meson: Set _GNU_SOURCE when checking <locale.h> type and functions

Otherwise neither locale_t, newlocale, nor strerror_l is detected under -Dc_std=c99. Signed-off-by: Daiki Ueno <[email protected]>
p11-glue · Aug 28, 2024 · e6c6972 · e6c6972
1 parent 0992915
commit e6c6972
Showing 1 changed file with 11 additions and 3 deletions.
diff --git a/meson.build b/meson.build
@@ -170,12 +170,20 @@ if host_system != 'windows'
 
   if cc.has_header('locale.h')
     conf.set('HAVE_LOCALE_H', 1)
-    if cc.has_type('locale_t', prefix: '#include <locale.h>')
+    locale_prefix = '''
+#define _GNU_SOURCE
+#include <locale.h>
+'''
+    if cc.has_type('locale_t', prefix: locale_prefix)
       conf.set('HAVE_LOCALE_T', 1)
-      if cc.has_function('newlocale', prefix: '#include <locale.h>')
+      if cc.has_function('newlocale', prefix: locale_prefix)
         conf.set('HAVE_NEWLOCALE', 1)
       endif
-      if cc.has_function('strerror_l', prefix: '#include <string.h>')
+      strerror_l_prefix = '''
+#define _GNU_SOURCE
+#include <string.h>
+'''
+      if cc.has_function('strerror_l', prefix: strerror_l_prefix)
         conf.set('HAVE_STRERROR_L', 1)
       endif
     endif