Cmake preprocessor define command line. CMake is dropping a preprocessor definition.

Cmake preprocessor define command line , an executable, a library). -dN ¶. How can Note that the parameters to a macro and values such as ARGN are not variables in the usual CMake sense. I have a (Windows visual studio) resource dll (containing just rc files) that I want to build with two different configurations with different preprocessor flags. Something like that if can only work with single-configuration generators (e. json with npm's command line tool for json: cmake -DCMAKE_EXPORT_COMPILE_COMMANDS=ON # json < compile_commands. For multi-config generators such as If you just want to know at run time if the running executable is a unit test configuration, pass a dedicated preprocessor definition to your unit test executable: target_compile_definitions(ProjectFoo_UnitTests IS_UNIT_TEST) And check this definition in you C++ code: #if defined (IS_UNIT_TEST) # include "some_mock. The COMPILE_DEFINITIONS property may be set to a semicolon-separated list of preprocessor definitions using the syntax VAR or VAR=value. They are also added to the COMPILE_DEFINITIONS target property for each target in the current CMakeLists file. I have not been able to figure out how to set the flags differently for the two different configurations. The link command line is set in Modules/CMake{C,CXX,Fortran}Information. · Let's first start with the simplest - how to define and test a preprocessor variable. 6. h files with some parts of the code disabled by putting the code block in pre-processor directives e. rc st3500. I would like to be able to just define a cmake variable without giving it a value, similar to how the C preprocessor can define variables and check if the variable is defined. cmake -B intermediate/cmake -G "Visual Studio 16 2019" -T v142 -DCMAKE_GENERATOR_PLATFORM=x64 In my CMakeLists. Open Sorry if it has been asked many times, but I still cannot make my way. Function-style definitions are not supported. I would like to script the generation passing different preprocessor options (like /DFOO1 /DFOO2 ). Preprocessor directives are a semicolon-separated list of items in your project properties, under configuration - C++ - preprocessor. It seems that I have to use -D variable_n&hellip; Calling cmake -DVARIABLE sets a CMake variable, it will not automatically add the compile definition to every (or any) target. External library specific COMPILE_DEFINITIONS in cmake. txt add_definitions("-DVAR=${VAR}") and run the command like so: cmake -DVAR=ON and in my c++ code I have this: #if VAR //do this #else //do this # When add_definitions() is used, CMake adds the specified preprocessor definitions to the compiler's command line. Preprocessor definitions for compiling a source file. This property specifies the list of options given so far to the add_compile_definitions() (or add_definitions()) command. sh that stores the command line arguments; call the real cmake executable with the command line arguments ~/bin/cmake # code is shown below #!/usr/bin/env bash # # Place this file into this location: ~/bin/cmake # Another way is to have cmake run cppcheck itself. Disclaimer, . Ferenc Deak Ferenc Deak. create . 3135. And other approaches should be used instead. It Not sure what kind of more "idiomatic way" you expect. #ifdef DEBUG //some logging here #endif The question is: what compiler definition is available on all platforms in the CMake "Debug" build type? DEBUG seems not to exist. In this case warning about tr1 seems to arise from incorrect project configuration. Take a look at add_definitions, which will add your definitions to your compiler command line, e. Peter Mortensen asio "warning" either the preprocessor definition or the command line flag gets the job done. Just a note, I compile the entire project from command line, using cmake (no cmake gui). 0 CMake is dropping a preprocessor definition. This can be changed by replacing the rule that builds the link command line, which lives in variables CMAKE_CXX_LINK_EXECUTABLE (and friends). Like add_definitions(-DNUMBER=NUMBERX) and from command And you can use this command line cmake -S <src_folder> -B <build_folder> -DCMAKE_BUILD_TYPE=Debug. Ferenc Deak. target_compile_definitions (< target > <definitions>) <definitions> A list of preprocessor definitions. asked Aug 11, 2014 at 12:29. But I have a problem. txt they appear: //No help, variable specified on the command line. Therefore, lets say you are defining the following The general trend in modern CMake is to move from global settings to target-centric settings. To use these options you can import a GUI project file. -dD ¶. Macro names must not contain any special If you want a debuggable build, just do a debug configure at the command line. Follow CMake conditional preprocessor define on code. Follow Adds definitions to the compiler command line for targets in the current directory and below (whether added before or after this command is invoked). x each), Clang (3. C++ Macro defined from outside . Function-style The ESP-IDF build system adds the following C preprocessor definitions on the command line: ESP_PLATFORM: Can be used to detect that build happens within ESP-IDF. I am also not sure how to add the Preprocessor Definition. 