compnerd added inline comments.

================
Comment at: include/__config:158
+#if defined(_WIN32)
+#  define _LIBCPP_WIN32         1
 #  define _LIBCPP_LITTLE_ENDIAN 1
----------------
EricWF wrote:
> smeenai wrote:
> > Perhaps `_LIBCPP_WIN32API` instead, to be clear that this is specific to 
> > the usage of Win32 APIs, rather than just a general catch-all libc++ on 
> > Windows macro?
> +1 for that name, since it is self documenting.
Yeah, I like `WIN32API` better too.  Ill change that.


================
Comment at: include/__config:791
 // Most unix variants have catopen.  These are the specific ones that don't.
-#if !defined(_WIN32) && !defined(__BIONIC__) && !defined(_NEWLIB_VERSION)
+#if !defined(__BIONIC__) && !defined(_NEWLIB_VERSION)
 #define _LIBCPP_HAS_CATOPEN 1
----------------
EricWF wrote:
> smeenai wrote:
> > Windows has `catopen`?
> This is nested in a block that already excludes windows.
What @EricWF said :-).


================
Comment at: include/type_traits:1684
 // PE/COFF does not support alignment beyond 8192 (=0x2000)
-#if !defined(_WIN32)
+#if !defined(__ELF__) && !defined(__MACH__)
 _CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x4000);
----------------
EricWF wrote:
> smeenai wrote:
> > Might be cleaner to have a `_LIBCPP_COFF` macro (both here and for the 
> > similar `__config` change), to make the intent clearer?
> +1 for `_LIBCPP_COFF` or similar. I would rather explicitly exclude coff than 
> include a list of supported formats.
WFM, Ill introduce a `_LIBCPP_ELF`, `_LIBCPP_MACHO`, and `_LIBCPP_COFF`.


Repository:
  rL LLVM

https://reviews.llvm.org/D28223



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