Commit db7470b048a14bdc69a34fbd192ec626e1786411
2017-01-10T04:27:25
Gracefully handle lack of system <sys/cdefs.h> This is the case on musl. Fixes: https://bugs.debian.org/810589
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diff --git a/include/bsd/sys/cdefs.h b/include/bsd/sys/cdefs.h
index 75d3955..044f221 100644
--- a/include/bsd/sys/cdefs.h
+++ b/include/bsd/sys/cdefs.h
@@ -24,15 +24,40 @@
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
+#ifndef __has_include
+#define __has_include 1
+#endif
+#ifndef __has_include_next
+#define __has_include_next 1
+#endif
+
#ifdef LIBBSD_OVERLAY
+/*
+ * Some libc implementations do not have a <sys/cdefs.h>, in particular
+ * musl, try to handle this gracefully.
+ */
+#if __has_include_next(<sys/cdefs.h>)
#include_next <sys/cdefs.h>
+#endif
#else
+#if __has_include(<sys/cdefs.h>)
#include <sys/cdefs.h>
#endif
+#endif
#ifndef LIBBSD_SYS_CDEFS_H
#define LIBBSD_SYS_CDEFS_H
+#ifndef __BEGIN_DECLS
+#ifdef __cplusplus
+#define __BEGIN_DECLS extern "C" {
+#define __END_DECLS }
+#else
+#define __BEGIN_DECLS
+#define __END_DECLS
+#endif
+#endif
+
/*
* Some kFreeBSD headers expect those macros to be set for sanity checks.
*/