clang-cl's system header detection doesn't kick in if we're using full
paths to the STL headers we need to include. And if certain headers
aren't recognized as system headers, we get a pile of warnings from
said headers. Use #include_next to ensure that system headers are
recognized as such, and suppress the warnings.
MozReview-Commit-ID: 4ZlAAGa49M1
--HG--
extra : rebase_source : c56711e09118fe930f389cc48543a661c293d7e4
Since the introduction of the STL wrappers, they have included
mozalloc.h, and multiple times, we've hit header reentrancy problems,
and worked around them as best as we could.
Taking a step back, all mozalloc.h does is:
- declare moz_* allocator functions.
- define inline implementations of various operator new/delete variants.
The first only requires the functions to be declared before they are used,
so mozalloc.h only needs to be included before anything that would use
those functions.
The second doesn't actually require a specific order, as long as the
declaration for those functions comes before their use, and they are
either declared in <new> or implicitly by the C++ compiler.
So all in all, it doesn't matter that mozalloc.h is included before the
wrapped STL headers. What matters is that it's included when STL headers
are included. So arrange things such that mozalloc.h is included after
the first wrapped STL header is fully preprocessed (and all its includes
have been included).
Nathan Froyd
Mike Hommey
Bas Schouten
Wes Kocher
Makoto Kato
Mats Palmgren
Masatoshi Kimura
Gervase Markham
Chris Jones