Ubuntu Manpage: cmake-file-api - CMake File-Based API

name
introduction
api v1
object kinds
copyright

NAME

       cmake-file-api - CMake File-Based API

INTRODUCTION

       CMake  provides  a file-based API that clients may use to get semantic information about the buildsystems
       CMake generates.  Clients may use the API by writing query files to a specific location in a  build  tree
       to  request  zero  or more Object Kinds.  When CMake generates the buildsystem in that build tree it will
       read the query files and write reply files for the client to read.

       The file-based API uses a <build>/.cmake/api/ directory at the top of a build tree.  The API is versioned
       to  support  changes  to  the  layout  of  files within the API directory.  API file layout versioning is
       orthogonal to the versioning of Object Kinds used in replies.  This version of CMake  supports  only  one
       API version, API v1.

       Added  in  version  3.27: Projects may also submit queries for the current run using the cmake_file_api()
       command.

API V1

API v1 is housed in the <build>/.cmake/api/v1/ directory. It has the following subdirectories:

query/ Holds query files written by clients. These may be v1 Shared Stateless Query Files, v1 Client
Stateless Query Files, or v1 Client Stateful Query Files.

reply/ Holds reply files written by CMake whenever it runs to generate a build system. These are indexed
by a v1 Reply Index File file that may reference additional v1 Reply Files. CMake owns all reply
files. Clients must never remove them.

Clients may look for and read a reply index file at any time. Clients may optionally create the
reply/ directory at any time and monitor it for the appearance of a new reply index file.

v1 Shared Stateless Query Files
Shared stateless query files allow clients to share requests for major versions of the Object Kinds and
get all requested versions recognized by the CMake that runs.

Clients may create shared requests by creating empty files in the v1/query/ directory. The form is:

<build>/.cmake/api/v1/query/<kind>-v<major>

where <kind> is one of the Object Kinds, -v is literal, and <major> is the major version number.

Files of this form are stateless shared queries not owned by any specific client. Once created they
should not be removed without external client coordination or human intervention.

v1 Client Stateless Query Files
Client stateless query files allow clients to create owned requests for major versions of the Object
Kinds and get all requested versions recognized by the CMake that runs.

Clients may create owned requests by creating empty files in client-specific query subdirectories. The
form is:

<build>/.cmake/api/v1/query/client-<client>/<kind>-v<major>

where client- is literal, <client> is a string uniquely identifying the client, <kind> is one of the
Object Kinds, -v is literal, and <major> is the major version number. Each client must choose a unique
<client> identifier via its own means.

Files of this form are stateless queries owned by the client <client>. The owning client may remove them
at any time.

v1 Client Stateful Query Files
Stateful query files allow clients to request a list of versions of each of the Object Kinds and get only
the most recent version recognized by the CMake that runs.

Clients may create owned stateful queries by creating query.json files in client-specific query
subdirectories. The form is:

<build>/.cmake/api/v1/query/client-<client>/query.json

where client- is literal, <client> is a string uniquely identifying the client, and query.json is
literal. Each client must choose a unique <client> identifier via its own means.

query.json files are stateful queries owned by the client <client>. The owning client may update or
remove them at any time. When a given client installation is updated it may then update the stateful
query it writes to build trees to request newer object versions. This can be used to avoid asking CMake
to generate multiple object versions unnecessarily.

A query.json file must contain a JSON object:

{
"requests": [
{ "kind": "<kind>" , "version": 1 },
{ "kind": "<kind>" , "version": { "major": 1, "minor": 2 } },
{ "kind": "<kind>" , "version": [2, 1] },
{ "kind": "<kind>" , "version": [2, { "major": 1, "minor": 2 }] },
{ "kind": "<kind>" , "version": 1, "client": {} },
{ "kind": "..." }
],
"client": {}
}

The members are:

requests
A JSON array containing zero or more requests. Each request is a JSON object with members:

kind Specifies one of the Object Kinds to be included in the reply.

version
Indicates the version(s) of the object kind that the client understands. Versions have
major and minor components following semantic version conventions. The value must be

• a JSON integer specifying a (non-negative) major version number, or

• a JSON object containing major and (optionally) minor members specifying non-negative
integer version components, or

• a JSON array whose elements are each one of the above.

client Optional member reserved for use by the client. This value is preserved in the reply
written for the client in the v1 Reply Index File but is otherwise ignored. Clients may
use this to pass custom information with a request through to its reply.

For each requested object kind CMake will choose the first version that it recognizes for that
kind among those listed in the request. The response will use the selected major version with the
highest minor version known to the running CMake for that major version. Therefore clients should
list all supported major versions in preferred order along with the minimal minor version required
for each major version.

client Optional member reserved for use by the client. This value is preserved in the reply written for
the client in the v1 Reply Index File but is otherwise ignored. Clients may use this to pass
custom information with a query through to its reply.

Other query.json top-level members are reserved for future use. If present they are ignored for forward
compatibility.

v1 Reply Index File
CMake writes an index-*.json file to the v1/reply/ directory whenever it runs to generate a build system.
Clients must read the reply index file first and may read other v1 Reply Files only by following
references. The form of the reply index file name is:

<build>/.cmake/api/v1/reply/index-<unspecified>.json

where index- is literal and <unspecified> is an unspecified name selected by CMake. Whenever a new index
file is generated it is given a new name and any old one is deleted. During the short time between these
steps there may be multiple index files present; the one with the largest name in lexicographic order is
the current index file.

