Do not use 'u' flag for ar

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)

diff --git a/configure.ac b/configure.ac
index 5edced6bfcd6e585793f64dfb48399b8d1b3bd53..615653fca64c7e9c5aed525a7b9dad32e1d0d37a 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -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

diff --git a/status.22x b/status.22x
index 7739e6e59f61165f40087db928c0d969c33502b7..61898c91d7a273205ed4626706ac03281beffdff 100644 (file)
--- a/status.22x
+++ b/status.22x
@@ -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.