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-.. cmake-manual-description: CMake Server
-
-cmake-server(7)
-***************
-
-.. only:: html
-
- .. contents::
-
-Introduction
-============
-
-:manual:`cmake(1)` is capable of providing semantic information about
-CMake code it executes to generate a buildsystem. If executed with
-the ``-E server`` command line options, it starts in a long running mode
-and allows a client to request the available information via a JSON protocol.
-
-The protocol is designed to be useful to IDEs, refactoring tools, and
-other tools which have a need to understand the buildsystem in entirety.
-
-A single :manual:`cmake-buildsystem(7)` may describe buildsystem contents
-and build properties which differ based on
-:manual:`generation-time context <cmake-generator-expressions(7)>`
-including:
-
-* The Platform (eg, Windows, APPLE, Linux).
-* The build configuration (eg, Debug, Release, Coverage).
-* The Compiler (eg, MSVC, GCC, Clang) and compiler version.
-* The language of the source files compiled.
-* Available compile features (eg CXX variadic templates).
-* CMake policies.
-
-The protocol aims to provide information to tooling to satisfy several
-needs:
-
-#. Provide a complete and easily parsed source of all information relevant
- to the tooling as it relates to the source code. There should be no need
- for tooling to parse generated buildsystems to access include directories
- or compile definitions for example.
-#. Semantic information about the CMake buildsystem itself.
-#. Provide a stable interface for reading the information in the CMake cache.
-#. Information for determining when cmake needs to be re-run as a result of
- file changes.
-
-
-Operation
-=========
-
-Start :manual:`cmake(1)` in the server command mode, supplying the path to
-the build directory to process::
-
- cmake -E server (--debug|--pipe <NAMED_PIPE>)
-
-The server will communicate using stdin/stdout (with the ``--debug`` parameter)
-or using a named pipe (with the ``--pipe <NAMED_PIPE>`` parameter).
-
-When connecting to the server (via named pipe or by starting it in ``--debug``
-mode), the server will reply with a hello message::
-
- [== "CMake Server" ==[
- {"supportedProtocolVersions":[{"major":1,"minor":0}],"type":"hello"}
- ]== "CMake Server" ==]
-
-Messages sent to and from the process are wrapped in magic strings::
-
- [== "CMake Server" ==[
- {
- ... some JSON message ...
- }
- ]== "CMake Server" ==]
-
-The server is now ready to accept further requests via the named pipe
-or stdin.
-
-
-Debugging
-=========
-
-CMake server mode can be asked to provide statistics on execution times, etc.
-or to dump a copy of the response into a file. This is done passing a "debug"
-JSON object as a child of the request.
-
-The debug object supports the "showStats" key, which takes a boolean and makes
-the server mode return a "zzzDebug" object with stats as part of its response.
-"dumpToFile" takes a string value and will cause the cmake server to copy
-the response into the given filename.
-
-This is a response from the cmake server with "showStats" set to true::
-
- [== "CMake Server" ==[
- {
- "cookie":"",
- "errorMessage":"Waiting for type \"handshake\".",
- "inReplyTo":"unknown",
- "type":"error",
- "zzzDebug": {
- "dumpFile":"/tmp/error.txt",
- "jsonSerialization":0.011016,
- "size":111,
- "totalTime":0.025995
- }
- }
- ]== "CMake Server" ==]
-
-The server has made a copy of this response into the file /tmp/error.txt and
-took 0.011 seconds to turn the JSON response into a string, and it took 0.025
-seconds to process the request in total. The reply has a size of 111 bytes.
-
-
-Protocol API
-============
-
-
-General Message Layout
-----------------------
-
-All messages need to have a "type" value, which identifies the type of
-message that is passed back or forth. E.g. the initial message sent by the
-server is of type "hello". Messages without a type will generate an response
-of type "error".
-
-All requests sent to the server may contain a "cookie" value. This value
-will he handed back unchanged in all responses triggered by the request.
-
-All responses will contain a value "inReplyTo", which may be empty in
-case of parse errors, but will contain the type of the request message
-in all other cases.
-
-
-Type "reply"
-^^^^^^^^^^^^
-
-This type is used by the server to reply to requests.