The reply index file contains a JSON object:

{
"cmake": {
"version": {
"major": 3, "minor": 14, "patch": 0, "suffix": "",
"string": "3.14.0", "isDirty": false
},
"paths": {
"cmake": "/prefix/bin/cmake",
"ctest": "/prefix/bin/ctest",
"cpack": "/prefix/bin/cpack",
"root": "/prefix/share/cmake-3.14"
},
"generator": {
"multiConfig": false,
"name": "Unix Makefiles"
}
},
"objects": [
{ "kind": "<kind>",
"version": { "major": 1, "minor": 0 },
"jsonFile": "<file>" },
{ "...": "..." }
],
"reply": {
"<kind>-v<major>": { "kind": "<kind>",
"version": { "major": 1, "minor": 0 },
"jsonFile": "<file>" },
"<unknown>": { "error": "unknown query file" },
"...": {},
"client-<client>": {
"<kind>-v<major>": { "kind": "<kind>",
"version": { "major": 1, "minor": 0 },
"jsonFile": "<file>" },
"<unknown>": { "error": "unknown query file" },
"...": {},
"query.json": {
"requests": [ {}, {}, {} ],
"responses": [
{ "kind": "<kind>",
"version": { "major": 1, "minor": 0 },
"jsonFile": "<file>" },
{ "error": "unknown query file" },
{ "...": {} }
],
"client": {}
}
}
}
}

The members are:

cmake A JSON object containing information about the instance of CMake that generated the reply. It
contains members:

version
A JSON object specifying the version of CMake with members:

major, minor, patch
Integer values specifying the major, minor, and patch version components.

suffix A string specifying the version suffix, if any, e.g. g0abc3.

string A string specifying the full version in the format
<major>.<minor>.<patch>[-<suffix>].

isDirty
A boolean indicating whether the version was built from a version controlled source
tree with local modifications.

paths A JSON object specifying paths to things that come with CMake. It has members for cmake,
ctest, and cpack whose values are JSON strings specifying the absolute path to each tool,
represented with forward slashes. It also has a root member for the absolute path to the
directory containing CMake resources like the Modules/ directory (see CMAKE_ROOT).

generator
A JSON object describing the CMake generator used for the build. It has members:

multiConfig
A boolean specifying whether the generator supports multiple output configurations.

name A string specifying the name of the generator.

platform
If the generator supports CMAKE_GENERATOR_PLATFORM, this is a string specifying the
generator platform name.

objects
A JSON array listing all versions of all Object Kinds generated as part of the reply. Each array
entry is a v1 Reply File Reference.

reply A JSON object mirroring the content of the query/ directory that CMake loaded to produce the
reply. The members are of the form

<kind>-v<major>
A member of this form appears for each of the v1 Shared Stateless Query Files that CMake
recognized as a request for object kind <kind> with major version <major>. The value is a
v1 Reply File Reference to the corresponding reply file for that object kind and version.

<unknown>
A member of this form appears for each of the v1 Shared Stateless Query Files that CMake
did not recognize. The value is a JSON object with a single error member containing a
string with an error message indicating that the query file is unknown.

client-<client>
A member of this form appears for each client-owned directory holding v1 Client Stateless
Query Files. The value is a JSON object mirroring the content of the
query/client-<client>/ directory. The members are of the form:

<kind>-v<major>
A member of this form appears for each of the v1 Client Stateless Query Files that
CMake recognized as a request for object kind <kind> with major version <major>.
The value is a v1 Reply File Reference to the corresponding reply file for that
object kind and version.

<unknown>
A member of this form appears for each of the v1 Client Stateless Query Files that
CMake did not recognize. The value is a JSON object with a single error member
containing a string with an error message indicating that the query file is unknown.

query.json
This member appears for clients using v1 Client Stateful Query Files. If the
query.json file failed to read or parse as a JSON object, this member is a JSON
object with a single error member containing a string with an error message.
Otherwise, this member is a JSON object mirroring the content of the query.json
file. The members are:

client A copy of the query.json file client member, if it exists.

requests
A copy of the query.json file requests member, if it exists.

responses
If the query.json file requests member is missing or invalid, this member is
a JSON object with a single error member containing a string with an error
message. Otherwise, this member contains a JSON array with a response for
each entry of the requests array, in the same order. Each response is

• a JSON object with a single error member containing a string with an error
message, or

• a v1 Reply File Reference to the corresponding reply file for the requested
object kind and selected version.

After reading the reply index file, clients may read the other v1 Reply Files it references.

v1 Reply File Reference
The reply index file represents each reference to another reply file using a JSON object with members:

kind A string specifying one of the Object Kinds.

version
A JSON object with members major and minor specifying integer version components of the object
kind.

jsonFile
A JSON string specifying a path relative to the reply index file to another JSON file containing
the object.

v1 Reply Files
Reply files containing specific Object Kinds are written by CMake. The names of these files are
unspecified and must not be interpreted by clients. Clients must first read the v1 Reply Index File and
follow references to the names of the desired response objects.

Reply files (including the index file) will never be replaced by files of the same name but different
content. This allows a client to read the files concurrently with a running CMake that may generate a
new reply. However, after generating a new reply CMake will attempt to remove reply files from previous
runs that it did not just write. If a client attempts to read a reply file referenced by the index but
finds the file missing, that means a concurrent CMake has generated a new reply. The client may simply
start again by reading the new reply index file.

OBJECT KINDS

The CMake file-based API reports semantic information about the build system using the following kinds of
JSON objects. Each kind of object is versioned independently using semantic versioning with major and
minor components. Every kind of object has the form:

{
"kind": "<kind>",
"version": { "major": 1, "minor": 0 },
"...": {}
}

The kind member is a string specifying the object kind name. The version member is a JSON object with
major and minor members specifying integer components of the object kind's version. Additional top-level
members are specific to each object kind.

Object Kind "codemodel"
The codemodel object kind describes the build system structure as modeled by CMake.

