Add support for passing a version string to configure that is appended to

FFmpeg's version string output. This can be used by distributions to mark
their packages as being modified versions without hacking the sources.

Originally committed as revision 15433 to svn://svn.ffmpeg.org/ffmpeg/trunk

common.mak

@@ -49,7 +49,7 @@ $(BUILD_ROOT_REL)/version.h: $(SVN_ENTRIES)
 endif
 
 $(BUILD_ROOT_REL)/version.h:
-	$(SRC_PATH)/version.sh $(SRC_PATH) $@
+	$(SRC_PATH)/version.sh $(SRC_PATH) $@ $(EXTRA_VERSION)
 
 install: install-libs install-headers
 

configure

@@ -116,6 +116,7 @@ show_help(){
   echo "  --extra-cflags=ECFLAGS   add ECFLAGS to CFLAGS [$CFLAGS]"
   echo "  --extra-ldflags=ELDFLAGS add ELDFLAGS to LDFLAGS [$LDFLAGS]"
   echo "  --extra-libs=ELIBS       add ELIBS [$ELIBS]"
+  echo "  --extra-version=STRING   version string suffix []"
   echo "  --build-suffix=SUFFIX    suffix for application specific build []"
   echo "  --arch=ARCH              select architecture  [$arch]"
   echo "  --cpu=CPU                selects the minimum cpu required (affects"
@@ -823,6 +824,7 @@ CMDLINE_SET="
     cc
     cpu
     cross_prefix
+    extra_version
     logfile
     source_path
     target_os
@@ -1953,6 +1955,9 @@ echo "ARCH                      $arch ($cpu)"
 if test "$build_suffix" != ""; then
     echo "build suffix              $build_suffix"
 fi
+if test "$extra_version" != ""; then
+    echo "version string suffix     $extra_version"
+fi
 echo "big-endian                ${bigendian-no}"
 if test $arch = "x86_32" -o $arch = "x86_64"; then
     echo "yasm                      ${yasm-no}"
@@ -2083,6 +2088,7 @@ echo "LIBNAME=$LIBNAME" >> config.mak
 echo "SLIBPREF=$SLIBPREF" >> config.mak
 echo "SLIBSUF=$SLIBSUF" >> config.mak
 echo "EXESUF=$EXESUF" >> config.mak
+echo "EXTRA_VERSION=$extra_version" >> config.mak
 echo "DEPEND_CMD=$DEPEND_CMD" >> config.mak
 
 if enabled bigendian; then

version.sh

@@ -15,6 +15,8 @@ fi
 # no version number found
 test $revision || revision=UNKNOWN
 
+test "$3" && revision=$revision-$3
+
 NEW_REVISION="#define FFMPEG_VERSION \"$revision\""
 OLD_REVISION=`cat version.h 2> /dev/null`