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configure.ac: Make BUILD_{DATE, TIME} respect SOURCE_DATE_EPOCH if set

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Whilst working on the Reproducible Builds effort [0], we noticed that
xorg-server could not be built reproducibly. One reason is because it
embeds a "current" build and date time.

This should be compatible with both GNU and BSD date(1).

 [0] https://reproducible-builds.org/

v2: Fix change in Y-M-D format that broke the build.

Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Adam Jackson <ajax@redhat.com>
This commit is contained in:
Chris Lamb 2017-09-01 12:22:56 -07:00 committed by Adam Jackson
parent a49379b604
commit 937ed782ae
1 changed files with 8 additions and 2 deletions
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10
configure.ac
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@ -2402,9 +2402,15 @@ AC_DEFINE_DIR(PROJECTROOT, prefix, [Overall prefix])
AC_DEFINE_DIR(SYSCONFDIR, sysconfdir, [sysconfdir])
AC_SUBST([RELEASE_DATE])
BUILD_DATE="`date +'%Y%m%d'`"
DATE_FMT="%Y%m%d"
TIME_FMT="1%H%M%S"
BUILD_DATE="`date "+$DATE_FMT"`"
BUILD_TIME="`date "+$TIME_FMT"`"
if test "x$SOURCE_DATE_EPOCH" != "x"; then
BUILD_DATE="`date -u -d "@$SOURCE_DATE_EPOCH" "+$DATE_FMT" 2>/dev/null || date -u -r "$SOURCE_DATE_EPOCH" "+$DATE_FMT" 2>/dev/null || date -u "+$DATE_FMT"`"
BUILD_TIME="`date -u -d "@$SOURCE_DATE_EPOCH" "+$TIME_FMT" 2>/dev/null || date -u -r "$SOURCE_DATE_EPOCH" "+$TIME_FMT" 2>/dev/null || date -u "+$TIME_FMT"`"
fi
AC_SUBST([BUILD_DATE])
BUILD_TIME="`date +'1%H%M%S'`"
AC_SUBST([BUILD_TIME])
DIX_CFLAGS="-DHAVE_DIX_CONFIG_H $XSERVER_CFLAGS"