Cmake set option for subdirectory. Accessibility of Targets.

Cmake set option for subdirectory txt which defines some executables. It is possible to run CMake from anywhere and still use a specific directory as the build directory using the undocumented -B option, but I wouldn't recommend you do that unless there is a good reason. In a single-configuration generator, you can just use CMAKE_BUILD_TYPE to make decisions at configure time. Sets properties of the current directory and its subdirectories in key-value pairs. Not a bad idea. Usage is as follows: cmake_add_fortran_subdirectory( <subdir> # name of Jun 25, 2015 · You can use the command line to set entries in the Cache with the syntax cmake -D var:type=value, just cmake -D var=value or with cmake -C CMakeInitialCache. Previous message: [CMake] ADD_SUBDIRECTORY() with a higher level directory Next message: [CMake] How the heck does one set options? Messages sorted by: May 17, 2019 · On Fri, May 17, 2019 at 2:55 AM junk email <mlg420sniperxxx69 at gmail. The -i option will cause cmake to interactively prompt for The third option seems like an easy way to quickly create a CMakeLists. Run "cmake --help-policy CMP0077" for policy details. Use the CMAKE_POLICY_DEFAULT_CMP0077 variable to set the policy for a third-party project in a subdirectory without modifying it. I want the targets in my external project to be in Apr 5, 2022 · Hi all! I have an external submodule that I want to include in my project. txt <-- works for all modules including the externals - external CMakeLists. I’d prefer to use something based on find_package instead. cpp main. net Sun Sep 18 15:54:51 EDT 2011. Nov 27, 2019 · In your code snippet I don’t see the call to FetchContent_MakeAvailable which behind the scenes will call add_subdirectory which will enable your variables in the project. by one . Each entry is the absolute path to the source directory (containing the CMakeLists. 2. Note that inter-target Nov 2, 2021 · 본문 제목 [CMAKE] option() / add_subdirectory() / target_link_libraries() / add_library() Nov 20, 2015 · The short answer is, that each sub-directory has it's own variable scope initialized with a copy of the current variable values at the time of the add_subdirectory() call. I’ve found, that CMAKE_RUNTIME_OUTPUT_DIRECTORY must do the thing, but it doesn’t work properly. The -i option will cause cmake to interactively prompt for Apr 1, 2011 · A possible approach to your concern might be the definition of directory-specific variables for flags and assign them to the CMAKE_<LANG>_FLAGS[_<CONFIG>] variables; see the following: # CMakeLists. add_compile_options("-Werror") add_executable(MyTarget foo. Add a subdirectory to the build. I try to define it Mar 3, 2022 · I would like to create a workspace like pattern. Nov 27, 2019 · CMP0077 is relevant here, if that policy is turned on (it was added in 3. See Also¶ define_property() get_directory_property() May 5, 2021 · I try to compile my Cortex-M0 project with CMake and arm-none-eabi-gcc (mingw32-make as make). This read-only directory property contains a semicolon-separated list of subdirectories processed so far by the add_subdirectory() or subdirs() commands. Note that inter-target Feb 27, 2015 · ADD_SUBDIRECTORY("src") ADD_SUBDIRECTORY("testpackage1") ADD_SUBDIRECTORY("testpackage2") What I get is: MYLIB_LIB_TARGET is not specified from the unit test project I think it's because the options are messing with the automatic dependency tree logic in CMake. I've never used nor noticed the -C option of make. Previous message: [CMake] Setting compile defs with: Cuda, add_subdirectory, and set_target_properties (COMPILE_DEFINITIONS) Sep 17, 2024 · The CMake set command provides two scope-related options. The value given to the FILE option must be a file name with the . You still need to create a library with the source files with add_library and link it to your executable with target_link_libraries. 