Handle recursive <limits.h>

From-SVN: r8690

gcc/gsyslimits.h

@@ -3,4 +3,6 @@
    If fixincludes fixes it, then the fixed version is installed
    instead of this text.  */
 
+#define _GCC_NEXT_LIMITS_H		/* tell gcc's limits.h to recurse */
 #include_next <limits.h>
+#undef _GCC_NEXT_LIMITS_H

gcc/limitx.h

@@ -7,6 +7,6 @@
 #define _GCC_LIMITS_H_
 
 #ifndef _LIBC_LIMITS_H_
-/* Use <...> so that we find syslimits.h only in system include dirs.  */
-#include <syslimits.h>
+/* Use "..." so that we find syslimits.h only in this same directory.  */
+#include "syslimits.h"
 #endif

gcc/limity.h

@@ -1,4 +1,10 @@
 /* This administrivia gets added to the end of limits.h
    if the system has its own version of limits.h.  */
 
+#else /* not _GCC_LIMITS_H_ */
+
+#ifdef _GCC_NEXT_LIMITS_H
+#include_next <limits.h>		/* recurse down to the real one */
+#endif
+
 #endif /* not _GCC_LIMITS_H_ */