[gdk-pixbuf/wip/lantw/build-Bump-_XOPEN_SOURCE-to-700] build: Bump _XOPEN_SOURCE to 700

[Ting-Wei Lan <lantw src gnome org>]

commit 013052714d8ec74f16b8a035faa35a437c590636
Author: Ting-Wei Lan <lantw src gnome org>
Date:   Sun May 3 17:42:41 2020 +0800

    build: Bump _XOPEN_SOURCE to 700
    
    On FreeBSD, macros such as _POSIX_C_SOURCE and _XOPEN_SOURCE are used as
    a means to disable features instead of enabling features. Therefore,
    setting a macro to a value which is too small can make required features
    become unavailable.
    
    Commit f57bec3322921631c322b7d151fb129125b9d80d sets _XOPEN_SOURCE to
    500 and causes compilation errors on FreeBSD because of missing C99
    support. FreeBSD libc automatically sets _POSIX_C_SOURCE to 199506 when
    _XOPEN_SOURCE is set to 500. Since 1995 < 1999, this also means all C99
    functions are disabled. To fix it, use a value matching the current
    definition of _POSIX_C_SOURCE=200809, which is _XOPEN_SOURCE=700.

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index c172b95de..bd4f0dff6 100644
--- a/meson.build
+++ b/meson.build
@@ -8,7 +8,7 @@ project('gdk-pixbuf', 'c',
         ],
         meson_version: '>= 0.48.0')
 
-add_project_arguments([ '-D_POSIX_C_SOURCE=200809L', '-D_DEFAULT_SOURCE', '-D_XOPEN_SOURCE=500' ], language: 
'c')
+add_project_arguments([ '-D_POSIX_C_SOURCE=200809L', '-D_DEFAULT_SOURCE', '-D_XOPEN_SOURCE=700' ], language: 
'c')
 
 cc = meson.get_compiler('c')
 host_system = host_machine.system()