https://bugs.exim.org/show_bug.cgi?id=2769
--- Comment #2 from Rich Siegel <sie...@barebones.com> --- Calling an unavailable API is never a NOP. You'll get a runtime error from dyld which ends up calling abort() on any OS which doesn't implement it. It looks like this: dyld: Symbol not found: _pthread_jit_write_protect_np Referenced from: /path/to/app/executable Expected in: /usr/lib/libSystem.B.dylib If compiler compatibility is more than a theoretical issue, it should be possible to further conditionalize the call as needed: #ifdef __has_builtin #if __has_builtin(builtin_available) // do the work #endif #endif If you're not compiling with a version of Xcode which includes a version of clang which supports __builtin_availble(), it's a given that you can't call pthread_jit_write_protect_np() because it won't exist in the SDK. -- You are receiving this mail because: You are on the CC list for the bug. -- ## List details at https://lists.exim.org/mailman/listinfo/pcre-dev
