#7430: GHC API reports CPP errors in confusing ways
----------------------------+-----------------------------------------------
Reporter: MikolajKonarski | Owner:
Type: bug | Status: new
Priority: normal | Component: GHC API
Version: 7.6.1 | Keywords:
Os: Linux | Architecture: Unknown/Multiple
Failure: Other | Blockedby:
Blocking: | Related:
----------------------------+-----------------------------------------------
When there is a CPP error, the GHC API provides a normal error message
(such as in case of type errors), e.g.,
{{{
error: missing binary operator before token "("
}}}
but it does not say it's a CPP error. In addition (and unlike for type
errors), GHC API throws an exception, e.g.,
{{{
phase `C pre-processor' failed (exitcode = 1)
}}}
which states the error comes from CPP, but is otherwise uninformative and
not tied in any way to the normal error message.
Ideally, all the information would be in the error message and the
exception that disrupts the normal control flow would not be thrown.
Here's how to reproduce this: in the following repo (uh, just realised
it's a rather large repo)
{{{
https://github.com/Mikolaj/ghc/tree/CPPrunGhc
}}}
run
{{{
ghc --make GhcRun.hs -package ghc-7.6.1
}}}
and then
{{{
./GhcRun
}}}
You should get
{{{
Normal error message:
Severity: SevError SrcSpan: RealSrcSpan (SrcSpanPoint {srcSpanFile =
"Ticks.hs", srcSpanLine = 1, srcSpanCol = 0}) MsgDoc: error: missing
binary operator before token "("
Exception:
GhcRun: phase `C pre-processor' failed (exitcode = 1)
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7430>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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