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| author | Pavel Raiskup <praiskup@redhat.com> | 2015-04-17 16:54:58 +0200 |
|---|---|---|
| committer | Pavel Raiskup <praiskup@redhat.com> | 2015-09-26 18:00:16 +0200 |
| commit | 418129bc63afc312701e84cb8afa5ca413df1ab5 (patch) | |
| tree | 9bd8b9d437103d3ae3243783fd41dde7b2cf318d /m4 | |
| parent | 4335de1dfb7d2ec728427e07a54136b94a2d40f6 (diff) | |
| download | libtool-418129bc63afc312701e84cb8afa5ca413df1ab5.tar.gz | |
ARFLAGS: use 'cr' instead of 'cru' by default
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 $AR_FLAGS instead 'cru' string.
* doc/libtool.texi: Do 's/ar cru/ar cr/' in whole documentation.
* NEWS: Document.
Diffstat (limited to 'm4')
| -rw-r--r-- | m4/libtool.m4 | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/m4/libtool.m4 b/m4/libtool.m4 index 2d6bda98..3335def6 100644 --- a/m4/libtool.m4 +++ b/m4/libtool.m4 @@ -1042,8 +1042,8 @@ int forced_loaded() { return 2;} _LT_EOF echo "$LTCC $LTCFLAGS -c -o conftest.o conftest.c" >&AS_MESSAGE_LOG_FD $LTCC $LTCFLAGS -c -o conftest.o conftest.c 2>&AS_MESSAGE_LOG_FD - echo "$AR cru libconftest.a conftest.o" >&AS_MESSAGE_LOG_FD - $AR cru libconftest.a conftest.o 2>&AS_MESSAGE_LOG_FD + echo "$AR $AR_FLAGS libconftest.a conftest.o" >&AS_MESSAGE_LOG_FD + $AR $AR_FLAGS libconftest.a conftest.o 2>&AS_MESSAGE_LOG_FD echo "$RANLIB libconftest.a" >&AS_MESSAGE_LOG_FD $RANLIB libconftest.a 2>&AS_MESSAGE_LOG_FD cat > conftest.c << _LT_EOF @@ -1501,7 +1501,7 @@ _LT_DECL([], [AR], [1], [The archiver]) # ARFLAGS for automake and AR_FLAGS for libtool). FIXME: Make the AR_FLAGS # variable obsoleted/removed. -test ${AR_FLAGS+y} || AR_FLAGS=${ARFLAGS-cru} +test ${AR_FLAGS+y} || AR_FLAGS=${ARFLAGS-cr} lt_ar_flags=$AR_FLAGS _LT_DECL([], [lt_ar_flags], [0], [Flags to create an archive (by configure)]) |