[PATCH] D32411: [libcxx] Provide #include_next alternative for MSVC

[Ben Craig via Phabricator via cfe-commits]

bcraig created this revision.
Herald added a subscriber: mgorny.

Visual Studio 2015 and 2017 don't implement include_next, so we'll use a combination of a computed include and a CMAKE input to make it work.  Also, retrofit all the existing invocations of #include_next that we could hit in a hypothetical MSVC build.

This relies on implementation defined behavior in the MSVC preprocessor.
See C11, 6.10.2.4 ("Source file inclusion") for the statement on implementation defined vs. undefined.


https://reviews.llvm.org/D32411

Files:
  CMakeLists.txt
  include/__config
  include/__config_site.in
  include/complex.h
  include/cstddef
  include/ctype.h
  include/errno.h
  include/float.h
  include/inttypes.h
  include/limits.h
  include/locale.h
  include/math.h
  include/setjmp.h
  include/stdbool.h
  include/stddef.h
  include/stdint.h
  include/stdio.h
  include/stdlib.h
  include/string.h
  include/wchar.h
  include/wctype.h

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