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In some GNU/Linux distributions people started to compile 'ar' binary with --enable-deterministic-archives (binutils project). That, however, in combination with our previous 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 would disable the 'u', just to rather have 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 Libtool's ARFLAGS default, just to silent such warnings. Fixes bug#19967. Reported by Eric Blake. * m4/libtool.m4 (_LT_PROG_AR): Default AR_FLAGS to 'cr'. (_LT_REQUIRED_DARWIN_CHECKS): Use $AR_FLAGS instead 'cru' string. * doc/libtool.texi: Do 's/ar cru/ar cr/' in whole documentation. * NEWS: Document. |
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