smeenai added a comment. In https://reviews.llvm.org/D23719#521250, @rsmith wrote:
> Is there a -nodefaultlib analogue of -nostdinc++ to turn off just the C++ > standard library portion of the link? There's `-nostdlib`, but if I'm parsing the GCC documentation <https://gcc.gnu.org/onlinedocs/gcc/Link-Options.html> correctly, it's even more restrictive than `-nodefaultlibs`, since it omits the startup files as well. > My concern is that -nodefaultlib may suppress the addition of -latomic to the > link line, and if so, the configure-time check would always fail, even though > an actual link using libc++'s <atomic> would work. Hmm. I understand what you mean, but this configure-time check is for compiling libc++ itself, and if a driver adds `-latomic` automatically, I'd argue this check is actually incorrect as it stands right now: - We run `check_cxx_source_compiles` to check if `-latomic` is required - This links without `-nodefaultlibs`, and the driver adds the `-latomic` in that case, so we report that we don't need the flag - We try compiling libc+, which passes `-nodefaultlibs`, and now the driver doesn't give us `-latomic`, and our configuration said we didn't need the flag explicitly, so compilation fails If the driver doesn't add `-latomic` automatically, the above wouldn't be a problem, but then my proposed change wouldn't be a problem either. https://reviews.llvm.org/D23719 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
