Nick, when you made changes to the JS engine's #includes, did you
observe a change in build times?

On Sat, Aug 3, 2013 at 1:14 AM, Nicholas Nethercote
<n.netherc...@gmail.com> wrote:
> On Sat, Aug 3, 2013 at 5:47 PM, Mike Hommey <m...@glandium.org> wrote:
>>
>> One piece of the puzzle, at least in Mozilla code, is the tendency to
>> #include "Foo.h" when class Bar contains a field of type Foo*, instead of
>> leaving the include to Bar.cpp and forward declare in Bar.h. This
>> certainly contributes to the conflation of the number of includes (most
>> if not all includers of Bar.h don't need Foo.h, and that chains up
>> pretty easily).
>>
>> I don't remember if IWYU tells about those. Does it?
>
> It does!  In the "file X should add the following:" parts it lists
> both #includes and forward declarations.
>
> Despite its imperfections[*] it's a pretty good tool, and you can get
> much further, much faster with it than you can manually.  If anyone
> wants to try it out, I'm happy to help with setting it up and all
> that.
>
> Nick
>
> [*] One imperfection I forgot to mention is that, although it gives me
> info on every .cpp file in SpiderMonkey, for some reason it doesn't
> give me info on every .h file, and I haven't worked out why.  This is
> frustrating, since minimizing #include statements in .h files is
> likely to have bigger benefits than minimizing them in .cpp files.
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