Ubuntu Manpage: cmake-presets - CMakePresets.json

NAME

       cmake-presets - CMakePresets.json

INTRODUCTION

       New in version 3.19.

       One  problem  that CMake users often face is sharing settings with other people for common
       ways to configure a project. This may be done to support  CI  builds,  or  for  users  who
       frequently  use  the  same  build.  CMake  supports  two main files, CMakePresets.json and
       CMakeUserPresets.json, that allow users to specify common configure options and share them
       with others. CMake also supports files included with the include field.

       CMakePresets.json  and  CMakeUserPresets.json  live  in the project's root directory. They
       both have exactly the same format, and both are optional (though  at  least  one  must  be
       present  if  --preset  is  specified).  CMakePresets.json is meant to specify project-wide
       build details, while CMakeUserPresets.json is meant for developers to  specify  their  own
       local build details.

       CMakePresets.json  may be checked into a version control system, and CMakeUserPresets.json
       should NOT be checked in. For example, if a project is using Git, CMakePresets.json may be
       tracked, and CMakeUserPresets.json should be added to the .gitignore.

FORMAT

The files are a JSON document with an object as the root:

{
"version": 6,
"cmakeMinimumRequired": {
"major": 3,
"minor": 23,
"patch": 0
},
"include": [
"otherThings.json",
"moreThings.json"
],
"configurePresets": [
{
"name": "default",
"displayName": "Default Config",
"description": "Default build using Ninja generator",
"generator": "Ninja",
"binaryDir": "${sourceDir}/build/default",
"cacheVariables": {
"FIRST_CACHE_VARIABLE": {
"type": "BOOL",
"value": "OFF"
},
"SECOND_CACHE_VARIABLE": "ON"
},
"environment": {
"MY_ENVIRONMENT_VARIABLE": "Test",
"PATH": "$env{HOME}/ninja/bin:$penv{PATH}"
},
"vendor": {
"example.com/ExampleIDE/1.0": {
"autoFormat": true
}
}
},
{
"name": "ninja-multi",
"inherits": "default",
"displayName": "Ninja Multi-Config",
"description": "Default build using Ninja Multi-Config generator",
"generator": "Ninja Multi-Config"
},
{
"name": "windows-only",
"inherits": "default",
"displayName": "Windows-only configuration",
"description": "This build is only available on Windows",
"condition": {
"type": "equals",
"lhs": "${hostSystemName}",
"rhs": "Windows"
}
}
],
"buildPresets": [
{
"name": "default",
"configurePreset": "default"
}
],
"testPresets": [
{
"name": "default",
"configurePreset": "default",
"output": {"outputOnFailure": true},
"execution": {"noTestsAction": "error", "stopOnFailure": true}
}
],
"packagePresets": [
{
"name": "default",
"configurePreset": "default",
"generators": [
"TGZ"
]
}
],
"workflowPresets": [
{
"name": "default",
"steps": [
{
"type": "configure",
"name": "default"
},
{
"type": "build",
"name": "default"
},
{
"type": "test",
"name": "default"
},
{
"type": "package",
"name": "default"
}
]
}
],
"vendor": {
"example.com/ExampleIDE/1.0": {
"autoFormat": false
}
}
}

The root object recognizes the following fields:

version
A required integer representing the version of the JSON schema. The supported
versions are:

1 New in version 3.19.

2 New in version 3.20.

3 New in version 3.21.

4 New in version 3.23.

5 New in version 3.24.

6 New in version 3.25.

7 New in version 3.27.

cmakeMinimumRequired
An optional object representing the minimum version of CMake needed to build this
project. This object consists of the following fields:

major An optional integer representing the major version.

minor An optional integer representing the minor version.

patch An optional integer representing the patch version.

include
An optional array of strings representing files to include. If the filenames are
not absolute, they are considered relative to the current file. This is allowed in
preset files specifying version 4 or above. See Includes for discussion of the
constraints on included files.

vendor An optional map containing vendor-specific information. CMake does not interpret
the contents of this field except to verify that it is a map if it does exist.
However, the keys should be a vendor-specific domain name followed by a /-separated
path. For example, the Example IDE 1.0 could use example.com/ExampleIDE/1.0. The
value of each field can be anything desired by the vendor, though will typically be
a map.

configurePresets
An optional array of Configure Preset objects. This is allowed in preset files
specifying version 1 or above.

buildPresets
An optional array of Build Preset objects. This is allowed in preset files
specifying version 2 or above.

testPresets
An optional array of Test Preset objects. This is allowed in preset files
specifying version 2 or above.

packagePresets
An optional array of Package Preset objects. This is allowed in preset files
specifying version 6 or above.

workflowPresets
An optional array of Workflow Preset objects. This is allowed in preset files
specifying version 6 or above.

