Cmake set compiler for target. You should consider add_compile_options instead:.

Cmake set compiler for target PRIVATE and PUBLIC items will populate the How do I specify debug and release C/C++ flags using CMake? The modern practice is to use target's and properties. If you define a target in cmake after setting variable, cmake initializes the properties of the target with the value of the variable, if you specify the right build type. 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. It's uses a "fake" cmake toolchain so CMAKE somehow "believes" it's on 32bit system, so no additional modifications are needed inside your cmake project files, no special configurations, no special settings (well almost). Since in just one of the many executable that the project builds, I need to set the \MP flag to false (or disable it because I get errors importing a . 7 or newer, you can adapt apply_global_cxx_flags_to_all_targets() to take a list of CMAKE_<LANG>_COMPILER_TARGET¶. However, this extra custom command runs a script (that is not generated; it's checked into the codebase), and I want the target to be considered out of date if that script changes so it will be rebuilt properly. I believe target_compile_options is preferred. These compiler drivers support a command-line argument to specify the target to cross-compile for. Adds preprocessor definitions to the compiler command line. Variables in toolchain file are not "refreshed" when you re-run cmake. Arguments to add_compile_options may use generator expressions with the syntax $<>. Changing those compiler/linker options locally you need config-specific target properties or generator expressions. How can I build these two with one single cmake --build command? I was thinking of using ExternalProject_Add() in the top-level CMakeLists. CMake doesn't support setting C++17 flags in VS directly yet (see How to enable /std:c++17 in VS2017 with CMake) so I need to manually replace it. txt, and you want all targets in this file to be compiled with another compiler, you can just set the variables by hand. How did you verify that the options weren’t set? Variables such as CMAKE_CXX_FLAGS will not be modified by target_compile_options, you’d have to check the actual options on the target via get_target_properties on property COMPILE_OPTIONS (or by checking the actual compiler I have a C project which uses CMake to build with three targets for each library type (static, dynamic and shared): add_library(contact-static STATIC EXCLUDE_FROM_ALL lib/contact. cc) target_link_libraries(solver PRIVATE "${OpenMP_CXX_FLAGS}") target_compile_options(solver PRIVATE "${OpenMP_CXX_FLAGS}") This may not work with some compilers; this is partly why CMake revamped its OpenMP support in CMake 3. 12, v3. using this technique and cmake 3. DEFINE_SYMBOL sets the name of the preprocessor symbol defined when compiling sources in a shared library. 2 or newer (testing in 3. target test1". COMPILE_DEFINITIONS is simply the newer, more flexible and fine-grained way to do it. But what happens if you have more than one file with dependencies? You need to be able to tell CMake about the I've got a CMakeLists where I want to build some targets using the dynamic version of the C runtime, and some other targets using the static version. I've already tried several compile flags to cut size, etc. If you have different targets to support, create different toolchain and use the out-of-source-build with CMake. From the docs: The /MP option can reduce the total time to compile the source files on the command line. For directory-wide settings, there is the command add_compile_options(). In our case it makes sense. Here is an example: add_library(foobar) # Add this compile definition for debug builds, this same logic works for # target_compile_options, target_link_options, etc. target_link_libraries: Other targets; can also pass library names directly; target_include_directories: Include directories; target_compile_features: The compiler features you need activated, like cxx_std_11; target_compile_definitions: Definitions; target_compile_options: More general compile flags; target_link_directories: Don’t use, give AFAIK CMake does not allow to specify compile options per file. I made a very simple "Hello world" project and the problem is : first time I run make after cmake -G "Unix Makefiles" -DCMAKE_BUILD_TYPE=Release . PRIVATE and PUBLIC items will populate the These flags influence how the compiler behaves when compiling the source files that belong to that target. add_library(common INTERFACE) target_compile_definitions(common INTERFACE MYDEFINITION) The neat thing is you can also put other things like warning settings: add_library(common INTERFACE) target_compile_options(common INTERFACE -Wall -Wextra -Wshadow -Wnon-virtual-dtor -Wold-style-cast -Woverloaded-virtual -Wzero-as-null-pointer-constant -pedantic -fPIE -fstack-protector-all -fno-rtti ) target_link_libraries(foo PRIVATE common) target_link_libraries(bar PRIVATE common) CMake target compile tl;dr. In version 3. 