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Showing content from https://github.com/commercialhaskell/stack/releases/tag/v2.11.1 below:

See https://haskellstack.org/ for installation and upgrade instructions.

Changes since v2.9.3:

Behavior changes:

Add flag --[no-]-only-local-bin to Stack's upgrade command for a binary upgrade. If the Stack executable is my-stack, the default is my-stack upgrade --only-local-bin where previously it was, effectively, my-stack upgrade --no-only-local-bin. If the Stack executable is stack, the default is stack upgrade --no-only-local-bin, the same behaviour as previously.
Use $XDG_CACHE_HOME/stack/ghci-script, rather than <temp>/haskell-stack-ghci (where <temp> is the directory yielded by the temporary package's System.IO.Temp.getCanonicalTemporaryDirectory), as the base location for GHCi script files generated by stack ghci or stack repl. See #5203
Drop support for Cabal versions before 1.22 and, consequently, GHC versions before 7.10.
stack ghci and stack repl now take into account the values of default-language keys in Cabal files, like they take into account the values of default-extensions keys.
Removed --ghc-paths, --global-stack-root and --local-bin-path flags for stack path, deprecated in Stack 1.1.0 in favour of --programs, --stack-root and local-bin respectively.
On Windows, stack upgrade always renames the file of the running Stack executable (adding extension .old) before attempting to write to the original file name.
On Windows, stack upgrade does not offer sudo command alternatives if attempting to write to the original file name of the running Stack exectuable results in a 'Permission' error.

Other enhancements:

Add options of the form --PROG-option=<argument> to stack build, where PROG is a program recognised by the Cabal library and one of alex, ar, c2hs, cpphs, gcc, greencard, happy, hsc2hs, hscolour, ld, pkg-config, strip and tar. If Cabal uses the program during the configuration step, the argument is passed to it.
By default all --PROG-option options are applied to all local packages. This behaviour can be changed with new configuration option apply-prog-options.
Add flag --[no-]use-root to stack script (default disabled). Used with --compile or --optimize, when enabled all compilation outputs (including the executable) are written to a script-specific location in the scripts directory of the Stack root rather than the script's directory, avoiding clutter of the latter directory.
Better error message if the value of the STACK_WORK environment variable or --work-dir option is not a valid relative path.
Stack will use the value of the GH_TOKEN, or GITHUB_TOKEN, environment variable as credentials to authenticate its GitHub REST API requests.
stack uninstall also shows how to uninstall Stack-supplied tools.

Bug fixes:

Fix incorrect warning if allow-newer-deps are specified but allow-newer is false. See #6068.
stack build with --file-watch or --file-watch-poll outputs 'pretty' error messages, as intended. See #5978.
stack build unregisters any local packages for the sub libraries of a local package that is to be unregistered. See #6046.
The warning that sublibrary dependency is not supported is no longer triggered by internal libraries.

Thanks to all our contributors for this release:

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