Includes
CMakePresets.json and CMakeUserPresets.json can include other files with the include field
in file version 4 and later. Files included by these files can also include other files.
If CMakePresets.json and CMakeUserPresets.json are both present, CMakeUserPresets.json
implicitly includes CMakePresets.json, even with no include field, in all versions of the
format.

If a preset file contains presets that inherit from presets in another file, the file must
include the other file either directly or indirectly. Include cycles are not allowed
among files. If a.json includes b.json, b.json cannot include a.json. However, a file may
be included multiple times from the same file or from different files.

Files directly or indirectly included from CMakePresets.json should be guaranteed to be
provided by the project. CMakeUserPresets.json may include files from anywhere.

Starting from version 7, the include field supports macro expansion, but only $penv{}
macro expansion.

Configure Preset
Each entry of the configurePresets array is a JSON object that may contain the following
fields:

name A required string representing the machine-friendly name of the preset. This
identifier is used in the cmake --preset option. There must not be two configure
presets in the union of CMakePresets.json and CMakeUserPresets.json in the same
directory with the same name. However, a configure preset may have the same name
as a build, test, package, or workflow preset.

hidden An optional boolean specifying whether or not a preset should be hidden. If a
preset is hidden, it cannot be used in the --preset= argument, will not show up in
the CMake GUI, and does not have to have a valid generator or binaryDir, even from
inheritance. hidden presets are intended to be used as a base for other presets to
inherit via the inherits field.

inherits
An optional array of strings representing the names of presets to inherit from.
This field can also be a string, which is equivalent to an array containing one
string.

The preset will inherit all of the fields from the inherits presets by default
(except name, hidden, inherits, description, and displayName), but can override
them as desired. If multiple inherits presets provide conflicting values for the
same field, the earlier preset in the inherits array will be preferred.

A preset can only inherit from another preset that is defined in the same file or
in one of the files it includes (directly or indirectly). Presets in
CMakePresets.json may not inherit from presets in CMakeUserPresets.json.

condition
An optional Condition object. This is allowed in preset files specifying version 3
or above.

vendor An optional map containing vendor-specific information. CMake does not interpret
the contents of this field except to verify that it is a map if it does exist.
However, it should follow the same conventions as the root-level vendor field. If
vendors use their own per-preset vendor field, they should implement inheritance in
a sensible manner when appropriate.

displayName
An optional string with a human-friendly name of the preset.

description
An optional string with a human-friendly description of the preset.

generator
An optional string representing the generator to use for the preset. If generator
is not specified, it must be inherited from the inherits preset (unless this preset
is hidden). In version 3 or above, this field may be omitted to fall back to
regular generator discovery procedure.

Note that for Visual Studio generators, unlike in the command line -G argument, you
cannot include the platform name in the generator name. Use the architecture field
instead.

architecture, toolset
Optional fields representing the platform and toolset, respectively, for generators
that support them.

See cmake -A option for possible values for architecture and cmake -T for toolset.

Each may be either a string or an object with the following fields:

value An optional string representing the value.

strategy
An optional string telling CMake how to handle the architecture or toolset
field. Valid values are:

"set" Set the respective value. This will result in an error for generators
that do not support the respective field.

"external"
Do not set the value, even if the generator supports it. This is
useful if, for example, a preset uses the Ninja generator, and an IDE
knows how to set up the Visual C++ environment from the architecture
and toolset fields. In that case, CMake will ignore the field, but
the IDE can use them to set up the environment before invoking CMake.

