From 30159aea4b3f6421da9d74a8bf22aad6d3bf26b4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=B6rg=20Krause?= <joerg.krause@embedded.rocks>
Date: Mon, 4 Apr 2016 20:48:43 +0200
Subject: [PATCH] GNU version of strerror_r not available on musl

The GNU version of glibc' `strerror_r` is non-portable.

When the POSIX and GNU API collides musl always provides the POSIX API. That
being the case for `strerror_r` musl does only support the POSIX version,
despite of `_GNU_SOURCE`.

[Upstream commit: https://github.com/pocoproject/poco/commit/30159aea4b3f6421da9d74a8bf22aad6d3bf26b4]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
---
 Foundation/src/Error.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Foundation/src/Error.cpp b/Foundation/src/Error.cpp
index 6a8afb705f..00991fc0be 100644
--- a/Foundation/src/Error.cpp
+++ b/Foundation/src/Error.cpp
@@ -69,7 +69,10 @@ namespace Poco {
 		   without -D_GNU_SOURCE is needed, otherwise the GNU version is
 		   preferred.
 		*/
-#if defined _GNU_SOURCE && !POCO_ANDROID
+		/* The GNU version of strerror_r is non-portable and not
+		   available on the musl C library.
+		 */
+#if (defined __GLIBC__ || defined __UCLIBC__) && defined _GNU_SOURCE && !POCO_ANDROID
 		char errmsg[256] = "";
 		return std::string(strerror_r(errorCode, errmsg, 256));
 #elif (_XOPEN_SOURCE >= 600) || POCO_ANDROID