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-rw-r--r--gl/string.in.h21
1 files changed, 19 insertions, 2 deletions
diff --git a/gl/string.in.h b/gl/string.in.h
index fefc421890..47e11883ec 100644
--- a/gl/string.in.h
+++ b/gl/string.in.h
@@ -15,16 +15,32 @@
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>. */
-#ifndef _@GUARD_PREFIX@_STRING_H
-
#if __GNUC__ >= 3
@PRAGMA_SYSTEM_HEADER@
#endif
@PRAGMA_COLUMNS@
+#if defined _GL_ALREADY_INCLUDING_STRING_H
+/* Special invocation convention:
+ - On OS X/NetBSD we have a sequence of nested includes
+ <string.h> -> <strings.h> -> "string.h"
+ In this situation system _chk variants due to -D_FORTIFY_SOURCE
+ might be used after any replacements defined here. */
+
+#@INCLUDE_NEXT@ @NEXT_STRING_H@
+
+#else
+/* Normal invocation convention. */
+
+#ifndef _@GUARD_PREFIX@_STRING_H
+
+#define _GL_ALREADY_INCLUDING_STRING_H
+
/* The include_next requires a split double-inclusion guard. */
#@INCLUDE_NEXT@ @NEXT_STRING_H@
+#undef _GL_ALREADY_INCLUDING_STRING_H
+
#ifndef _@GUARD_PREFIX@_STRING_H
#define _@GUARD_PREFIX@_STRING_H
@@ -1027,3 +1043,4 @@ _GL_WARN_ON_USE (strverscmp, "strverscmp is unportable - "
#endif /* _@GUARD_PREFIX@_STRING_H */
#endif /* _@GUARD_PREFIX@_STRING_H */
+#endif