================
Comment at: include/locale:202
@@ +201,3 @@
+#include <newlib.h> // for _NEWLIB_VERSION
+#endif
+
----------------
Can't you drop the above since `ctime` indirectly includes `newlib.h` already 
in the current version of newlib?

================
Comment at: include/support/newlib/xlocale.h:27
@@ +26,3 @@
+// duck under that velvet rope.
+int isascii(int c);
+
----------------
jroelofs wrote:
> jfb wrote:
> > `isascii` ins't in C++11 either :-)
> > 
> > Should libc++ not use it at all, or use a special `__isascii`?
> Not using it would mean lots of ugly newlib specific stuff in locale.cpp and 
> __locale. Sounds like `inline int __isascii(int c) { int isascii(int); return 
> isascii(c); }` is the way to go here.
Would you just leave __isascii in this header? Or fix the rest of libc++ and 
move it to a global header? That'll be tricky because at least glibc has 
`#define __isascii(c)`.

http://reviews.llvm.org/D5385



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