35. cpp or . Viewed 11k times in your command line. Function-style definitions are not supported. CMake is dropping a preprocessor definition: ( Consider defining the macro in a (configured) header file. "While compiling libB, it is expected that public compile definition of libA are automatically taken care by cmake to be available in libB. Flags beginning in -D or /D that look like preprocessor definitions are automatically added to the COMPILE_DEFINITIONS directory property for the current Add preprocessor definitions to the compilation of source files. In our current configuration we have a hardcoded preprocessor definition: USE_NEW_AUDIO_ENGINE. -dI This is to complete the answer by arrowd. what is the recommended way to stay in control of those? Thanks, Serge How to make multi line preprocessor macro? I know how to make one line: #define sqr(X) (X*X) but I need something like this: #define someMacro(X) class X : public otherClass { int foo; void doFoo(); }; How can I get this to work? This is only an example, the real macro may be very long. Benefit of your approach is that you don't need the link step (which costs I would love to define it to a value, so that I might use a preprocessor #if SOMEVALUE == 4 might work, but I cannot seem to find a way to pass a Preprocessor definition + value to MSBuild via the command line. Is there a way to pass a preprocessor definition directly through to the resource compiler or a way to define a value for a Have you tried adding the explicit "undefine" to the command line: -U_WINDLL? – Adrian Mole. In First you can add DEFINES += SOME_DEFINE=value into your . To pass a C++ or C pre-processor define without modifying any CMake source files, use the environment variables CFLAGS for C or CXXFLAGS for C++ respectively, e. CMake set variable. (avr-)gcc 4. Passing command line variables to CMake. Then you can create a header How to pass a variable from command line to a CMake Toolhain file? Ask Question Asked 6 years, 4 months ago. How to make multi line preprocessor macro? I know how to make one line: #define sqr(X) (X*X) but I need something like this: #define someMacro(X) class X : public otherClass { int foo; void doFoo(); }; How can I get this to work? This is only an example, the real macro may be very long. C++ preprocessor variable. h header. In my CMake configuration file, I was trying to declare a preprocessor definition containing a date format string. For example: 1>- add -D_WIN32_WINNT=0x0501 to the compiler command line; or 1>- add _WIN32_WINNT=0x0501 to your project's Preprocessor Definitions. x, it turns out that when you call add_definitions() in CMake, it adds the definitions to the COMPILE_DEFINITIONS directory property. And that is one way to pass values from CMake into C or C++ source code: The result of configure_file() is a C/C++ header file, which is included by the code you want to respect the CMake variable values. This can be done by setting CMAKE_CXX_CPPCHECK (see the documentation). The order of <src-dir> Note that some preprocessor defines are dependent on command line options - you can test these by adding the relevant options to the above command line. This does have some disadvantages (for example, each source file is @MitchLindgren CMake Toolchains are special because they're processed before anything else. Modified 6 years, 4 months ago. In cmake how do you do a conditional preprocessor #ifdef #endif. (Only CMake target can carry This CMake command allows you to define preprocessor macros (also known as compile-time definitions) specifically for a particular target (e. More information: add_definitions , cmake options Is there a way to create list variables in CMakePresets. Manually add $(Variable) to the list, then when you call MSBuild from the command line you can set /p:Variable=FOO and things like #ifdef FOO will respond to it. 1 Enable macro depending on cmake target. 2 posts a warning that the variable was not used while cmake Based on the value of TOPPINGS, my CmakeLists. 3 vs. If the settings. sql COMMAND add_compile_definitions (<definition> ) Adds preprocessor definitions to the compiler command line. I also tried the COMPILE_DEFINITIONS option as mentioned above by arrowd unsuccessfully. cmake / ninja adds a compile definition: -DNDEBUG automatically and it breaks the build. If used, it must be a verbatim repeat of the argument of the opening macro command. As it can be seen, it allows to define custom user CMake configurations besides the standard Release, Debug, etc ones. Follow edited Oct 5, 2022 at 12:22. Latter command allows for files to compiled using a different language; i. You can have whitespace between the /D and the symbol. cppcheck. h" HAVE_SRTSEP NO_STRSEP=1). . Preprocessor definitions for compiling a directory's sources. e. See the Macro vs Function section below for differences between CMake macros and functions. Why not giving users the ability to enable it optionally while invoking CMake? You can do it by adding the option() command anywhere in the CMakeLists. It also allows control of whether the settings are used in the target only (PRIVATE), in other targets consuming this target (INTERFACE), or both (PUBLIC). How can i do that I have never done it before CMake is dropping a preprocessor definition. In CMake, the target_sources() command