libs: fix API export/import and 'inconsistent linkage' on MSVC

Export rtsp-server library API in headers when we're building the
library itself, otherwise import the API from the headers.

This fixes linker warnings on Windows when building with MSVC.

Fix up some missing config.h includes when building the lib which
is needed to get the export api define from config.h

https://bugzilla.gnome.org/show_bug.cgi?id=797185

configure.ac

@@ -258,7 +258,13 @@ fi
 AC_SUBST(DEPRECATED_CFLAGS)
 
 VISIBILITY_CFLAGS=""
-AS_COMPILER_FLAG([-fvisibility=hidden], [VISIBILITY_CFLAGS="-fvisibility=hidden"])
+AS_COMPILER_FLAG([-fvisibility=hidden], [
+  VISIBILITY_CFLAGS="-fvisibility=hidden"
+  AC_DEFINE(GST_API_EXPORT, [extern __attribute__ ((visibility ("default")))], [public symbol export define])
+], [
+  VISIBILITY_CFLAGS=""
+  AC_DEFINE(GST_API_EXPORT, [extern], [public symbol export define])
+])
 AC_SUBST(VISIBILITY_CFLAGS)
 
 dnl disable strict aliasing

gst/rtsp-server/Makefile.am

@@ -59,7 +59,7 @@ libgstrtspserver_@GST_API_VERSION@_la_SOURCES = \
 
 libgstrtspserver_@GST_API_VERSION@_la_CFLAGS = \
     $(GST_PLUGINS_BASE_CFLAGS) $(GST_NET_CFLAGS) \
-    $(GST_BASE_CFLAGS) $(GST_CFLAGS)
+    $(GST_BASE_CFLAGS) $(GST_CFLAGS) -DBUILDING_GST_RTSP_SERVER
 libgstrtspserver_@GST_API_VERSION@_la_LDFLAGS = $(GST_LIB_LDFLAGS) $(GST_ALL_LDFLAGS) $(GST_LT_LDFLAGS)
 libgstrtspserver_@GST_API_VERSION@_la_LIBADD = \
 	$(GST_PLUGINS_BASE_LIBS) $(GST_NET_LIBS) $(GST_BASE_LIBS) \

gst/rtsp-server/meson.build

@@ -48,7 +48,7 @@ gst_rtsp_server_deps = [gstrtsp_dep, gstrtp_dep, gstsdp_dep, gstnet_dep, gstapp_
 gst_rtsp_server = library('gstrtspserver-@0@'.format(api_version),
   rtsp_server_sources,
   include_directories : rtspserver_incs,
-  c_args: rtspserver_args,
+  c_args: rtspserver_args + ['-DBUILDING_GST_RTSP_SERVER'],
   version : libversion,
   soversion : soversion,
   darwin_versions : osxversion,

gst/rtsp-server/rtsp-address-pool.c

@@ -36,6 +36,9 @@
  *
  * Last reviewed on 2013-07-16 (1.0.0)
  */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
 
 #include <string.h>
 #include <gio/gio.h>

gst/rtsp-server/rtsp-auth.c

@@ -45,6 +45,9 @@
  *
  * Last reviewed on 2013-07-16 (1.0.0)
  */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
 
 #include <string.h>
 

gst/rtsp-server/rtsp-client.c

@@ -40,6 +40,9 @@
  *
  * Last reviewed on 2013-07-11 (1.0.0)
  */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
 
 #include <stdio.h>
 #include <string.h>

gst/rtsp-server/rtsp-context.c

@@ -23,6 +23,9 @@
  *
  * Last reviewed on 2013-07-11 (1.0.0)
  */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
 
 #include "rtsp-context.h"
 

gst/rtsp-server/rtsp-media-factory-uri.c

@@ -29,6 +29,9 @@
  *
  * Last reviewed on 2013-07-11 (1.0.0)
  */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
 
 #include <string.h>
 

gst/rtsp-server/rtsp-media-factory.c

@@ -37,6 +37,9 @@
  *
  * Last reviewed on 2013-07-11 (1.0.0)
  */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
 
 #include "rtsp-media-factory.h"
 

gst/rtsp-server/rtsp-media.c

@@ -62,6 +62,9 @@
  *
  * Last reviewed on 2013-07-11 (1.0.0)
  */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
 
 #include <stdio.h>
 #include <string.h>

gst/rtsp-server/rtsp-mount-points.c

@@ -34,6 +34,10 @@
  *
  * Last reviewed on 2013-07-11 (1.0.0)
  */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <string.h>
 
