From 61c35f1909b2496c7edac288a59f75604c7c179e Mon Sep 17 00:00:00 2001
From: Sebastian Harl <sh@tokkee.org>
Date: Tue, 13 Dec 2016 23:34:36 +0100
Subject: [PATCH] error: Actually check for strerror in configure and fix
 GNU-specific code.

D'oh!
---
 configure.ac      | 3 +++
 src/utils/error.c | 4 +++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 521f0ac..4d7ccae 100644
--- a/configure.ac
+++ b/configure.ac
@@ -446,6 +446,9 @@ if test "x$have_struct_ucred" != "xyes"; then
 	AC_MSG_RESULT([$have_struct_ucred])
 fi
 
+dnl Only check this after potentially defining _GNU_SOURCE.
+AC_FUNC_STRERROR_R
+
 dnl Testing.
 PKG_CHECK_MODULES([CHECK], [check >= 0.9.4],
 		[unit_tests="yes"], [unit_tests="no"])
diff --git a/src/utils/error.c b/src/utils/error.c
index f0a4827..6d23c6b 100644
--- a/src/utils/error.c
+++ b/src/utils/error.c
@@ -298,10 +298,12 @@ sdb_error_parse_priority(char *prio)
 char *
 sdb_strerror(int errnum, char *strerrbuf, size_t buflen)
 {
+	*strerrbuf = '\0';
+
 #if STRERROR_R_CHAR_P
 	{
 		char *tmp = strerror_r(errnum, strerrbuf, buflen);
-		if (*strerrbuf = '\0') {
+		if (*strerrbuf == '\0') {
 			if (tmp && (tmp != strerrbuf) && (*tmp != '\0'))
 				strncpy(strerrbuf, tmp, buflen);
 			else
-- 
2.30.2