There is only one codemodel object major version, version 2. Version 1 does not exist to avoid confusion
with that from cmake-server(7) mode.

"codemodel" version 2
codemodel object version 2 is a JSON object:

{
"kind": "codemodel",
"version": { "major": 2, "minor": 7 },
"paths": {
"source": "/path/to/top-level-source-dir",
"build": "/path/to/top-level-build-dir"
},
"configurations": [
{
"name": "Debug",
"directories": [
{
"source": ".",
"build": ".",
"childIndexes": [ 1 ],
"projectIndex": 0,
"targetIndexes": [ 0 ],
"hasInstallRule": true,
"minimumCMakeVersion": {
"string": "3.14"
},
"jsonFile": "<file>"
},
{
"source": "sub",
"build": "sub",
"parentIndex": 0,
"projectIndex": 0,
"targetIndexes": [ 1 ],
"minimumCMakeVersion": {
"string": "3.14"
},
"jsonFile": "<file>"
}
],
"projects": [
{
"name": "MyProject",
"directoryIndexes": [ 0, 1 ],
"targetIndexes": [ 0, 1 ]
}
],
"targets": [
{
"name": "MyExecutable",
"directoryIndex": 0,
"projectIndex": 0,
"jsonFile": "<file>"
},
{
"name": "MyLibrary",
"directoryIndex": 1,
"projectIndex": 0,
"jsonFile": "<file>"
}
]
}
]
}

The members specific to codemodel objects are:

paths A JSON object containing members:

source A string specifying the absolute path to the top-level source directory, represented with
forward slashes.

build A string specifying the absolute path to the top-level build directory, represented with
forward slashes.

configurations
A JSON array of entries corresponding to available build configurations. On single-configuration
generators there is one entry for the value of the CMAKE_BUILD_TYPE variable. For
multi-configuration generators there is an entry for each configuration listed in the
CMAKE_CONFIGURATION_TYPES variable. Each entry is a JSON object containing members:

name A string specifying the name of the configuration, e.g. Debug.

directories
A JSON array of entries each corresponding to a build system directory whose source
directory contains a CMakeLists.txt file. The first entry corresponds to the top-level
directory. Each entry is a JSON object containing members:

source A string specifying the path to the source directory, represented with forward
slashes. If the directory is inside the top-level source directory then the path is
specified relative to that directory (with . for the top-level source directory
itself). Otherwise the path is absolute.

build A string specifying the path to the build directory, represented with forward
slashes. If the directory is inside the top-level build directory then the path is
specified relative to that directory (with . for the top-level build directory
itself). Otherwise the path is absolute.

parentIndex
Optional member that is present when the directory is not top-level. The value is
an unsigned integer 0-based index of another entry in the main directories array
that corresponds to the parent directory that added this directory as a
subdirectory.

childIndexes
Optional member that is present when the directory has subdirectories. The value is
a JSON array of entries corresponding to child directories created by the
add_subdirectory() or subdirs() command. Each entry is an unsigned integer 0-based
index of another entry in the main directories array.

projectIndex
An unsigned integer 0-based index into the main projects array indicating the build
system project to which the this directory belongs.

targetIndexes
Optional member that is present when the directory itself has targets, excluding
those belonging to subdirectories. The value is a JSON array of entries
corresponding to the targets. Each entry is an unsigned integer 0-based index into
the main targets array.

minimumCMakeVersion
Optional member present when a minimum required version of CMake is known for the
directory. This is the <min> version given to the most local call to the
cmake_minimum_required(VERSION) command in the directory itself or one of its
ancestors. The value is a JSON object with one member:

string A string specifying the minimum required version in the format:

<major>.<minor>[.<patch>[.<tweak>]][<suffix>]

Each component is an unsigned integer and the suffix may be an arbitrary
string.

hasInstallRule
Optional member that is present with boolean value true when the directory or one of
its subdirectories contains any install() rules, i.e. whether a make install or
equivalent rule is available.

jsonFile
A JSON string specifying a path relative to the codemodel file to another JSON file
containing a "codemodel" version 2 "directory" object.

This field was added in codemodel version 2.3.

projects
A JSON array of entries corresponding to the top-level project and sub-projects defined in
the build system. Each (sub-)project corresponds to a source directory whose
CMakeLists.txt file calls the project() command with a project name different from its
parent directory. The first entry corresponds to the top-level project.

Each entry is a JSON object containing members:

name A string specifying the name given to the project() command.

parentIndex
Optional member that is present when the project is not top-level. The value is an
unsigned integer 0-based index of another entry in the main projects array that
corresponds to the parent project that added this project as a sub-project.

childIndexes
Optional member that is present when the project has sub-projects. The value is a
JSON array of entries corresponding to the sub-projects. Each entry is an unsigned
integer 0-based index of another entry in the main projects array.

directoryIndexes
A JSON array of entries corresponding to build system directories that are part of
the project. The first entry corresponds to the top-level directory of the project.
Each entry is an unsigned integer 0-based index into the main directories array.

targetIndexes
Optional member that is present when the project itself has targets, excluding those
belonging to sub-projects. The value is a JSON array of entries corresponding to
the targets. Each entry is an unsigned integer 0-based index into the main targets
array.

targets
A JSON array of entries corresponding to the build system targets. Such targets are
created by calls to add_executable(), add_library(), and add_custom_target(), excluding
imported targets and interface libraries (which do not generate any build rules). Each
entry is a JSON object containing members:

name A string specifying the target name.

id A string uniquely identifying the target. This matches the id field in the file
referenced by jsonFile.

directoryIndex
An unsigned integer 0-based index into the main directories array indicating the
build system directory in which the target is defined.

projectIndex
An unsigned integer 0-based index into the main projects array indicating the build
system project in which the target is defined.

jsonFile
A JSON string specifying a path relative to the codemodel file to another JSON file
containing a "codemodel" version 2 "target" object.

