[PATCH weston] make error() portable

[Khem Raj]

error() is not posix but gnu extension so may not be available on all
kind of systemsi e.g. musl.

Signed-off-by: Khem Raj <raj.khem at gmail.com>
---
 configure.ac        |  2 ++
 src/weston-error.h  | 20 ++++++++++++++++++++
 src/weston-launch.c |  2 +-
 3 files changed, 23 insertions(+), 1 deletion(-)
 create mode 100644 src/weston-error.h

diff --git a/configure.ac b/configure.ac
index 263fc22..f52cd62 100644
--- a/configure.ac
+++ b/configure.ac
@@ -57,6 +57,8 @@ AC_CHECK_DECL(CLOCK_MONOTONIC,[],
 	      [[#include <time.h>]])
 AC_CHECK_HEADERS([execinfo.h])
 
+AC_CHECK_HEADERS([error.h])
+
 AC_CHECK_FUNCS([mkostemp strchrnul initgroups posix_fallocate])
 
 COMPOSITOR_MODULES="wayland-server >= 1.7.93 pixman-1 >= 0.25.2"
diff --git a/src/weston-error.h b/src/weston-error.h
new file mode 100644
index 0000000..2089d02
--- /dev/null
+++ b/src/weston-error.h
@@ -0,0 +1,20 @@
+#ifndef _WESTON_ERROR_H
+#define _WESTON_ERROR_H
+
+#if defined(HAVE_ERROR_H)
+#include <error.h>
+#else
+#include <err.h>
+#include <string.h>
+#define _weston_error(S, E, F, ...) do { \
+	if (E) \
+		err(S, F ": %s", ##__VA_ARGS__, strerror(E)); \
+	else \
+		err(S, F, ##__VA_ARGS__); \
+} while(0)
+
+#define error _weston_error
+#endif
+
+#endif
+
diff --git a/src/weston-launch.c b/src/weston-launch.c
index 10c66de..3e6d30a 100644
--- a/src/weston-launch.c
+++ b/src/weston-launch.c
@@ -30,7 +30,6 @@
 #include <poll.h>
 #include <errno.h>
 
-#include <error.h>
 #include <getopt.h>
 
 #include <sys/types.h>
@@ -56,6 +55,7 @@
 #endif
 
 #include "weston-launch.h"
+#include "weston-error.h"
 
 #define DRM_MAJOR 226
 
-- 
2.1.4