Building GHC head with clang on Mavericks
Kazu Yamamoto (=?iso-2022-jp?B?GyRCOzNLXE9CSScbKEI=?=)
kazu at iij.ad.jp
Fri Nov 22 04:48:53 UTC 2013
>> 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
> 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
# 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
I sent pull requests to fix this:
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.
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