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version.sh: add preprocessing guards 

Signed-off-by: Timothy Gu <timothygu99@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Timothy Gu 2013-11-29 09:57:30 -08:00 committed by Michael Niedermayer
parent 3c5c4cfa15
commit c580691091
1 changed files with 10 additions and 2 deletions
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12
version.sh
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@ -42,9 +42,17 @@ if [ -z "$2" ]; then
fi
NEW_REVISION="#define FFMPEG_VERSION \"$version\""
OLD_REVISION=$(cat "$2" 2> /dev/null)
OLD_REVISION=$(cat "$2" 2> /dev/null | head -3 | tail -1)
# String used for preprocessor guard
GUARD=$(echo "$2" | sed 's/\//_/' | sed 's/\./_/' | tr '[:lower:]' '[:upper:]' | sed 's/LIB//')
# Update version header only on revision changes to avoid spurious rebuilds
if test "$NEW_REVISION" != "$OLD_REVISION"; then
echo "$NEW_REVISION" > "$2"
cat << EOF > "$2"
#ifndef $GUARD
#define $GUARD
$NEW_REVISION
#endif /* $GUARD */
EOF
fi