12 or newer. I would like to set different COMPILE_FLAGS for these projects. In earlier versions you probably don't want to use set_target_properties as is, since it overwrites any defines you set previously. So it seems Im stuck. You need to specify the C/CXX compilers, Linker etc. add_executable(MyProgram myprogram. The CMAKE_SIZEOF_VOID_P gives different sizes for me depending whether I generate with -G "Visual Studio 11 Win64", or just with -G "Visual Studio 11" - which I am using to determine the bitness of the target. You can override the Specifies compile definitions to use when compiling a given <target>. I want to replace this arrangement with CMake, running on Windows. For example, to set compiler flags for a target named "my_target" to enable C++11 support, you can use the following code: This will Now you know how to compile a single file using three lines of CMake. cpp_info["library1"] etc. txt files in the world use add_definitions, it simply would not be wise to remove Hello, I am working on a project for an embedded MCU (STM32). set_source_files_properties(${TARGET_SOURCE_FILES} PROPERTIES COMPILE_FLAGS "-fexceptions") Code above is used to open exception handling for single file while -fno After my program is linked I need to perform some post-processing on it. Because this needs to be set per Specifies compile definitions to use when compiling a given <target>. -- The C compiler identification is GNU 7. Arguments to target_compile_features may use generator expressions See the cmake-generator-expressions(7) manual for available expressions. See Also¶ define Hallo, I have a question about setting the compiler options for warnings. with add_library, and add the compile options to this target. c) target_link_libraries(contactbook contact-static) The basic flags used for the target are fixed quite early in a project - normally. If the project needs to add flags project-wide, it can use add_compile_options() from the top level CMakeLists. The cleanest approach may be to create a separate lib target, one catered for TargetA and another catered for TargetB. The named <target> must have been created by a command such as add_executable() or add_library() and must not be an ALIAS target. According to the documentation, if you only add the PUBLIC keyword to the target_compile_options after the target's name, it should be fine. So, after removing the only entry from the list I will get an empty list. cc` Is there a way to allow users to specify different flags while using target_compile_options()? add_definitions has existed in CMake since the very first build of CMake came online more than a decade ago. However get_target_property(my_compile_flags mylib COMPILE_OPTIONS) to retrieve the list of See Also. : set_source_files_properties(compile_me_as_objc. This property holds a semicolon-separated list of options and will be added to the list of compile flags when this source file builds. I've read multiple times, that one should not manually set CMAKE_CXX_FLAGS - First time hear about that. txt which I cannot edit, can I set CMAKE_TRY_COMPILE_TARGET_TYPE to be STATIC_LIBRARY while configuring that file?. It’s normal to add preprocessor definitions to control the compiling process. json”, which CMAKE can generate, it does not include compile commands for header files, nor can I find a way to make it do so ( I even tried a custom extension, . The solution is to use the COMPILE_LANGUAGE generator expression (introduced with CMake 3. The final set of options used for a target is constructed by accumulating options from the current Things you can set on targets. It will require CMake 3. txt that isn't absolutely required to build your project. target_compile_options() (for one single target) add_compile_options() (for all targets) The documentation of last version has not changed a Don’t modify CMAKE_CXX_FLAGS in your project. add_compile_options(myprog PRIVATE Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company I updated the versions of GCC and CMake. If you take the EXPORT_COMPILE_COMMANDS and use it with cmake 3. e. Since CMAKE_CXX_FLAGS occur before the flags set in target_compile_options. rpp, as a C++ source file ). 66 My CMake project builds an executable consisting of C and C++ source files: add_executable(myAP main. It We develop an application that runs on Intel processor under Linux using a Wind River toolset. c file). What is The command execute_process performs actions immediately, while cmake is run. c I have a CMake build with a bunch of different targets A, B, C, etc. With make this problem seems to be possible to . cpp file requires the -std=c++11 flag, but gcc does not recognise that flag and so it should not be used for the . 22. 1), following OP's example CMakeLists. The same was true for a List of additional options to pass to the compiler. and a compiler, which could be gcc, llvm, cl. cpp) The accepted answer is still working but outdated since 2013. Then these copies simultaneously compile the source files. These options are used when compiling targets from the current If so, yes, add_definitions affects on all targets in the current scope, but target_compile_definitions affects only on specific target. I need to set different compiler options (using target_compile_options) depending on which toolchain is used. txt or in the toolchain file. My current fix is as follows I have a C project in Cmake in which I have embedded cuda kernel module. Warning flags are not in this set, so they belong here. 2) No, these are initialized with the directory property via the add_compile_options before defining the target. This would violate the scope of these commands. That is not in the script and doesn't use CMAKE_CXX_FLAGS_RELWITHDEBINFO at all. That said, you can use the ExternalProject module to set up sub-builds which can each use a different toolchain. 