Building GHC head with clang on Mavericks

[Carter Schonwald]

great sleuthing! thanks Kazu


On Thu, Nov 21, 2013 at 11:48 PM, Kazu Yamamoto <kazu at iij.ad.jp> wrote:

> Hi SimonM,
>
> >> But this patch effects templates only. When a template is included
> >> into an HS file (genearted from a '.x' file), the position is
> >> shifted. So, I'm not sure that line markers are important as you
> >> think.
> >
> > Isn't this why the line pragmas are important?  If GHC reports an
> > error in the template code, we want the error message to point to the
> > template source (GenericTemplate.hs), not the generated source file.
> > This works right now, it'd be a shame to lose it.
>
> This is what I did not understand. Thank you for this explanation.
>
> I was wondering why you are talking about line pragmas while I'm
> talking about line markers. And I noticed the real problem.
>
> It is the format change of clang's line markers. GCC's line marker is
> as follows:
>
> ----
> # 1 "<built-in>"
> ----
>
> But clang's one is as follows:
>
> ----
> # 1 "<built-in>" 1
> ----
>
> Since this kind of line markers consist of four tokens, Setup of
> alex/happy cannot convert to GHC's line pragmas. So, line markers are
> left in templates as is, resulting compile errors with
> GHC/clang-wrapper later.
>
> I sent pull requests to fix this:
>         https://github.com/simonmar/alex/pull/39
>         https://github.com/simonmar/happy/pull/15
>
> I confirmed that I can build GHC head with this patched alex/happy.
>
> The patches are redundant. SimonM may want to simplify them by
> defining local functions.
>
> --Kazu
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