backport symbol versioning patch

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

common.mak

@@ -9,6 +9,7 @@ vpath %.c $(SRC_DIR)
 vpath %.h $(SRC_DIR)
 vpath %.S $(SRC_DIR)
 vpath %.asm $(SRC_DIR)
+vpath %.v   $(SRC_DIR)
 
 ifeq ($(SRC_DIR),$(SRC_PATH_BARE))
 BUILD_ROOT_REL = .
@@ -43,6 +44,9 @@ CFLAGS := -DHAVE_AV_CONFIG_H -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE \
 
 %$(EXESUF): %.c
 
+%.ver: %.v
+	sed 's/$$MAJOR/$($(basename $(@F))_VERSION_MAJOR)/' $^ > $@
+
 SVN_ENTRIES = $(SRC_PATH_BARE)/.svn/entries
 ifeq ($(wildcard $(SVN_ENTRIES)),$(SVN_ENTRIES))
 $(BUILD_ROOT_REL)/version.h: $(SVN_ENTRIES)
@@ -77,7 +81,7 @@ checkheaders: $(filter-out %_template.ho,$(ALLHEADERS:.h=.ho))
 DEPS := $(OBJS:.o=.d)
 depend dep: $(DEPS)
 
-CLEANSUFFIXES = *.o *~ *.ho
+CLEANSUFFIXES = *.o *~ *.ho *.ver
 LIBSUFFIXES   = *.a *.lib *.so *.so.* *.dylib *.dll *.def *.dll.a *.exp *.map
 DISTCLEANSUFFIXES = *.d *.pc
 

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"

libavcodec/libavcodec.v

+LIBAVCODEC_$MAJOR {
+        global: *;
+};

libavdevice/libavdevice.v

+LIBAVDEVICE_$MAJOR {
+        global: avdevice_*;
+        local: *;
+};

libavfilter/libavfilter.v

+LIBAVFILTER_$MAJOR {
+        global: avfilter_*; av_*;
+        local: *;
+};

libavformat/libavformat.v

+LIBAVFORMAT_$MAJOR {
+        global: *;
+};

libavutil/libavutil.v

+LIBAVUTIL_$MAJOR {
+        global: av_*; ff_*; avutil_*;
+        local: *;
+};

libpostproc/libpostproc.v

+LIBPOSTPROC_$MAJOR {
+        global: postproc_*; pp_*;
+        local: *;
+};

libswscale/libswscale.v

+LIBSWSCALE_%MAJOR% {
+        global: *;
+};

subdir.mak

@@ -27,7 +27,7 @@ install-libs: install-lib$(NAME)-shared
 $(SUBDIR)$(SLIBNAME): $(SUBDIR)$(SLIBNAME_WITH_MAJOR)
 	cd ./$(SUBDIR) && $(LN_S) $(SLIBNAME_WITH_MAJOR) $(SLIBNAME)
 
-$(SUBDIR)$(SLIBNAME_WITH_MAJOR): $(OBJS)
+$(SUBDIR)$(SLIBNAME_WITH_MAJOR): $(OBJS) $(SUBDIR)lib$(NAME).ver
 	$(SLIB_CREATE_DEF_CMD)
 	$(CC) $(SHFLAGS) $(FFLDFLAGS) -o $$@ $$(filter-out $(DEP_LIBS),$$^) $(FFEXTRALIBS) $(EXTRAOBJS)
 	$(SLIB_EXTRA_CMD)