[src/trunk]: src/external/bsd/nvi/usr.bin/nvi Don't rebuild the header files ...

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/2134219ff3c7
branches:  trunk
changeset: 325013:2134219ff3c7
user:      christos <christos%NetBSD.org@localhost>
date:      Sat Nov 30 14:52:40 2013 +0000

description:
Don't rebuild the header files all the time if they did not change

diffstat:

 external/bsd/nvi/usr.bin/nvi/Makefile |  9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diffs (23 lines):

diff -r 1532bba823fe -r 2134219ff3c7 external/bsd/nvi/usr.bin/nvi/Makefile
--- a/external/bsd/nvi/usr.bin/nvi/Makefile     Sat Nov 30 13:23:57 2013 +0000
+++ b/external/bsd/nvi/usr.bin/nvi/Makefile     Sat Nov 30 14:52:40 2013 +0000
@@ -1,4 +1,4 @@
-#      $NetBSD: Makefile,v 1.3 2013/11/29 22:56:19 christos Exp $
+#      $NetBSD: Makefile,v 1.4 2013/11/30 14:52:40 christos Exp $
 
 .include <bsd.own.mk>
 
@@ -82,7 +82,12 @@
 _${i}_SRCS != echo ${DIST}/${i}/*.c ${DIST}/${i}/*.xs
 ${i}_extern.h: ${SRCS}
        ${_MKTARGET_CREATE}
-       ${TOOL_SED} -n "s/^ \* PUBLIC: \(.*\)/\1/p" ${.ALLSRC:M*/$i/*} > ${.TARGET}
+       @${TOOL_SED} -n "s/^ \* PUBLIC: \(.*\)/\1/p" ${.ALLSRC:M*/$i/*} > ${.TARGET}.tmp
+       @if cmp -s ${.TARGET}.tmp ${.TARGET}; then \
+               rm -f ${.TARGET}.tmp; \
+       else \
+               mv -f ${.TARGET}.tmp ${.TARGET}; \
+       fi
 .endfor
 
 DPSRCS+=version.h