kc3-lang/gnulib

2015-07-01T09:38:35

gnulib-common.m4: change the ARFLAGS default to 'cr' In some GNU/Linux distributions people started to compile 'ar' binary with --enable-deterministic-archives (binutils project). That, however, in combination with previous autotools long time working default AR{_,}FLAGS=cru causes warnings on such installations: ar: `u' modifier ignored since `D' is the default (see `U') The 'u' option (at least with GNU binutils) did small optimization during repeated builds because it instructed 'ar' to not open/close unchanged *.o files and to rather read their contents from old archive file. However, its removal should not cause a big performance hit for usual workflows. Distributions started using --enable-deterministic-archives knowing that it will disable the 'u', with the benefit of having rather a bit more deterministic builds. Also, to justify this change a bit more, keeping 'u' in ARFLAGS could only result in many per-project changes to override Automake's ARFLAGS default, just to silent such warnings. * m4/gnulib-common.m4 (gl_PROG_AR_RANLIB): Set ARFLAGS='cr' if not set already.