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The check that sets libffi_cv_as_x86_pcrel currently check for "warning" or "illegal". The problem is that when trying to build libffi with LTO clang will produce the warning
clang: warning: argument unused during compilation: '-emit-llvm'
The attached patch just uses the $CC error code instead. Is that OK or is there some strange assembler out there that rejects the assembly bug exists with 0?
Cheers, Rafael
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