On my linux system, limits.h #include_nexts limits.h again, trying to
get the GCC one.
So this is what happens with clang's limits.h
#include <limits.h>
-> clang's limits.h
-> #include_next <limits.h>
-> system's limits.h
-> #include_next <limits.h>
-> error: 'limits.h' file not found
Attached is a possible fix, for your reviewing pleasure.
-Argiris
Index: test/Preprocessor/clang_headers.c
===================================================================
--- test/Preprocessor/clang_headers.c (revision 0)
+++ test/Preprocessor/clang_headers.c (revision 0)
@@ -0,0 +1,4 @@
+// RUN: clang -E %s
+
+#include <limits.h>
+
Index: lib/Headers/limits.h
===================================================================
--- lib/Headers/limits.h (revision 64397)
+++ lib/Headers/limits.h (working copy)
@@ -25,6 +25,12 @@
#ifndef __LIMITS_H
#define __LIMITS_H
+/* The system's limits.h may, in turn, try to #include_next GCC's limits.h.
+ * Avert this #include_next madness. */
+#if defined __GNUC__ && !defined _GCC_LIMITS_H_
+#define _GCC_LIMITS_H_
+#endif
+
/* System headers include a number of constants from POSIX in <limits.h>. */
#include_next <limits.h>
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