From 60273e8b2c11d42215a5707bc55e3e0d8f350e07 Mon Sep 17 00:00:00 2001
From: Justus Winter <justus@g10code.com>
Date: Mon, 13 Feb 2017 14:58:07 +0100
Subject: [PATCH] build: Use macOS' compatibility macros to enable all
 features.

* configure.ac: On macOS, use the compatibility macros to expose every
feature of the libc.  This is the equivalent of _GNU_SOURCE on GNU
libc.
--
Not defining this leads to compilation errors or superfluous warnings
on macOS.

GnuPG-bug-id: 2910
Signed-off-by: Justus Winter <justus@g10code.com>
---
 configure.ac | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/configure.ac b/configure.ac
index a5ee77b7..ba269016 100644
--- a/configure.ac
+++ b/configure.ac
@@ -167,6 +167,8 @@ case "${host}" in
 	have_ld_version_script=yes
         ;;
     *-apple-darwin*)
+        AC_DEFINE(_DARWIN_C_SOURCE, 900000L,
+                  Expose all libc features (__DARWIN_C_FULL).)
         AC_DEFINE(_XOPEN_SOURCE, 500, Activate POSIX interface on MacOS X)
         ;;
 esac