If no strategy field is given, or if the field uses the string form rather
than the object form, the behavior is the same as "set".

toolchainFile
An optional string representing the path to the toolchain file. This field
supports macro expansion. If a relative path is specified, it is calculated
relative to the build directory, and if not found, relative to the source
directory. This field takes precedence over any CMAKE_TOOLCHAIN_FILE value. It is
allowed in preset files specifying version 3 or above.

binaryDir
An optional string representing the path to the output binary directory. This
field supports macro expansion. If a relative path is specified, it is calculated
relative to the source directory. If binaryDir is not specified, it must be
inherited from the inherits preset (unless this preset is hidden). In version 3 or
above, this field may be omitted.

installDir
An optional string representing the path to the installation directory. This field
supports macro expansion. If a relative path is specified, it is calculated
relative to the source directory. This is allowed in preset files specifying
version 3 or above.

cmakeExecutable
An optional string representing the path to the CMake executable to use for this
preset. This is reserved for use by IDEs, and is not used by CMake itself. IDEs
that use this field should expand any macros in it.

cacheVariables
An optional map of cache variables. The key is the variable name (which may not be
an empty string), and the value is either null, a boolean (which is equivalent to a
value of "TRUE" or "FALSE" and a type of BOOL), a string representing the value of
the variable (which supports macro expansion), or an object with the following
fields:

type An optional string representing the type of the variable.

value A required string or boolean representing the value of the variable. A
boolean is equivalent to "TRUE" or "FALSE". This field supports macro
expansion.

Cache variables are inherited through the inherits field, and the preset's
variables will be the union of its own cacheVariables and the cacheVariables from
all its parents. If multiple presets in this union define the same variable, the
standard rules of inherits are applied. Setting a variable to null causes it to not
be set, even if a value was inherited from another preset.

environment
An optional map of environment variables. The key is the variable name (which may
not be an empty string), and the value is either null or a string representing the
value of the variable. Each variable is set regardless of whether or not a value
was given to it by the process's environment. This field supports macro expansion,
and environment variables in this map may reference each other, and may be listed
in any order, as long as such references do not cause a cycle (for example, if
ENV_1 is $env{ENV_2}, ENV_2 may not be $env{ENV_1}.)

Environment variables are inherited through the inherits field, and the preset's
environment will be the union of its own environment and the environment from all
its parents. If multiple presets in this union define the same variable, the
standard rules of inherits are applied. Setting a variable to null causes it to not
be set, even if a value was inherited from another preset.

warnings
An optional object specifying the warnings to enable. The object may contain the
following fields:

dev An optional boolean. Equivalent to passing -Wdev or -Wno-dev on the command
line. This may not be set to false if errors.dev is set to true.

deprecated
An optional boolean. Equivalent to passing -Wdeprecated or -Wno-deprecated
on the command line. This may not be set to false if errors.deprecated is
set to true.

uninitialized
An optional boolean. Setting this to true is equivalent to passing
--warn-uninitialized on the command line.

unusedCli
An optional boolean. Setting this to false is equivalent to passing
--no-warn-unused-cli on the command line.

systemVars
An optional boolean. Setting this to true is equivalent to passing
--check-system-vars on the command line.

errors An optional object specifying the errors to enable. The object may contain the
following fields:

dev An optional boolean. Equivalent to passing -Werror=dev or -Wno-error=dev on
the command line. This may not be set to true if warnings.dev is set to
false.

deprecated
An optional boolean. Equivalent to passing -Werror=deprecated or
-Wno-error=deprecated on the command line. This may not be set to true if
warnings.deprecated is set to false.

debug An optional object specifying debug options. The object may contain the following
fields:

output An optional boolean. Setting this to true is equivalent to passing
--debug-output on the command line.

tryCompile
An optional boolean. Setting this to true is equivalent to passing
--debug-trycompile on the command line.

find An optional boolean. Setting this to true is equivalent to passing
--debug-find on the command line.

trace An optional object specifying trace options. This is allowed in preset files
specifying version 7. The object may contain the following fields:

mode An optional string that specifies the trace mode. Valid values are:

on Causes a trace of all calls made and from where to be printed.
Equivalent to passing --trace on the command line.

off A trace of all calls will not be printed.

expand Causes a trace with variables expanded of all calls made and from
where to be printed. Equivalent to passing --trace-expand on the
command line.

format An optional string that specifies the format output of the trace. Valid
values are:

human Prints each trace line in a human-readable format. This is the
default format. Equivalent to passing --trace-format=human on the
command line.

json-v1
Prints each line as a separate JSON document. Equivalent to passing
--trace-format=json-v1 on the command line.

source An optional array of strings representing the paths of source files to be
traced. This field can also be a string, which is equivalent to an array
containing one string. Equivalent to passing --trace-source on the command
line.

redirect
An optional string specifying a path to a trace output file. Equivalent to
passing --trace-redirect on the command line.