-
-The message may -- depending on the type of the original request --
-contain values.
-
-Example::
-
- [== "CMake Server" ==[
- {"cookie":"zimtstern","inReplyTo":"handshake","type":"reply"}
- ]== "CMake Server" ==]
-
-
-Type "error"
-^^^^^^^^^^^^
-
-This type is used to return an error condition to the client. It will
-contain an "errorMessage".
-
-Example::
-
- [== "CMake Server" ==[
- {"cookie":"","errorMessage":"Protocol version not supported.","inReplyTo":"handshake","type":"error"}
- ]== "CMake Server" ==]
-
-
-Type "progress"
-^^^^^^^^^^^^^^^
-
-When the server is busy for a long time, it is polite to send back replies of
-type "progress" to the client. These will contain a "progressMessage" with a
-string describing the action currently taking place as well as
-"progressMinimum", "progressMaximum" and "progressCurrent" with integer values
-describing the range of progess.
-
-Messages of type "progress" will be followed by more "progress" messages or with
-a message of type "reply" or "error" that complete the request.
-
-"progress" messages may not be emitted after the "reply" or "error" message for
-the request that triggered the responses was delivered.
-
-
-Type "message"
-^^^^^^^^^^^^^^
-
-A message is triggered when the server processes a request and produces some
-form of output that should be displayed to the user. A Message has a "message"
-with the actual text to display as well as a "title" with a suggested dialog
-box title.
-
-Example::
-
- [== "CMake Server" ==[
- {"cookie":"","message":"Something happened.","title":"Title Text","inReplyTo":"handshake","type":"message"}
- ]== "CMake Server" ==]
-
-
-Type "signal"
-^^^^^^^^^^^^^
-
-The server can send signals when it detects changes in the system state. Signals
-are of type "signal", have an empty "cookie" and "inReplyTo" field and always
-have a "name" set to show which signal was sent.
-
-
-Specific Signals
-----------------
-
-The cmake server may sent signals with the following names:
-
-"dirty" Signal
-^^^^^^^^^^^^^^
-
-The "dirty" signal is sent whenever the server determines that the configuration
-of the project is no longer up-to-date. This happens when any of the files that have
-an influence on the build system is changed.
-
-The "dirty" signal may look like this::
-
- [== "CMake Server" ==[
- {
- "cookie":"",
- "inReplyTo":"",
- "name":"dirty",
- "type":"signal"}
- ]== "CMake Server" ==]
-
-
-"fileChange" Signal
-^^^^^^^^^^^^^^^^^^^
-
-The "fileChange" signal is sent whenever a watched file is changed. It contains
-the "path" that has changed and a list of "properties" with the kind of change
-that was detected. Possible changes are "change" and "rename".
-
-The "fileChange" signal looks like this::
-
- [== "CMake Server" ==[
- {
- "cookie":"",
- "inReplyTo":"",
- "name":"fileChange",
- "path":"/absolute/CMakeLists.txt",
- "properties":["change"],
- "type":"signal"}
- ]== "CMake Server" ==]
-
-
-Specific Message Types
-----------------------
-
-
-Type "hello"
-^^^^^^^^^^^^
-
-The initial message send by the cmake server on startup is of type "hello".
-This is the only message ever sent by the server that is not of type "reply",
-"progress" or "error".
-
-It will contain "supportedProtocolVersions" with an array of server protocol
-versions supported by the cmake server. These are JSON objects with "major" and
-"minor" keys containing non-negative integer values. Some versions may be marked
-as experimental. These will contain the "isExperimental" key set to true. Enabling
-these requires a special command line argument when starting the cmake server mode.
-
-Within a "major" version all "minor" versions are fully backwards compatible.
-New "minor" versions may introduce functionality in such a way that existing
-clients of the same "major" version will continue to work, provided they
-ignore keys in the output that they do not know about.
-
-Example::
-
- [== "CMake Server" ==[
- {"supportedProtocolVersions":[{"major":0,"minor":1}],"type":"hello"}
- ]== "CMake Server" ==]
-
-
-Type "handshake"
-^^^^^^^^^^^^^^^^
-
-The first request that the client may send to the server is of type "handshake".