"codemodel" version 2 "directory" object
A codemodel "directory" object is referenced by a "codemodel" version 2 object's directories array. Each
"directory" object is a JSON object with members:

paths A JSON object containing members:

source A string specifying the path to the source directory, represented with forward slashes. If
the directory is inside the top-level source directory then the path is specified relative
to that directory (with . for the top-level source directory itself). Otherwise the path
is absolute.

build A string specifying the path to the build directory, represented with forward slashes. If
the directory is inside the top-level build directory then the path is specified relative
to that directory (with . for the top-level build directory itself). Otherwise the path is
absolute.

installers
A JSON array of entries corresponding to install() rules. Each entry is a JSON object containing
members:

component
A string specifying the component selected by the corresponding install() command
invocation.

destination
Optional member that is present for specific type values below. The value is a string
specifying the install destination path. The path may be absolute or relative to the
install prefix.

paths Optional member that is present for specific type values below. The value is a JSON array
of entries corresponding to the paths (files or directories) to be installed. Each entry
is one of:

• A string specifying the path from which a file or directory is to be installed. The
portion of the path not preceded by a / also specifies the path (name) to which the file
or directory is to be installed under the destination.

• A JSON object with members:

from A string specifying the path from which a file or directory is to be installed.

to A string specifying the path to which the file or directory is to be installed
under the destination.

In both cases the paths are represented with forward slashes. If the "from" path is inside
the top-level directory documented by the corresponding type value, then the path is
specified relative to that directory. Otherwise the path is absolute.

type A string specifying the type of installation rule. The value is one of the following, with
some variants providing additional members:

file An install(FILES) or install(PROGRAMS) call. The destination and paths members are
populated, with paths under the top-level source directory expressed relative to it.
The isOptional member may exist. This type has no additional members.

directory
An install(DIRECTORY) call. The destination and paths members are populated, with
paths under the top-level source directory expressed relative to it. The isOptional
member may exist. This type has no additional members.

target An install(TARGETS) call. The destination and paths members are populated, with
paths under the top-level build directory expressed relative to it. The isOptional
member may exist. This type has additional members targetId, targetIndex,
targetIsImportLibrary, and targetInstallNamelink.

export An install(EXPORT) call. The destination and paths members are populated, with
paths under the top-level build directory expressed relative to it. The paths
entries refer to files generated automatically by CMake for installation, and their
actual values are considered private implementation details. This type has
additional members exportName and exportTargets.

script An install(SCRIPT) call. This type has additional member scriptFile.

code An install(CODE) call. This type has no additional members.

importedRuntimeArtifacts
An install(IMPORTED_RUNTIME_ARTIFACTS) call. The destination member is populated.
The isOptional member may exist. This type has no additional members.

runtimeDependencySet
An install(RUNTIME_DEPENDENCY_SET) call or an install(TARGETS) call with
RUNTIME_DEPENDENCIES. The destination member is populated. This type has additional
members runtimeDependencySetName and runtimeDependencySetType.

fileSet
An install(TARGETS) call with FILE_SET. The destination and paths members are
populated. The isOptional member may exist. This type has additional members
fileSetName, fileSetType, fileSetDirectories, and fileSetTarget.

This type was added in codemodel version 2.4.

isExcludeFromAll
Optional member that is present with boolean value true when install() is called with the
EXCLUDE_FROM_ALL option.

isForAllComponents
Optional member that is present with boolean value true when install(SCRIPT|CODE) is called
with the ALL_COMPONENTS option.

isOptional
Optional member that is present with boolean value true when install() is called with the
OPTIONAL option. This is allowed when type is file, directory, or target.

targetId
Optional member that is present when type is target. The value is a string uniquely
identifying the target to be installed. This matches the id member of the target in the
main "codemodel" object's targets array.

targetIndex
Optional member that is present when type is target. The value is an unsigned integer
0-based index into the main "codemodel" object's targets array for the target to be
installed.

targetIsImportLibrary
Optional member that is present when type is target and the installer is for a Windows DLL
import library file or for an AIX linker import file. If present, it has boolean value
true.

targetInstallNamelink
Optional member that is present when type is target and the installer corresponds to a
target that may use symbolic links to implement the VERSION and SOVERSION target
properties. The value is a string indicating how the installer is supposed to handle the
symlinks: skip means the installer should skip the symlinks and install only the real file,
and only means the installer should install only the symlinks and not the real file. In
all cases the paths member lists what it actually installs.

exportName
Optional member that is present when type is export. The value is a string specifying the
name of the export.

exportTargets
Optional member that is present when type is export. The value is a JSON array of entries
corresponding to the targets included in the export. Each entry is a JSON object with
members:

id A string uniquely identifying the target. This matches the id member of the target
in the main "codemodel" object's targets array.

index An unsigned integer 0-based index into the main "codemodel" object's targets array
for the target.

runtimeDependencySetName
Optional member that is present when type is runtimeDependencySet and the installer was
created by an install(RUNTIME_DEPENDENCY_SET) call. The value is a string specifying the
name of the runtime dependency set that was installed.

runtimeDependencySetType
Optional member that is present when type is runtimeDependencySet. The value is a string
with one of the following values:

library
Indicates that this installer installs dependencies that are not macOS frameworks.

framework
Indicates that this installer installs dependencies that are macOS frameworks.

fileSetName
Optional member that is present when type is fileSet. The value is a string with the name
of the file set.

This field was added in codemodel version 2.4.

fileSetType
Optional member that is present when type is fileSet. The value is a string with the type
of the file set.

