Hi Jonas,

Thanks for looking at the patch!

> On 13 Feb 2016, at 01:26, Hahnfeld, Jonas <hahnf...@itc.rwth-aachen.de> wrote:
> as I did the change: Sorry that it broke for you on Darwin! I could not test 
> myself and there doesn't seem to be a build-bot…

No worries. I think it only triggered in the stage 2 Green Dragon bots (when 
the compiler was actually used to try and build some ASAN test bits).

> To the change: I think the explicit passing of -stdlib=libc++ will override 
> CLANG_DEFAULT_CXX_STDLIB on Darwin.

Good point, sorry about that. I thought I was being cunning by skipping the 
extra bits of GetCXXStdlibType.

> Instead, Darwin::AddClangCXXStdlibIncludeArgs should be implemented, maybe 
> similar to Linux::AddClangCXXStdlibIncludeArgs.

I did look into that, but there was quite a bit of logic to be refactored and I 
was very much in fire-fighting mode at the time (everything was falling down 
around me on Friday). I’ll see what I can do if things quiet down.

> With regard to the test case: First I think this currently won't ever be 
> executed because it resists in the root directory.

Good point. Don’t know how I managed to do that.

> And second: Testing the default stdlib chosen by clang is fragile now because 
> it can be changed by CLANG_DEFAULT_CXX_STDLIB which would fail all the tests!

> I already had this problem with FreeBSD and NetBSD. As a solution we could 
> think about implementing -stdlib=default which would take the architecture 
> default instead…

So what have you done in the meantime? I think I’d prefer a test that’s noisy 
in less common configurations over no test at all.

Anyway, I think I’ve fixed the big mistakes in r260898. I’ll see what I can do 
about the refactoring this week.

Cheers.

Tim.
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