EricWF requested changes to this revision.
EricWF added a comment.
This revision now requires changes to proceed.

Thanks for the quick turn around. This patch is almost ready to land but still 
needs a couple more changes.


================
Comment at: include/__config:387
@@ -385,1 +386,3 @@
 #endif
+#else
+#define _LIBCPP_HAS_QUICK_EXIT
----------------
```#else // defined(_LIBCPP_HAS_MUSL_LIBC)```

================
Comment at: include/__config_site.in:21
@@ -20,2 +20,3 @@
 #cmakedefine _LIBCPP_HAS_NO_THREAD_UNSAFE_C_FUNCTIONS
 
+#cmakedefine _LIBCPP_HAS_MUSL_LIBC
----------------
No need for whitespace.

================
Comment at: include/__locale:40
@@ -39,1 +39,3 @@
 # include <xlocale.h>
+#elif defined(_LIBCPP_HAS_MUSL_LIBC)
+# include <support/musl/xlocale.h>
----------------
Since musl depends on support headers you should add a CMake check that ensures 
LIBCXX_INSTALL_SUPPORT_HEADERS is not turned off when LIBCXX_LIBC_IS_MUSL is ON.

================
Comment at: include/support/musl/xlocale.h:21
@@ +20,3 @@
+
+#include <cstdlib>
+
----------------
It looks like this header uses more symbols than are just provided by 
`cstdlib`. Please add the required includes.

================
Comment at: src/locale.cpp:958
@@ -957,3 +961,3 @@
     return static_cast<char>(__classic_lower_table()[static_cast<unsigned 
char>(c)]);
-#elif defined(__GLIBC__) || defined(__EMSCRIPTEN__) || defined(__NetBSD__)
     return isascii(c) ?
----------------
Where did the `__NetBSD__` case go?


http://reviews.llvm.org/D13673



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