-
-This request needs to pass one of the "supportedProtocolVersions" of the "hello"
-type response received earlier back to the server in the "protocolVersion" field.
-Giving the "major" version of the requested protocol version will make the server
-use the latest minor version of that protocol. Use this if you do not explicitly
-need to depend on a specific minor version.
-
-If the build directory already contains a CMake cache, it is sufficient to set
-the "buildDirectory" attribute. To create a fresh build directory, additional
-attributes are required depending on the protocol version.
-
-Protocol version 1.0 requires the following attributes to be set:
-
- * "sourceDirectory" with a path to the sources
- * "buildDirectory" with a path to the build directory
- * "generator" with the generator name
- * "extraGenerator" (optional!) with the extra generator to be used
- * "platform" with the generator platform (if supported by the generator)
- * "toolset" with the generator toolset (if supported by the generator)
-
-Example::
-
- [== "CMake Server" ==[
- {"cookie":"zimtstern","type":"handshake","protocolVersion":{"major":0},
- "sourceDirectory":"/home/code/cmake", "buildDirectory":"/tmp/testbuild",
- "generator":"Ninja"}
- ]== "CMake Server" ==]
-
-which will result in a response type "reply"::
-
- [== "CMake Server" ==[
- {"cookie":"zimtstern","inReplyTo":"handshake","type":"reply"}
- ]== "CMake Server" ==]
-
-indicating that the server is ready for action.
-
-
-Type "globalSettings"
-^^^^^^^^^^^^^^^^^^^^^
-
-This request can be sent after the initial handshake. It will return a
-JSON structure with information on cmake state.
-
-Example::
-
- [== "CMake Server" ==[
- {"type":"globalSettings"}
- ]== "CMake Server" ==]
-
-which will result in a response type "reply"::
-
- [== "CMake Server" ==[
- {
- "buildDirectory": "/tmp/test-build",
- "capabilities": {
- "generators": [
- {
- "extraGenerators": [],
- "name": "Watcom WMake",
- "platformSupport": false,
- "toolsetSupport": false
- },
- <...>
- ],
- "serverMode": false,
- "version": {
- "isDirty": false,
- "major": 3,
- "minor": 6,
- "patch": 20160830,
- "string": "3.6.20160830-gd6abad",
- "suffix": "gd6abad"
- }
- },
- "checkSystemVars": false,
- "cookie": "",
- "extraGenerator": "",
- "generator": "Ninja",
- "debugOutput": false,
- "inReplyTo": "globalSettings",
- "sourceDirectory": "/home/code/cmake",
- "trace": false,
- "traceExpand": false,
- "type": "reply",
- "warnUninitialized": false,
- "warnUnused": false,
- "warnUnusedCli": true
- }
- ]== "CMake Server" ==]
-
-
-Type "setGlobalSettings"
-^^^^^^^^^^^^^^^^^^^^^^^^
-
-This request can be sent to change the global settings attributes. Unknown
-attributes are going to be ignored. Read-only attributes reported by
-"globalSettings" are all capabilities, buildDirectory, generator,
-extraGenerator and sourceDirectory. Any attempt to set these will be ignored,
-too.
-
-All other settings will be changed.
-
-The server will respond with an empty reply message or an error.
-
-Example::
-
- [== "CMake Server" ==[
- {"type":"setGlobalSettings","debugOutput":true}
- ]== "CMake Server" ==]
-
-CMake will reply to this with::
-
- [== "CMake Server" ==[
- {"inReplyTo":"setGlobalSettings","type":"reply"}
- ]== "CMake Server" ==]
-
-
-Type "configure"
-^^^^^^^^^^^^^^^^
-
-This request will configure a project for build.
-
-To configure a build directory already containing cmake files, it is enough to
-set "buildDirectory" via "setGlobalSettings". To create a fresh build directory
-you also need to set "currentGenerator" and "sourceDirectory" via "setGlobalSettings"
-in addition to "buildDirectory".
-
-You may a list of strings to "configure" via the "cacheArguments" key. These
-strings will be interpreted similar to command line arguments related to
-cache handling that are passed to the cmake command line client.