This field was added in codemodel version 2.4.

fileSetDirectories
Optional member that is present when type is fileSet. The value is a list of strings with
the file set's base directories (determined by genex-evaluation of HEADER_DIRS or
HEADER_DIRS_<NAME>).

This field was added in codemodel version 2.4.

fileSetTarget
Optional member that is present when type is fileSet. The value is a JSON object with
members:

id A string uniquely identifying the target. This matches the id member of the target
in the main "codemodel" object's targets array.

index An unsigned integer 0-based index into the main "codemodel" object's targets array
for the target.

This field was added in codemodel version 2.4.

scriptFile
Optional member that is present when type is script. The value is a string specifying the
path to the script file on disk, represented with forward slashes. If the file is inside
the top-level source directory then the path is specified relative to that directory.
Otherwise the path is absolute.

backtrace
Optional member that is present when a CMake language backtrace to the install() or other
command invocation that added this installer is available. The value is an unsigned
integer 0-based index into the backtraceGraph member's nodes array.

backtraceGraph
A "codemodel" version 2 "backtrace graph" whose nodes are referenced from backtrace members
elsewhere in this "directory" object.

"codemodel" version 2 "target" object
A codemodel "target" object is referenced by a "codemodel" version 2 object's targets array. Each
"target" object is a JSON object with members:

name A string specifying the logical name of the target.

id A string uniquely identifying the target. The format is unspecified and should not be interpreted
by clients.

type A string specifying the type of the target. The value is one of EXECUTABLE, STATIC_LIBRARY,
SHARED_LIBRARY, MODULE_LIBRARY, OBJECT_LIBRARY, INTERFACE_LIBRARY, or UTILITY.

backtrace
Optional member that is present when a CMake language backtrace to the command in the source code
that created the target is available. The value is an unsigned integer 0-based index into the
backtraceGraph member's nodes array.

folder Optional member that is present when the FOLDER target property is set. The value is a JSON
object with one member:

name A string specifying the name of the target folder.

paths A JSON object containing members:

source A string specifying the path to the target's source directory, represented with forward
slashes. If the directory is inside the top-level source directory then the path is
specified relative to that directory (with . for the top-level source directory itself).
Otherwise the path is absolute.

build A string specifying the path to the target's build directory, represented with forward
slashes. If the directory is inside the top-level build directory then the path is
specified relative to that directory (with . for the top-level build directory itself).
Otherwise the path is absolute.

nameOnDisk
Optional member that is present for executable and library targets that are linked or archived
into a single primary artifact. The value is a string specifying the file name of that artifact
on disk.

artifacts
Optional member that is present for executable and library targets that produce artifacts on disk
meant for consumption by dependents. The value is a JSON array of entries corresponding to the
artifacts. Each entry is a JSON object containing one member:

path A string specifying the path to the file on disk, represented with forward slashes. If the
file is inside the top-level build directory then the path is specified relative to that
directory. Otherwise the path is absolute.

isGeneratorProvided
Optional member that is present with boolean value true if the target is provided by CMake's build
system generator rather than by a command in the source code.

install
Optional member that is present when the target has an install() rule. The value is a JSON object
with members:

prefix A JSON object specifying the installation prefix. It has one member:

path A string specifying the value of CMAKE_INSTALL_PREFIX.

destinations
A JSON array of entries specifying an install destination path. Each entry is a JSON
object with members:

path A string specifying the install destination path. The path may be absolute or
relative to the install prefix.

backtrace
Optional member that is present when a CMake language backtrace to the install()
command invocation that specified this destination is available. The value is an
unsigned integer 0-based index into the backtraceGraph member's nodes array.

launchers
Optional member that is present on executable targets that have at least one launcher specified by
the project. The value is a JSON array of entries corresponding to the specified launchers. Each
entry is a JSON object with members:

command
A string specifying the path to the launcher on disk, represented with forward slashes. If
the file is inside the top-level source directory then the path is specified relative to
that directory.

arguments
Optional member that is present when the launcher command has arguments preceding the
executable to be launched. The value is a JSON array of strings representing the
arguments.

type A string specifying the type of launcher. The value is one of the following:

emulator
An emulator for the target platform when cross-compiling. See the
CROSSCOMPILING_EMULATOR target property.

test A start program for the execution of tests. See the TEST_LAUNCHER target property.

This field was added in codemodel version 2.7.

link Optional member that is present for executables and shared library targets that link into a
runtime binary. The value is a JSON object with members describing the link step:

language
A string specifying the language (e.g. C, CXX, Fortran) of the toolchain is used to invoke
the linker.

commandFragments
Optional member that is present when fragments of the link command line invocation are
available. The value is a JSON array of entries specifying ordered fragments. Each entry
is a JSON object with members:

fragment
A string specifying a fragment of the link command line invocation. The value is
encoded in the build system's native shell format.

role A string specifying the role of the fragment's content:

• flags: link flags.

• libraries: link library file paths or flags.

• libraryPath: library search path flags.

