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wchar.h: only include other headers if _FORTIFY_SOURCE is enabled
unexpectedly including other headers can cause problems with
sensitive/brittle code, particularly with alternative compilers
(clang) which are already operating on the margins of what's
supported/expected by some projects.
having a way to almost entirely short-circuit these headers (by
disabling _FORTIFY_SOURCE) is therefore important.
--- a/include/fortify/wchar.h
+++ b/include/fortify/wchar.h
@@ -20,21 +20,23 @@
#if !defined(__cplusplus) && !defined(__clang__)
__extension__
#endif
-#include_next <limits.h>
+#include_next <wchar.h>
+
+#if defined(_FORTIFY_SOURCE) && _FORTIFY_SOURCE > 0 && defined(__OPTIMIZE__) && __OPTIMIZE__ > 0
+
#if !defined(__cplusplus) && !defined(__clang__)
__extension__
#endif
-#include_next <stdlib.h>
+#include_next <limits.h>
#if !defined(__cplusplus) && !defined(__clang__)
__extension__
#endif
-#include_next <string.h>
+#include_next <stdlib.h>
#if !defined(__cplusplus) && !defined(__clang__)
__extension__
#endif
-#include_next <wchar.h>
+#include_next <string.h>
-#if defined(_FORTIFY_SOURCE) && _FORTIFY_SOURCE > 0 && defined(__OPTIMIZE__) && __OPTIMIZE__ > 0
#include "fortify-headers.h"
#ifdef __cplusplus
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