pkgsCross.ghcjs.haskellPackages.ghc: don't revert edited config.sub

GHC ships a [modified] config.sub so that js-unknown-ghcjs is accepted
by autotools. For some platforms, we automatically update config.sub
from upstream's source in order to prevent that builds fail when we use
an outdated config.sub. In this case of course the perfectly up to date
config.sub would reject the target platform we are trying to use, so we
must disable this mechanism for now.

I have asked in the GHC IRC channel if there are any plans on
upstreaming the platform. It would be nice if were able to drop this
change in the future.

1 files changed, 2 insertions, 0 deletions

diff --git a/pkgs/development/compilers/ghc/common-hadrian.nix b/pkgs/development/compilers/ghc/common-hadrian.nix
index 15073bfec107..5f0953b1bca3 100644
--- a/pkgs/development/compilers/ghc/common-hadrian.nix
+++ b/pkgs/development/compilers/ghc/common-hadrian.nix
@@ -353,6 +353,8 @@ stdenv.mkDerivation ({
   '';
 
   ${if targetPlatform.isGhcjs then "configureScript" else null} = "emconfigure ./configure";
+  # GHC currently ships an edited config.sub so ghcjs is accepted which we can not rollback
+  ${if targetPlatform.isGhcjs then "dontUpdateAutotoolsGnuConfigScripts" else null} = true;
 
   # TODO(@Ericson2314): Always pass "--target" and always prefix.
   configurePlatforms = [ "build" "host" ]