9. For this reason, SET(CMAKE_GENERATOR_PLATFORM x64) (or in your case, x86) should do the trick in a Toolchain file. Since CMake-2. They will always both be around: since 99%+ of the existing CMakeLists. I’d like to be able to build unit tests for my project I would like to include a . The best you can do is to create a target for the files you want to compile with -fno-rtti, e. -O3, -DNDEBUG for release build). The -D parameter is simply setting this value on command line instead of from within the MyToolChain. This is simply the current directory CMake is processing (i. For file-specific settings, there is the source file To export individual targets in CMake, you will have to replace self. They are also added to the COMPILE_DEFINITIONS target property for each target in the current CMakeLists file. But for now, I’m utterly confused: If I set the compiler through command line instead of “set” command in my CMakeLists, my project doesn’t link anymore with the C++ runtime (undeifned reference to all of std’s symbols). What is the Right Way? Is it this?: target_compile_features(Foo PUBLIC cxx_std_20) where Foo is the name of my target (and same for every target?) If I do that, do I the remove all the set (CMAKE_CXX_STANDARD*) lines I am not sure which cross compile toolchain you are using. I can invoke the cross-compiler from Windows cmd prompt. If it is specified with full path, then this path will be preferred when searching for the C++ compiler and the other tools (binutils, linker, etc So the warning setting /W3 is picked up from the CMake variable CMAKE_CXX_FLAGS_INIT which then applies to all CMake targets generated in the project. cpp In case you want to set defines per target: Since 2. cpp ${INCLUDE_COMPILER_STRING} /P WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}/Path/Here COMMENT "Preprocessing to I am trying to cross-compile a project for an ARM target, using the GCC cross compiler. As you noted, the highly flexible ExternalProject module runs its commands at build time, so you can't make direct use of Project A's import file since it's only created once Project A has been installed. The INTERFACE, PUBLIC and PRIVATE keywords are required to specify the scope of the following arguments. A mypkg::mypkg target is still created by default, which simply depends on each of the components. Otherwise, you inflict potentially invalid flags on your end-users. 0, targets can specify INTERFACE_COMPILE_OPTIONS. Consequently, the total time to build the source files can be significantly reduced. See the cmake-generator-expressions(7) manual for Hi again, Having a build tree per compiler seems to be a good idea. You can use any prop value pair you want and extract it later with the get_property() or get_target_property() command. The options will be added after target-wide options. add_definition(-Dfoo -Dbar) # Common sources for any library set(LIB_SOURCES ) # The library specialized for exe1. This command has been superseded by alternatives: Use add_compile_definitions() to add preprocessor definitions. Finally, I tried removing this defintion: Second - since CMake v3. This specifies the C compiler executable as either a full path or just the filename. This is surprisingly common with warning flags. So, why does CMake add quotes to my compile options? This solution will allow you cross-compile your cmake project on a linux64 host targeting 32bits, on systems with multi-arch support. For older versions you can "abuse" add_definitions(). , My add_custom_command wouldn't generate output to the makefiles unless the OUTPUT's from @JohnStrood The difference is at scope level. This CMake command allows you to set compiler flags specifically for a particular target I have tried: add_compile_options("$<$<CONFIG:DEBUG>:-Og>") but that does not seem to work. (For example, compiling the . You should consider add_compile_options instead:. Option De-duplication. if gcc is the compiler, I want to pass -DHAVE_CONFIG_H to the compiler. – RAM. If you include external libraries this way you may get lots of warnings if that library was designed with different warning level. txt to add the lib folder and re-configure with the native compiler at the build CMake only keeps one set of compiler properties which is shared by all targets in a CMakeLists. How can i set MinGW as my default compiler so that i do not have to worry about setting compiler in the CMakeLists? That is, because add_compile_options is used to add compile options to the COMPILE_OPTIONS list, a semicolon seperated list, whereas add_target_options adds options to the INTERFACE_COMPILE_OPTIONS of datatype property. This variable may only be set in a toolchain file specified by the CMAKE_TOOLCHAIN_FILE 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. 13. 8 request an entire standard using target_compile_features(), in which case the only difference from setting CMAKE_CXX_STANDARD is that the standard is only applied Arguments to add_compile_definitions may use generator expressions with the syntax $<>. I'm using CMake version 2. To control the warning level on the CMake project or target level, one can alter the CMAKE_CXX_FLAGS_INIT variable in the CompilerOptions. Definitions are specified using the syntax VAR or VAR=value. Compile options, definitions, include directories, source files, link libraries, and link options are properties of targets. add_executable(myapp myapp. set (CMAKE_CXX_STANDARD 17) set (CMAKE_CXX_STANDARD_REQUIRED ON) but I get the sense that's not the Right Way to do it. cpp DpdkSock. org. The following command sets C99 as a minimum requirement for target:. 