• frameworkPath: macOS framework search path flags.

lto Optional member that is present with boolean value true when link-time optimization (a.k.a.
interprocedural optimization or link-time code generation) is enabled.

sysroot
Optional member that is present when the CMAKE_SYSROOT_LINK or CMAKE_SYSROOT variable is
defined. The value is a JSON object with one member:

path A string specifying the absolute path to the sysroot, represented with forward
slashes.

archive
Optional member that is present for static library targets. The value is a JSON object with
members describing the archive step:

commandFragments
Optional member that is present when fragments of the archiver command line invocation are
available. The value is a JSON array of entries specifying the fragments. Each entry is a
JSON object with members:

fragment
A string specifying a fragment of the archiver command line invocation. The value
is encoded in the build system's native shell format.

role A string specifying the role of the fragment's content:

• flags: archiver flags.

lto Optional member that is present with boolean value true when link-time optimization (a.k.a.
interprocedural optimization or link-time code generation) is enabled.

dependencies
Optional member that is present when the target depends on other targets. The value is a JSON
array of entries corresponding to the dependencies. Each entry is a JSON object with members:

id A string uniquely identifying the target on which this target depends. This matches the
main id member of the other target.

backtrace
Optional member that is present when a CMake language backtrace to the add_dependencies(),
target_link_libraries(), or other command invocation that created this dependency is
available. The value is an unsigned integer 0-based index into the backtraceGraph member's
nodes array.

fileSets
A JSON array of entries corresponding to the target's file sets. Each entry is a JSON object with
members:

name A string specifying the name of the file set.

type A string specifying the type of the file set. See target_sources() supported file set
types.

visibility
A string specifying the visibility of the file set; one of PUBLIC, PRIVATE, or INTERFACE.

baseDirectories
A JSON array of strings, each specifying a base directory containing sources in the file
set. If the directory is inside the top-level source directory then the path is specified
relative to that directory. Otherwise the path is absolute.

This field was added in codemodel version 2.5.

sources
A JSON array of entries corresponding to the target's source files. Each entry is a JSON object
with members:

path A string specifying the path to the source file on disk, represented with forward slashes.
If the file is inside the top-level source directory then the path is specified relative to
that directory. Otherwise the path is absolute.

compileGroupIndex
Optional member that is present when the source is compiled. The value is an unsigned
integer 0-based index into the compileGroups array.

sourceGroupIndex
Optional member that is present when the source is part of a source group either via the
source_group() command or by default. The value is an unsigned integer 0-based index into
the sourceGroups array.

isGenerated
Optional member that is present with boolean value true if the source is GENERATED.

fileSetIndex
Optional member that is present when the source is part of a file set. The value is an
unsigned integer 0-based index into the fileSets array.

This field was added in codemodel version 2.5.

backtrace
Optional member that is present when a CMake language backtrace to the target_sources(),
add_executable(), add_library(), add_custom_target(), or other command invocation that
added this source to the target is available. The value is an unsigned integer 0-based
index into the backtraceGraph member's nodes array.

sourceGroups
Optional member that is present when sources are grouped together by the source_group() command or
by default. The value is a JSON array of entries corresponding to the groups. Each entry is a
JSON object with members:

name A string specifying the name of the source group.

sourceIndexes
A JSON array listing the sources belonging to the group. Each entry is an unsigned integer
0-based index into the main sources array for the target.

compileGroups
Optional member that is present when the target has sources that compile. The value is a JSON
array of entries corresponding to groups of sources that all compile with the same settings. Each
entry is a JSON object with members:

sourceIndexes
A JSON array listing the sources belonging to the group. Each entry is an unsigned integer
0-based index into the main sources array for the target.

language
A string specifying the language (e.g. C, CXX, Fortran) of the toolchain is used to compile
the source file.

languageStandard
Optional member that is present when the language standard is set explicitly (e.g. via
CXX_STANDARD) or implicitly by compile features. Each entry is a JSON object with two
members:

backtraces
Optional member that is present when a CMake language backtrace to the
<LANG>_STANDARD setting is available. If the language standard was set implicitly
by compile features those are used as the backtrace(s). It's possible for multiple
compile features to require the same language standard so there could be multiple
backtraces. The value is a JSON array with each entry being an unsigned integer
0-based index into the backtraceGraph member's nodes array.

standard
String representing the language standard.

This field was added in codemodel version 2.2.

compileCommandFragments
Optional member that is present when fragments of the compiler command line invocation are
available. The value is a JSON array of entries specifying ordered fragments. Each entry
is a JSON object with one member:

fragment
A string specifying a fragment of the compile command line invocation. The value is
encoded in the build system's native shell format.

includes
Optional member that is present when there are include directories. The value is a JSON
array with an entry for each directory. Each entry is a JSON object with members:

path A string specifying the path to the include directory, represented with forward
slashes.

isSystem
Optional member that is present with boolean value true if the include directory is
marked as a system include directory.

backtrace
Optional member that is present when a CMake language backtrace to the
target_include_directories() or other command invocation that added this include
directory is available. The value is an unsigned integer 0-based index into the
backtraceGraph member's nodes array.

frameworks
Optional member that is present when, on Apple platforms, there are frameworks. The value
is a JSON array with an entry for each directory. Each entry is a JSON object with
members:

path A string specifying the path to the framework directory, represented with forward
slashes.

isSystem
Optional member that is present with boolean value true if the framework is marked
as a system one.

backtrace
Optional member that is present when a CMake language backtrace to the
target_link_libraries() or other command invocation that added this framework is
available. The value is an unsigned integer 0-based index into the backtraceGraph
member's nodes array.

This field was added in codemodel version 2.6.

precompileHeaders
Optional member that is present when target_precompile_headers() or other command
invocations set PRECOMPILE_HEADERS on the target. The value is a JSON array with an entry
for each header. Each entry is a JSON object with members:

header Full path to the precompile header file.

backtrace
Optional member that is present when a CMake language backtrace to the
target_precompile_headers() or other command invocation that added this precompiled
header is available. The value is an unsigned integer 0-based index into the
backtraceGraph member's nodes array.