is a powerful tool for managing source files associated with a specific target (e. It seems that I have to use -D variable_n Specifies compile definitions to use when compiling a given <target>. , I can either say make rsutest for unit tests and build a test executable or say make rsu to get a normal executable. /* #undef FOO */ - otherwise. Load project configuration from sdkconfig file and generate an sdkconfig. To set the property on the target, use the command set target properties. Generate preprocessor definitions based on I'm coding in C using CMake and I would like to define sobre preprocessor macros in a separate file. 2 'Overwrite' cmake command using a macro and restore its default behavior. json -ga "command" | sed 's/. The difference is that /D strips quotation marks on the command line, and a #define directive keeps them. x86_64 #1 SMP Tue Sep 22 22:00:00 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux" Consider defining the macro in a (configured) The answer is to use a response file to set extra command line options for the compiler: step 1: create the response file template, in COMPILE_DEFINITIONS¶. Arguments Adds preprocessor definitions to the compiler command line for targets in the current directory and below (whether added before or after this command is invoked). If I am building my test target I want to add a define to the test code with add_definitions(-DRSU_TEST) command so that some of the lines in the actual code can be ignored . If you use -dM without the -E option, -dM is interpreted as a synonym for -fdump-rtl-mach. No reason to modify the cmake file itself. : set_source_files_properties(compile_me_as_objc. To set the environment variable PATH, do:. The purpose of this is to have a main configuration file for my apps. For example: add_custom_command( OUTPUT myfile. The resulting build will have the debug flags on for the given build system. cmake. Based on this rule alone, target_compile_definitions() is the most modern approach. target_compile_definitions sets the value for WHOLE executable/library, where as 'set_source_files_properties` sets the value for only the specified file. How do I define a preprocessor variable through CMake? The equivalent code would be #define foo. UPDATE (1/29/2021) One way to store CMake command line arguments, is to have a wrapper script called ~/bin/cmake (***1) , which does 2 things:. yml file is customized to add new configurations to the settings. CMake command line define macro without value. 2 (and several others) using the same makefile and main. Update Yep, I did not understand the OP's question. Here is the code I have set(rc_files dg3500. What is the method to get rid of this default specifically and any in general? This happens also for compile options and linker options. cmake; Share. use it with the COMPILE DEFINITIONS property on the target and i think you are done. You could pass it on if you want: I found some links -> How to define a C++ preprocessor macro through the command line with CMake?. 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. What would be the best Both options cost one line of overhead per option, though the first approach is a little noisy and the second approach costs a file. cmake to place the intermediate files to a certain If the command line parameter is not provided and this setting is not specified, an environment-specific cache variable will be evaluated to decide, if package restoration should be performed. 10. If you use CMake however, you’re not writing the compilation command yourself. Asking for help, clarification, or responding to other answers. txt I want to use my own version of CMake command add_subdirectory(), How can I define a C++ preprocessor macro through the command line with CMake? 56. cpp. Each definition can be: A single macro: -DFOO; A macro with a If you are invoking the preprocessor from a shell or shell-like program you may need to use the shell’s quoting syntax to protect characters such as spaces that have a meaning in the shell syntax. These define configuration variables/macros that are accessible from the build scripts and C/C++ Adds preprocessor definitions to the compiler command line. in to generate the file from a CMake string. Command line, definitions are ignored by cmake, if I do it like this: cmake -D_UNICODE="" -U_MBCS="" Command line, definitions are ignored by cmake, if I do it like this: cmake -DCMAKE_CXX_FLAGS_INIT="-D_UNICODE -U_MBCS" I assumed that both ways are the same, but obviously the handling of the definitions from command line is different. Here is my solution for GNU CPP: /* Some test definition here */ #define DEFINED_BUT_NO_VALUE #define DEFINED_INT 3 #define DEFINED_STR "ABC" /* definition to expand macro then apply to pragma message */ #define VALUE_TO_STRING(x) #x #define VALUE(x) I would like to be able to just define a cmake variable without giving it a value, similar to how the C preprocessor can define variables and check if the variable is defined. Here we have xc32-gcc 4. You can import and use Cppcheck GUI project files in the command line tool: cppcheck --project=foobar. For example there is a # How can I define a C++ preprocessor macro through the command line with CMake? Related. CMake will automatically escape the value correctly for the native