Build Preset
Each entry of the buildPresets array is a JSON object that may contain the following
fields:

name A required string representing the machine-friendly name of the preset. This
identifier is used in the cmake --build --preset option. There must not be two
build presets in the union of CMakePresets.json and CMakeUserPresets.json in the
same directory with the same name. However, a build preset may have the same name
as a configure, test, package, or workflow preset.

hidden An optional boolean specifying whether or not a preset should be hidden. If a
preset is hidden, it cannot be used in the --preset argument and does not have to
have a valid configurePreset, even from inheritance. hidden presets are intended to
be used as a base for other presets to inherit via the inherits field.

inherits
An optional array of strings representing the names of presets to inherit from.
This field can also be a string, which is equivalent to an array containing one
string.

condition
An optional Condition object. This is allowed in preset files specifying version 3
or above.

displayName
An optional string with a human-friendly name of the preset.

description
An optional string with a human-friendly description of the preset.

NOTE:
For a CMake project using ExternalProject with a configuration preset having
environment variables needed in the ExternalProject, use a build preset that
inherits that configuration preset or the ExternalProject will not have the
environment variables set in the configuration preset. Example: suppose the
host defaults to one compiler (say Clang) and the user wishes to use another
compiler (say GCC). Set configuration preset environment variables CC and CXX
and use a build preset that inherits that configuration preset. Otherwise the
ExternalProject may use a different (system default) compiler than the top-level
CMake project.

configurePreset
An optional string specifying the name of a configure preset to associate with this
build preset. If configurePreset is not specified, it must be inherited from the
inherits preset (unless this preset is hidden). The build directory is inferred
from the configure preset, so the build will take place in the same binaryDir that
the configuration did.

inheritConfigureEnvironment
An optional boolean that defaults to true. If true, the environment variables from
the associated configure preset are inherited after all inherited build preset
environments, but before environment variables explicitly specified in this build
preset.

jobs An optional integer. Equivalent to passing --parallel or -j on the command line.

targets
An optional string or array of strings. Equivalent to passing --target or -t on the
command line. Vendors may ignore the targets property or hide build presets that
explicitly specify targets. This field supports macro expansion.

configuration
An optional string. Equivalent to passing --config on the command line.

cleanFirst
An optional bool. If true, equivalent to passing --clean-first on the command line.

resolvePackageReferences
An optional string that specifies the package resolve mode. This is allowed in
preset files specifying version 4 or above.

Package references are used to define dependencies to packages from external
package managers. Currently only NuGet in combination with the Visual Studio
generator is supported. If there are no targets that define package references,
this option does nothing. Valid values are:

on Causes package references to be resolved before attempting a build.

off Package references will not be resolved. Note that this may cause errors in
some build environments, such as .NET SDK style projects.

only Only resolve package references, but do not perform a build.

NOTE:
The command line parameter --resolve-package-references will take priority over
this setting. If the command line parameter is not provided and this setting is
not specified, an environment-specific cache variable will be evaluated to
decide, if package restoration should be performed.

When using the Visual Studio generator, package references are defined using the
VS_PACKAGE_REFERENCES property. Package references are restored using NuGet. It
can be disabled by setting the CMAKE_VS_NUGET_PACKAGE_RESTORE variable to OFF.
This can also be done from within a configure preset.

verbose
An optional bool. If true, equivalent to passing --verbose on the command line.

nativeToolOptions
An optional array of strings. Equivalent to passing options after -- on the command
line. The array values support macro expansion.

Test Preset
Each entry of the testPresets array is a JSON object that may contain the following
fields:

name A required string representing the machine-friendly name of the preset. This
identifier is used in the ctest --preset option. There must not be two test
presets in the union of CMakePresets.json and CMakeUserPresets.json in the same
directory with the same name. However, a test preset may have the same name as a
configure, build, package, or workflow preset.

inherits
An optional array of strings representing the names of presets to inherit from.
This field can also be a string, which is equivalent to an array containing one
string.

condition
An optional Condition object. This is allowed in preset files specifying version 3
or above.

displayName
An optional string with a human-friendly name of the preset.

description
An optional string with a human-friendly description of the preset.

configurePreset
An optional string specifying the name of a configure preset to associate with this
test preset. If configurePreset is not specified, it must be inherited from the
inherits preset (unless this preset is hidden). The build directory is inferred
from the configure preset, so tests will run in the same binaryDir that the
configuration did and build did.

