shithub: openh264

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Avoid rebuilds if the version header hasn't changed

When generating the version header, don't overwrite it if the
new version is identical to the old one.

--- a/codec/common/generate_version.sh

+++ b/codec/common/generate_version.sh

@@ -1,5 +1,4 @@

 #!/bin/bash

-rm -f codec/common/inc/version.h

 git rev-list HEAD | sort > config.git-hash

 LOCALVER=`wc -l config.git-hash | awk '{print $1}'`

 if [ $LOCALVER \> 1 ] ; then

@@ -15,6 +14,13 @@

 GIT_VERSION='"'$GIT_VERSION'"'

 rm -f config.git-hash

-cat codec/common/inc/version.h.template | sed "s/\$FULL_VERSION/$GIT_VERSION/g" > codec/common/inc/version.h

+cat codec/common/inc/version.h.template | sed "s/\$FULL_VERSION/$GIT_VERSION/g" > codec/common/inc/version.h.new

+if cmp codec/common/inc/version.h.new codec/common/inc/version.h > /dev/null 2>&1; then

+    # Identical to old version, don't touch it (to avoid unnecessary rebuilds)

+    rm codec/common/inc/version.h.new

+    echo "Keeping existing codec/common/inc/version.h"

+    exit 0

+fi

+mv codec/common/inc/version.h.new codec/common/inc/version.h

 echo "Generated codec/common/inc/version.h"