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Showing content from http://docs.haskellstack.org/en/stable/configure/global_flags/ below:

Global flags and options - Stack

Stack can also be configured by flags and options on the command line. Global flags and options apply to all of Stack's commands. In addition, all of Stack's commands accept the --setup-info-yaml and --snapshot-location-base options and the --help flag.

Restrictions: POSIX systems only

Default: True, if inside Docker; false otherwise

Enable/disable permitting users other than the owner of the Stack root directory to use a Stack installation. For further information, see the documentation for the corresponding non-project specific configuration option.

Pass the option --arch <architecture> to specify the relevant machine architecture. For further information, see the documentation for the corresponding non-project specific configuration option.

Visibility: Hidden

See the shell auto-completion documentation.

Visibility: Hidden

See the shell auto-completion documentation.

Visibility: Hidden

See the shell auto-completion documentation.

Pass the option stack --color <when> to specify when to use color in output. For further information, see the documentation for the corresponding non-project specific configuration option.

Pass the option --compiler <compiler> to specify the compiler (and, implicitly, its boot packages). For further information, see the compiler non-project specific configuration option documentation.

Pass the option --custom-preprocessor-extensions <extension> to specify an extension used for a custom preprocessor. For further information, see the documentation for the corresponding project specific configuration option.

Stack supports automatically performing builds inside a Docker container. For further information see stack --docker-help or the Docker integration documentation.

Default: Dump warning logs

Enables/disables the dumping of the build output logs for project packages to the console. For further information, see the documentation for the corresponding non-project specific configuration option.

Pass the option --extra-include-dirs <director> to specify an extra directory to check for C header files. The option can be specified multiple times. For further information, see the documentation for the corresponding non-project specific configuration option.

Pass the option --extra-lib-dirs <director> to specify an extra directory to check for libraries. The option can be specified multiple times. For further information, see the documentation for the corresponding non-project specific configuration option.

Visibility: Hidden

See the shell auto-completion documentation.

Pass the option --ghc-build <build> to specify the relevant specialised GHC build. For further information, see the documentation for the corresponding non-project specific configuration option.

Pass the option --ghc-variant <variant> to specify the relevant GHC variant. For further information, see the documentation for the corresponding non-project specific configuration option.

Pass the --help (or -h) flag to cause Stack to list its commands and flags and options common to those commands. Alternatively, command

for the same information.

3.1.1

Default: Disabled

By default, Hpack 0.20.0 or later will decline to overwrite a Cabal file that has been modified manually. Pass the flag --hpack-force to allow Hpack to overwrite such a Cabal file.

Pass the flag --hpack-numeric-version to cause Stack to report the numeric version of its built-in Hpack library to the standard output stream (e.g. 0.35.0) and quit.

Default: Enabled

Enables/disables the download and installation of GHC when necessary. On Windows, --no-install-ghc also disables the download and installation of the Stack-supplied MSYS2 when necessary. For further information, see the documentation for the corresponding non-project specific configuration option.

3.5.1

Restrictions: Windows systems only

Default: Same as the install-ghc setting (including if that is set on the command line)

If Stack is checking for the Stack-supplied MSYS2 when Stack is setting up the environment, enables/disables the download and installation of MSYS2 when necessary. For further information, see the documentation for the corresponding non-project specific configuration option.

To skip entirely checking for the Stack-supplied MSYS2, see the documentation for the skip-msys configuration option.

Pass the option --jobs <number_of_jobs> to specify the number of concurrent jobs (Stack actions during building) to run.

When building GHC from source, specifies the -j[<n>] flag of GHC's Hadrian build system.

By default, Stack specifies a number of concurrent jobs equal to the number of CPUs (cores) that the machine has. In some circumstances, that default can cause some machines to run out of memory during building. If those circumstances arise, specify --jobs 1.

This configuration option is distinct from GHC's own -j[<n>] flag, which relates to parallel compilation of modules within a package.

For further information, see the documentation for the corresponding non-project specific configuration option: jobs.

Pass the option --local-bin-path <directory> to set the target directory for stack build --copy-bins and stack install. An absolute or relative path can be specified. A relative path at the command line is always assumed to be relative to the current directory.

For further information, see the documentation for the corresponding non-project specific configuration option.

Default: read-write, if snapshot specified in the project-level configuration file; read-only, if a different snapshot is specified on the command line.

Pass the option --lock-file <mode> to specify how Stack interacts with lock files. Valid modes are:

• error-on-write: Stack reports an error, rather than write a lock file;
• ignore: Stack ignores lock files;
• read-only: Stack only reads lock files; and
• read-write: Stack reads and writes lock files.