inheritConfigureEnvironment
An optional boolean that defaults to true. If true, the environment variables from
the associated configure preset are inherited after all inherited test preset
environments, but before environment variables explicitly specified in this test
preset.

configuration
An optional string. Equivalent to passing --build-config on the command line.

overwriteConfigurationFile
An optional array of configuration options to overwrite options specified in the
CTest configuration file. Equivalent to passing --overwrite for each value in the
array. The array values support macro expansion.

output An optional object specifying output options. The object may contain the following
fields.

shortProgress
An optional bool. If true, equivalent to passing --progress on the command
line.

verbosity
An optional string specifying verbosity level. Must be one of the following:

default
Equivalent to passing no verbosity flags on the command line.

verbose
Equivalent to passing --verbose on the command line.

extra Equivalent to passing --extra-verbose on the command line.

debug An optional bool. If true, equivalent to passing --debug on the command
line.

outputOnFailure
An optional bool. If true, equivalent to passing --output-on-failure on the
command line.

quiet An optional bool. If true, equivalent to passing --quiet on the command
line.

outputLogFile
An optional string specifying a path to a log file. Equivalent to passing
--output-log on the command line. This field supports macro expansion.

outputJUnitFile
An optional string specifying a path to a JUnit file. Equivalent to passing
--output-junit on the command line. This field supports macro expansion.
This is allowed in preset files specifying version 6 or above.

labelSummary
An optional bool. If false, equivalent to passing --no-label-summary on the
command line.

subprojectSummary
An optional bool. If false, equivalent to passing --no-subproject-summary on
the command line.

maxPassedTestOutputSize
An optional integer specifying the maximum output for passed tests in bytes.
Equivalent to passing --test-output-size-passed on the command line.

maxFailedTestOutputSize
An optional integer specifying the maximum output for failed tests in bytes.
Equivalent to passing --test-output-size-failed on the command line.

testOutputTruncation
An optional string specifying the test output truncation mode. Equivalent to
passing --test-output-truncation on the command line. This is allowed in
preset files specifying version 5 or above.

maxTestNameWidth
An optional integer specifying the maximum width of a test name to output.
Equivalent to passing --max-width on the command line.

filter An optional object specifying how to filter the tests to run. The object may
contain the following fields.

include
An optional object specifying which tests to include. The object may contain
the following fields.

name An optional string specifying a regex for test names. Equivalent to
passing --tests-regex on the command line. This field supports macro
expansion. CMake regex syntax is described under string(REGEX).

label An optional string specifying a regex for test labels. Equivalent to
passing --label-regex on the command line. This field supports macro
expansion.

useUnion
An optional bool. Equivalent to passing --union on the command line.

index An optional object specifying tests to include by test index. The
object may contain the following fields. Can also be an optional
string specifying a file with the command line syntax for
--tests-information. If specified as a string, this field supports
macro expansion.

start An optional integer specifying a test index to start testing
at.

end An optional integer specifying a test index to stop testing
at.

stride An optional integer specifying the increment.

specificTests
An optional array of integers specifying specific test indices
to run.

exclude
An optional object specifying which tests to exclude. The object may contain
the following fields.

name An optional string specifying a regex for test names. Equivalent to
passing --exclude-regex on the command line. This field supports
macro expansion.

label An optional string specifying a regex for test labels. Equivalent to
passing --label-exclude on the command line. This field supports
macro expansion.

fixtures
An optional object specifying which fixtures to exclude from adding
tests. The object may contain the following fields.

any An optional string specifying a regex for text fixtures to
exclude from adding any tests. Equivalent to
--fixture-exclude-any on the command line. This field supports
macro expansion.

setup An optional string specifying a regex for text fixtures to
exclude from adding setup tests. Equivalent to
--fixture-exclude-setup on the command line. This field
supports macro expansion.

cleanup
An optional string specifying a regex for text fixtures to
exclude from adding cleanup tests. Equivalent to
--fixture-exclude-cleanup on the command line. This field
supports macro expansion.

execution
An optional object specifying options for test execution. The object may contain
the following fields.

stopOnFailure
An optional bool. If true, equivalent to passing --stop-on-failure on the
command line.

enableFailover
An optional bool. If true, equivalent to passing -F on the command line.

jobs An optional integer. Equivalent to passing --parallel on the command line.

resourceSpecFile
An optional string. Equivalent to passing --resource-spec-file on the
command line. This field supports macro expansion.