13 there is an option to simply set a variable in the parent project, which sets the variable in all sub projects. txt Aug 23, 2017 · I would like to use a global set of flags for compiling a project, meaning that at my top-level CMakeLists. If it is a relative path, it will be evaluated with respect to the current directory (the Is there a way to set compile features globally for all C++ targets in the project, including subdirectories? Or would it be better to get rid of add_subdirectory and the object library, and just list all the individual subdirectory files in the top-level add_executable command? I'm new to CMake, so I don't know what the "best practices" are May 6, 2021 · In the interest of clarity and capturing requirements clearly, I’m attempting to use INTERFACE targets as a mechanism to group compiler flags, definitions, and linker options. The upper & lower level cmakelists. You can set a variable in the parent scope of a given scope by using the PARENT_SCOPE argument of the set command. Relative This is meant for use when the subdirectory contains a separate part of the project that is useful but not necessary, such as a set of examples. If i run cmake directly in the folder of the c project /TP is not set. txt, but in the separate directory, “bin” for example. add_subdirectory. / Added in version 3. This is meant for use when the subdirectory contains a separate part of the project that is useful but not necessary, such as a set of examples. By default the generated file will be called <export-name>. All source files are in the single parent directory now and CMakeLists issues seem to have magically vanished. txt <-- doesn't work If I use this code inside the root CMake file, it works fine, it enables the IPO and I can see the flag being used. txt and code files are located. txt file already setup. I do believe that variable (option) will populate to sub-directories since the toolchain file is included at the top level (typically on the command line) of the Sets properties of the current directory and its subdirectories in key-value pairs. May 21, 2021 · We have an uber-project that brings in several sub-projects via add_subdirectory(). If the above is indeed an issue, then may I suggest two additions to the add_subdirectory command. cmake [options] <path-to-source> cmake [options] <path-to-existing-build> Description. Added in version 3. with an environment variable pointing to the top of the build tree. 10 or older) without support for target_include_directories, you can also use the legacy include_directories instead: Nov 3, 2011 · On 11/03/2011 02:14 AM, Dan Kegel wrote: > Right, so, I have this fragment: > > set(gtest_force_shared_crt ON) > add_subdirectory(gtest) > > Oddly, when I run cmake May 1, 2021 · Edit after question update. I don't recommend doing this, since this prevents you from setting up the project with another configuration. A target defined in a subdirectory is globally accessible after the CMake configuration run passes through the subdirectory. Conan May 10, 2013 · I'll guess you mean ADD_SUBDIRECTORY(), as I can't find any ADD_DIRECTORY(). Historically, we have assembled CMake projects with liberal use of add_subdirectory. Jul 27, 2022 · cmake_minimum_required(VERSION 3. linuxchile. cpp (calls code from dataStructures/ and common/) CMakeLists. txt Nov 4, 2011 · [CMake] ADD_SUBDIRECTORY() with a higher level directory Michael Hertling mhertling at online. Accessibility of Targets. add_subdirectory creates a new directory "child scope". Sep 9, 2020 · What you’re asking for doesn’t really make sense. cmake_minimum_required(VERSION 3. Used to find and use external libraries or software packages. Jun 28, 2023 · But if the subdirectory is a third-party / "external" project, presumably you don't want to do that- in which case, if the variable needs to be set to something in particular, then set the variable to that value before calling add_subdirectory, and then restore the old value right after the call to add_subdirectory. At least it can be generalised if you replace . It may be set by cmake_policy() or cmake_minimum_required(). Jun 9, 2020 · An additional option is to go to your build folder and use the command ccmake . Version 3. 0 on a Windows32 and Makefiles for Unix). 9k次，点赞18次，收藏17次。option命令用于定义布尔型选项，可以在构建项目时启用或禁用特定的功能。option可以在CMake配置时被打开或关闭，从而影响构建流程。通过option，我们可以为用户提供灵活的配置方式，使其可以根据需要启用或禁用某些功能。不修改CMakeLists情况下启用或禁用 Feb 5, 2015 · set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O2 -Wunused-variable") # CMake will apply this to all targets, so this will work too. One of subproject is Botan library which has also it’s own CMakeLists. txt file with a length of a spaghetti, CMake: add_subdirectory() command. txt. See Also¶ define_property() get_directory_property() Jul 14, 2017 · I'm trying to organize the targets in my subproject (in this case poco), but I've come to find that properties can't be modified for ALIAS targets. This results in the UI of the Visual Studio IDE “Solution” pane showing all the targets in a flat list, including all the Sep 18, 2011 · [CMake] Problem with option() when in subdirectory Michael Wild themiwi at gmail. Sep 25, 2021 · Hello, I have C++ project tree with CMakeLists. txt in subdirectories with C++ sources/headers. I don’t yet know what exactly I want to set from the common Apr 21, 2020 · The set CMAKE_CXX_STANDARD is overriding the target compile option. Purpose. 