compiler is working.
set(LLVM_COMPILER_CHECKED ON)
+ # Enable warnings, otherwise -w gets added to the cflags by HandleLLVMOptions
+ # resulting in unjustified successes by check_cxx_compiler_flag.
+ set(LLVM_ENABLE_WARNINGS ON)
# Handle common options used by all runtimes.
include(AddLLVM)