Improve the build system to *properly* remove unnecessary symbols from the runtime global namespace. Along the way, change the prefixes on some internal-only API calls to use a common prefix.

With these changes, for a module to export symbols into the global namespace, it must have *both* the AST_MODFLAG_GLOBAL_SYMBOLS flag and a linker script that allows the linker to leave the symbols exposed in the module's .so file (see res_odbc.exports for an example).



git-svn-id: http://svn.digium.com/svn/asterisk/branches/1.4@182808 f38db490-d61c-443f-a65b-d21fe96a405b

3 files changed, 39 insertions, 8 deletions

diff --git a/main/Makefile b/main/Makefile
index c8a878378..0b83191e0 100644
--- a/main/Makefile
+++ b/main/Makefile
@@ -94,6 +94,10 @@ ifeq ($(OSARCH),SunOS)
   ASTLINK=
 endif
 
+ifeq ($(GNU_LD),1)
+ASTLINK+=-Wl,--version-script,asterisk.exports
+endif
+
 editline/libedit.a:
 	cd editline && test -f config.h || CFLAGS="$(PTHREAD_CFLAGS) $(subst $(ASTTOPDIR),../../,$(ASTCFLAGS:-Werror=))" LDFLAGS="$(ASTLDFLAGS)" ./configure --build=$(BUILD_PLATFORM) --host=$(HOST_PLATFORM) --with-ncurses=$(NCURSES_DIR) --with-curses=$(CURSES_DIR) --with-termcap=$(TERMCAP_DIR) --with-tinfo=$(TINFO_DIR)
 	$(MAKE) -C editline libedit.a
@@ -133,20 +137,19 @@ else
   H323LDLIBS=
 endif
 
-asterisk: $(OBJS) editline/libedit.a db1-ast/libdb1.a $(AST_EMBED_LDSCRIPTS)
+asterisk: $(OBJS) editline/libedit.a db1-ast/libdb1.a $(AST_EMBED_LDSCRIPTS) asterisk.exports
 	@$(ASTTOPDIR)/build_tools/make_build_h > $(ASTTOPDIR)/include/asterisk/build.h.tmp
 	@if cmp -s $(ASTTOPDIR)/include/asterisk/build.h.tmp $(ASTTOPDIR)/include/asterisk/build.h ; then echo ; else \
 		mv $(ASTTOPDIR)/include/asterisk/build.h.tmp $(ASTTOPDIR)/include/asterisk/build.h ; \
 	fi
 	@rm -f $(ASTTOPDIR)/include/asterisk/build.h.tmp
 	@$(CC) -c -o buildinfo.o $(ASTCFLAGS) buildinfo.c
-	$(ECHO_PREFIX) echo "   [LD] $^ -> $@"
+	$(ECHO_PREFIX) echo "   [LD] $(OBJS) editline/libedit.a db1-ast/libdb1.a $(AST_EMBED_LDSCRIPTS) -> $@"
 ifneq ($(findstring chan_h323,$(MENUSELECT_CHANNELS)),)
-	$(CMD_PREFIX) $(CC) $(STATIC_BUILD) -o $@ $(ASTLINK) $(AST_EMBED_LDFLAGS) $(ASTLDFLAGS) $^ buildinfo.o $(AST_LIBS) $(AST_EMBED_LIBS)
+	$(CMD_PREFIX) $(CC) $(STATIC_BUILD) -o $@ $(ASTLINK) $(AST_EMBED_LDFLAGS) $(ASTLDFLAGS) $(OBJS) editline/libedit.a db1-ast/libdb1.a $(AST_EMBED_LDSCRIPTS) buildinfo.o $(AST_LIBS) $(AST_EMBED_LIBS)
 else
-	$(CMD_PREFIX) $(CXX) $(STATIC_BUILD) -o $@ $(ASTLINK) $(AST_EMBED_LDFLAGS) $(ASTLDFLAGS) $(H323LDFLAGS) $^ buildinfo.o $(AST_LIBS) $(AST_EMBED_LIBS) $(H323LDLIBS)
+	$(CMD_PREFIX) $(CXX) $(STATIC_BUILD) -o $@ $(ASTLINK) $(AST_EMBED_LDFLAGS) $(ASTLDFLAGS) $(H323LDFLAGS) $(OBJS) editline/libedit.a db1-ast/libdb1.a $(AST_EMBED_LDSCRIPTS) buildinfo.o $(AST_LIBS) $(AST_EMBED_LIBS) $(H323LDLIBS)
 endif
-	$(CMD_PREFIX) $(ASTTOPDIR)/build_tools/strip_nonapi $@ || rm $@
 
 clean::
 	rm -f asterisk
diff --git a/main/asterisk.exports b/main/asterisk.exports
new file mode 100644
index 000000000..f18c0fff0
--- /dev/null
+++ b/main/asterisk.exports
@@ -0,0 +1,28 @@
+{
+	global:
+		ast_*;
+		_ast_*;
+		__ast_*;
+		pbx_*;
+		astman_*;
+		ao2_*;
+		__ao2_*;
+		option_debug;
+		option_verbose;
+		dahdi_chan_name;
+		dahdi_chan_name_len;
+		dahdi_chan_mode;
+		cid_di;
+		cid_dr;
+		clidsb;
+		MD5*;
+		sched_*;
+		io_*;
+		jb_*;
+		channelreloadreason2txt;
+		devstate2str;
+		manager_event;
+		dialed_interface_info;
+	local:
+		*;
+};
diff --git a/main/astobj2.c b/main/astobj2.c
index 56ab75a21..8157c78cf 100644
--- a/main/astobj2.c
+++ b/main/astobj2.c
@@ -128,7 +128,7 @@ static inline struct astobj2 *INTERNAL_OBJ(void *user_data)
 #ifndef DEBUG_THREADS
 int ao2_lock(void *user_data)
 #else
-int _ao2_lock(void *user_data, const char *file, const char *func, int line, const char *var)
+int __ao2_lock(void *user_data, const char *file, const char *func, int line, const char *var)
 #endif
 {
 	struct astobj2 *p = INTERNAL_OBJ(user_data);
@@ -150,7 +150,7 @@ int _ao2_lock(void *user_data, const char *file, const char *func, int line, con
 #ifndef DEBUG_THREADS
 int ao2_trylock(void *user_data)
 #else
-int _ao2_trylock(void *user_data, const char *file, const char *func, int line, const char *var)
+int __ao2_trylock(void *user_data, const char *file, const char *func, int line, const char *var)
 #endif
 {
 	struct astobj2 *p = INTERNAL_OBJ(user_data);
@@ -177,7 +177,7 @@ int _ao2_trylock(void *user_data, const char *file, const char *func, int line,
 #ifndef DEBUG_THREADS
 int ao2_unlock(void *user_data)
 #else
-int _ao2_unlock(void *user_data, const char *file, const char *func, int line, const char *var)
+int __ao2_unlock(void *user_data, const char *file, const char *func, int line, const char *var)
 #endif
 {
 	struct astobj2 *p = INTERNAL_OBJ(user_data);