[lmi-commits] [lmi] master 9b901cf: Avoid harmless but annoying "ar u" warnings in autotools builds

[Vadim Zeitlin]

branch: master
commit 9b901cf72604bab0854134f7d222296786eba47c
Author: Vadim Zeitlin <address@hidden>
Commit: Vadim Zeitlin <address@hidden>

    Avoid harmless but annoying "ar u" warnings in autotools builds
    
    Use "cr" flags with ar instead of Automake current default of "cru" to avoid
    warnings about "'u" modifier ignored" due to "D" flag being on by default in
    the recent binutils versions, built with --enable-deterministic-archives, 
used
    in the latest versions of most Linux distributions.
    
    An alternative could be to explicitly use "U" flag to disable deterministic
    builds, but the (very) modest speed benefit of "u" doesn't seem to be worth 
it.
---
 Makefile.am |    9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Makefile.am b/Makefile.am
index c5307a3..4a6be7f 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -35,6 +35,15 @@ endif
 
 ACLOCAL_AMFLAGS = -I aclocal
 
+# This is a workaround for the harmless but annoying warning
+#
+# ar: `u' modifier ignored since `D' is the default (see `U')
+#
+# given by Linux systems using recent binutils with the switch to building
+# deterministic archives (that can't include the timestamps) when building all
+# static libraries with default "cru" flags used by Automake up to 1.15.
+ARFLAGS = cr
+
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