From bb1747b1bf92431e5c5e9699824d2ef52f863f45 Mon Sep 17 00:00:00 2001
From: Tom Lee <github@tomlee.co>
Date: Wed, 18 Nov 2015 00:04:54 -0800
Subject: Fix strerror_r on some esoteric platforms

Defining _XOPEN_SOURCE=1 causes strange behavior on Debian kfreebsd
archs (i.e. GNU userspace with FreeBSD kernel) when _GNU_SOURCE is not
defined.

Not sure I fully understand the bizarre semantics, but it seems to
use the XSI-compliant interface
(int strerror_r(int, char*, size_t)) but the GNU implementation
(char *strerror_r(int, char*, size_t)) such that strerror_r returns
32-bits of a 64-bit char * on x86_64 kfreebsd. We would expect
strerror_r to return zero when using the XSI-compliant strerror_r
implementation or a 64-bit char* when using the GNU version. Instead,
we get something in between!

Unless I'm missing something, being more explicit about what version
of _XOPEN_SOURCE we want seems to be the prudent thing to do here --
and if folks want the GNU implementation of strerror_r for some reason
they can always -D_GNU_SOURCE explicitly.
---
 fmacros.h | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/fmacros.h b/fmacros.h
index 19d7b21..2d7348b 100644
--- a/fmacros.h
+++ b/fmacros.h
@@ -8,10 +8,8 @@
 
 #if defined(__sun__)
 #define _POSIX_C_SOURCE 200112L
-#elif defined(__linux__) || defined(__OpenBSD__) || defined(__NetBSD__)
-#define _XOPEN_SOURCE 600
 #else
-#define _XOPEN_SOURCE
+#define _XOPEN_SOURCE 600
 #endif
 
 #if __APPLE__ && __MACH__
-- 
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