28: Visibility can be set in other directory scopes using the following sub-option: DIRECTORY <dir> The test property will be set in the <dir> directory's scope. So the following two snippets are equivalents: Nov 2, 2023 · For a C++ project, for a single library and CMakeLists. It adds directories for the linker to search for library files. This is suitable to pass to the get_property() command DIRECTORY option. I have a library that I want to use in my project but want its files to be treated as system header files when included in my own code. For example, I might want to enable warning -Wunused-parameter for some files but not others. A target defined in a function or in macro is globally accessible after they are called. This is like the GUI but terminal based. This warning is for project developers. Feb 8, 2011 · cmake [options] <path-to-source> cmake [options] <path-to-existing-build> Description. 21) project(example) set(CMAKE_POLICY_DEFAULT_CMP0126 ON) set(example_SOME_OPTION "default-value" CACHE STRING "documentation") set(subdir_SOME_OPTION "${example_SOME_OPTION}") add_subdirectory(subdir) Jul 27, 2022 · 我希望将配置选项(一些字符串和BOOLs)传递给带有自己的CMake项目的子目录。我发现的所有三种方法都有很大的缺陷，那么正确的方法是什么呢？set(缓存)：您也需要在父项目中使用set( cache )，因为它的缓存变量和普通变量不以任何逻辑方式交互(而且它根据策略而变化)。此外，您还必须在父项目中 Jun 22, 2015 · Answering the revised question in your comment (how can I pass different values), so values other then CMAKE_BUILD_TYPE`:. In addition the CMAKE_GNUtoMS option is set to on, so that Microsoft . david at gmail. The "cmake" executable is the CMake command-line interface. An example is like so: add_library(my_specs INTERFACE) target_compile_definitions(my_specs INTERFACE MY_DEF=FOO) target_compile_options(my_specs INTERFACE -mfoo=bar) target_link_options(my_specs INTERFACE -motherfoo Feb 27, 2015 · ADD_SUBDIRECTORY("src") ADD_SUBDIRECTORY("testpackage1") ADD_SUBDIRECTORY("testpackage2") What I get is: MYLIB_LIB_TARGET is not specified from the unit test project I think it's because the options are messing with the automatic dependency tree logic in CMake. . txt that has add_subdirectory(blah/some_lib SYSTEM) some_lib itself uses its own cmake setup to build. Aug 23, 2017 · I would like to use a global set of flags for compiling a project, meaning that at my top-level CMakeLists. If I do it the other way around, add_subdirectory(dir2), then add_subdirectory(dir1), the value has not yet been set when I enter dir2. If that’s the case, then it is possible that a project with a number of subprojects may have option collisions. txt: CMAKE_MINIMUM_REQUIRED(VERSION 2. However, it would be more convenient if I could just do something like OPT=-O0 Nov 9, 2024 · CMake之ADD_SUBDIRECTORY语法解析举例参考 语法 add_subdirectory(source_dir [binary_dir] [EXCLUDE_FROM_ALL]) 向构建中添加子目录。source_dir指定源CMakeLists. lib files are created. neundorf-work at gmx. The first is to be able to specify multi-value default options in the add Sep 18, 2015 · My code is organized like this: cpp main. Note that inter-target This is meant for use when the subdirectory contains a separate part of the project that is useful but not necessary, such as a set of examples. I am experiencing something i can't understand about In addition the CMAKE_GNUtoMS option is set to on, so that Microsoft . As of CMake 3. txt and a number of direcotries with other cmake projects an would like to be able to build all of them by configuring from the workspace. Is there a way for me to work around this? Note, I originally just didn’t set the CMAKE_CXX_STANDARD at all. txt - src CMakeLists. Variables in CMake are directory, function, and block scoped. Typically the subdirectory should contain its own project() command invocation so that a full build system will be generated in the subdirectory (such as a VS IDE solution file). Several of these creates a large number of static library Targets which they then assemble into the dynamic libraries and executables t&hellip; The second option consists of rewriting explicitly the variables creating a directory called "build" and called cmake from that directory. Per the supported Dec 28, 2024 · Another option is to make it internal cache variable and it will be globally accessible/editable. com Sun Sep 18 08:42:49 EDT 2011. Several of these creates a large number of static library Targets which they then assemble into the dynamic libraries and executables that we actually consume in the uber-project. cpp -Wunused-variable) remove_flag_from_file(MyTarget bar. Jan 8, 2016 · This is a working example to demonstrate how you can override your subdirectory options from a parent project using a simple macro, more info at: http://edsiper. You would want CMake to generate makefiles or project files for all the examples at the same time, but you would not want them to show up in the top level project or be built each time make is run from the top. txt in the root and another CMakeLists. With target_sources you can do this: Sep 18, 2011 · Next message: [CMake] Problem with option() when in subdirectory Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] Hello, I noticed that option() values are not checked when the option() command is under a add_subdirectory() target. In a multi-configuration generator, multiple configurations are managed by the same buildsystem (e. txt (topmost CMakeLists file) build common CMakeLists. g. txt for all the projects. Feb 21, 2020 · Hi, I am currently unable to add a static c library (among other c++ targets) with add_subdirectory as cmake seems to set /TP (c++ mode) causing the compile to fail, even when explicitly setting LANGUAGE and LINKER_LANGUAGE to c. If a CONFIGURATIONS option is given then the file will only be installed when one of the named configurations is installed. find_package() Example. txt don't play well together. Here’s my directory structure: top src1 src2 src3 include libs blah some_lib In directory libs I have a CMakeLists. The CACHE option sets the variable in the CMakeCache, which results in it being set in all scopes. Sometimes, during debugging, I’d like to recompile just one of those subdirectories with a different optimization level for debugging. What is the correct pattern for doing this please? Dec 17, 2024 · thank you, execute process works every time. / $ cmake . It works but doesn't save you much typing. For compatibility with older versions of CMake, option is clearing the normal variable 'ENABLE_DATE_TESTING'. Jun 24, 2023 · As per this stackoverflow answer, it looks like subproject options may be global to the project itself. May 8, 2013 · It depends on the order of the add_subdirectory-calls, if I do the set( PARENT_SCOPE) in dir1, and add_subdirectory(dir1) first, then add_subdirectory(dir2), I get the value in dir2. cmake but the FILE option may be used to specify a different name. 8. But this does not seem to be the case. In its own CMakeLists. For linking targets built by the same project, this is unnecessary; for external projects that provide an cmake import script, this isn't necessary either. Usage is as follows: cmake_add_fortran_subdirectory( <subdir> # name of [CMake] Setting compile defs with: Cuda, add_subdirectory, and set_target_properties (COMPILE_DEFINITIONS) Brian Davis bitminer at gmail. Previous message: [CMake] Problem with option() when in subdirectory Next message: [CMake] linker default library path /usr/local/lib on OSX Messages sorted by: Mar 12, 2017 · Yes, I already assumed you meant that you were running CMake in the build directory rather than bin. Can be less modular than add_subdirectory() for managing complex projects. If the variable is project specific, you just set the variable: Jul 3, 2017 · Set a property for the current directory and subdirectories. I have two different targets (executables) in my project for which the submodule should be included, but for each Jan 16, 2014 · In terms of CMake, you'll have one CMakeLists. Is there a better way to add defines to just that subdirectory rather than… add_definitions(-DGTEST_HAS_PTHREAD=0) add_subdirectory(googletest) remove_definition… add_subdirectory(source_dir [binary_dir] [EXCLUDE_FROM_ALL] [SYSTEM]) Adds a subdirectory to the build. Two things must be done. txt (should be responsible for building Sets properties of the current directory and its subdirectories in key-value pairs. Only the CMake lists in main and main2 will actually call target_link_libraries(). I have some subdirectories that As of CMake 3. Instead, I had an add_compile_options(-std=gnu++1y) set in the top level project. Previous message: [CMake] Problem with option() when in subdirectory Next message: [CMake] Problem with option() when in subdirectory Messages sorted by: Apr 29, 2020 · Setting SOME_VAR like that will not always set the value in the case that the variable has already been set previously in CMake configuration or it has been passed via command line. txt file I have specified: ADD_DEFINITIONS ( -Wall -Weffc++ -pedantic -std=c++0x ) Howev Jan 4, 2023 · Hi all, fairly new to cmake. txt file in each directory, including