Remove stray _GNU_SOURCE definitions

We define _GNU_SOURCE globally in both the Autotools build, through the
use of the AC_USE_SYSTEM_EXTENSIONS macro; and in the Meson build, with
add_project_arguments().

boilerplate/cairo-boilerplate-system.c

@@ -23,8 +23,6 @@
  * Author: Carl D. Worth <cworth@cworth.org>
  */
 
-#define _GNU_SOURCE 1 /* for vasprintf */
-
 #include "cairo-boilerplate.h"
 #include "cairo-boilerplate-system.h"
 

perf/cairo-analyse-trace.c

@@ -29,7 +29,7 @@
  *	    Chris Wilson <chris@chris-wilson.co.uk>
  */
 
-#define _GNU_SOURCE 1	/* for sched_getaffinity() and getline() */
+#include "config.h"
 
 #include "cairo-perf.h"
 #include "cairo-stats.h"

perf/cairo-perf-micro.c

@@ -26,7 +26,7 @@
  *	    Carl Worth <cworth@cworth.org>
  */
 
-#define _GNU_SOURCE 1	/* for sched_getaffinity() */
+#include "config.h"
 
 #include "cairo-perf.h"
 #include "cairo-stats.h"

perf/cairo-perf-report.c

@@ -25,16 +25,14 @@
  * Authors: Carl Worth <cworth@cworth.org>
  */
 
+#include "config.h"
+
 #define _GETDELIM 1/* for getline() on AIX */
 
 #include "cairo-perf.h"
 #include "cairo-missing.h"
 #include "cairo-stats.h"
 
-/* We use _GNU_SOURCE for getline and strndup if available. */
-#ifndef _GNU_SOURCE
-# define _GNU_SOURCE
-#endif
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>

perf/cairo-perf-trace.c

@@ -28,7 +28,7 @@
  *	    Chris Wilson <chris@chris-wilson.co.uk>
  */
 
-#define _GNU_SOURCE 1	/* for sched_getaffinity() and getline() */
+#include "config.h"
 
 #include "cairo-missing.h"
 #include "cairo-perf.h"

src/cairo-misc.c

@@ -38,8 +38,6 @@
  *      Adrian Johnson <ajohnson@redneon.com>
  */
 
-#define _GNU_SOURCE 1	/* strtod_l() */
-
 #include "cairoint.h"
 #include "cairo-error-private.h"
 

src/cairo-quartz-surface.c

@@ -34,7 +34,6 @@
  *	Vladimir Vukicevic <vladimir@mozilla.com>
  */
 
-#define _GNU_SOURCE /* required for RTLD_DEFAULT */
 #include "cairoint.h"
 
 #include "cairo-quartz-private.h"

test/cairo-test-trace.c

@@ -52,8 +52,6 @@
  *     scope of this test.
  */
 
-#define _GNU_SOURCE 1	/* getline() */
-
 #include "cairo-test.h"
 #include "buffer-diff.h"
 

test/cairo-test.c

@@ -25,8 +25,6 @@
  *         Chris Wilson <chris@chris-wilson.co.uk>
  */
 
-#define _GNU_SOURCE 1	/* for feenableexcept() et al */
-
 #if HAVE_CONFIG_H
 #include "config.h"
 #endif

test/invalid-matrix.c

@@ -25,8 +25,8 @@
  */
 
 #define _ISOC99_SOURCE	/* for INFINITY */
-#define _GNU_SOURCE 1	/* for fedisableeexcept() et al */
 
+#include "config.h"
 #include "cairo-test.h"
 
 #if !defined(INFINITY)

test/pdiff/pdiff.c

@@ -14,8 +14,6 @@
   if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
 */
 
-#define _GNU_SOURCE
-
 #if HAVE_CONFIG_H
 #include "config.h"
 #endif

util/cairo-fdr/fdr.c

@@ -16,8 +16,6 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#define _GNU_SOURCE
-
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif

util/cairo-sphinx/fdr.c

@@ -16,8 +16,6 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#define _GNU_SOURCE
-
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif

util/cairo-trace/lookup-symbol.c

@@ -45,8 +45,6 @@
    This file was part of GNU Binutils.
    */
 
-#define _GNU_SOURCE
-
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif

util/cairo-trace/trace.c

@@ -16,8 +16,6 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#define _GNU_SOURCE
-
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif

util/show-contour.c

@@ -1,4 +1,5 @@
-#define _GNU_SOURCE
+#include "config.h"
+
 #include <gtk/gtk.h>
 #include <stdlib.h>
 #include <stdio.h>

util/show-edges.c

@@ -1,4 +1,5 @@
-#define _GNU_SOURCE
+#include "config.h"
+
 #include <gtk/gtk.h>
 #include <stdlib.h>
 #include <stdio.h>

util/show-events.c

@@ -1,4 +1,5 @@
-#define _GNU_SOURCE
+#include "config.h"
+
 #include <gtk/gtk.h>
 #include <stdlib.h>
 #include <stdio.h>

util/show-polygon.c

@@ -1,4 +1,5 @@
-#define _GNU_SOURCE
+#include "config.h"
+
 #include <gtk/gtk.h>
 #include <stdlib.h>
 #include <stdio.h>

util/show-traps.c

@@ -1,4 +1,5 @@
-#define _GNU_SOURCE
+#include "config.h"
+
 #include <gtk/gtk.h>
 #include <stdlib.h>
 #include <stdio.h>