build system (note that I want to generate a Visual Studio project with two configurations using cmake. Commented Aug 29, 2018 at 7:50. cpp instead of definig its own main then we have to add #define CATCH_CONFIG_RUNNER in main. I want to have a precompiler symbol with the compiler arguments or command line. The build worked on macOS using apple-clang/Xcode but it failed on Windows using MSVC/Visual Studio. If you wish to define a function-like macro on the command line, write its argument list with surrounding parentheses before the equals sign (if any). cpp If you are invoking the preprocessor from a shell or shell-like program you may need to use the shell's quoting syntax to protect characters such as spaces that have a meaning in the shell syntax. It is not called until the package is build, because actually it could use some information that is generated at build time. Make cmake pass command line variable to compiler. It seems that I have to use -D variable_n If on setting CMAKE_C_COMPILER in the command line CMake errors that a compiler cannot "compile a simple project", then something wrong in your environment. I am trying to force the user to pass a parameter before compiling. 1 How to clear all defines from cmake? 10 Unset define in cppcheck analyze from cmake generated command. Remember that you can pass arguments to scripts through the command line after a --token. 1>Please define _WIN32_WINNT or _WIN32_WINDOWS appropriately. CMake - Project level macro add to application level target_link_libraries. Example: #ifndef DONT_DEFINE_MYDEF #define MYDEF #endif One way to get cmake to build x86 on Windows with Visual Studio is like so: Start Visual Studio Command prompt for x86; 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" Adds preprocessor definitions to the compiler command line. Like -dD, but emit only the macro names, not their expansions. cpp To get that #define for every myfile. Values will be stored in the CMAKE_ARGV<n> variable and the count of the passed arguments will be in the CMAKE_ARGC variable. And here the documentation https: Define a preprocessor macro through CMake. The command line tool usage is kept intentionally simple and the options are therefore ONLY inside the src/CMakeLists. PRIVATE and PUBLIC items will populate the Let's say you want a replacement for #define MYDEF. rc mn3500. How to get CMake variable of package in shellscript. For this reason, SET(CMAKE_GENERATOR_PLATFORM x64) (or in your case, x86) should do the trick in a Toolchain file. 8. Follow Alternatively, you might use SET_PROPERTY(DIRECTORY APPEND PROPERTY COMPILE_DEFINITIONS GEN_OUTFILES) SET(CMAKE_C_FLAGS_RELEASENOOUTFILES -UGEN_OUTFILES) and rely on the assumption that (1) the FLAGS are mentioned after the COMPILE_DEFINITIONS, and (2) the last -D/-U argument in the command line will take effect. set(ENV{PATH} "/home/martink") To set normal variable, do: Adds preprocessor definitions to the compiler command line. Provide details and share your research! But avoid . Define a pre VCBUILD does have the /override command line switch, but I am not sure it can be used to modify #define symbols that can then be tested using #if conditional compilation. txt, etc. 7. The syntax is the following: option(<variable> "<help_text>" [value]) option command might provide what you are looking for. pro file. NB I have two targets for my CMake file. I generate the project with the following command. add_compile_definitions(<definition> ) Adds preprocessor definitions to the compiler command line. – Tsyvarev. Each entry emulates a #define public <macro> directive. Like -dM except that it outputs both the ‘#define’ directives and the result of preprocessing. The preprocessor definitions are added to the COMPILE_DEFINITIONS directory property for the current CMakeLists file. "cmake -DCMAKE_BUILD_TYPE=Debug". How can I define a C++ preprocessor macro through the command line with CMake? 56 CMake: How to pass preprocessor macros. I want to use cmake on my project but I have to define a preprocessor macro this way : #if defined CONFIG_TEXTUI void BoardView_init (void) { } void BoardView_free (void) { } void BoardView_displayAll (void) { } void BoardView_displaySquare (Coordinate x, Coordinate y, PieceType kindOfPiece) { BoardView_displayAll(); } void BoardView_displayEndOfGame (1) @JohnStrood The difference is at scope level. The -D parameter is simply setting this value on command line instead of from within the MyToolChain. One another option: Use the default defined macro local to the project. Is there a way to do this with some My cmake-based legacy C++ code base contains some specific preprocessor debug macro - let his name be DEBUG_ATTRIBUTE - responsible for certain types of debug output. This command can be used to add any flags, but it is intended to add preprocessor definitions (see the add_compile_options() command to add other flags). Was it simply because -D is used by compiler frontends to pass preprocessor definitions, and that sort of maps to variables in CMake, which are close enough in meaning? Or was it an arbitrary decision? #define FOO - if the CMake variable FOO is set to ON or TRUE. Note that -x How can I define a C++ preprocessor macro through the command line with CMake? 