[cfe-dev] libc++ clean-up

[Yaron Keren]

Yes, noticed this before. iostream pulls a significant part of libcxx:

 http://lists.cs.uiuc.edu/pipermail/cfe-dev/2013-October/032330.html

There are real unobvious dependecies in libcxx

 http://lists.cs.uiuc.edu/pipermail/cfe-dev/2013-October/032349.html

I'm not sure if the #includes could be removed. Would probably require
breaking up large headers into smaller ones.

Yaron



2014-09-04 15:36 GMT+03:00 "C. Bergström" <cbergstrom at pathscale.com>:

>
> Hi
>
> Would patches for cleaning up unnecessary #include for libc++ be accepted?
> In general it seems like it has followed the rather poorly designed GNU STL
> rather than being more strict.
>
> A simple preprocessed hello world which only #include <iostream>
>
> CC -E hello.cxx -std=c++11  > hello-libcxx.e.cxx
>
> du -sh *.e.cxx
> 532K    hello-stdcxx.e.cxx
> 1.3M    hello-libcxx.e.cxx
>
> The effects of this cascade into being a measurable performance difference
> later on in the compiler. (My numbers may not be exactly llvm upstream
> though - ymmv) Basically the Module size and other things are larger as a
> result.
>
> Thoughts/feedback?
>
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