[Haskell-iPhone] Building a Special Cross-Compiler

[Simon Marlow]

Yes, this is correct.  ghc_boot_platform describes the platforms for the 
stage 1 compiler (assuming you're looking at the one in 
compiler/stage1).  ghcplatform.h describes the platforms in use for 
compiled code, so the host in that case is ios.  In fact ghcplatform.h 
shouldn't have a target platform at all - the only reason it does is for 
"backwards compatibility", though I don't remember exactly what goes 
wrong if we remove these.

Cheers,
Simon

On 11/12/2013 00:08, Alex Carter wrote:
> I'm on an interesting journey building a GHC cross-compiler on Windows
> to target iOS, using a third-party iOS toolchain for Windows
> (http://www.pmbaty.com/iosbuildenv/ for the curious), and I'm running
> into an unusual issue. Since this is a cross-compiler, this should be
> all stage 1, so in ghc_boot_platform.h I see what I expect:
>
>      ...
>      #define BUILD_OS "mingw32"
>      #define HOST_OS "mingw32"
>      #define TARGET_OS "ios"
>      ...
>
> but ghcplatform.h shows:
>
>      ...
>      #define BUILD_OS  "mingw32"
>      #define HOST_OS  "ios"
>      ...
>      #define TARGET_OS  "ios"
>      ...
>
> which I understand to mean that whatever's happening there is set up
> for the stage 2 compiler (unless there's some good magic happening
> here with the deriveConstants utility?). I discovered this through a
> pragma added at the error site:
>
>      ...
>      rts/Task.h:280:9: note: #pragma message: HOST_OS=ios
>      rts/Task.h:287:5: error: aggregate value used where an integer was expected
>      ...
>
> Anybody know what's going on here? Is it right (for some reason beyond
> my current comprehension) for ghcplatform.h to have the #defines it
> does? Is HOST_OS=ios correct, but rts/Task.h:280 should also check
> defined(ios_HOST_OS)?
>
> Thanks for the help,
> Alex
>
>
>
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