libtool: prefer -export-dynamic over -export-regex, -export-symbols if...

libtool: prefer -export-dynamic over -export-regex, -export-symbols if compiler already supports symbol visibility (gcc 4.x), this should also deprecate libvlc.sym

bootstrap

@@ -224,8 +224,12 @@ include Modules.am
 LTLIBVLC = -L\$(top_builddir)/src -lvlc
 
 AM_LDFLAGS = -rpath '\$(libvlcdir)' -avoid-version \\
-	-module -no-undefined -shrext \$(LIBEXT) \\
-	-export-symbol-regex ^\$(VLC_ENTRY)\$\$
+	-module -no-undefined -shrext \$(LIBEXT) 
+if HAVE_COMPILER_EXPORT
+AM_LDFLAGS += -export-dynamic
+else
+AM_LDFLAGS += -export-symbol-regex ^\$(VLC_ENTRY)\$\$
+endif
 AM_LIBADD = \$(LTLIBVLC)
 
 all: all-modules

configure.ac

@@ -1058,6 +1058,8 @@ if test "${ac_cv_c_visibility_hidden}" != "no"; then
     VLC_ADD_CFLAGS([libvlc plugin],[-fvisibility=hidden])
 fi
 
+AM_CONDITIONAL(HAVE_COMPILER_EXPORT, [test "$SYS" = "mingw32" -o "${ac_cv_c_visibility_hidden}" != "no"])
+
 dnl Check for -fvisibility-inlines-hidden (breaks x86_64 linkers)
 dnl AC_LANG_PUSH(C++)
 dnl     AC_CACHE_CHECK([if \$CXX accepts -fvisibility-inlines-hidden],

src/Makefile.am

@@ -110,7 +110,13 @@ libvlc_la_CFLAGS = `$(VLC_CONFIG) --cflags libvlc`
 libvlc_la_CXXFLAGS = `$(VLC_CONFIG) --cxxflags libvlc`
 libvlc_la_OBJCFLAGS = `$(VLC_CONFIG) --objcflags libvlc`
 libvlc_la_LDFLAGS = $(AM_LDFLAGS) `$(VLC_CONFIG) --libs libvlc` \
-	-export-symbols $(srcdir)/libvlc.sym -version-info 1:0:0
+	-version-info 1:0:0
+if HAVE_COMPILER_EXPORT
+libvlc_la_LDFLAGS += -export-dynamic
+else
+libvlc_la_LDFLAGS += -export-symbols $(srcdir)/libvlc.sym 
+endif
+
 libvlc_la_DEPENDENCIES = libvlc.sym
 
 libvlc_control_la_SOURCES = $(SOURCES_libvlc_control)
@@ -118,6 +124,12 @@ libvlc_control_la_LIBADD = libvlc.la
 libvlc_control_la_CFLAGS = `$(VLC_CONFIG) --cflags libvlc`
 libvlc_control_la_LDFLAGS = $(AM_LDFLAGS) -export-symbols-regex '^_?(libvlc|mediacontrol)_.*' \
 	-version-info 0:0:0
+if HAVE_COMPILER_EXPORT
+libvlc_control_la_LDFLAGS += -export-dynamic
+else
+libvlc_control_la_LDFLAGS += -export-symbols-regex '^_?(libvlc|mediacontrol)_.*'
+endif
+
 
 EXTRA_libvlc_la_SOURCES = \
 	$(SOURCES_libvlc_beos) \