at the root, for a total of five. CMake must already know about this directory, either by having added it through a call to add_subdirectory() or it being the top level source directory. Jul 19, 2011 · Introduction: I am trying to use CMake to obtain cross platform compilation scripts (for VS 9. See Properties on Directories for the list of properties known to CMake and their individual documentation for the behavior of each property. vcxproj file in the binary directory), so having different binary directories for different configurations is impossible. i also want to add ExternalProject works too but sometimes variables don’t get set when they are passed to the externalproject through CMAKE_ARGS without changing any files and i don’t know of a way to force variables like i would with set( [FORCE]) but for external project so im not sure why that happens. com> wrote: > Hello, > > I am trying to understand how to build a subdirectory project that has its > own CMakeLists. txt file, I would like to set compiler options differently for sets of files. # === IPO === if Apr 12, 2011 · Adding a subdirectory does not do much more than specify to CMake that it should enter the directory and look for another CMakeLists. Aug 1, 2016 · I want to modify a default option in the subdirectory, without affecting the parent project. So that I have a directory which contains a CMakeLists. txt:8 (option): Policy CMP0077 is not set: option() honors normal variables. de Thu Nov 3 20:02:31 EDT 2011. txt文件和代码文件所在的目录。 Feb 23, 2021 · Run "cmake --help-policy CMP0077" for policy details. / Oct 25, 2021 · It seems to be intended. Jul 19, 2015 · One issue may arise if you want to control the generated executable output path such that it's not hidden in the deeply nested cmake intermediate binary tree; the answer is you can set the variable CMAKE_CURRENT_BINARY_DIR to customise the executable output absolute path, or just use cmake -E and add_custom_command command to copy the Feb 21, 2008 · On 2008-02-21 08:25+0100 Vandenbroucke Sander wrote: > Hi, > > I want to pass a variable to CMakeLists. 1 there is a new way to add source from subdirectories: target_sources Say you have root_dir and root_dir/sub_dir and source files in both. cmake extension. The -i option will cause cmake to interactively prompt for That's actually a better answer than your main answer. First add the directory to be included: target_include_directories(test PRIVATE ${YOUR_DIRECTORY}) In case you are stuck with a very old CMake version (2. The CACHE option will not set a variable that already exists in the CACHE unless the FORCE option is specified. You can unset entries in the Cache with unset( Primarily for including CMake code, not for building external projects. If it is not set, CMake warns, and uses OLD behavior. The source_dir specifies the directory in which the source CMakeLists. cpp Jan 15, 2024 · The PROPAGATE option ensure the listed variables are propagated to the parent scope of the scope created by the block() command. The user is expected to define this environment variable before using add_subdirectory. There's no extra machinery for this. cmake. com Mon Aug 16 18:21:47 EDT 2010. There is an option to go back and change the CMakeLists. Mar 14, 2025 · When a variable that is already set is set again in a subdirectory it overrides the value in that scope and any deeper subdirectories. The top one will just include each subdirectory, while the remaining four will be responsible for building each binary. cpp bar. txt file for that subdirectory. Something like the following: In the subdir CMakeLists. Also I would like to set some things from the common CMakeLists. Everything is Ok, I get my hex and binary as result, but I want to have them not in the main directory with CMakeLists. – Sep 18, 2011 · [CMake] Problem with option() when in subdirectory Alexander Neundorf a. 13. Oct 26, 2024 · Hello, is there any option perhaps to set a DEFER CALL in the scope of the directory that will be added with add_subdirectory()? Or if there is any other way to “inject” some CMake module or code into the scope of the add_subdirectory()? Because, I’m adding a various number of project extensions with add_subdirectory() and trying to do as little code repeating inside the extension’s Jan 20, 2012 · Since CMake 3. This method is generally the most common option documented in projects using CMake. This obviously won't help with an installation script but at least it can be run without a UI. See also the set_property(DIRECTORY) command. Subprojects are added with command add_subdirectory(). Use the cmake_policy command to set the policy and suppress this warning. 