-
-Example::
-
- [== "CMake Server" ==[
- {"type":"configure", "cacheArguments":["-Dsomething=else"]}
- ]== "CMake Server" ==]
-
-CMake will reply like this (after reporting progress for some time)::
-
- [== "CMake Server" ==[
- {"cookie":"","inReplyTo":"configure","type":"reply"}
- ]== "CMake Server" ==]
-
-
-Type "compute"
-^^^^^^^^^^^^^^
-
-This request will generate build system files in the build directory and
-is only available after a project was successfully "configure"d.
-
-Example::
-
- [== "CMake Server" ==[
- {"type":"compute"}
- ]== "CMake Server" ==]
-
-CMake will reply (after reporting progress information)::
-
- [== "CMake Server" ==[
- {"cookie":"","inReplyTo":"compute","type":"reply"}
- ]== "CMake Server" ==]
-
-
-Type "codemodel"
-^^^^^^^^^^^^^^^^
-
-The "codemodel" request can be used after a project was "compute"d successfully.
-
-It will list the complete project structure as it is known to cmake.
-
-The reply will contain a key "configurations", which will contain a list of
-configuration objects. Configuration objects are used to destinquish between
-different configurations the build directory might have enabled. While most
-generators only support one configuration, others might support several.
-
-Each configuration object can have the following keys:
-
-"name"
- contains the name of the configuration. The name may be empty.
-"projects"
- contains a list of project objects, one for each build project.
-
-Project objects define one (sub-)project defined in the cmake build system.
-
-Each project object can have the following keys:
-
-"name"
- contains the (sub-)projects name.
-"sourceDirectory"
- contains the current source directory
-"buildDirectory"
- contains the current build directory.
-"targets"
- contains a list of build system target objects.
-
-Target objects define individual build targets for a certain configuration.
-
-Each target object can have the following keys:
-
-"name"
- contains the name of the target.
-"type"
- defines the type of build of the target. Possible values are
- "STATIC_LIBRARY", "MODULE_LIBRARY", "SHARED_LIBRARY", "OBJECT_LIBRARY",
- "EXECUTABLE", "UTILITY" and "INTERFACE_LIBRARY".
-"fullName"
- contains the full name of the build result (incl. extensions, etc.).
-"sourceDirectory"
- contains the current source directory.
-"buildDirectory"
- contains the current build directory.
-"artifacts"
- with a list of build artifacts. The list is sorted with the most
- important artifacts first (e.g. a .DLL file is listed before a
- .PDB file on windows).
-"linkerLanguage"
- contains the language of the linker used to produce the artifact.
-"linkLibraries"
- with a list of libraries to link to. This value is encoded in the
- system's native shell format.
-"linkFlags"
- with a list of flags to pass to the linker. This value is encoded in
- the system's native shell format.
-"linkLanguageFlags"
- with the flags for a compiler using the linkerLanguage. This value is
- encoded in the system's native shell format.
-"frameworkPath"
- with the framework path (on Apple computers). This value is encoded
- in the system's native shell format.
-"linkPath"
- with the link path. This value is encoded in the system's native shell
- format.
-"sysroot"
- with the sysroot path.
-"fileGroups"
- contains the source files making up the target.
-
-FileGroups are used to group sources using similar settings together.
-
-Each fileGroup object may contain the following keys:
-
-"language"
- contains the programming language used by all files in the group.
-"compileFlags"
- with a string containing all the flags passed to the compiler
- when building any of the files in this group. This value is encoded in
- the system's native shell format.
-"includePath"
- with a list of include paths. Each include path is an object
- containing a "path" with the actual include path and "isSystem" with a bool
- value informing whether this is a normal include or a system include. This
- value is encoded in the system's native shell format.
-"defines"
- with a list of defines in the form "SOMEVALUE" or "SOMEVALUE=42". This
- value is encoded in the system's native shell format.
-"sources"
- with a list of source files.
-
-All file paths in the fileGroup are either absolute or relative to the
-sourceDirectory of the target.
