Always #define _GNU_SOURCE to pull in pipe2() declarations

Summary: [folly::Subprocess] Always #define _GNU_SOURCE to pull in pipe2() declarations

Test Plan: Compile

Reviewed By: tudorb@fb.com

FB internal diff: D1327004

diff --git a/folly/Subprocess.cpp b/folly/Subprocess.cpp
index 3f25f7ffb68d78cc2525b291be95c227142e93fa..54f614b59fc94efd22285f1b67d4ec0e293e9f54 100644 (file)
--- a/folly/Subprocess.cpp
+++ b/folly/Subprocess.cpp
@@ -21,6 +21,10 @@
 #endif
 #include <fcntl.h>
 #include <poll.h>
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
 #include <unistd.h>
 
 #include <array>