Index: src/__support/CPP/limits.h
===================================================================
--- src/__support/CPP/limits.h
+++ src/__support/CPP/limits.h
@@ -11,6 +11,13 @@
 
 #include <limits.h>
 
+// Some older gcc distributions don't define these for 32 bit targets.
+#ifndef LLONG_MAX
+#define LLONG_MAX (~0LL ^ (1LL << 63))
+#define LLONG_MIN (1LL << 63)
+#define ULLONG_MAX (~0ULL)
+#endif
+
 namespace __llvm_libc {
 namespace cpp {