Cmake set. CMake Tutorial. These values allow vendors like Visual Studio to supply the required environment before CMake is invoked. Exercise 3 - Adding a Version Number and Configured Header File. Visual Studio provides one x64-Debug configuration by default. This command has been superseded by alternatives: Jun 5, 2023 · 1. The most generic way to access properties is through the set_property and get_property commands. Set a normal, cache, or environment variable to a given value. MultiCPackConfig. You set these command line options in your CMakeList (using variables like CMAKE_CXX_FLAGS, commands like add_definitions() and properties like COMPILE_FLAGS) and CMake automatically translates them to the settings in . set(<variable> <value> [[CACHE <type> <docstring> [FORCE]] | PARENT_SCOPE]) Within CMake sets <variable> to the value <value>. The syntax for the command is to list allthe targets you want to change, and then provide the values you want toset next. The flags will then be placed at the toolchain-defined flag position in the link command. To make use of the new library we will add an add_subdirectory() call in the top-level CMakeLists. This allows for the elements to have special characters like ; in them. Properties on Cache Entries. │ ├── car. include_directories(${MyProject_SOURCE_DIR If enabling ASM, list it last so that CMake can check whether compilers for other languages like C work for assembly too. Adds definitions to the compiler command line for targets in the current directory, whether added before or after this command is invoked, and for the ones in sub-directories added after. txt and a few initial source files. The CMAKE_MSVC_RUNTIME_LIBRARY variable and MSVC_RUNTIME_LIBRARY target property may be set to select the MSVC runtime library. In this mode, CMake searches for a file called Find<PackageName>. " Join all the <input> arguments together using the <glue> string and store the result in the named <output_variable>. An optional string representing the value. 1) # Specifies a library name, specifies whether the library is STATIC or # SHARED, and provides relative paths to the source code. Jan 10, 2014 · Not sure which ones you have to set, probably the environment ones. get_cmake_property. This variable can be set by the user during the first time a build tree is configured. 6, together with a general overhaul of the property system to what it is today. See Properties on Targetsfor the list of properties known to CMake. vc[x]proj), but in a user-and-machine-specific . Alternatively, you can also. Only set environment variables that are absolutely necessary for the project’s build process. Jun 12, 2015 · cmake --build . add_subdirectory(source_dir [binary_dir] [EXCLUDE_FROM_ALL] [SYSTEM]) Adds a subdirectory to the build. OFF: Corresponding flag is not selected. COMPILE_FLAGS. The Ninja generator sets this to ninja. Defines one property in a scope for use with the set_property() and get_property() commands. TODO 2: Click to show/hide answer. The targets do not need to be in the current CMakeLists. set 命令可以设置普通变量、缓存条目、环境变量三种变量的值，分别对应上述三种命令格式。. Exercise 2 - Specifying the C++ Standard. Normally, set will set a regular CMake variable. txt contains multiple project() calls, the most recently called one from that top CMake 3. Properties on Tests. txt. See Properties on Directories for the list of properties known to CMake and their individual documentation for the behavior of each property. You can use FORCE to set a cached variable even if it CMAKE_PROJECT_NAME. Now you see the Settings Editor with the installed configurations on the left. Gets one property from one object in a scope. c) 🆕 The better way The newer way to set the C++ standard for a specific target (like add_executable() ) is to use target_compile_features() to only switch on/off C++XY version features per-target instead of globally. See the cmake-language (7) variables documentation for the scopes and interaction of normal variables and cache entries. Get a global property of the CMake instance. Use the `cmake -E env` command to print the value of an environment variable. For example, the GNU compiler supports variadic templates (with a warning) even if -std=gnu++98 is used. cmake_minimum_required(VERSION 3. Use the LINK_OPTIONS target property or target_link_options() command to add link flags explicitly. For those compilers, you say -std=c++1z or -std=c++2a, and those stay around forever, eventually becoming aliases for -std=c++17 and -std=c++20, resp. In cross-compiling scenarios, a toolchain file may be specified with information about compiler and utility paths. The target is the name of a CMake target (executable, library, or custom) to which you want to add the custom command. See the cmake-properties manual for a list of supported get_property. The source_dir specifies the directory in which the source CMakeLists. It is commonly used by makefile users in order to install software at non-default location. If a non-full path value is supplied then CMake will resolve the full path of the compiler. Jun 24, 2015 · Learn how to use set, string, list, and cache commands to define and manipulate variables in CMake scripts. 