56. The Cppcheck GUI has a few options that are not available in the command line directly. Prefer Is there a reliable way to add a C++ preprocessor definition on CMake's command line? If there is no cross-platform solution, is there at least a one on Windows? Specifically, we would like to def A good alternative would be to define a CMake option: OPTION(DEFINE_MACRO "Option description" ON) # Enabled by default Followed by a condition: IF(DEFINE_MACRO) ADD_DEFINITIONS(-DMACRO) ENDIF(DEFINE_MACRO) Then you can turn that option ON/OFF via the command line with CMake using the -D flag. Syntax. 17. Definitions are specified using the syntax VAR or VAR=value. Function-style Macros are defined using the `define` command, and they can be used to: Create targets; Set properties; Add dependencies; Call other macros; Macros can be very helpful for writing more concise and maintainable CMake scripts. 4. Note, however: This is undocumented feature. How to You cannot change COMPILE_DEFINITIONS property from command line, you need to modify the code. I don't know about later versions. Follow edited Sep 9, 2018 at 22:13. cpp just use -D like so: g++ -DMYDEF -o myfile. Despite his name, the macro shouldn't be turned on for a standard debug build. COMPILE_DEFINITIONS¶. CMake: How to pass preprocessor macros. Target-specific You can use add_definitions() at the project level (affecting all targets) or within a specific target_link_libraries() or add_executable() block to define macros for a particular target. You need to decide what tool your are going to use before asking the question as you are giving a Make command and then asking about CMake. g. Moreover, everything which follows the variable in the template file will prepend the 0/1: #cmakedefine01 STDLIB_HAS_GETOPT @HAVE_GETOPT@ will produce (literally!) #define Adds definitions to the compiler command line for sources in the current directory and below. cpp so here's my main. This is the CMake command which caused the problem: You should wrap the MYDEF definition in a preprocessor macro, the presence of which (defined on the command line) would then prevent MYDEF from being defined. by CMake itself, because it normally does not force Cache entries itself and therefore you can pre-define it with another value. How to define a CMake macro in terms of another I'm answering the question to myself by copying essential parts of solution received from Petr Kmoch as response to my post in the mailing list. ii -E/' | sh - Define a preprocessor macro through CMake. Modified 11 months ago. Function-style Then when you issue the make command, provide a "CFLAGS2=xxx" command line argument, which overrides the default setting in the makefile. exe. Example: cmake FYI: Apparently even different versions of the same toolchain on the same system can act differently in this regard (As in, it would seem this would be a shell-passing issue, but apparently it's not limited to merely the shell). build. , an executable or a library). CMake is dropping a preprocessor definition: BUILD_HOST="Linux cvuppala-bri-vm 2. This only gets the git information at configure time, and can miss changes to the repository. How do I define a preprocessor variable through CMake? The equivalent code would be #define foo. (The effect is the same as with -e option for environment variables). This is useful to see whether optimization was enabled and which switches were enabled at the command line. Command-line commands. You can see the default defined macros local to the project in the below location: Properties -> C/C++ -> Preprocessor -> Preprocessor Definition. After I run cmake . I'm currently using GCC as my compiler, but If at all possible I'd like the CMake configuration to be compiler agnostic. BEWARE: it will blow away other constants defined in the project files but you wouldn't be silly enough to define constants in a Add preprocessor definitions to the compilation of source files. The Makefile generated from the CMake file simply does what the CMake tells it to do. #ifdef FOOBAR // some code that can be compiled if needed by defining FOOBAR in pre-processor. Function-style switching from Devenv to the msbuild command line the secret-sauce. I want some way where I can change the value using command-Line. They are string replacements much like the C preprocessor would do with a macro. It will generate toolchain files that Note if you define MYVARIABLE on the command line the default value is 1: g++ -DMYVARIABLE <file> Here the value of MYVARIABLE is the empty string: g++ -DMYVARIABLE= <file> When you make a preprocessor #define symbol, you should establish a convention that either you define it as 1 or 0 for use in #if, or you leave it blank. See the cmake_policy() command documentation for the behavior of policies inside macros. CMake will automatically escape the value correctly for the native build system (note that CMake language syntax may require escapes to specify some values). There they say to add add_definitions(-DNUMBER=5) in CMake and it is working I can change the value using this way. 1. " - These are good expectations of libB, assuming it links with the target libA. The solution I cam up with was to write a simple utility to create a header file that #defined the symbol based on the state of an environment variable and run the utility from a pre-build step. To work around the compile-time macro output limitations you might actually generate a full working program with std::cout << FOO_MAJOR_VERSION << std::endl; in main(), run the program and capture stdout. --system SYSTEM Define system for cross Hello guys, I am using cmake generator ninja to build my project. First, --cmake-prefix-path CMAKE_PREFIX_PATH List of additional prefixes for cmake to search (default: []). Select the Configuration Properties > C/C++ > Preprocessor property page. (just for host machine) --build. 