Joe Fredette ha scritto:
You know, I hear theres this brilliant program for compiling C code --
gcd? ccg? gcc, yah gcc... Anyone tried it?
In all seriousness though, why do you need to compile c with ghc? I'm
curious, it seems a bit pointless...
It's for a possible extension I'm planning for Cabal.
The idea is to add support for "configuration features".
A configuration feature is similar to a "configuration flag", but with
some important differences.
data Feature = Bool | String
A feature block:
Feature HaveURandom
action: execute
include-dirs: ...
c-sources: features/urandom.c
-- other possible properties, as listed in
-- "Build information chapter", excluding `buildable` and
-- `other-modules`
-- The `action` property can have values `compile` (default`)
-- or `execute`
This means that I'm testing for a feature named "HaveURandom", and the
testing requires to compile/build and then execute some code.
In this case there is only a C source file that needs to be compiled;
this is the reason why I have asked if GHC supports compilation for C
source files only, and the creation of an executable.
Here I'm asking Cabal to execute the generated program.
If the executable returns 0, then HaveURandom will have value
`Feature True`; if it returns 1, then HaveURandom will have value
`Feature False`.
If the executable write something on stdout, then HaveURandom will have
value `Feature string`.
If compilation fails, HaveURandom will have value `Feature False`.
If `action` property is "compile", then a successful compilation will
result in HaveURandom having a value of `Feature True`.
Regards Manlio
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