testLoad
An optional integer. Equivalent to passing --test-load on the command line.

showOnly
An optional string. Equivalent to passing --show-only on the command line.
The string must be one of the following values:

human

json-v1

repeat An optional object specifying how to repeat tests. Equivalent to passing
--repeat on the command line. The object must have the following fields.

mode A required string. Must be one of the following values:

until-fail

until-pass

after-timeout

count A required integer.

interactiveDebugging
An optional bool. If true, equivalent to passing --interactive-debug-mode 1
on the command line. If false, equivalent to passing
--interactive-debug-mode 0 on the command line.

scheduleRandom
An optional bool. If true, equivalent to passing --schedule-random on the
command line.

timeout
An optional integer. Equivalent to passing --timeout on the command line.

noTestsAction
An optional string specifying the behavior if no tests are found. Must be
one of the following values:

default
Equivalent to not passing any value on the command line.

error Equivalent to passing --no-tests=error on the command line.

ignore Equivalent to passing --no-tests=ignore on the command line.

Package Preset
Package presets may be used in schema version 6 or above. Each entry of the packagePresets
array is a JSON object that may contain the following fields:

name A required string representing the machine-friendly name of the preset. This
identifier is used in the cpack --preset option. There must not be two package
presets in the union of CMakePresets.json and CMakeUserPresets.json in the same
directory with the same name. However, a package preset may have the same name as
a configure, build, test, or workflow preset.

inherits
An optional array of strings representing the names of presets to inherit from.
This field can also be a string, which is equivalent to an array containing one
string.

condition
An optional Condition object.

displayName
An optional string with a human-friendly name of the preset.

description
An optional string with a human-friendly description of the preset.

configurePreset
An optional string specifying the name of a configure preset to associate with this
package preset. If configurePreset is not specified, it must be inherited from the
inherits preset (unless this preset is hidden). The build directory is inferred
from the configure preset, so packaging will run in the same binaryDir that the
configuration did and build did.

inheritConfigureEnvironment
An optional boolean that defaults to true. If true, the environment variables from
the associated configure preset are inherited after all inherited package preset
environments, but before environment variables explicitly specified in this package
preset.

generators
An optional array of strings representing generators for CPack to use.

configurations
An optional array of strings representing build configurations for CPack to
package.

variables
An optional map of variables to pass to CPack, equivalent to -D arguments. Each key
is the name of a variable, and the value is the string to assign to that variable.

configFile
An optional string representing the config file for CPack to use.

output An optional object specifying output options. Valid keys are:

debug An optional boolean specifying whether or not to print debug information. A
value of true is equivalent to passing --debug on the command line.

verbose
An optional boolean specifying whether or not to print verbosely. A value of
true is equivalent to passing --verbose on the command line.

packageName
An optional string representing the package name.

packageVersion
An optional string representing the package version.

packageDirectory
An optional string representing the directory in which to place the package.

vendorName
An optional string representing the vendor name.

Workflow Preset
Workflow presets may be used in schema version 6 or above. Each entry of the
workflowPresets array is a JSON object that may contain the following fields:

name A required string representing the machine-friendly name of the preset. This
identifier is used in the cmake --workflow --preset option. There must not be two
workflow presets in the union of CMakePresets.json and CMakeUserPresets.json in the
same directory with the same name. However, a workflow preset may have the same
name as a configure, build, test, or package preset.

displayName
An optional string with a human-friendly name of the preset.

description
An optional string with a human-friendly description of the preset.

steps A required array of objects describing the steps of the workflow. The first step
must be a configure preset, and all subsequent steps must be non- configure presets
whose configurePreset field matches the starting configure preset. Each object may
contain the following fields:

type A required string. The first step must be configure. Subsequent steps must
be either build, test, or package.

name A required string representing the name of the configure, build, test, or
package preset to run as this workflow step.

Condition
The condition field of a preset, allowed in preset files specifying version 3 or above, is
used to determine whether or not the preset is enabled. For example, this can be used to
disable a preset on platforms other than Windows. condition may be either a boolean,
null, or an object. If it is a boolean, the boolean indicates whether the preset is
enabled or disabled. If it is null, the preset is enabled, but the null condition is not
inherited by any presets that may inherit from the preset. Sub-conditions (for example in
a not, anyOf, or allOf condition) may not be null. If it is an object, it has the
following fields:

type A required string with one of the following values:

"const"
Indicates that the condition is constant. This is equivalent to using a
boolean in place of the object. The condition object will have the following
additional fields:

value A required boolean which provides a constant value for the
condition's evaluation.