28. no. txt I define configurations: The package_info() method is the information provided to the consumers of the package. Inside that function you could call check_symbol_exists and The cmake command line -D option does: "Create or update a CMake CACHE entry". CMake parses off the /define and adds the actual define to the DefineConstants section of the csproj, if there are quotes it will put the entire Per legacy, the endmacro() command admits an optional <name> argument. When using the Visual Studio generator, package references are defined using the VS_PACKAGE_REFERENCES property. x) and MSVC++ (>= V8). They 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. The following is my c++ code: #ifdef hehe_test #define it_exists "it_exists" #endif #ifndef hehe_test #define it_exists "it_doesnt_exist" #endif int main(int argc, char** argv) { printf("%s\n",it_exists); return 0; } @Xmanoux As I understand, -D in CMake options just adds a local variable to cmake script, whereas add_definitions adds definitions (-D) to the compiler command line. Though this is a bit of a wish for now. Invocation¶ add_compile_definitions New in version 3. 5 'undefined reference to' with cmake. In this case it adds a macro VAR to be set to "something" (I think including the quotes). CMake will automatically escape the value correctly for the native build system I was wondering if anyone knew why was -D chosen as the option used to pass cache variable on the command line. For the sake of discussion we'll say it does: add_definitions( -DCHEESE=Mozz ) add_definitions( -DMEAT=Meat ) This generates without a problem. Both kinds of output go to the standard output file. cmake-prefix-path BUILD. It's much more powerful, and you can define constants using /property:DefineConstants=XERCES_STATIC_LIBRARY. BOOST_PP_STRINGIZE seems a excellent solution for C++, but not for regular C. I have a number of . So, how can we achieve the same effect? First, we will use CMake’s option() function to add a command-line option when running the cmake command: option(USE_DEBUG "Enter debug mode" OFF) I have a CMake project that I want to be able to compile using g++, MinGW/g++ (4. have to be let alone. See documentation of the directory and target COMPILE_DEFINITIONS properties. – Atif. cmake and defaults to using the compiler, not CMAKE_LINKER (see source code). el6. 2. Some of the existing solutions: Use execute_process. Define a preprocessor macro through CMake. This kind of scenario where you want to create a macro definition with the same name as a CMake variable where the CMake variable might be a CMake-falsy value is the weakness scenario of #cmakedefine that one can avoid by instead using #define and configure_file's variable substitution facilities- namely @VAR@ and ${VAR}. It is a bit convoluted to be sure, but you can then control the build in the way you want from the command line (or Makefile). hpp. In your makefile you have the compiler command line, something like (simplest example): g++ -o myfile. cmake -DVARIABLE1=value1 -DVARIABLE2=value2 Otherwise, set command in the cmake script is probably what you want, see the reference manual. 1. If you need many preprocessor macros to be defined in such way, then you could write a function which will be called like add_compile_definitions_if_symbol_is_absent(strsep "string. Share. It seems that I have to use -D variable_name= instead of just -D variable_name ? It also seems that If I only check if the variable is defined, cmake-3. Enable macro depending on cmake target. Internally, it works by modifying the CMake has known limitation in what symbols can be used for compile definitions passed to the compiler via command line. They are also added to the Concept of INTERFACE option for command target_compile_definitions (and for other target_* CMake commands) is to enforce something for all users of the library, both executables and libraries. ;rm -r build; mkdir build; cd build; cmake -DUSER_DEFINED_BOARD_VERSION:STRING="SATNOGS_COMMS_VERSION_0_2_1" . answered CMake documentation for COMPILE_DEFINITIONS states explicitly that function-like macros are not supported:. How do I check, in the cmake file of a client application A, if MYDEF is defined ? L is properly installed and imported through find_package(L) Thanks A. Its macro is accessible from anywhere (public), so it can also be used in extra script files. 32-573. txt etc. I'd like to mark some code as "debugging only", like with. There are msbuild, devenv, nmake, I'd like to have CMake detect when I am building on Windows and make the appropriate definitions or command line arguments. 