-
-Example::
-
- [== "CMake Server" ==[
- {"type":"codemodel"}
- ]== "CMake Server" ==]
-
-CMake will reply::
-
- [== "CMake Server" ==[
- {
- "configurations": [
- {
- "name": "",
- "projects": [
- {
- "buildDirectory": "/tmp/build/Source/CursesDialog/form",
- "name": "CMAKE_FORM",
- "sourceDirectory": "/home/code/src/cmake/Source/CursesDialog/form",
- "targets": [
- {
- "artifacts": [ "/tmp/build/Source/CursesDialog/form/libcmForm.a" ],
- "buildDirectory": "/tmp/build/Source/CursesDialog/form",
- "fileGroups": [
- {
- "compileFlags": " -std=gnu11",
- "defines": [ "CURL_STATICLIB", "LIBARCHIVE_STATIC" ],
- "includePath": [ { "path": "/tmp/build/Utilities" }, <...> ],
- "isGenerated": false,
- "language": "C",
- "sources": [ "fld_arg.c", <...> ]
- }
- ],
- "fullName": "libcmForm.a",
- "linkerLanguage": "C",
- "name": "cmForm",
- "sourceDirectory": "/home/code/src/cmake/Source/CursesDialog/form",
- "type": "STATIC_LIBRARY"
- }
- ]
- },
- <...>
- ]
- }
- ],
- "cookie": "",
- "inReplyTo": "codemodel",
- "type": "reply"
- }
- ]== "CMake Server" ==]
-
-
-Type "cmakeInputs"
-^^^^^^^^^^^^^^^^^^
-
-The "cmakeInputs" requests will report files used by CMake as part
-of the build system itself.
-
-This request is only available after a project was successfully
-"configure"d.
-
-Example::
-
- [== "CMake Server" ==[
- {"type":"cmakeInputs"}
- ]== "CMake Server" ==]
-
-CMake will reply with the following information::
-
- [== "CMake Server" ==[
- {"buildFiles":
- [
- {"isCMake":true,"isTemporary":false,"sources":["/usr/lib/cmake/...", ... ]},
- {"isCMake":false,"isTemporary":false,"sources":["CMakeLists.txt", ...]},
- {"isCMake":false,"isTemporary":true,"sources":["/tmp/build/CMakeFiles/...", ...]}
- ],
- "cmakeRootDirectory":"/usr/lib/cmake",
- "sourceDirectory":"/home/code/src/cmake",
- "cookie":"",
- "inReplyTo":"cmakeInputs",
- "type":"reply"
- }
- ]== "CMake Server" ==]
-
-All file names are either relative to the top level source directory or
-absolute.
-
-The list of files which "isCMake" set to true are part of the cmake installation.
-
-The list of files witch "isTemporary" set to true are part of the build directory
-and will not survive the build directory getting cleaned out.
-
-
-Type "cache"
-^^^^^^^^^^^^
-
-The "cache" request will list the cached configuration values.
-
-Example::
-
- [== "CMake Server" ==[
- {"type":"cache"}
- ]== "CMake Server" ==]
-
-CMake will respond with the following output::
-
- [== "CMake Server" ==[
- {
- "cookie":"","inReplyTo":"cache","type":"reply",
- "cache":
- [
- {
- "key":"SOMEVALUE",
- "properties":
- {
- "ADVANCED":"1",
- "HELPSTRING":"This is not helpful"
- }
- "type":"STRING",
- "value":"TEST"}
- ]
- }
- ]== "CMake Server" ==]
-
-The output can be limited to a list of keys by passing an array of key names
-to the "keys" optional field of the "cache" request.
-
-
-Type "fileSystemWatchers"
-^^^^^^^^^^^^^^^^^^^^^^^^^
-
-The server can watch the filesystem for changes. The "fileSystemWatchers"
-command will report on the files and directories watched.
-
-Example::
-
- [== "CMake Server" ==[
- {"type":"fileSystemWatchers"}
- ]== "CMake Server" ==]
-
-CMake will respond with the following output::
-
- [== "CMake Server" ==[
- {
- "cookie":"","inReplyTo":"fileSystemWatchers","type":"reply",
- "watchedFiles": [ "/absolute/path" ],
- "watchedDirectories": [ "/absolute" ]
- }
- ]== "CMake Server" ==]