 #include "rtsp-mount-points.h"

gst/rtsp-server/rtsp-params.c

@@ -23,6 +23,9 @@
  *
  * Last reviewed on 2013-07-11 (1.0.0)
  */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
 
 #include <string.h>
 

gst/rtsp-server/rtsp-permissions.c

@@ -36,6 +36,9 @@
  *
  * Last reviewed on 2013-07-15 (1.0.0)
  */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
 
 #include <string.h>
 

gst/rtsp-server/rtsp-sdp.c

@@ -26,6 +26,9 @@
  *
  * Last reviewed on 2013-07-11 (1.0.0)
  */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
 
 #include <string.h>
 

gst/rtsp-server/rtsp-server-prelude.h

@@ -25,7 +25,11 @@
 #include <gst/gst.h>
 
 #ifndef GST_RTSP_SERVER_API
-#define GST_RTSP_SERVER_API GST_EXPORT
+# ifdef BUILDING_GST_RTSP_SERVER
+#  define GST_RTSP_SERVER_API GST_API_EXPORT         /* from config.h */
+# else
+#  define GST_RTSP_SERVER_API GST_API_IMPORT
+# endif
 #endif
 
 #endif /* __GST_RTSP_SERVER_PRELUDE_H__ */

gst/rtsp-server/rtsp-server.c

@@ -52,6 +52,10 @@
  *
  * Last reviewed on 2013-07-11 (1.0.0)
  */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <stdlib.h>
 #include <string.h>
 

gst/rtsp-server/rtsp-session-media.c

@@ -34,6 +34,9 @@
  *
  * Last reviewed on 2013-07-16 (1.0.0)
  */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
 
 #include <string.h>
 

gst/rtsp-server/rtsp-session-pool.c

@@ -39,6 +39,9 @@
  *
  * Last reviewed on 2013-07-11 (1.0.0)
  */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
 
 #include "rtsp-session-pool.h"
 

gst/rtsp-server/rtsp-session.c

@@ -42,6 +42,9 @@
  *
  * Last reviewed on 2013-07-11 (1.0.0)
  */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
 
 #include <string.h>
 

gst/rtsp-server/rtsp-stream-transport.c

@@ -40,6 +40,9 @@
  *
  * Last reviewed on 2013-07-16 (1.0.0)
  */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
 
 #include <string.h>
 #include <stdlib.h>

gst/rtsp-server/rtsp-stream.c

@@ -45,6 +45,9 @@
  *
  * Last reviewed on 2013-07-16 (1.0.0)
  */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
 
 #include <stdlib.h>
 #include <stdio.h>

gst/rtsp-server/rtsp-thread-pool.c

@@ -46,6 +46,9 @@
  *
  * Last reviewed on 2013-07-11 (1.0.0)
  */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
 
 #include <string.h>
 

gst/rtsp-server/rtsp-token.c

@@ -35,6 +35,9 @@
  *
  * Last reviewed on 2013-07-15 (1.0.0)
  */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
 
 #include <string.h>
 

meson.build

@@ -30,15 +30,25 @@ plugins_install_dir = '@0@/gstreamer-1.0'.format(get_option('libdir'))
 
 cc = meson.get_compiler('c')
 
+cdata = configuration_data()
+
 if cc.has_link_argument('-Wl,-Bsymbolic-functions')
   add_project_link_arguments('-Wl,-Bsymbolic-functions', language : 'c')
 endif
 
 # Symbol visibility
-if cc.has_argument('-fvisibility=hidden')
+if cc.get_id() == 'msvc'
+  export_define = '__declspec(dllexport) extern'
+elif cc.has_argument('-fvisibility=hidden')
   add_project_arguments('-fvisibility=hidden', language: 'c')
+  export_define = 'extern __attribute__ ((visibility ("default")))'
+else
+  export_define = 'extern'
 endif
 
+# Passing this through the command line would be too messy
+cdata.set('GST_API_EXPORT', export_define)
+
 # Disable strict aliasing
 if cc.has_argument('-fno-strict-aliasing')
   add_project_arguments('-fno-strict-aliasing', language: 'c')
@@ -68,7 +78,6 @@ if glib_checks.disabled() or (glib_checks.auto() and not gst_version_is_dev)
   add_project_arguments('-DG_DISABLE_CHECKS', language: 'c')
 endif
 
-cdata = configuration_data()
 cdata.set_quoted('GETTEXT_PACKAGE', 'gst-rtsp-server-1.0')
 cdata.set_quoted('PACKAGE', 'gst-rtsp-server')
 cdata.set_quoted('VERSION', gst_version)