8 on WinXP SP3. with the details for each of the targets filled in. txt has the following:. txt and add set_target_properties(test1 PROPERTIES EXPORT_COMPILE_COMMANDS on), you still get CMAKE_<LANG>_COMPILER_TARGET¶ The target for cross-compiling, if supported. 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. It smells you are confused between CMake generator, which could be Visual Studio, MinGW, Makefile, Ninja, etc. cpp ) SET_TARGET_PROPERTIES( foo PROPERTIES COMPILE_FLAGS -Wall ) , in which neither worked. It is better to set these using add_compile_options() and add_compile_definitions(), and you can use generator expressions to control which options apply to the Debug or Release configurations. txt, etc. This needs to be done almost universally to any static library. See the cmake-compile I have been using CMake as a build system generator to cross compile for ARM Cortex M microcontrollers for a while now, and to great success (well, honestly it was only successful after I bought @craig. See the cmake-buildsystem(7) manual for more on defining buildsystem properties. The syntax for the command is to list all the targets you want to change, and then provide the values you want to set next. It also creates other build targets, such as the 'all' build target, which builds everything. The CMakeLists. And I am trying to set up unit testing with googletest which builds and runs natively. CMAKE_CXX_FLAGS are not altered by the other commands or vice versa. cpp ) # Create the 'lib' target to link to TargetA. How to add definitions. Commented Aug 23, cmake target_compile_options worked but add_compile_options did not. From the cmake manual: add_compile_options. By default, if the target is not specified, the 'all' target is executed, meaning both hello and goodbye are built. Here is how I set it: add_library(project_options INTERFACE) target_compile_features(pr This is working as designed. cpp) add_executable(goodbye goodbye. 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 生成器表达式简单来说就是在CMake生成构建系统的时候根据不同配置动态生成特定的内容。条件链接，如针对同一个编译目标，debug版本和release版本链接不同的库文件条件定义，如针对不同编译器，定义不同的宏所以可以看到，其中的要点是条件，之所以需要自动生成，那绝大多数时候肯定是因为 My usual solution to set properties for all target is simply to add a common target, that has interface properties I want to add to all targets. I want to pass --ptxas-options=-v only to nvcc in-order to view Number of registers usage per thread and shared Memory usage per block. for more on defining buildsystem properties. If you use target_compile_options - cmake will try to use double /W* flag, which will Two things must be done. @KarmilCuk thanks for sharing the linkI had found the answer myself at about the same time you posted that linkHowever I don't know how I will pass different compile flags in the same target like in my casein each target 2 compilers are being used. 8. add_compile_options() Useful for Setting the following variables defines what compilers to use for the target system. Whenever i run my CMakeLists script by default CMake use Visual Studio 10 compiler. Latter command allows for files to compiled using a different language; i. cpp-file). cpp) then CMake creates 'build targets' for each executable. But there are two things you have to differentiate in CMake: the first call to generate the build environment and all consecutive calls for regenerating that build environment after changes to your CMakeLists. If you need to leave out some of those options for a specific target, then that suggests those flags shouldn’t have been applied add_executable(hello hello. When building with GCC, I need to specify the -Wno-invalid-offsetof compiler option. 7. 4. CMake automatically sets this target as a dependency. E. Call to set_target_properties() fails with error: set_target_properties called with incorrect number of arguments. currently the same flags are being passedbut in future I might need to have different flags for the C compiler and Maybe not. Now I may have run into an issue with the extensibility of the cross-compilation support. The application is built on Windows using an Eclipse-based IDE, CDT and gnu make, using the Wind River cross-compiler. Here are some of the possibilities (excluding the more complex toolchain variants): I'm writing a project using the Slate linear algebra library in C++, with MKL, MPI and OpenMP as dependencies. 在cmake脚本中，设置编译选项可以通过add_compile_options命令，也可以通过set命令修改CMAKE_CXX_FLAGS或CMAKE_C_FLAGS。使用这两种方式在有的情况下效果是一样的，但请注意它们还是有区别的： add_compile_options命令添加的编译选项是针对所有编译器的(包括c和c++编译器)，而set命令设置CMAKE_C_FLAGS或CMAKE_CXX_FLAGS target_compile_definitions, specifying which compiler definitions to use. The cxx_std_17 feature is documented here. Disclaimer, If you on the other hand set CMAKE_CXX_STANDARD, then the requested standard, if supported by CMake, is applied project wide (for all targets). You can’t mix different toolchains for different targets. 此命令可用于添加任何选项。但是，对于添加预处理器定义和包含目录，建议使用更具体的命令 target_compile_definitions() 和 target_include_directories() 。; 对于目录范围的设置，有命令 add_compile_options() 。; 对于特定于文件的设置，有源文件属性 COMPILE_OPTIONS 。