backport symbol versioning patch

Originally committed as revision 21595 to svn://svn.ffmpeg.org/ffmpeg/branches/0.5

1 files changed, 13 insertions, 3 deletions

diff --git a/configure b/configure
index fd11501e22..229b84d21f 100755
--- a/configure
+++ b/configure
@@ -566,13 +566,18 @@ int x;
 EOF
 }
 
-check_ldflags(){
-    log check_ldflags "$@"
-    check_ld "$@" <<EOF && add_ldflags "$@"
+test_ldflags(){
+    log test_ldflags "$@"
+    check_ld "$@" <<EOF
 int main(void){ return 0; }
 EOF
 }
 
+check_ldflags(){
+    log check_ldflags "$@"
+    test_ldflags "$@" && add_ldflags "$@"
+}
+
 check_header(){
     log check_header "$@"
     header=$1
@@ -1356,6 +1361,7 @@ TMPE="${TMPDIR}/ffmpeg-conf-${RANDOM}-$$-${RANDOM}${EXESUF}"
 TMPH="${TMPDIR}/ffmpeg-conf-${RANDOM}-$$-${RANDOM}.h"
 TMPO="${TMPDIR}/ffmpeg-conf-${RANDOM}-$$-${RANDOM}.o"
 TMPS="${TMPDIR}/ffmpeg-conf-${RANDOM}-$$-${RANDOM}.S"
+TMPV="${TMPDIR}/ffmpeg-conf-${RANDOM}-$$-${RANDOM}.ver"
 TMPSH="${TMPDIR}/ffmpeg-conf-${RANDOM}-$$-${RANDOM}.sh"
 
 # make sure we can execute files in $TMPDIR
@@ -2160,6 +2166,10 @@ check_ldflags -Wl,--as-needed
 check_ldflags '-Wl,-rpath-link,\$(BUILD_ROOT)/libpostproc -Wl,-rpath-link,\$(BUILD_ROOT)/libswscale -Wl,-rpath-link,\$(BUILD_ROOT)/libavfilter -Wl,-rpath-link,\$(BUILD_ROOT)/libavdevice -Wl,-rpath-link,\$(BUILD_ROOT)/libavformat -Wl,-rpath-link,\$(BUILD_ROOT)/libavcodec -Wl,-rpath-link,\$(BUILD_ROOT)/libavutil'
 check_ldflags -Wl,-Bsymbolic
 
+echo "X{};" > $TMPV
+test_ldflags -Wl,--version-script,$TMPV &&
+    append SHFLAGS '-Wl,--version-script,\$(SUBDIR)lib\$(NAME).ver'
+
 if enabled small; then
     check_cflags -Os            # not all compilers support -Os
     optimizations="small"