[BUILD] report commit date and not author's date as build date

By default, when building from a git tree, haproxy's release date is
set to the last commit's date. But it was the wrong date which was
used, the initial patch's date, which can cause time jumps in the
past when an old patch gets merged. What we want is the commit date,
which reflects the correct code history.
(cherry picked from commit 446024e7fb5faef86cd6e2c0aba3c4524ad77705)

diff --git a/Makefile b/Makefile
index 1d22eba21aeed88ebc13bac3452dc06065de534d..bf268f35c68de81cf5d823b9ec44e94909c9ec1c 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -258,8 +258,8 @@ ifeq ($(IGNOREGIT),)
 VERSION := $(shell [ -d .git/. ] && ref=`(git-describe --tags) 2>/dev/null` && ref=$${ref%-g*} && echo "$${ref\#v}")
 ifneq ($(VERSION),)
 # OK git is there and works.
-SUBVERS := $(shell comms=`git-log --no-merges v$(VERSION).. 2>/dev/null |grep -c ^commit `; [ $$comms -gt 0 ] && echo "-$$comms" )
-VERDATE := $(shell date +%Y/%m/%d -d "`git-log HEAD^.. 2>/dev/null | grep -m 1 ^Date: | cut -f2- -d: | cut -f1 -d+`" )
+SUBVERS := $(shell comms=`git log --no-merges v$(VERSION).. 2>/dev/null |grep -c ^commit `; [ $$comms -gt 0 ] && echo "-$$comms" )
+VERDATE := $(shell date +%Y/%m/%d -d "`git log --pretty=fuller HEAD^.. 2>/dev/null | sed -ne '/^CommitDate:/{s/\(^[^ ]*:\)\|\( [-+].*\)//gp;q}'`" )
 endif
 endif