meson: Define _DARWIN_C_SOURCE on macOS as is done in Autotools

Signed-off-by: Jordan Williams <jordan@jwillikers.com>
(cherry picked from commit df277231cf9f4dcb98dd16dc77ff5c9d4d0b1452)

diff --git a/meson.build b/meson.build
index 7c4fac1e73defc3cc11ac0b3e59c0882ae5dbe29..0af96127d969bdf41a902be8319af10e13bfc84e 100644 (file)
--- a/meson.build
+++ b/meson.build
@@ -41,6 +41,10 @@ vendordir = get_option('vendordir')
 
 add_project_arguments('-D_GNU_SOURCE', language : 'c')
 
+if host_machine.system() == 'darwin'
+  add_project_arguments('-D_DARWIN_C_SOURCE', language : 'c')
+endif
+
 cc = meson.get_compiler('c')
 
 conf = configuration_data()