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Do not use 'u' flag for ar

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The Reproducible Builds effort (https://wiki.debian.org/ReproducibleBuilds) in Debian (at least) means that 'ar' is built in deterministic mode as default: all timestamps are set to 0.

This is not compatible with the use of the 'u' flag, and therefore ARFLAGS has to be changed from 'cru' to 'cr'.

This gets rid of the harmless but annoying warning
  ar: `u' modifier ignored since `D' is the default (see `U')
(cherry picked from commit 987fc1d15d017c192a566fc922e3967d9d280668)
This commit is contained in:
Jean-Marc Lasgouttes 2016-05-11 17:09:34 +02:00 committed by Richard Heck
parent c25ba48f0a
commit f012b73e78
2 changed files with 5 additions and 0 deletions
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3
configure.ac
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@ -74,6 +74,9 @@ AM_PATH_PYTHON
# Tools for creating libraries (note that we do not use libtool)
m4_ifdef([AM_PROG_AR], [AM_PROG_AR]) dnl AM_PROG_AR requires automake 1.12
AC_PROG_RANLIB
dnl Recent debian/ubuntu (at least) have built 'ar' so that deterministic mode is the default.
dnl This means that it does not make sense to use the 'u' flag (default ARFLAGS is 'cru').
AC_SUBST([ARFLAGS], [cr])
### Check for a C++ compiler
dnl We have to do weird tricks so that autoconf does not touch CXXFLAGS even

2
status.22x
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@ -141,3 +141,5 @@ What's new
- Building against Qt < 4.7 no longer fails.
- Fix monolithic builds with autotools on Mac OS X.
- Avoid 'ar' warning with recent binutils versions.