Update to GHC 9.4 #1096
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Update to GHC 9.4 #1096
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ping this one, nixpkgs master also switched to ghc94 |
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Fwiw, I created a patch in nixpkgs upstream to fix the build: NixOS/nixpkgs#251919 |
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This looks ready to go, but it looks some builds are broken? @arcz |
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GHC 9.4 has changed toolchains to Clang, which causes issues when building with our current setup. We perform the following changes to support GHC 9.4 and later: * Use MSYS2 CLANG64 MSYS. See https://gitlab.haskell.org/ghc/ghc/-/issues/22561 * Use MSYS2 minimal $PATH. There's many things in the default GitHub environment that cause conflicts. To achieve this, we have to also manually re-add the Stack, Cabal and GHC paths. * Bump the Stack resolver. GHC 9.4.7 has some compilation fixes that are good to have around. * Replace the GHC linker with our MSYS2 linker. The GHC linker is old (~LLVM 14?) and does not fully understand the static libraries produced by the newer Clang 17 in MSYS2. * Refactor the way we invoke Stack and take advantage of the Stack config to indicate extra library and include paths. * Drop the 'strip' workaround for the test suite, as it is not needed any longer. * Fix the linking of the standard C++ library. GHC 9.4 introduces a nice way to do it in a platform-independent way, but unfortunately it does not work properly in Nix and it attempts to link clang++ instead of libc++.so, so we have to use some trickery. addDLL: stdc++ or dependencies not loaded. (Win32 error 126) See also: * https://gitlab.haskell.org/ghc/ghc/-/issues/22738 * https://gitlab.haskell.org/ghc/ghc/-/wikis/migration/9.4?version_id=b60e52482a666d25638d59cd7e86851ddf971dc1#link-against-system-cxx-std-lib-instead-of-stdc
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Oct 31, 2023
This was not committed with #1096 by mistake.
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