New visibility handling in gdk

Change the visibility handling to be the same way we do it in
GLib now. We pass -fvisibility=hidden to gcc and decorate public
functions with __attribute__((visibility("default"))).

This commit just does this for GDK, GTK+ will follow later.

configure.ac

@@ -1673,6 +1673,39 @@ else
   AC_MSG_RESULT([no])
 fi
 
+##################################################
+# Visibility handling
+##################################################
+
+GDK_HIDDEN_VISIBILITY_CFLAGS=""
+case "$host" in
+  *-*-mingw*)
+    dnl on mingw32 we do -fvisibility=hidden and __declspec(dllexport)
+    AC_DEFINE([_GDK_EXTERN], [__attribute__((visibility("default"))) __declspec(dllexport) extern],
+              [defines how to decorate public symbols while building])
+    CFLAGS="${CFLAGS} -fvisibility=hidden"
+    ;;
+  *)
+    dnl on other compilers, check if we can do -fvisibility=hidden
+    SAVED_CFLAGS="${CFLAGS}"
+    CFLAGS="-fvisibility=hidden"
+    AC_MSG_CHECKING([for -fvisibility=hidden compiler flag])
+    AC_TRY_COMPILE([], [int main (void) { return 0; }],
+                   AC_MSG_RESULT(yes)
+                   enable_fvisibility_hidden=yes,
+                   AC_MSG_RESULT(no)
+                   enable_fvisibility_hidden=no)
+    CFLAGS="${SAVED_CFLAGS}"
+
+    AS_IF([test "${enable_fvisibility_hidden}" = "yes"], [
+      AC_DEFINE([_GDK_EXTERN], [__attribute__((visibility("default"))) extern],
+                [defines how to decorate public symbols while building])
+      GDK_HIDDEN_VISIBILITY_CFLAGS="-fvisibility=hidden"
+    ])
+    ;;
+esac
+AC_SUBST(GDK_HIDDEN_VISIBILITY_CFLAGS)
+
 ##################################################
 # Output commands
 ##################################################

gdk/Makefile.am

@@ -144,11 +144,11 @@ gdk_c_sources = 				\
 	gdkwindowimpl.c
 
 gdk_built_sources = 				\
+	gdkenumtypes.h				\
 	gdkenumtypes.c				\
 	gdkmarshalers.h 			\
 	gdkmarshalers.c				\
-	gdkversionmacros.h			\
-	gdkenumtypes.h
+	gdkversionmacros.h
 
 #
 # setup GDK sources and their dependencies
@@ -166,6 +166,7 @@ common_sources = 		\
 	gdkmarshalers.h
 
 libgdk_3_la_SOURCES = $(common_sources)
+libgdk_3_la_CFLAGS = $(AM_CFLAGS) $(GDK_HIDDEN_VISIBILITY_CFLAGS)
 libgdk_3_la_LIBADD = $(GDK_DEP_LIBS)
 libgdk_3_la_LDFLAGS = $(LDADD)
 

gdk/broadway/Makefile.am

@@ -4,13 +4,14 @@ include $(top_srcdir)/Makefile.decl
 libgdkincludedir = $(includedir)/gtk-3.0/gdk
 libgdkbroadwayincludedir = $(includedir)/gtk-3.0/gdk/broadway
 
-AM_CPPFLAGS =			\
-	-DG_LOG_DOMAIN=\"Gdk\"	\
-	-DGDK_COMPILATION	\
-	-I$(top_srcdir)		\
-	-I$(top_srcdir)/gdk	\
-	-I$(top_builddir)/gdk	\
-	$(GTK_DEBUG_FLAGS)	\
+AM_CPPFLAGS =				\
+	-DG_LOG_DOMAIN=\"Gdk\"		\
+	-DGDK_COMPILATION		\
+	-I$(top_srcdir)			\
+	-I$(top_srcdir)/gdk		\
+	-I$(top_builddir)/gdk		\
+	$(GDK_HIDDEN_VISIBILITY_CFLAGS) \
+	$(GTK_DEBUG_FLAGS)		\
 	$(GDK_DEP_CFLAGS)
 
 LDADDS = $(GDK_DEP_LIBS)

gdk/quartz/Makefile.am

@@ -9,6 +9,7 @@ AM_CPPFLAGS = 				\
 	-I$(top_srcdir)			\
 	-I$(top_srcdir)/gdk		\
 	-I$(top_builddir)/gdk		\
+	$(GDK_HIDDEN_VISIBILITY_CFLAGS) \
 	$(GTK_DEBUG_FLAGS) 		\
 	$(GDK_DEP_CFLAGS)		\
 	"-xobjective-c"

gdk/wayland/Makefile.am

@@ -10,6 +10,7 @@ AM_CPPFLAGS =					\
 	-I$(top_srcdir)				\
 	-I$(top_srcdir)/gdk			\
 	-I$(top_builddir)/gdk			\
+	$(GDK_HIDDEN_VISIBILITY_CFLAGS)		\
 	$(GTK_DEBUG_FLAGS)			\
 	$(GDK_DEP_CFLAGS)
 

gdk/win32/Makefile.am

@@ -5,14 +5,15 @@ libgdkincludedir = $(includedir)/gtk-3.0/gdk
 libgdkwin32includedir = $(includedir)/gtk-3.0/gdk/win32
 
 AM_CPPFLAGS = \
-	-DG_LOG_DOMAIN=\"Gdk\"	\
-	-DINSIDE_GDK_WIN32	\
-	-I$(top_srcdir)		\
-	-I$(top_srcdir)/gdk	\
-	-I$(top_builddir)/gdk	\
-	$(GTK_DEBUG_FLAGS) 	\
-	$(GDK_DEP_CFLAGS)	\
-	$(GDK_WIN32_EXTRA_CFLAGS)\
+	-DG_LOG_DOMAIN=\"Gdk\"		\
+	-DINSIDE_GDK_WIN32		\
+	-I$(top_srcdir)			\
+	-I$(top_srcdir)/gdk		\
+	-I$(top_builddir)/gdk		\
+	$(GDK_HIDDEN_VISIBILITY_CFLAGS) \
+	$(GTK_DEBUG_FLAGS) 		\
+	$(GDK_DEP_CFLAGS)		\
+	$(GDK_WIN32_EXTRA_CFLAGS)	\
 	-DGDK_COMPILATION
 
 LDADDS = $(GDK_DEP_LIBS)

gdk/x11/Makefile.am

@@ -4,13 +4,14 @@ include $(top_srcdir)/Makefile.decl
 libgdkincludedir = $(includedir)/gtk-3.0/gdk
 libgdkx11includedir = $(includedir)/gtk-3.0/gdk/x11
 
-AM_CPPFLAGS = 			\
-	-DG_LOG_DOMAIN=\"Gdk\"	\
-	-DGDK_COMPILATION	\
-	-I$(top_srcdir)		\
-	-I$(top_srcdir)/gdk	\
-	-I$(top_builddir)/gdk	\
-	$(GTK_DEBUG_FLAGS) 	\
+AM_CPPFLAGS = 				\
+	-DG_LOG_DOMAIN=\"Gdk\"		\
+	-DGDK_COMPILATION		\
+	-I$(top_srcdir)			\
+	-I$(top_srcdir)/gdk		\
+	-I$(top_builddir)/gdk		\
+	$(GDK_HIDDEN_VISIBILITY_CFLAGS) \
+	$(GTK_DEBUG_FLAGS) 		\
 	$(GDK_DEP_CFLAGS)
 
 LDADDS = $(GDK_DEP_LIBS)