GHC 9.0.1 fails to x-compile for mingwW64

[ramirez7]

When I try x-compiling my project for mingwW64, Nix starts building ghc 9.0.1 from source. It eventually fails with

"/nix/store/zkqns63kcaf2a29nlargv1q40s1c5ank-ghc-8.8.4/bin/ghc" -static  -O -H64m -Wall   -package-db libraries/bootstrapping.conf  -this-unit-id ghc-heap-9.0.1 -hide-all-packages -i -ilibraries/ghc-heap/. -ilibraries/ghc-heap/dist-boot/build -Ilibraries/ghc-heap/dist-boot/build -ilibraries/ghc-heap/dist-boot/build/./autogen -Ilibraries/ghc-heap/dist-boot/build/./autogen -Ilibraries/ghc-heap/.    -optP-include -optPlibraries/ghc-heap/dist-boot/build/./autogen/cabal_macros.h -package-id base-4.13.0.0 -package-id ghc-prim-0.5.3 -package-id rts -Wall -XHaskell2010 -XNoImplicitPrelude   -no-user-package-db -rtsopts  -fno-warn-deprecated-flags      -c libraries/ghc-heap/cbits/HeapPrim.cmm -o libraries/ghc-heap/dist-boot/build/cbits/HeapPrim.o

In file included from compiler/cbits/genSym.c:1:0: error: 

includes/Rts.h:29:10: error:
     fatal error: windows.h: No such file or directory
       29 | #include <windows.h>
          |          ^~~~~~~~~~~
   |
29 | #include <windows.h>
   |          ^
compilation terminated.
`cc' failed in phase `C Compiler'. (Exit code: 1)

In file included from compiler/cbits/cutils.c:6:0: error: 

includes/Rts.h:29:10: error:
     fatal error: windows.h: No such file or directory
       29 | #include <windows.h>
          |          ^~~~~~~~~~~
   |
29 | #include <windows.h>
   |          ^
compilation terminated.
`cc' failed in phase `C Compiler'. (Exit code: 1)

In file included from compiler/cbits/keepCAFsForGHCi.c:1:0: error: 

includes/Rts.h:29:10: error:
     fatal error: windows.h: No such file or directory
       29 | #include <windows.h>
          |          ^~~~~~~~~~~
   |
29 | #include <windows.h>
   |          ^
compilation terminated.
`cc' failed in phase `C Compiler'. (Exit code: 1)

I x-compiled with:

nix-build -A projectCross.mingwW64.hsPkgs.my-project.components.exes.demo

Seems due to https://gitlab.haskell.org/ghc/ghc/-/issues/18143 / https://gitlab.haskell.org/ghc/ghc/-/issues/17146 ?

Using 9.0.1 natively works fine, however.

[ramirez7]

Here's my sources.json fwiw:

{
    "haskellNix": {
        "branch": "master",
        "description": "Alternative Haskell Infrastructure for Nixpkgs",
        "homepage": "https://input-output-hk.github.io/haskell.nix",
        "owner": "input-output-hk",
        "repo": "haskell.nix",
        "rev": "7dfd9c4f40ea679c02fd9c8f4f31c471c91ceeb1",
        "sha256": "0yc864bdqsnr3nh9ab2jfj6g606g7nwr0zv3v68saf40z6x3srck",
        "type": "tarball",
        "url": "https://github.com/input-output-hk/haskell.nix/archive/7dfd9c4f40ea679c02fd9c8f4f31c471c91ceeb1.tar.gz",
        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
    },
    "niv": {
        "branch": "master",
        "description": "Easy dependency management for Nix projects",
        "homepage": "https://github.com/nmattia/niv",
        "owner": "nmattia",
        "repo": "niv",
        "rev": "65a61b147f307d24bfd0a5cd56ce7d7b7cc61d2e",
        "sha256": "17mirpsx5wyw262fpsd6n6m47jcgw8k2bwcp1iwdnrlzy4dhcgqh",
        "type": "tarball",
        "url": "https://github.com/nmattia/niv/archive/65a61b147f307d24bfd0a5cd56ce7d7b7cc61d2e.tar.gz",
        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
    },
    "nixpkgs": {
        "branch": "20.09",
        "description": "Nix Packages collection",
        "homepage": "",
        "owner": "NixOS",
        "repo": "nixpkgs",
        "rev": "cd63096d6d887d689543a0b97743d28995bc9bc3",
        "sha256": "1wg61h4gndm3vcprdcg7rc4s1v3jkm5xd7lw8r2f67w502y94gcy",
        "type": "tarball",
        "url": "https://github.com/NixOS/nixpkgs/archive/cd63096d6d887d689543a0b97743d28995bc9bc3.tar.gz",
        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
    }
}

Nothing special in my default.nix. Just this line to use the ghc version:

{
   compiler-nix-name = "ghc901";
}

[ramirez7]

Also, it failed whether I used 20.09 or 21.05 as my nixpkgs version

[ramirez7]

ghc921 and ghc902 also fail for the same reason.

I did some browsing of ghc's gitlab, and I did find an MR by @hsyl20 titled "Hadrian: support cross-compilation to Windows", which seems promising.

I'd like to try it w/my project, but it doesn't seem easy to just use an arbitrary GHC rev - at least based on what I read in this ticket.

[hsyl20]

I don't think haskell.nix uses Hadrian yet, so #18143 is the relevant upstream issue. We still need to identify the changes to backport from HEAD to 9.0.x/9.2.x because afaik it is fixed in HEAD.

[ramirez7]

This seems to be fixed by #1450

I still ran into TH issues with system deps such as libgcc_s_seh-1.dll, but I got around that in a haskell.nix fork of mine. I'll make an issue + PR to try to sort that out.

[ramirez7]

#1483 This is what I ran into.