This field was added in codemodel version 2.1.

defines
Optional member that is present when there are preprocessor definitions. The value is a
JSON array with an entry for each definition. Each entry is a JSON object with members:

define A string specifying the preprocessor definition in the format <name>[=<value>], e.g.
DEF or DEF=1.

backtrace
Optional member that is present when a CMake language backtrace to the
target_compile_definitions() or other command invocation that added this
preprocessor definition is available. The value is an unsigned integer 0-based
index into the backtraceGraph member's nodes array.

sysroot
Optional member that is present when the CMAKE_SYSROOT_COMPILE or CMAKE_SYSROOT variable is
defined. The value is a JSON object with one member:

path A string specifying the absolute path to the sysroot, represented with forward
slashes.

backtraceGraph
A "codemodel" version 2 "backtrace graph" whose nodes are referenced from backtrace members
elsewhere in this "target" object.

"codemodel" version 2 "backtrace graph"
The backtraceGraph member of a "codemodel" version 2 "directory" object, or "codemodel" version 2
"target" object is a JSON object describing a graph of backtraces. Its nodes are referenced from
backtrace members elsewhere in the containing object. The backtrace graph object members are:

nodes A JSON array listing nodes in the backtrace graph. Each entry is a JSON object with members:

file An unsigned integer 0-based index into the backtrace files array.

line An optional member present when the node represents a line within the file. The value is
an unsigned integer 1-based line number.

command
An optional member present when the node represents a command invocation within the file.
The value is an unsigned integer 0-based index into the backtrace commands array.

parent An optional member present when the node is not the bottom of the call stack. The value is
an unsigned integer 0-based index of another entry in the backtrace nodes array.

commands
A JSON array listing command names referenced by backtrace nodes. Each entry is a string
specifying a command name.

files A JSON array listing CMake language files referenced by backtrace nodes. Each entry is a string
specifying the path to a file, represented with forward slashes. If the file is inside the
top-level source directory then the path is specified relative to that directory. Otherwise the
path is absolute.

Object Kind "configureLog"
The configureLog object kind describes the location and contents of a cmake-configure-log(7) file.

There is only one configureLog object major version, version 1.

"configureLog" version 1
configureLog object version 1 is a JSON object:

{
"kind": "configureLog",
"version": { "major": 1, "minor": 0 },
"path": "/path/to/top-level-build-dir/CMakeFiles/CMakeConfigureLog.yaml",
"eventKindNames": [ "try_compile-v1", "try_run-v1" ]
}

The members specific to configureLog objects are:

path A string specifying the path to the configure log file. Clients must read the log file from this
path, which may be different than the path documented by cmake-configure-log(7). The log file may
not exist if no events are logged.

eventKindNames
A JSON array whose entries are each a JSON string naming one of the cmake-configure-log(7)
versioned event kinds. At most one version of each configure log event kind will be listed.
Although the configure log may contain other (versioned) event kinds, clients must ignore those
that are not listed in this field.

Object Kind "cache"
The cache object kind lists cache entries. These are the Variables stored in the persistent cache
(CMakeCache.txt) for the build tree.

There is only one cache object major version, version 2. Version 1 does not exist to avoid confusion
with that from cmake-server(7) mode.

"cache" version 2
cache object version 2 is a JSON object:

{
"kind": "cache",
"version": { "major": 2, "minor": 0 },
"entries": [
{
"name": "BUILD_SHARED_LIBS",
"value": "ON",
"type": "BOOL",
"properties": [
{
"name": "HELPSTRING",
"value": "Build shared libraries"
}
]
},
{
"name": "CMAKE_GENERATOR",
"value": "Unix Makefiles",
"type": "INTERNAL",
"properties": [
{
"name": "HELPSTRING",
"value": "Name of generator."
}
]
}
]
}

The members specific to cache objects are:

entries
A JSON array whose entries are each a JSON object specifying a cache entry. The members of each
entry are:

name A string specifying the name of the entry.

value A string specifying the value of the entry.

type A string specifying the type of the entry used by cmake-gui(1) to choose a widget for
editing.

properties
A JSON array of entries specifying associated cache entry properties. Each entry is a JSON
object containing members:

name A string specifying the name of the cache entry property.

value A string specifying the value of the cache entry property.

Object Kind "cmakeFiles"
The cmakeFiles object kind lists files used by CMake while configuring and generating the build system.
These include the CMakeLists.txt files as well as included .cmake files.

There is only one cmakeFiles object major version, version 1.

"cmakeFiles" version 1
cmakeFiles object version 1 is a JSON object:

{
"kind": "cmakeFiles",
"version": { "major": 1, "minor": 1 },
"paths": {
"build": "/path/to/top-level-build-dir",
"source": "/path/to/top-level-source-dir"
},
"inputs": [
{
"path": "CMakeLists.txt"
},
{
"isGenerated": true,
"path": "/path/to/top-level-build-dir/.../CMakeSystem.cmake"
},
{
"isExternal": true,
"path": "/path/to/external/third-party/module.cmake"
},
{
"isCMake": true,
"isExternal": true,
"path": "/path/to/cmake/Modules/CMakeGenericSystem.cmake"
}
],
"globsDependent": [
{
"expression": "src/*.cxx",
"recurse": true,
"files": [
"src/foo.cxx",
"src/bar.cxx"
]
}
]
}

The members specific to cmakeFiles objects are:

paths A JSON object containing members:

source A string specifying the absolute path to the top-level source directory, represented with
forward slashes.

build A string specifying the absolute path to the top-level build directory, represented with
forward slashes.

inputs A JSON array whose entries are each a JSON object specifying an input file used by CMake when
configuring and generating the build system. The members of each entry are:

path A string specifying the path to an input file to CMake, represented with forward slashes.
If the file is inside the top-level source directory then the path is specified relative to
that directory. Otherwise the path is absolute.

isGenerated
Optional member that is present with boolean value true if the path specifies a file that
is under the top-level build directory and the build is out-of-source. This member is not
available on in-source builds.

isExternal
Optional member that is present with boolean value true if the path specifies a file that
is not under the top-level source or build directories.

isCMake
Optional member that is present with boolean value true if the path specifies a file in the
CMake installation.

globsDependent
Optional member that is present when the project calls file(GLOB) or file(GLOB_RECURSE) with the
CONFIGURE_DEPENDS option. The value is a JSON array of JSON objects, each specifying a globbing
expression and the list of paths it matched. If the globbing expression no longer matches the
same list of paths, CMake considers the build system to be out of date.

