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kc3-lang/automake

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  • Author : Pavel Raiskup
    Date : 2023-11-21 08:30:00
    Hash : 8cdbdda5
    Message : automake: make the ARFLAGS default 'cr' instead of 'cru'. 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 Automake's ARFLAGS default, just to silence such warnings. Fixes bug#20082. Reported by Eric Blake. * bin/automake.in (handle_libraries): Use 'ARFLAGS=cr' by default. * doc/automake.texi (Building a library): Mention the changed ARFLAGS default. (@c LocalWords): Replace 'cru' with 'cr'. * m4/ar-lib.m4 (AM_PROG_AR): Cut out 'cru' string into separate ARFLAGS variable with new default 'cr'. * NEWS: Document.