[gtk+/wip/meson: 55/136] meson: set _GNU_SOURCE project wide

[Emmanuele Bassi <ebassi src gnome org>]

commit 496a5960a796a49e589785ef99a3d20a54f73744
Author: Tim-Philipp Müller <tim centricular com>
Date:   Sat Mar 11 22:06:07 2017 +0000

    meson: set _GNU_SOURCE project wide
    
    Easier, also means we don't have to define it for
    checks. that will only succeed with it defind.

 meson.build |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/meson.build b/meson.build
index 04a1f5e..196e3e1 100644
--- a/meson.build
+++ b/meson.build
@@ -19,6 +19,8 @@ gtk_micro_version = gtk_version[2].to_int()
 gtk_interface_age = 0
 add_global_arguments('-DGTK_VERSION="' + meson.project_version() + '"', language: 'c')
 
+add_project_arguments('-D_GNU_SOURCE', language : 'c')
+
 # Define a string for the earliest version that this release has
 # backwards binary compatibility with for all interfaces a module
 # might. Unless we add module-only API with lower stability