1 was released in 2014 and introduced the CMAKE_CXX_STANDARD variable that you can use. <value> is expanded before <variable> is set to it. txt file. Use the FORCE option to overwrite existing entries. 1. This manual describes options which may be set using any of the user interface tools, though the mode of setting an option is different for each tool. You can also undefine a variable: $ cmake -UVARIABLE path/to/source Variables are stored in the `CMake` cache. txt contains multiple project() calls, the most recently called one from that top level CMakeLists. cmake , looking first in the locations listed in the CMAKE_MODULE_PATH , then among the Find Modules provided by the CMake installation. txt Or run CMake with following parameters: cmake -DCMAKE_EXPORT_COMPILE_COMMANDS=1 . (if someone could confirm) 2. This will be written to CMakeLists. These are specified using the CMake variables CMAKE_MAKE_PROGRAM and CMAKE_GENERATOR. CMake is a cross-platform, open-source build system that generates platform-specific makefiles, project files, and IDE code for building, testing, and packaging software. 420 in cmake 3. See examples, syntax, and tips for working with variables and the cache. txt and code files are located. txt file, make sure that the variable is set before any calls to project(). ”. Sep 3, 2018 · If you're using CMAKE to generate a Visual Studio solution, and you want Visual Studio to output compiled files into /bin, Peter's answer needs to be modified a bit: string( TOUPPER ${OUTPUTCONFIG} OUTPUTCONFIG ) set( CMAKE_ARCHIVE_OUTPUT_DIRECTORY_${OUTPUTCONFIG} ${CMAKE_SOURCE_DIR}/lib ) If no such normal variable exists, CMake will then search for a cache entry with that name. "then you should not be using set and should leave it to the user to use -D" - Normally, the code calls set for a variable, which is expected to be defined by a user. Valid values are: "set" Set the respective value. Use descriptive names for your environment variables. cmake (l. It is mainly useful for defining the way a property is initialized or inherited. That said, setting environment variable prior to calling cmake is often the easiest solution to solve the problem. Use the first one: set_target_properties(${TARGET} PROPERTIES COMPILE_FLAGS ${BUILD_FLAGS}) The flags stored in BUILD_FLAGS are appended after CMAKE_CXX_FLAGS when compiling the sources of TARGET. ├── build. Kitware offers live CMake training courses throughout the year. 1 or later available, you can just write this in your top-level CMakeLists. Mastering CMake is a textbook published by Kitware that you can purchase from Amazon or read the open source version online. Once the endforeach is evaluated, the recorded list May 21, 2012 · The cmake(1) Build a Project ( cmake --build) gained --parallel [<jobs>] and -j [<jobs>] options to specify a parallel build level. Exercise 1 - Building a Basic Project. Step 1: A Basic Starting Point. 19: One may use cmake-presets(7) to specify toolchain files. The Makefile Generators set this to make, gmake, or a generator-specific tool (e. Specify the C++ Standard. See the cmake-compile-features(7) manual for information on compile features and a list of supported compilers. 9. The ccmake(1) and cmake-gui(1) tools guide the user through setting the various necessary options. foreach(<loop_var> <items>) <commands> endforeach() where <items> is a list of items that are separated by semicolon or whitespace. The value of the <property> is stored in the specified <variable> . cd build. The lists can be preempted with environment variables that can be set before CMake is run. Furthermore, it must be called in the highest directory common to all targets using the named language directly for compiling sources or indirectly through Sep 7, 2020 · set ( ENV {<variable>} [<value>]) #设置环境变量. by a user), and if yes, then the value of the variable is not updated. This property is initialized by the value of the CMAKE_CXX_STANDARD variable if it is set when a target is created. New in version 3. This default behavior can be changed by setting CMAKE_LINK_DIRECTORIES_BEFORE to ON . As mentioned by dkg, you can also set the environment variable CMAKE_BUILD_PARALLEL_LEVEL. This is a file named `CMakeCache. The description of the top level project. To force a variable reference of the form ${VAR} to return an empty string, use set(<variable> ""), which clears the normal variable but leaves it defined. Option: Here is a simple source and build tree to make it clear. See documentation of the directory and target LINK_OPTIONS properties. 