add support for the LONG_LONG_MIN/LONG_LONG_MAX/ULONG_LONG_MAX limits.h GNU extensions.
rdar://6740292
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@68169 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Headers/limits.h b/lib/Headers/limits.h
index 1f542ea..e4909ab 100644
--- a/lib/Headers/limits.h
+++ b/lib/Headers/limits.h
@@ -96,4 +96,19 @@
#define ULLONG_MAX (__LONG_LONG_MAX__*2ULL+1ULL)
#endif
+/* LONG_LONG_MIN/LONG_LONG_MAX/ULONG_LONG_MAX are a GNU extension. It's too bad
+ that we don't have something like #pragma poison that could be used to
+ deprecate a macro - the code should just use LLONG_MAX and friends.
+ */
+#if defined(__GNU_LIBRARY__) ? defined(__USE_GNU) : !defined(__STRICT_ANSI__)
+
+#undef LONG_LONG_MIN
+#undef LONG_LONG_MAX
+#undef ULONG_LONG_MAX
+
+#define LONG_LONG_MAX __LONG_LONG_MAX__
+#define LONG_LONG_MIN (-__LONG_LONG_MAX__-1LL)
+#define ULONG_LONG_MAX (__LONG_LONG_MAX__*2ULL+1ULL)
+#endif
+
#endif /* __CLANG_LIMITS_H */