56. c and . cpp: Reading through the cmake quick start, you can specify variable on a command line:. The named <target> must have been created by a command such as add_executable() or add_library() and must not be an ALIAS target. CMAKE_PREFIX_PATH List of additional prefixes for cmake to search (default: []). For some reason, also all the CMakeLists. You can either set CMAKE_CXX_CPPCHECK in your CMakeLists. add_compile_definitions(USER_DEFINITION=$(USER_DEFINITION)) That way, building the project with. gcc on Linux shows error: unrecognized command-line option ‘-q Yes boost is often thought as a C++ library, but this one is a preprocessor header that works with C as well! This library defines a set of compiler, architecture, operating system, library, and other version numbers from the information it can gather of C, C++, Objective C, and Objective C++ If we want catch to use our main. sln generating foo. I want cmake to define different preprocessor symbols for these configurations. I was just reading the book Modern CMake for C++, and on page 55, the author says exactly this:. Try something like: add_definitions( -DBOOST_FILESYSTEM_VERSION=2 ) In your case, I would definitely go with the add_definition method, but an alternative may to take a look at configure_file. Usage: ADD_DEFINITIONS(-DFOO -DBAR ) Add -D define flags to command line for environments. add_compile_definitions does: "Add preprocessor definitions to the compilation of source files". Parameter -B does not work for me as expected. Related. to define a variable for the preprocessor. Then you can add DEFINES += SOME_DEFINE=value to the qmake call that Qt Creator will issue when configuring the The CMake command line argument specifies the value of the string variable. Ask Question Asked 13 years, 10 months ago. It can also substitute CMake variable values via the @VAR@ syntax. You can use CMakeConfigurableFile. That is picked up inside creator and when building on the command line and should also show up when creating a MSVC or XCode project from the . I'm wondering how you do the reverse - how to undefine an variable for the preprocessor. It could work in current CMake version and could break in the future versions. Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. -D with gcc, or /D with MSVC. You can also send in the CMAKE_C_FLAGS value with another -D argument. Does not compile with a preprocessor value on the command-line. 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 Adds preprocessor definitions to the compiler command line. – How do I define a preprocessor variable through CMake? The equivalent code would be #define foo. That does not make sense. The INTERFACE, PUBLIC and PRIVATE keywords are required to specify the scope of the following arguments. Improve this question. You can try defining GTEST_LANG_CXX11 to make gtest use stuff from std namespace or track origins of those warnings and figure out why are they still issued. Adds preprocessor definitions to the compiler command line. How to The CMake documentation says that you do this ADD_DEFINITIONS - Add -D define flags to command line for environments. What is the difference between #include <filename> and #include "filename"? 3164. Follow edited Aug 11, 2014 at 12:34. Hot Network Questions Determine the area of From command line - make can take variable assignments as part of his command line, mingled with targets: make target FOO=bar But then all assignments to FOO variable within the makefile will be ignored unless you use the override directive in assignment. 6. They do different things. cpp, but i want to add this define preprocessor in my CMakeList rather than main. Pass target file name as Adds preprocessor definitions to the compiler command line for targets in the current directory and below (whether added before or after this command is invoked). cmake, CMakeLists. Defining preprocessor in modern CMake. I've a C++ foo. 0. 7. Function-style #cmakedefine01 doesn't give the desired results: like #cmakedefine it checks the value of the CMake variable (STDLIB_HAS_GETOPT in the second case). 12. Setting flags with CMake. Add macro with variable via Is equivalent to writing #define DEBUG 1 in main. shows all the predefined macros. Following the documentation of CMake, at least for version 3. txt adds some more preprocessor definitions using add_definitions(). o -c/. CPP -D option for preprocessing of Fortran codes. rc) function(add_3500_dll name defines) The following variable simplifies the usage of Inno Setup in CMake: This group allows to add custom define directives as command-line options to the Inno Setup Preprocessor command. txt, or you can set it on the command-line that invokes cmake. Load 7 more related How to define a C++ preprocessor variable in Makefile. Everything compiles as expected: -- Detecting CXX compile features - done -- Alternatively, I sometimes used compile_command. There are two different ways of invoking Meson. Project-wide vs. I have the following code in CMakeLists. c, the only difference being 'make CC=xc32-gcc', The question is a bit unclear: Do you wish to specify the value for a variable on the command-line? Or do you wish to extract an existing variable from some CMakeFile and have cmake print it to standard out? How to pass a variable from command line to a CMake Toolhain file? 1. c PROPERTIES -x objective-c. Add preprocessor definitions to the compilation of source files. Commented Mar 3, 2020 at 