13 there is the add_link_options command. Dec 28, 2016 · First off: recommended usage of CMake is to always specify CMAKE_BUILD_TYPE explicitly on the command line (if and only if using a single-configuration generator). Links to CMake's documentation: Config-file Packages ¶. See cmake_path(COMPARE) for more details. Make a new directory called Step5_build. Use set_target_properties() to set target property values. Now let us consider a simple custom command for The value used for each of these variables is the value as set at the end of the directory scope in which the target was created. Multiple arguments will be joined as a semicolon CMake Scripts, when processed with cmake-P, bind variables in one "directory" scope. Each may be either a string or an object with the following fields: value. You can use any prop value pair you want and extract itlater with the get_property()or get_target_property()command. Uses <path-to-build> as the build tree and <path-to-source> as the source tree. set means CMake sets the respective value, and external means CMake won't set the respective value. strategy. --target help is assuming your build directory is at current directory, as indicated by the "dot". Properties are usually used to control how a target is built, but some query the target instead. Variable Expansion ¶ The if command was written very early in CMake's history, predating the ${} variable evaluation syntax, and for convenience evaluates variables named by its arguments as shown in the above signatures. CMake stores a separate set of "cache" variables, or "cache entries", whose values persist across multiple runs within a project build tree. begin with _ followed by the name of any CMake Command. This worked for me with cmake version 3. One way for a user to set a different value for BL would be on the cmake command line. Properties on Directories. txt file and try this: cmake -G %1 -DBUILD_SHARED_LIBS=ON -DBUILD_STATIC_LIBS=ON -DBUILD_TESTS=ON . If it is a relative path, it will be evaluated with respect to the current directory (the typical usage), but it may also be an absolute path. txt file, or put it right before any new target is defined: In the Step12 directory, create a file called MultiCPackConfig. The normal set command only sets the cached variable if it is not already set - this allows you to override cached variables with -D. Set this variable to install only a single CPack component as opposed to all of them. The command has a few modes by which it searches for packages: Module mode. 13: LINK_OPTIONS target property and target_link_options() command. See cmake-A option for possible values for architecture and cmake-T for toolset. TODO 1: Click to show/hide answer. txt will determine the name Nov 1, 2018 · The code set(BL "Ei" CACHE STRING "library") defines a CMake cache variable. Options that are required to make the compiler work correctly can be One way would be. To join a list's elements, prefer to use the JOIN operator from the list() command. Next, use the CPACK_INSTALL_CMAKE_PROJECTS variable to specify which projects to install. An optional string telling CMake how to handle the architecture or toolset field. g. Multiple value arguments are packed into a semicolon-separated list In normal builds, CMake automatically determines the toolchain for host builds based on system introspection and defaults. CACHE). 17. We recommend using set with IDE generators like the Visual Studio Generator. answered Nov 27, 2014 at 11:15. This command can be used to add any link options, but alternative commands exist to add libraries ( target_link_libraries() or link_libraries() ). This command can be used to add any flags, but it is intended to add preprocessor definitions. For Makefile-based generators, CMake will try a list of usual compilers until it finds a working one. Historically, the command also associated documentation with a property, but that is no longer considered a primary use case. Example: cmake --build <build_dir> --config Release. The most simple way for a CMake user to tell cmake(1) to search in a non-standard prefix for a package is to set See the cmake-buildsystem(7) manual for more on defining buildsystem properties. They map to corresponding options of the native build tool. Navigate to Help/guide/importing-exporting/MyExe, create a build directory, run cmake and build and install the project. 13: By default the directories specified are appended onto the current list of directories. Set this variable to change the build type if you are using a multi-config generator. If CACHE is present, then the <variable> is put in the The list subcommands APPEND, INSERT, FILTER, PREPEND, POP_BACK, POP_FRONT, REMOVE_AT, REMOVE_ITEM, REMOVE_DUPLICATES, REVERSE and SORT may create new values for the list within the current CMake variable scope. Persistent Cache. 