"error: ‘__va_copy’ was not declared in this scope" while building libomp against musl libc

[llvmbot]

Bugzilla Link	34040
Resolution	FIXED
Resolved on	Aug 19, 2017 17:06
Version	unspecified
OS	Linux
Reporter	LLVM Bugzilla Contributor

Extended Description

Building libomp-3.9.0 in Gentoo Linux with musl as libc using GCC-6.3.0 or GCC-5.4.0 results in:

/var/tmp/portage/sys-libs/libomp-3.9.0/work/openmp-3.9.0.src/runtime/src/kmp_str.c:211:40: error: ‘__va_copy’ was not declared in this scope
__va_copy( _args, args ); // Make copy of args.
^

musl had previously provided "__va_copy" but has since relegated it only for scenarios in which "GNUC < 3", in favor of using "va_copy" (see http://git.musl-libc.org/cgit/musl/commit/?id=def0af189871a499efdc9bc37438d8b20eb702ab).

Seeing as libomp source code already uses one-line, double-slash style comments which require at least C99 dialect, and that va_copy is a C99 macro, the best course of action would be to change "__va_copy" to "va_copy".

[llvmbot]

Fixed with https://reviews.llvm.org/rL311269

[hahnjo]

mentioned in issue llvm/llvm-bugzilla-archive#35168