; 此命令为目标中的所有语言添加编译 Arguments¶. add_library(lib_exe1 SHARED ${LIB_SOURCES}) # Library-specific definitions I am writing a shared library in C++ as a CMake project in Visual Studio 2022. Just for reference, I’m guessing this is related to the problem in this post?. scott 's book). cmake, CMakeLists. This could look something like this: set(LIB_SOURCES Class1. Whatever approach you would use, the COMMAND's for them means just the shell commands for execute. Commented Oct 12, 2015 at 9:39. Note. The target for cross-compiling, if supported. how does rpc get at the header files of utils so that it will compile prior to link? – Sam Liddicott. cpp and . The simplest example for your original C++1x flag is: add_compile_options($<$<COMPILE_LANGUAGE:CXX>: See Also¶. This command adds compile At the root file I have this: set(CMAKE_CXX_FLAGS "-Wall -Wimplicit-fallthrough -Werror=return-type") I’d like to completely replace that in a subdirectory, for a certain target. What I was hoping I can do to stage things is add a proxy The named <target> must have been created by a command such as add_executable() or add_library() and must not be an ALIAS target. cpp) target_include_directories(myapp SYSTEM PRIVATE "extern/lib/include" ) The LINK_FLAGS property can be used to add extra flags to the link step of a target. where the current CMakeLists. There is no global version of it and is not found. To support cross-compiling for a specific software project, CMake must to be told about the target platform via a toolchain file. The final set of options used for a target is constructed by accumulating options from the current Let me paraphrase what I'm saying, OP is saying "I'm looking for a way to specify that I'm only interested in e. cmake by adding the following Since cmake 3. Call get_target_property first instead, then merge with previous values. If you want to include Project A's import file, you'll have to install Project A manually before invoking Project B's # Works only in new CMake versions target_compile_options(myproject::extra INTERFACE /W4) # Equivalent which works in any CMake version set_property(TARGET myproject::extra PROPERTY INTERFACE_COMPILE_OPTIONS /W4) Share. The command target_compile_definitions() adds target-specific definitions. This is even true for e. If you have small number of possible compile definitions' set for a library, you may define library target for every set: # Common definitions for any library. In modern CMake, manually manipulating the CMAKE_<LANG>_FLAGS_<CONFIG> variables is often discouraged. 12 and later, use target_compile_definitions instead of add_definitions for better target-specific control. I read in the documentation this: if (MSVC) # warning level 4 add_compile_options(/W4) else @MitchLindgren CMake Toolchains are special because they're processed before anything else. txt may have to be adjusted. Note: With @einpoklum for our internal build system, used by everyone in our company for all our builds, we set CMAKE_CXX_FLAGS directly, so they are the same for all targets. So taking your second approach and How can I set specific compiler flags for a specific target in a specific build configuration using CMake? I would get: This particular solution(?) will work both for targets and for single translation units (a single . However, this builds all ta But I wanted to add that setting CMAKE_CURRENT_SOURCE_DIR doesn't work because this is a CMake set variable. Function-style The COMPILE_FLAGS property of either a target or a source used in that target doesn't evaluate to the full list of build flags that will be used. Contents of COMPILE_OPTIONS may use "generator expressions" with the syntax $<>. How can I achieve Then, you can call the custom target command using the constructed INCLUDE_COMPILER_STRING variable: add_custom_target(Bar ALL COMMAND ${CMAKE_C_COMPILER} thing. ; If it’s easier to get a list of all Note that in the real world, you would never want to both set the CMAKE_CXX_FLAGS and set the target_compile_options at the same time. However, for adding preprocessor definitions and include directories it is recommended to use the more specific commands target_compile_definitions() and target_include_directories(). cpp) SET_TARGET_PROPERTIES(myfile. And with CMake's CMAKE_BUILD_TYPE you can switch between Debug and Release compilations without changing the toolchain-file. c) add_executable(contactbook src/main. Tsyvarev Tsyvarev. This will create a mypkg::library1 target in the output of the CMakeDeps generator. While setting cached version of this variable in the project could be inconvinient for the user (but useful in some cases), there is nothing wrong in appending flags to non-cached variable. See Also. set_property( TARGET foo APPEND PROPERTY COMPILE_OPTIONS -Wall ) This was fine as long as I could assume the compiler would be gcc or clang, which I was assuming. If you want to change a generator, pass appropriate -G For a C++ project, for a single library and CMakeLists. it’s working now. Ideally I could do this via an environmental variable, but if that is not possible, passing in my value as a command line argument would be ok too. While it is only meant for add -D flags, it also works with any other compiler flag. Leave variables like those for the user to manipulate. Along with that some of the important variables are CMAKE_FIND_ROOT_PATH_MODE_LIBRARY and CMAKE_FIND_ROOT_PATH_MODE_INCLUDE. But if you just need some additional C++ compiler options in your project, taking add_compile_options(), target_compile_options() or target_compile_features() is the way to go. 3 , CMAKE_CXX_FLAGS defined in toolchain was NOT propagated in child projects the first time I am creating the build directory. Can’t say for