13. /std:c++latest, otoh, is a moving target. Cross-compiling a piece of software means that the software is built on one system, but is intended to run on a different system. CMake searches in a number of locations for package configuration files, as described in the find_package() documentation. . So you can initially call: cmake -E env CXXFLAGS="-Wall" cmake . This will make it easier to understand what the variable is used for. You can code it yourself in CMake (I did that for our framework at work). The usage is as follows: If the language-specific CMAKE_<LANG>_LINK_LIBRARY_USING_<FEATURE>_SUPPORTED variable is true, the feature must be defined by the corresponding CMAKE_<LANG>_LINK_LIBRARY_USING_<FEATURE> variable. The documentation hints at this, but I've just tried it to make sure. The variable could be set in a user supplied toolchain file or via -D on the command line. In this file, first include the default configuration file that was created by the cmake executable. Build and Test. See the cmake-properties(7) manual for available Set properties on a target. . The Python_FIND_ABI variable is a 3-tuple specifying, in that order, pydebug ( d ), pymalloc ( m) and unicode ( u) flags. 15, older versions of CMake must use make install) from the command line. It can be used with or without CMake, but it may depend on some software being installed on the system. Dec 15, 2021 · To open the CMake settings editor, select the Configuration drop-down in the main toolbar and choose Manage Configurations. 15 and above prefer to leave the MSVC runtime library selection flags out of the default CMAKE_<LANG>_FLAGS_<CONFIG> values and instead offer a first-class abstraction. See examples, documentation, and tips on scope, generator expressions, and debugging variables. See also the set_property(TARGET)command. If you want a cross-platform way to do this that doesn't depend on the syntax of a specific shell to set environment variables, there is the cmake -E env command. The name of the top level project. Because of this, unsetting a normal variable can expose a cache variable that was previously hidden. The cmake(1) tool can be invoked to specify options on the command line. set. CMake will compute the appropriate compile flags to use by considering the features specified for each target. How can I correctly set the global variable source_list in the function test()? Can't cmake do it in a simple and normal way? A property is a key-value pair attached to a specific object. If you set your build directory to another directory other than current directory, let say, /build, then you should specify it as cmake --build build --target help. A Basic Starting Point (Step 1) Adding a Version Number and Configured Header File. TODO 3: Click to show/hide answer. The CMake Tools extension can create the files for a basic CMake project for you. This variable holds the name of the project as specified in the top level CMakeLists. Define and document custom properties. CPack is a powerful, easy to use, cross-platform software packaging tool distributed with CMake. cmake-gui(1) offers a checkbox. This page documents variables that are provided by CMake or have meaning to CMake when set by project code. nmake for NMake Makefiles). txt file so that the library will get built. fenix688. 2 path/to/your/source. Note. Names starting with a capital letter are reserved for built-in file sets predefined by CMake. Properties that affect the name of a target’s output file are as follows. txt` stored at the root of your build directory that is generated by `cmake`. 4. Each of these properties corresponds to a command-line option of the compiler ( cl ). Evaluate a group of commands for each value in a list. cmake-properties (7) Properties of Global Scope. Packaging With CPack. 26. txt only take effect for cmake itself (configure-time), so you cannot use this method to set an environment variable that a custom command might need (build-time). The tutorial examples are progressive so that each step provides the complete solution for the previous step. set_directory_properties(PROPERTIES <prop1> <value1> [<prop2> <value2>] ) Sets properties of the current directory and its subdirectories in key-value pairs. foreach. For example: cmake -G "Your Generator" -D CMAKE_C_COMPILER=gcc-4. Jan 10, 2024 · If you set CMAKE_TOOLCHAIN_FILE in your CMakeList. We want to create an executable that when run creates a basic main. A variable "set" or "unset" not inside a function call binds to the current directory scope. They will be executed in the order specified. The second argument determines the scope from which to get the property. However, without a FORCE option in the set statement, that means that it will not be overwritten if the variable was previously defined in the cache. In its simplest form, the first argument to set is the name of the variable and the rest of the arguments are the values. You have to enter all your command-line definitions before including the path. cmake ¶. For the full list of such commands, run cmake -E help. These commands allow you to set or get a property from any object in CMake that has properties. Multiple arguments will be joined as a ;-list to form the Each target_sources(FILE_SET) entry starts with INTERFACE, PUBLIC, or PRIVATE and accepts the following arguments: FILE_SET <set>. Jan 3, 2024 · # Sets the minimum version of CMake required to build your native library. In the event that the top level CMakeLists. Set the various