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configure: add cp_if_changed function and use for config.h

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Originally committed as revision 21318 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Måns Rullgård 2010-01-19 04:40:08 +00:00
parent 76d81909ae
commit c34681df42
1 changed files with 7 additions and 3 deletions
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10
configure vendored
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@ -831,6 +831,12 @@ apply(){
"$@" < "$file" > "$file.tmp" && mv "$file.tmp" "$file" || rm "$file.tmp"
}
cp_if_changed(){
cmp -s "$1" "$2" &&
echo "$2 is unchanged" ||
cp -f "$1" "$2"
}
# CONFIG_LIST contains configurable options, while HAVE_LIST is for
# system-dependent things.
@ -2909,9 +2915,7 @@ echo "#endif /* FFMPEG_CONFIG_H */" >> $TMPH
echo "endif # FFMPEG_CONFIG_MAK" >> config.mak
# Do not overwrite an unchanged config.h to avoid superfluous rebuilds.
cmp -s $TMPH config.h &&
echo "config.h is unchanged" ||
mv -f $TMPH config.h
cp_if_changed $TMPH config.h
# build tree in object directory if source path is different from current one
if enabled source_path_used; then