sure, but what I would try: Check whether flags set via add_compile_options are applied to your targets added via ExternalProject_Add as well; if not → GOOD!; Otherwise, do you have a list of all your “internal” targets? then you could loop over them and use target_compile_options to add the warning flags. For file-specific settings, there is the source file property COMPILE_OPTIONS. And yes, you can differentiate between DEBUG and RELEASE there. This CMake command allows you to set compiler flags specifically for a particular target (e. target_compile_definitions For CMake 3. I need a separate build directory for each compiler - This is unavoidable EDIT Based on answer feedback: If the compile definitions DEF_A and DEF_B are mutually exclusive in the lib target. For defer actions until the build stage (when make is run) you could use the command ExternalProject_Add. ADD_EXECUTABLE( foo foo. building 32bit and 64bit binaries from the same compiler toolchain. CMake only supports using a single toolchain throughout the build. The final set of options used for a target is constructed by accumulating options from the current Spot On! add_dependencies allowed me to create the final dependency 'link' between add_custom_target created targets, and add_custom_target generates the targets needed to get add_custom_command to create real content in the makefile, i. txt is). target_include_directories, specifying which directories will contain header (for C/C++) and module CMake lets you set properties at many different 1) No, COMPILE_OPTIONS is a target property. c gsf_enc. target_compile_features(target PUBLIC c_std_99) @aldo the problem with add_compile_options() is that the warnings will propagate to targets added via add_subdirectory(). – Yun Wen. The preprocessor definitions are added to the COMPILE_DEFINITIONS directory property for the current CMakeLists file. The /MP option causes the compiler to create one or more copies of itself, each in a separate process. What is the correct portable way to do this, using target_compile_options? In my CMakeLists. An external application is tasked with building, and currently does so by calling cmake --build . txt file, I would like to set compiler options differently for sets of files. tlb file), how can I set the flags for this target different?. How would I use I want to add gcc compiler option -Og for Debug builds only. . Follow answered Jan 22, 2020 at 14:55. In short: CMake currently does not support to use the clang/clang++ command line interface if you install Clang from llvm. 7 or newer, since we need to iterate through all existing targets using the BUILDSYSTEM_TARGETS property, which was added in 3. If you are unable to use 3. Define these macros For directory-wide settings, there is the command add_compile_options(). cpp_info with a self. The most straightforward solution should be using add_compile_options() if you are using version 2. I use target_compile_options to configure some settings like warnings for these executables. 1. # For target set_target_properties(your_project_name PROPERTIES COMPILE_FLAGS "") # For files set_source_files_properties( ${list_of_your_files} PROPERTIES COMPILE_FLAGS "" ) It is also possible to set the options per-folder basis by separating your project as subproject, add it using add_subdirectory(your_project) and in your Yes, you can append compiler and linker options. g. From CMake's documentation and looking around, I need a 2 pass build - first host to create the I recently upgrade my gcc to a version whose default dialect is C++17. target_compile_definitions(foobar PRIVATE $<$<CONFIG:Debug>: I'm currently working on using cmake to build some projects, with the main platforms being Visual C++, MinGW GCC and Linux GCC. Alias Targets do not support setting target properties. This command can be used to add any options. It does not mean “pass -std=c++17”. 3 and v3. You have to remove the build files compleatly and reconfigure cmake when making modifications to the toolchain file. 12 (2013) Two new commands to set CMAKE_CXX_FLAGS:. LINK_FLAGS_<CONFIG> will add to the configuration <CONFIG>, for example, DEBUG, RELEASE, MINSIZEREL, RELWITHDEBINFO. c PROPERTIES -x objective-c. If you want to change a compiler, set CMAKE_C_COMPILER in the CMakeLists. Examples. In essencetarget_compile_options () gives you the power to tailor the compilation process for each part of your project, optimizing for performance, enabling debugging features, or target_compile_features should do it. How to set compile features in cmake toolchain file for known custom compiler to use target_compile_features 2 How do I get CMake Tools to compile programs in Visual Studio Code with C++11 (or higher) features? Arguments to target_compile_options may use "generator expressions" with the syntax $<>. After compiling 'utils', the command 'make install' has not been done. I added a add_custom_command(TARGET and that worked fine. I’ll look into this. CMAKE_C_COMPILER. The final set of options used for a target is constructed by accumulating options from the current Then, I add them to the target: target_compile_options(${lib_name} PRIVATE ${flags}) But when I run "make" the compile options with spaces get quotes added to them:-auto -qopenmp "-convert big_endian" And then the compiler doesn't recognize it as a flag. 12, CMake used command add_definitions which affects all targets in the current directory and subdirectories, even if you don’t want to. I want to compile ‘C’ source file, defining HAVE_CONFIG_H to the C preprocessor. I've tried to do: SET( CMAKE_CXX_COMPILER "C:/MinGW/bin/g++" ) without success. , an executable Target Properties Provides a more structured approach for managing target properties. include_directories(${YOUR_DIRECTORY}) However, with the target_compile_options method of specifying options, this no longer works. My question was answered through the reply to my bug report, but I add the answer here to have all information in one place for future reference. c gsf_compress. txt I am building a library: # Static library add_library(gsf STATIC dump_gsf. – Tsyvarev Commented Dec 1, 2017 at 7:57 A target is the basic element in the CMake DSL. You can also use add_dependencies() to specify dependencies manually. 