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Use extern "C" instead of __BEGIN_DECL/__END_DECL macros
these macros are defined in sys/cdefs.h for glibc and this header is not available on all libc
anyway they defined like below
#ifdef __cplusplus
# define __BEGIN_DECLS extern "C" {
# define __END_DECLS }
#else
# define __BEGIN_DECLS /* empty */
# define __END_DECLS /* empty */
#endif
__THROW macro is also not available on musl, defined thusly
Upstream-Status: Pending
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Index: attr-2.4.47/include/xattr.h
===================================================================
--- attr-2.4.47.orig/include/xattr.h 2014-04-02 00:01:30.252091280 -0700
+++ attr-2.4.47/include/xattr.h 2014-04-02 00:12:57.985428099 -0700
@@ -30,8 +30,20 @@
#define XATTR_CREATE 0x1 /* set value, fail if attr already exists */
#define XATTR_REPLACE 0x2 /* set value, fail if attr does not exist */
-
-__BEGIN_DECLS
+#ifndef __THROW
+# ifndef __GNUC_PREREQ
+# define __GNUC_PREREQ(maj, min) (0)
+# endif
+# if defined __cplusplus && __GNUC_PREREQ (2,8)
+# define __THROW throw ()
+# else
+# define __THROW
+# endif
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
extern int setxattr (const char *__path, const char *__name,
const void *__value, size_t __size, int __flags) __THROW;
@@ -58,6 +70,8 @@
extern int lremovexattr (const char *__path, const char *__name) __THROW;
extern int fremovexattr (int __filedes, const char *__name) __THROW;
-__END_DECLS
+#ifdef __cplusplus
+}
+#endif
#endif /* __XATTR_H__ */
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