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newvers.sh: avoid regenerating vers.c if content unchanged

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When reproducible build mode is enabled vers.c may be unchanged between
successive builds.  In this case avoid changing the file's metadata so
that it does not cause dependent targets to be rebuilt.

Sponsored by:	The FreeBSD Foundation
Reviewed by:	imp
Differential Revision:	https://reviews.freebsd.org/D17892
This commit is contained in:
Ed Maste 2018-11-07 20:36:57 +00:00
parent a42546df88
commit 179460e148
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=340238
1 changed files with 6 additions and 1 deletions
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7
sys/conf/newvers.sh
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@ -328,7 +328,7 @@ else
VERSTR="${VERINFO}\\n ${u}@${h}:${d}\\n"
fi
cat << EOF > vers.c
vers_content_new=$(cat << EOF
$COPYRIGHT
#define SCCSSTR "@(#)${VERINFO}"
#define VERSTR "${VERSTR}"
@ -342,5 +342,10 @@ char osrelease[sizeof(RELSTR) > 32 ? sizeof(RELSTR) : 32] = RELSTR;
int osreldate = ${RELDATE};
char kern_ident[] = "${i}";
EOF
)
vers_content_old=$(cat vers.c 2>/dev/null || true)
if [ "$vers_content_new" != "$vers_content_old" ]; then
echo "$vers_content_new" > vers.c
fi
echo $((v + 1)) > version