12, CMake introduced a new command add_compile_definitions which is more specific to targets For a given target, CMake will collect all flags from CMAKE_CXX_FLAGS, the target's and directory's COMPILE_DEFINITIONS and from all add_compile_options which affect the target. add_compile_options(-fno-rtti) I have a CMake project that supports multiple processor compilation in Visual Studio through the \MP flag. Use include_directories() to add Run cmake: cmake -G "NMake Makefiles" \path_to_source\ nmake; One way to get cmake to build x64 on Windows with Visual Studio is like so: Start Visual Studio Command prompt for x64; Run cmake: cmake -G "NMake Makefiles" \path_to_source\ nmake; Using Cmake, how do I compile either or both architectures? (like how Visual Studio does it from in I'm working on a C project whose CMakeLists. All flags are determined on *configuration stage Also I try to set CMAKE_CXX_KNOWN_FEATURES. Adds options to the COMPILE_OPTIONS directory property. Each target has properties, which can be read with get_target_property and modified with set_target_properties. I created a target and set things like ABI flags (-mcpu, -mfpu etc. thank you, execute process works every time. I think you're mixing up two different paradigms here. Usually, I run my program on a Linux based system with $ mpicxx -fopenmp -Wall -std=c+ Is there a way to configure CMake such that a single make command will launch both host and target builds? I have a project that is meant to be run on a target platform but requires some generated data from a generator that needs to run on the host platform (PC). 10 or older) without support for target_include_directories, you can also use the legacy include_directories instead:. SET_TARGET_PROPERTIES(myfile. add_definitions is meant to add preprocessor definitions. Also, the "source" directory according to CMake doesn't necessarily have anything to do with the directory of your source files. , no flags are present apart from cmake default flags (eg. set_target_properties() is best suited for single-value properties, because it interprets its arguments as key1 value1 key2 value2Your command as written would set property CXX_CLANG_TIDY to value clang-tidy and then property named --checks=-*,modernize-* to value --verbose. If you want to use Arguments to target_compile_options may use "generator expressions" with the syntax $<>. cmake -G"Visual Studio 14 2015" I've come across at least 3 ways to do this and I'm wondering which is the idiomatic way. This variable may only be set in a toolchain file specified by the CMAKE_TOOLCHAIN_FILE I have a number of legacy Makefiles I am using through add_custom_command to produce libraries and executables as we slowly port to CMake. Basically, if you have a CMakeLists. One issue I’m having is dealing with the CXX and CUDA target compile flags propagated through depenendent interface libraries that have been ported to CMake. You were so close! Your code works as soon as you replace spaces with semicolons: You are right, I was wrong, the problem is here with cmake 3. You should stick with one approach (in my experience target_compile_options is less A (maybe) pedantic comment: to make MSVC behave as a conforming compiler, you also have to use the /Zc:__cplusplus flag because otherwise the __cplusplus macro is not set to the right value. Yet, for some specific use cases I’d like to use older standard but with target_compile_options(${TARGET_NAME} PUBLIC $<$<COMPILE_LANGUAGE:CXX>:cxx_std_14) I’ve got -std=c++17 appended to the The reason for doing things this way is because (ideally) nothing should be in the CMakeLists. 1 cmake lets users set the intended compiler standard through target properties by setting the CXX_STANDARD property to 11. cmake -G"Visual Studio 14 2015 Win64" -H%SOURCE_ROOT_DIR% -BC:\build\vs2015\x64\MyProject If you like to build for x86 on Windows with VS2015 - you would go this way:. However, I now have the issue that these flags are passed to the assembler call as well. 3). Some compiler drivers are inherently cross-compilers, such as clang and QNX qcc. By searching on howto pass flags to nvcc in Cmake, I came across a solution . If you want to use two compilers, you need to run CMake twice. Neither Cygwin nor MinGW seem I believe setting the flags per-target is better: add_executable(solver solver. 