Hi Serge,
On 05 June 2005 11:58, Serge D. Mechveliani wrote:
> for the first time compiles all the modules before Foo in
> 50 seconds.
> Then, I fix an error in Foo.hs and repeat "make dm".
>
> The options are set so that ghc-6.2.2 gets to Foo.hs in less
> than 1 second when doing this repeated `make'.
> It does consider each module before Foo and each time decides that
> there is no need in recompilation. It keeps on going this way:
> --------
> Considering whether compilation is required for Prelude0:
> Skipping Prelude0 ( ./Prelude0.hs, /foo/source/export/Prelude0.o )
> --------
> and so on, by the scheme
> "Considering ..XX -- {Checking usages .. --} Skipping XX".
>
> The compiler applies this way:
> --------------------
> /foo/ghc/6.2.2/inst/bin/ghc -fglasgow-exts
> -fallow-undecidable-instances
> -fallow-overlapping-instances -fno-warn-overlapping-patterns
> -fwarn-unused-binds -fwarn-unused-matches -fwarn-unused-imports
> -idemotest
> -odir /home/mechvel/dm/1.02/dm/source/export
> -hidir /home/mechvel/dm/1.02/dm/source/export
> -ddump-hi-diffs
> --make DExport -package-name dm
> --------------------
>
> Now, when ghc-6.4 does such a repeated `make', it re-compiles
> all the `previous' modules under the above options:
I'm afraid I don't know what the problem might be. Probably GHC is
looking in the wrong place for .hi files or .o files, or both.
> ---------
> Chasing modules from: DExport
> Source file changed or recompilation check turned off
> Compiling Prelude0 ( ./Prelude0.hs, /.../source/export/Prelude0.o
^^^^^^^
in particul, that looks very strange! Did you edit that by hand, or is
that the verbatim GHC output? (copying the verbatim output is usually
better, to avoid confusion).
Cheers,
Simon
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