This field was added in cmakeFiles version 1.1.

The members of each entry are:

expression
A string specifying the globbing expression.

recurse
Optional member that is present with boolean value true if the entry corresponds to a
file(GLOB_RECURSE) call. Otherwise the entry corresponds to a file(GLOB) call.

listDirectories
Optional member that is present with boolean value true if file(GLOB) was called without
LIST_DIRECTORIES false or file(GLOB_RECURSE) was called with LIST_DIRECTORIES true.

followSymlinks
Optional member that is present with boolean value true if file(GLOB) was called with the
FOLLOW_SYMLINKS option.

relative
Optional member that is present if file(GLOB) was called with the RELATIVE <path> option.
The value is a string containing the <path> given.

paths A JSON array of strings specifying the paths matched by the call to file(GLOB) or
file(GLOB_RECURSE).

Object Kind "toolchains"
The toolchains object kind lists properties of the toolchains used during the build. These include the
language, compiler path, ID, and version.

There is only one toolchains object major version, version 1.

"toolchains" version 1
toolchains object version 1 is a JSON object:

{
"kind": "toolchains",
"version": { "major": 1, "minor": 0 },
"toolchains": [
{
"language": "C",
"compiler": {
"path": "/usr/bin/cc",
"id": "GNU",
"version": "9.3.0",
"implicit": {
"includeDirectories": [
"/usr/lib/gcc/x86_64-linux-gnu/9/include",
"/usr/local/include",
"/usr/include/x86_64-linux-gnu",
"/usr/include"
],
"linkDirectories": [
"/usr/lib/gcc/x86_64-linux-gnu/9",
"/usr/lib/x86_64-linux-gnu",
"/usr/lib",
"/lib/x86_64-linux-gnu",
"/lib"
],
"linkFrameworkDirectories": [],
"linkLibraries": [ "gcc", "gcc_s", "c", "gcc", "gcc_s" ]
}
},
"sourceFileExtensions": [ "c", "m" ]
},
{
"language": "CXX",
"compiler": {
"path": "/usr/bin/c++",
"id": "GNU",
"version": "9.3.0",
"implicit": {
"includeDirectories": [
"/usr/include/c++/9",
"/usr/include/x86_64-linux-gnu/c++/9",
"/usr/include/c++/9/backward",
"/usr/lib/gcc/x86_64-linux-gnu/9/include",
"/usr/local/include",
"/usr/include/x86_64-linux-gnu",
"/usr/include"
],
"linkDirectories": [
"/usr/lib/gcc/x86_64-linux-gnu/9",
"/usr/lib/x86_64-linux-gnu",
"/usr/lib",
"/lib/x86_64-linux-gnu",
"/lib"
],
"linkFrameworkDirectories": [],
"linkLibraries": [
"stdc++", "m", "gcc_s", "gcc", "c", "gcc_s", "gcc"
]
}
},
"sourceFileExtensions": [
"C", "M", "c++", "cc", "cpp", "cxx", "mm", "CPP"
]
}
]
}

The members specific to toolchains objects are:

toolchains
A JSON array whose entries are each a JSON object specifying a toolchain associated with a
particular language. The members of each entry are:

language
A JSON string specifying the toolchain language, like C or CXX. Language names are the same
as language names that can be passed to the project() command. Because CMake only supports
a single toolchain per language, this field can be used as a key.

compiler
A JSON object containing members:

path Optional member that is present when the CMAKE_<LANG>_COMPILER variable is defined
for the current language. Its value is a JSON string holding the path to the
compiler.

id Optional member that is present when the CMAKE_<LANG>_COMPILER_ID variable is
defined for the current language. Its value is a JSON string holding the ID (GNU,
MSVC, etc.) of the compiler.

version
Optional member that is present when the CMAKE_<LANG>_COMPILER_VERSION variable is
defined for the current language. Its value is a JSON string holding the version of
the compiler.

target Optional member that is present when the CMAKE_<LANG>_COMPILER_TARGET variable is
defined for the current language. Its value is a JSON string holding the
cross-compiling target of the compiler.

implicit
A JSON object containing members:

includeDirectories
Optional member that is present when the
CMAKE_<LANG>_IMPLICIT_INCLUDE_DIRECTORIES variable is defined for the current
language. Its value is a JSON array of JSON strings where each string holds a
path to an implicit include directory for the compiler.

linkDirectories
Optional member that is present when the
CMAKE_<LANG>_IMPLICIT_LINK_DIRECTORIES variable is defined for the current
language. Its value is a JSON array of JSON strings where each string holds a
path to an implicit link directory for the compiler.

linkFrameworkDirectories
Optional member that is present when the
CMAKE_<LANG>_IMPLICIT_LINK_FRAMEWORK_DIRECTORIES variable is defined for the
current language. Its value is a JSON array of JSON strings where each string
holds a path to an implicit link framework directory for the compiler.

linkLibraries
Optional member that is present when the CMAKE_<LANG>_IMPLICIT_LINK_LIBRARIES
variable is defined for the current language. Its value is a JSON array of
JSON strings where each string holds a path to an implicit link library for
the compiler.

sourceFileExtensions
Optional member that is present when the CMAKE_<LANG>_SOURCE_FILE_EXTENSIONS variable is
defined for the current language. Its value is a JSON array of JSON strings where each each
string holds a file extension (without the leading dot) for the language.

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