0 -- Check for working C compiler: /usr/bin/cc -- Check for working C compiler: /usr/bin/cc -- works -- Detecting C compiler ABI info -- Detecting C compiler ABI info - done -- Detecting C compile features -- Detecting C compile features - done -- Current compiler flags CMAKE_C_FLAGS are: -- Current Sets properties on targets. See also CMake FAQ: How can I get or set environment variables? environment variables SET in the CMakeLists. (Further created targets initialize their property with the directory's one, but previously created targets are unaffected by this directory property). Note that you also have respective set_*_properties functions for some of the other types of properties: set_source_files_properties, set_directory_properties and set_tests_properties. You set environment variable at configuration step, but command specified for add_custom_target is executed at build step. Notably absent are setters for install and global properties. I've successfully used CMake to built a shared library, but the size is not so good. For example, I might want to enable warning -Wunused-parameter for some files but not others. txt file. I updated the versions of GCC and CMake. The reason for that is that these functions predate the general set_property call, which was only introduced When calling the cmake command you can define a generator for instance Visual Studio 14 2015 Win64 which results in the target platform x64. txt?. In CMake you cannot set compiler flags depending on what is being built. c <snip> ) I want to specify different compile options for the . If you want to use the clang/clang++ interface (which is necessary to cross-compile for ARM) you Those are globally cached variables you are trying overwrite in your first approach. You can also do set (CMAKE_CXX_STANDARD 14) at the top-level (assuming your project is a “leaf”; if you have Specifies compile definitions to use when compiling a given <target>. txt only take effect for cmake itself (configure-time), so you cannot use this method to set an environment variable You’re on the right track, but need a slightly different syntax. CMake target to just compile a source file. However, when I do. Option De-duplication¶. txt files or dependencies. 11 you can use target_compile_definitions. I'm struggling with the following problem: I want to add some compiler flags to a target depending upon whether another specific target is being built. What is the recommended pattern for doing so? Should I do something like this in CMakeLists. c) add_library(contact-shared SHARED EXCLUDE_FROM_ALL lib/contact. I am attempting to compile for Andr To suppress compiler warnings that originate from libraries I use in my application, I manually include their directories with target_include_directories(myapp SYSTEM ) as system libraries before adding them with target_link_libraries like so:. I just tried this out on a target to be sure and the COMPILE_FLAGS property isn't event set if properties like INCLUDE_DIRECTORIES and COMPILE_DEFINITIONS are set. cpp-file in two different targets (becoming two VS projects after running CMake). txt instead. i. These are independent things. If you want to open source your project, and have others consume your CMakeLists via ExternalProject, then doing so would be considered bad practice, as you're foisting your build As this question keeps getting attention I'm summarizing here what I think are the best options today. so using WSL. Improve this answer. Thank you both for your comments. target_compile_definitions sets the value for WHOLE executable/library, where as 'set_source_files_properties` sets the value for only the specified file. While my clang-tool can accept a “compile_commands. 2. Given a CMakeList. Because of this the target property didn't Command add_compile_options affects only on the targets, which are created after the command is invoked. This answer is based and new functions from CMake v2. c files. There seem to be several ways of doing some things in CMake and it When you have mixed C and C++ sources, the LINKER_LANGUAGE property might apply the wrong flags for compilation of individual sources. ) with target_compile_options() and defines which target_compile_definitions(). The add_compile_options() command does take generator expressions: Arguments¶. Here is how I set it: add_library(project_options INTERFACE) target_compile_features(pr I need to replace the /std:c++14 flag of an INTERFACE target (header-only library) with /std:c++17. See add_target_definitions But right now only -Wconversion was setted using add_compile_options(). The named <target> must have been created by a command such as add_executable() or add_library() and must not be You can use the target_compile_options () function to set compiler flags for a specific target. These flags influence how the compiler behaves when compiling the source files that belong to that target. 2 too. And target does not have any own additional flags. CMake has to know the consumers of your targets, and how (if at all) your targets' properties/configuration propagate to the targets' consumers. See the cmake-generator-expressions(7) manual for available expressions. I have some subdirectories that compile some libraries to link with the executable. Before version 3. I am able to compile the library as *. Current command documentation says:. c++ ${CMAKE_CXX_FLAGS} ${FLAGS_FROM_TARGET_COMPILE_OPTIONS} file. cpp PROPERTIES COMPILE_FLAGS "flags1") ADD_EXECUTABLE(project1 myfile. dll for Windows, and also an *. As mentioned, you can as of CMake 3. You most probably forgot to clear your build tree. After the update CMake no longer sets the right command line option for the c++ standard. vdlkr ysfkrq rron ukom ewfcqy ulppoqv zqtwe bzdcs hpe xddql ojlke gdeh wdjv znvynb jyzn