11:11. Function-style Hi, I’ve got a library L that may define some preprocessor definition MYDEF with target_compile_definitions(L PUBLIC MYDEF). For a long time, CMake only had the add_definitions command for this purpose. So it is not something that could be implemented, it is impossible by definition. In your case you may omit double quotes around the macro value but stringify it in the C/C++ code. Examples: Visual Studio generators work with cl compiler but cannot work with gcc. – Then, either use the GUI (ccmake or cmake-gui) to set the cache variable, or specify the value of the variable on the cmake command line with -D: cmake -DMY_VARIABLE:STRING=option_value2 Modify your cache variable to a boolean if, in fact, your option is boolean. Commented May 16, 2016 at Note that the contents of :variable:`CMAKE_CXX_FLAGS <CMAKE_<LANG>_FLAGS>` and its associated configuration-specific variable are automatically added to the compiler command before the contents of ``CMAKE_REQUIRED_FLAGS``. Improve this answer. so I tried the following script: I am using CMake for building my projects on Windows (Visual Studio) as well as on Linux machines(gcc). I'm trying to define a preprocessor variable via CMake, but unfortunately it does not seem to work. cmake and sdkconfig. json? For instance, a list of preprocessor macros to then be passed to target_compile_definitions? In CMake syntax, I’d do something like set(MY_DEFINES_1 MACRO_1 MACRO_2=value1 MACRO_3=value2 ) # which is equivalent to list(MY_DEFINES_2 MACRO1;MACRO_2=value1;MACRO_3=value2) # and How can I define a C++ preprocessor macro through the command line with CMake? 436. build_type, then, adding it explicitly to . The CMakeToolchain is the toolchain generator for CMake. First, create a custom command using add_custom_command (version with the OUTPUT signature) to actually do the preprocessing. CMake is dropping a preprocessor definition. CMakeToolchain . : $ export Adds preprocessor definitions to the compiler command line. or you specify a compiler incompatible for chosen generator or platform. If you want true CMake variables and/or better CMake scope control you should look at the function command. For example, to see which SSE3/SSE4 options are enabled by default: $ gcc -dM -E - < /dev/null | grep SSE[34] #define __SSE3__ 1 #define __SSSE3__ 1 and then compare this when -msse4 is specified: This behavior is made use of e. See (gcc)Developer Options. For these single-config generators you can use the value of CMAKE_BUILD_TYPE to determine the build type that is being generated (see here for info on this variable). make USER_DEFINITION="HELLO" will pass -DUSER_DEFINITION=HELLO option to the compiler. Intention to clear enforcement for at least single library's user means that the conception is used in a wrong way. Function-style WARNING: Function-style preprocessor definitions may not be passed on the compiler command line because many compilers do not support it. Add a comment | 2 Answers Sorted by: Reset to default It would be nice to have a solution that catches changes to the repository (from git describe --dirty), but only triggers recompilation if something about the git information has changed. CMake's -D flag and using cache variables in a project-1. c++; cmake; boost-asio; Share. 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 file. The -DVAR=something set's cmake variable VAR to something. 4 How to use macro in cmake? Load 7 more related questions Show fewer related questions Now search these property sheets for the wrong preprocessor settings as follows: Right click on the property sheet and select "Properties" Go for the preprocessor settings: "Common Properties" -> "C/C++" -> "Preprocessor" Remove the missplaced space The trouble is, I have no idea how to even begin with the preprocessor. #endif No I need to define FOOBAR such that its defined for every file that is compiled by gcc using make. 4k 18 18 gold badges 104 104 silver badges 172 172 bronze badges. Track dependencies in DEPENDS and OUTPUT in add_custom_command and cmake will properly compile in proper order. Define a preprocessor macro through CMake (6 answers) Closed 7 years ago. configurations is not necessary. However, the second approach also lets you add additional preprocessor code that might be better placed together in the configured file. After I run : cd . There can't be whitespace between the symbol and the equals sign, or between the equals sign and any value assigned. It sets the source path and not the build path. hpp" #endif Silencing warnings is never a good option. makefiles) where separate build trees are used for debug and release builds. /cmake_call. This First, we will use CMake’s option() function to add a command-line option when running the cmake command: Now we can set this option to ON when running CMake: cmake Define Preprocessor Macros This CMake command allows you to define preprocessor macros (also known as symbols or constants) that will be used during the This CMake command allows you to define preprocessor macros (also known as compile-time definitions) specifically for a particular target (e. This command can be used to add any flags, but it is intended to add preprocessor definitions. In the CMakeCache. lhxo lcnfzxp raho mrwxqx flnmioqd vxo jzafoo dwmtdvr forxm tmg