Restrictions: Windows systems only

Default: Enabled

Enables/disables setting the codepage to support UTF-8. For further information, see the documentation for the corresponding non-project specific configuration option.

Stack can be configured to integrate with Nix. For further information, see stack --nix-help or the Nix integration documentation.

Pass the flag --numeric-version to cause Stack to report its numeric version to the standard output stream (e.g. 2.9.1) and quit.

2.13.1

Default: Disabled

Enables/disables the logging of build plan construction in debug output. Information about the build plan construction can be lengthy. If you do not need it, it is best omitted from the debug output.

A synonym for the --snapshot option to specify the snapshot resolver.

2.9.1

Default: Disabled

Enables/disables the logging of the raw snapshot layer (rsl) in debug output. Information about the raw snapshot layer can be lengthy. If you do not need it, it is best omitted from the debug output.

Default: Disabled

Enables/disables the use of options --no-run --compile with the stack script command.

Equivalent to the --verbosity silent option.

Default: Disabled

Enables/disables the skipping of checking the GHC version and architecture. For further information, see the documentation for the corresponding non-project specific configuration option.

Restrictions: Windows systems only

Default: Disabled

Enables/disables the skipping of checking for the Stack-supplied MSYS2 (and installing that MSYS2, if it is not installed) when Stack is setting up the environment. For further information, see the documentation for the corresponding non-project specific configuration option.

To prevent installation of MSYS2, if it is not installed, see the documentation for the install-msys configuration option.

2.15.1

Pass the option --snapshot <snapshot> to specify the snapshot. For further information, see the snapshot project-specific configuration option documentation.

At the command line (only):

• --snapshot lts-<major_version> specifies the latest Stackage LTS Haskell snapshot with the specified major version;
• --snapshot lts specifies, from those with the greatest major version, the latest Stackage LTS Haskell snapshot;
• --snapshot nightly specifies the most recent Stackage Nightly snapshot; and
• --snapshot global specifies the snapshot specified by the project-level configuration file in the global-project directory in the Stack root.

Pass the option --stack-colors <styles> to specify Stack's output styles. For further information, see the documentation for the corresponding non-project specific configuration option.

Overrides: STACK_ROOT environment variable

Pass the option --stack-root <absolute_path_to_the_Stack_root> to specify the path to the Stack root directory. The path must be an absolute one.

Default: stack.yaml

Overrides: STACK_YAML enviroment variable

Pass the option --stack-yaml <file> to specify Stack's project-level YAML configuration file.

Default: Disabled

Enables/disables the use of a GHC executable on the PATH, if one is available and its version matches.

Default: Stack is running in a terminal (as detected)

Enables/disables whether Stack is running in a terminal.

Default: the terminal width (if detected); otherwise 100

Pass the option --terminal-width <width> to specify the width of the terminal, used by Stack's pretty printed messages.

Default: Enabled

Enables/disables the inclusion of time stamps against logging entries when the verbosity level is 'debug'.

Equivalent to the --verbosity debug option.

Default: info

Pass the option --verbosity <log_level> to specify the level for logging. Possible levels are silent, error, warn, info and debug, in order of increasing amounts of information provided by logging.

Pass the flag --version to cause Stack to report its version to standard output and quit. For versions that are release candidates, the report will list the dependencies that Stack has been compiled with.

Pass the option --with-gcc <path_to_gcc> to specify use of a GCC executable. For further information, see the documentation for the corresponding non-project specific configuration option.

Pass the option --with-hpack <hpack> to specify use of an Hpack executable. For further information, see the documentation for the corresponding non-project specific configuration option.

Default: .stack-work

Overrides: STACK_WORK environment variable, and work-dir non-project specific configuration option.

Pass the option --work-dir <relative_path_to_the_Stack_root> to specify the path to Stack's work directory, within a local project or package directory. The path must be a relative one, relative to the the root directory of the project or package. The relative path cannot include a .. (parent directory) component.

Visibility: Hidden

See the shell auto-completion documentation.

Default: https://raw.githubusercontent.com/commercialhaskell/stackage-content/master/stack/stack-setup-2.yaml

The --setup-info-yaml <url> command option specifies the location of a setup-info dictionary. The option can be specified multiple times.

Default: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master

The --snapshot-location-base <url> command option specifies the base location of snapshots. For further information, see the documentation for the corresponding non-project specific configuration option.

If Stack is passed the --help (or -h) command flag, it will output help for the command.

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