13) then setting variables before calling FetchContent_MakeAvailable will cause calls to option in the subproject to basically do nothing. Previous message: [CMake] Problem with option() when in subdirectory Next message: [CMake] Problem with option() when in subdirectory Messages sorted by: Sep 18, 2011 · [CMake] Problem with option() when in subdirectory David Demelier demelier. Jul 17, 2020 · Hi there, I’m having some problems when I try to check/enable IPO only for my application! This is the project structure: project CMakeLists. Dec 21, 2024 · I use cmake to compile projects with many subdirectories that can be built independently. See Also¶ define_property() get_directory_property() May 7, 2019 · Per the set_directory_properties docs, properties set on the directory are supposed to propagate to subdirectories: Set a property for the current directory and subdirectories. In my project I have a root CMakeLists. Sep 21, 2023 · I have an environment where multiple products on multiple platforms build using a variety of libraries. txt's in sub directories: > > Top directory CMakeLists. The upper cmake is running the lower cmakelists in the scope of the upper. txt file). cpp) apply_global_cxx_flags_to_all_targets() remove_flag_from_file(MyTarget foo. May 1, 2020 · I am adding google test to my project as a sub directory. Jan 25, 2024 · My solution - - Get rid of subdirectories that contain additional source files. I expected This is useful for having CMake create makefiles or projects for a set of examples in a project. These packages often come with their own CMake configuration files that find_package() can locate and use. cl/blog/2016/01/08/cmake-override…ectory-options/ $ cmake . The CMake set command provides two scope-related options. The following steps will be used to create our new project $ mkdir build $ mkdir bin $ cd build $ cmake . I use target_compile_options to configure some settings like warnings for these executables. txt it uses the value of an environment variable to define some macros and include some modules. If just use set() before add_subdirectory(), that will create another variable in the parent project that I don't need, and may cause a conflict if there is a variable or option with same name in the parent project. It still doesn't answer the question from the cmake side though. 13 introduced CMP0077: The option() command is typically used to create a cache entry to allow users to set the option. The problem is that target_compile_options(Botan PUBLIC…) used in Botan CMakeLists. 0) project(foo CXX) set_property(DIRECTORY . Project configuration settings may be specified on the command line with the -D option. CMake Warning (dev) at date/CMakeLists Jun 12, 2024 · 文章浏览阅读2. 8 FATAL_ERROR) PROJECT(TOPLEVEL C) # Define the project's flags: SET(${PROJECT_NAME}_C_FLAGS "-O3" CACHE Apr 7, 2021 · -- POLICY is NEW -- POLICY is CMake Warning (dev) at project/CMakeLists. Consider: CMakeLists. add_subdirectory(source_dir [binary_dir] [EXCLUDE_FROM_ALL] [SYSTEM]) Adds a subdirectory to the build. PARENT_SCOPE sets a variable into the parent scope, and not the current scope. The usual way is to run CMake from the build directory. This is basically what you've tried, but now it is possible. You're setting the build type to Debug in the CMakeLists. To me this suggests that properties set in a parent directory should also be inherited to all subdirectories. txt are also set for builds of another Dec 29, 2021 · (target_)link_directories() should only be used in rare circumstances. Additionally cmake [options] <path-to-source> cmake [options] <path-to-existing-build> Description. com Wed Sep 21 15:50:43 EDT 2011. txt file. Use -Wno-dev to suppress it. Modifying tests in other directories is certainly possible, but it doesn’t look trivial (the directory scope tree would need walked to find the test, though whatever mechanism guarantees test name uniqueness could be reused (and enhanced if necessary) to do a more direct lookup. Nov 10, 2022 · Is there anyway to set the options of a subdirectory? So I have a project that depends on a subproject, the subproject has an option: OPTION(WITH_FUNCTION_X "enable X functionality" ON) This policy was introduced in CMake version 3. It may be used to configure projects in scripts. Avoid using different APIs for adding modules depending on whether we are developing using entire tree or using a package manager (e. txt there. gxnh cymto xvtfg sloyhb vceskz vjqct kahmmuzf yfzxl ujdvn tmqh gelv khwzyjg xfg ubo euz