project-specific variables detailed in the Synopsis and Options sections above. Jun 9, 2020 · Delete the CMakeCache. Your use case deviates from this best practice, so treat this answer as "how you can do it," not necessarily as "how you should do it. Since cache entries are meant to provide user-settable values this does not overwrite existing cache entries by default. This generator stores CMAKE_MAKE_PROGRAM in the CMake cache so that it may be edited by the user. In this case, we want to install both debug and release. All CMake variables are stored internally as strings although they may sometimes be interpreted as other types. cc file in the current directory. vc [x]proj files when generating them. DESTDIR means DESTination DIRectory. The next options to CTest are the --build-generator and --build-makeprogram options. Nov 18, 2020 · @Someprogrammerdude adding rationale to the question, I realized that Clang and GCC just use a different way to enable latest. The INTERFACE, PUBLIC and PRIVATE keywords are required to specify the scope of the Aug 3, 2012 · Since CMake 3. This command must be called in file scope, not in a function call. txt file by a project() command. It must contain only letters, numbers and underscores. The syntax for the command is to list all the files you want to change, and then provide the values you want to set next. Signatures of this command that specify a <value> placeholder expect zero or more arguments. A step-by-step tutorial that walks you through using CMake with a series of self-guided exercises. # This ensures that a certain set of CMake features is available to # your build. user file, and CMake does not generate these. The reason is that the settings from the Debugging tab of Visual Studio Project properties are not stored in the project file (. This step will install set (CMAKE_C_STANDARD 17) set (CMAKE_C_STANDARD_REQUIRED TRUE) add_executable (app1 src/main1. CMake 3. Nov 21, 2017 · The reason for that is that these functions predate the general set_property call, which was only introduced with CMake 2. BUILD_TYPE. Set the given cache <variable> (cache entry). Set the appropriate CMAKE_FOO_COMPILER variable (s) to a valid compiler name or full path on the command-line using cmake -D. It applies to all subsequent add_library and add_executable commands in the same scope and sub-scopes. cmake. The name of the file set to create or add to. Run CMake with one of the following command signatures to specify the source and build trees and generate a buildsystem: cmake [<options>] -B <path-to-build> [-S <path-to-source>] New in version 3. The named <target> must have been created by a command such as add_executable() or add_library() and must not be an ALIAS target. All commands between foreach and the matching endforeach are recorded without being invoked. Learn from the CMake developers at Kitware through The command adds header files to the PRECOMPILE_HEADERS and/or INTERFACE_PRECOMPILE_HEADERS target properties of <target> . If you were to run cmake -L or cmake -LH, you would see all the cached variables and descriptions. But calls it in form set(. 12 and below has no built-in support for this. For general information on variables, see the Variables section in the cmake-language manual. Run the cmake executable or the cmake-gui to configure the project and then build it with your chosen build tool. Exercise 1 - Creating a Library. Learn how to set and use local, cache, and environment variables in CMake, as well as properties attached to targets and files. May 7, 2015 · CMake 3. $ mkdir build. Boolean toggle to make CPack use DESTDIR mechanism when packaging. 2 -D CMAKE_CXX_COMPILER=g++-4. Properties on Source Files. answered Jul 6, 2023 at 6:14. Next, the new library target is linked to the executable target using target_link_libraries(). This variable is always set by CMake to the CTest command that came from the CMake installation used to build the project. The details of this project are not important. The <type> must be specified as one of: Boolean ON/OFF value. Open the Command Palette ( ⇧⌘P (Windows, Linux Ctrl+Shift+P)) and run the CMake: Quick Start command: Enter a project name. 17: If the project() command specifies <PROJECT-NAME> as its project name, include the file (s) and module (s) named by CMAKE_PROJECT_<PROJECT-NAME>_INCLUDE_BEFORE, if set. You can specify as many commands as you want for a custom command. CMAKE_PROJECT_DESCRIPTION. Contents. Projects configured to use the vcpkg toolchain file (via the CMake setting CMAKE_TOOLCHAIN_FILE ) can find libraries from vcpkg using the standard CMake functions: find_package() , find_path() , and find_library() . Each element can be set to one of the following: ON: Corresponding flag is selected. Jan 5, 2013 · 1. set 的值 <value> 表示可以给变量设置0个或者多个值，当设置多个值时（大于2个），多个值会通过 分号连接符 连接成一个 Feb 23, 2016 · If you have generated solution files with default build type=Debug and want to build it using cmake --build use --config Release just after --build option. See also the set_property(DIRECTORY) command. 