Haskell Stack 3.11.1

What's new in 3.11.1

See https://haskellstack.org/ for installation and upgrade instructions.
Changes since v3.9.3:
Major changes:
- On 64-bit Windows, the default msys-environment configuration option is now CLANG64, rather than MINGW64 (which remains an option). The MSYS2 project deprecated the latter environment on 15 March 2026. The GHC project has used the former toolchain from GHC 9.4.1. No default is provided for 32-bit Windows, rather than MINGW32 (which remains an option). The MSYS2 project ceased to actively support it on 17 May 2020. 32-bit Windows is not supported by the GHC project from GHC 8.12.
Behavior changes:
- Stack's default Nix integration now includes the cacert Nix package, in order to support Stack's use of crypton-x509-system >= 1.6.8.
- Following a change to the Stackage project's server API, the default value of the urls key includes recent-snapshots: https://stackage.org/api/v1/snapshots.
- The --[no-]keep-ghc-rts flag of Stack's config env command is now enabled by default, consistent with Stack's exec command.
- On Windows, in the Stack environment, the MSYS2 usr/local/bin directory (if it exists) is now searched before the MSYS2 usr/bin directory, rather than after.
Other enhancements:
- Bump to Hpack 0.39.6.
- Experimental: Add flag --[no-]semaphore (default: disabled) to Stack's build command, to allow GHC to use a system semaphore to perform compilation in parallel when possible. Supported, by default, by GHC 9.10.1 or later. The option is considered experiemental because, on Linux only, musl and non-musl semaphores are incompatible.
- Add option --reach <packages> to Stack's dot and ls dependencies commands, to prune packages that cannot reach any of the specified packages in the dependency graph.
- Add option --test-suite-timeout-grace=SECONDS to Stack's build command to request termination of a timed-out test suite process and, after the specified grace period, force termination. Used together with the existing --test-suite-timeout=SECONDS option.
- In YAML configuration files, the recent-snapshots key is introduced (under the urls key), to specify the URL used by Stack's ls snapshots remote command.
- In YAML configuration files (stack.yaml and config.yaml), an !include <file path> directive is now supported. This allows common configuration to be shared across multiple files. …

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