meson: fix cpu_set_t test

_GNU_SOURCE is needed here.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

diff --git a/meson.build b/meson.build
index 0881a4dee94b0a5700453603587cbacfeea81658..2edeb8c962fbaab8223672a6a2bd090e4789a0ad 100644 (file)
--- a/meson.build
+++ b/meson.build
@@ -380,7 +380,7 @@ endforeach
 have = cc.has_header('sched.h')
 conf.set10('HAVE_DECL_CPU_ALLOC', have)
 # We get -1 if the size cannot be determined
-have_cpu_set_t = cc.sizeof('cpu_set_t', prefix : '#include <sched.h>') > 0
+have_cpu_set_t = cc.sizeof('cpu_set_t', prefix : '#define _GNU_SOURCE\n#include <sched.h>') > 0
 conf.set('HAVE_CPU_SET_T', have_cpu_set_t ? 1 : false)
 
 have = cc.has_header_symbol('stdlib.h', 'environ')