3. cpp. There is a choice of when the custom command should be executed. That call checks whether the variable is already defined (e. Some generators are tied to a specific compiler; for example, the Visual Studio 19 generator always uses the Microsoft Visual Studio 19 compiler. This variable holds the description of the project as specified in the top level CMakeLists. For example, if you only want to install the Development component, run cmake-DCOMPONENT=Development-P cmake_install. The first one you use CMAKE_EXPORT_COMPILE_COMMANDS ON in your CMakelists. This can be useful for project-wide settings. You can use any prop value pair you want and extract it later with the GET_TARGET_PROPERTY command. Apr 14, 2014 · To do this, CMake should be passed the command line arg -E. Unleashing CMake's Potential: The set_property () Command Explained. ANY: The two possibilities ( ON and OFF) will be searched. Next, the source and binary directories are specified. Try: cmake -DMY_CACHE_VAR="command line" -P cache. For earlier versions of CMake, use LINK_FLAGS property instead. get_cmake_property(<variable> <property>) Gets a global property from the CMake instance. For the very first project() call only: Set a CMake, cache or environment variable to a given value. Adding a Library (Step 2) Adding Usage Requirements for Library (Step 3) Installing and Testing (Step 4) Install Rules. $ cd Help/guide/importing-exporting/MyExe. If the property is not found, <variable> will be set to NOTFOUND . The first argument specifies the variable in which to store the result. The initial content from the cached CMAKE_CXX_FLAGS variable is a combination of CMAKE_CXX_FLAGS_INIT set by CMake itself during OS/toolchain detection and whatever is set in the CXXFLAGS environment variable. string (TOLOWER <string> <output_variable>) ¶. Aug 15, 2017 · A certainly pedantic comment is that I consider this a bug in cmake: when I ask for C++11, C+14, C++17 I want cmake to set all flags that are needed to make the compiler conform, and that includes the value of the __cplusplus macro. The system used to build the software will be called the “build host,” and the system for which the software is built will be called the “target system” or “target platform. To prevent the cmake foreach to treat each value in the path as a list you can use a bracket argument like : Nov 29, 2011 · # Notice name prefix of this variable, set by CMake according # to value given with "project()" in the root CMakeLists. The cmake output: At last, the source_list is:"nothing" Someone suggested that to use macro instead of function, but I do need use local variable, so I need to use the function instead of macro. Get a property. These generators store CMAKE_MAKE_PROGRAM in the CMake cache so that it may be edited by the user. Cross Compiling With CMake. If you know that you will always have CMake 3. CMAKE_BUILD_TYPE Debug CMAKE_CONFIGURATION_TYPES Debug;Release;MinSizeRel;RelWithDebInfo CMAKE_EXPORT_COMPILE_COMMANDS ON CMAKE_INSTALL_PREFIX C:/Program Files/My_Project This is on windows, I reckon that it would be /usr/cmake/My_project on linux. It is a basic relocation mechanism that should not be used on Windows (see CMAKE_INSTALL_PREFIX documentation). It uses the generators concept from CMake to abstract package generation on specific platforms. This command can get properties for any target so far created. Step 2: Adding a Library. It must be one of the following: Scope is unique and does not accept a name. Properties on Targets. CPACK_SET_DESTDIR. A config-file package is a set of files provided by upstreams for downstreams to use. ├── cars. Jan 27, 2016 · environment variables SET in the CMakeLists. $ cmake -DVARIABLE=value path/to/source You can set a variable after the initial `CMake` invocation to change its value. Create a CMake hello world project. Similar to the set() command, the list command creates new variable values in the current scope, even if the list itself is actually Generate a Project Buildsystem ¶. It provides a powerful way to manage the build process across different operating systems and compilers. You can add more configurations by choosing the green plus sign. Use external with command-line generators like Ninja. 1) ignoring any form of escaping. Then, run the install step by using the --install option of the cmake command (introduced in 3. cmake-variables (7) ¶. Properties on Installed Files. Aug 18, 2019 · set_tests_properties( mytest PROPERTIES ENVIRONMENT PATH=mypath mypath2) Escaping the ; won't work because the list is automatically expended in add_custom_command() in GoogleTest. ¶. Inside a CMake script, the CMake executable is referred to by ${CMAKE_COMMAND}, so the script needs to do: Depending on the command you execute, it may set trailing whitespaces to the variable. Such compile flags are added even if the compiler supports the particular feature without the flag. Use the set command to set variable values. vz jg av pf le bj nh tq al hw