"equals"

"notEquals"
Indicates that the condition compares two strings to see if they are equal
(or not equal). The condition object will have the following additional
fields:

lhs First string to compare. This field supports macro expansion.

rhs Second string to compare. This field supports macro expansion.

"inList"

"notInList"
Indicates that the condition searches for a string in a list of strings.
The condition object will have the following additional fields:

string A required string to search for. This field supports macro expansion.

list A required array of strings to search. This field supports macro
expansion, and uses short-circuit evaluation.

"matches"

"notMatches"
Indicates that the condition searches for a regular expression in a string.
The condition object will have the following additional fields:

string A required string to search. This field supports macro expansion.

regex A required regular expression to search for. This field supports
macro expansion.

"anyOf"

"allOf"
Indicates that the condition is an aggregation of zero or more nested
conditions. The condition object will have the following additional fields:

conditions
A required array of condition objects. These conditions use short-circuit
evaluation.

"not" Indicates that the condition is an inversion of another condition. The
condition object will have the following additional fields:

condition
A required condition object.

Macro Expansion
As mentioned above, some fields support macro expansion. Macros are recognized in the form
$<macro-namespace>{<macro-name>}. All macros are evaluated in the context of the preset
being used, even if the macro is in a field that was inherited from another preset. For
example, if the Base preset sets variable PRESET_NAME to ${presetName}, and the Derived
preset inherits from Base, PRESET_NAME will be set to Derived.

It is an error to not put a closing brace at the end of a macro name. For example,
${sourceDir is invalid. A dollar sign ($) followed by anything other than a left curly
brace ({) with a possible namespace is interpreted as a literal dollar sign.

Recognized macros include:

${sourceDir}
Path to the project source directory (i.e. the same as CMAKE_SOURCE_DIR).

${sourceParentDir}
Path to the project source directory's parent directory.

${sourceDirName}
The last filename component of ${sourceDir}. For example, if ${sourceDir} is
/path/to/source, this would be source.

${presetName}
Name specified in the preset's name field.

${generator}
Generator specified in the preset's generator field. For build and test presets,
this will evaluate to the generator specified by configurePreset.

${hostSystemName}
The name of the host operating system. Contains the same value as
CMAKE_HOST_SYSTEM_NAME. This is allowed in preset files specifying version 3 or
above.

${fileDir}
Path to the directory containing the preset file which contains the macro. This is
allowed in preset files specifying version 4 or above.

${dollar}
A literal dollar sign ($).

${pathListSep}
Native character for separating lists of paths, such as : or ;.

For example, by setting PATH to /path/to/ninja/bin${pathListSep}$env{PATH},
${pathListSep} will expand to the underlying operating system's character used for
concatenation in PATH.

This is allowed in preset files specifying version 5 or above.

$env{<variable-name>}
Environment variable with name <variable-name>. The variable name may not be an
empty string. If the variable is defined in the environment field, that value is
used instead of the value from the parent environment. If the environment variable
is not defined, this evaluates as an empty string.

Note that while Windows environment variable names are case-insensitive, variable
names within a preset are still case-sensitive. This may lead to unexpected results
when using inconsistent casing. For best results, keep the casing of environment
variable names consistent.

$penv{<variable-name>}
Similar to $env{<variable-name>}, except that the value only comes from the parent
environment, and never from the environment field. This allows you to prepend or
append values to existing environment variables. For example, setting PATH to
/path/to/ninja/bin:$penv{PATH} will prepend /path/to/ninja/bin to the PATH
environment variable. This is needed because $env{<variable-name>} does not allow
circular references.

$vendor{<macro-name>}
An extension point for vendors to insert their own macros. CMake will not be able
to use presets which have a $vendor{<macro-name>} macro, and effectively ignores
such presets. However, it will still be able to use other presets from the same
file.

CMake does not make any attempt to interpret $vendor{<macro-name>} macros. However,
to avoid name collisions, IDE vendors should prefix <macro-name> with a very short
(preferably <= 4 characters) vendor identifier prefix, followed by a ., followed by
the macro name. For example, the Example IDE could have
$vendor{xide.ideInstallDir}.

SCHEMA

       This file provides a machine-readable JSON schema for the CMakePresets.json format.

COPYRIGHT

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