Make rofi compile happily under clang.

* Set features in configure.ac
    * use config.h file, instead of hardcoded _GNU_SOURCE
      in each c file.
    * Fix mix up unsigned/signed.

configure.ac

@@ -16,6 +16,8 @@ AC_PROG_CC
 AC_PROG_CC_STDC
 AM_PROG_CC_C_O
 
+AC_USE_SYSTEM_EXTENSIONS
+
 ##
 # I3 check
 ##

include/rofi.h

@@ -1,6 +1,5 @@
 #ifndef __SIMPLESWITCHER_H__
 #define __SIMPLESWITCHER_H__
-#include <config.h>
 #include <X11/X.h>
 #include <glib.h>
 

source/dmenu-dialog.c

@@ -25,8 +25,7 @@
  *
  */
 
-
-#define _GNU_SOURCE
+#include <config.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>

source/history.c

@@ -24,9 +24,10 @@
  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  *
  */
+#include <config.h>
+#include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
-#include <stdlib.h>
 #include <unistd.h>
 #include <sys/types.h>
 #include <errno.h>

source/rofi.c

@@ -25,8 +25,7 @@
  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  *
  */
-
-#define _GNU_SOURCE
+#include <config.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>

source/run-dialog.c

@@ -24,8 +24,7 @@
  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  *
  */
-
-#define _GNU_SOURCE
+#include <config.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <X11/X.h>

source/script-dialog.c

@@ -26,7 +26,7 @@
  */
 
 
-#define _GNU_SOURCE
+#include <config.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>

source/ssh-dialog.c

@@ -25,7 +25,7 @@
  *
  */
 
-#define _GNU_SOURCE
+#include <config.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <X11/X.h>

source/textbox.c

@@ -25,7 +25,7 @@
 
  */
 
-#define _GNU_SOURCE
+#include <config.h>
 #include <X11/X.h>
 #include <X11/Xatom.h>
 #include <X11/Xlib.h>

source/xrmoptions.c

@@ -24,7 +24,7 @@
  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  *
  */
-#define _GNU_SOURCE
+#include <config.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -144,10 +144,10 @@ void parse_xresource_options ( Display *display )
                 xrmOptions[i].mem = ( *xrmOptions[i].str );
             }
             else if ( xrmOptions[i].type == xrm_Number ) {
-                *xrmOptions[i].num = (unsigned int) g_ascii_strtoll ( xrmValue.addr, NULL, 10 );
+                *xrmOptions[i].num = (unsigned int) strtoul ( xrmValue.addr, NULL, 10 );
             }
             else if ( xrmOptions[i].type == xrm_SNumber ) {
-                *xrmOptions[i].num = (int) g_ascii_strtoull ( xrmValue.addr, NULL, 10 );
+                *xrmOptions[i].snum = (int) strtol ( xrmValue.addr, NULL, 10 );
             }
             else if ( xrmOptions[i].type == xrm_Boolean ) {
                 if ( xrmValue.size > 0 && g_ascii_strncasecmp ( xrmValue.addr, "true", xrmValue.size ) == 0 ) {