Cmake if multiple condition

Cmake if multiple condition. The elseif and else sections are optional. Get started with the hello world example or click on any of the links below. The Makefiles based generators will only build one configuration at a time, and the normal way to build several configurations is to use separate build trees, e. It is not safe to test CMAKE_BUILD_TYPE in an if statement in general. If you want to check whether condition. Evaluates to true_string if condition is 1. Jan 22, 2016 · 2. 2. CMake by Example. These can be found in the Auxiliary directory of the source distribution, or downloaded from May 6, 2014 · LIST(APPEND myList hello) ENDIF(MINGW) LIST(APPEND myList cool) Something similar to the example would make my CMakeLists. Thus, the two examples, produce the values "a" and "" (the empty string Jul 23, 2021 · Introduction In my previous blog post CMake Part – The Dark Arts I discussed how to configure CMake to cross-compile to target hardware such as our STM32F407 Discovery board. Oct 23, 2015 · 1 Answer. cmake file, and pass the model number to cmake as a CMake variable. Inevitably you'll need to use if() condition checks to test if some condition is met. Mar 18, 2016 · I want to optionally add some library paths in my CMakeLists file and the way to do it to is to have a variable set as: Jun 28, 2019 · I want to take advantage of Ninja's "job pools" in my custom commands; something finally directly supported in cmake 3. action. CMake executes the child process using operating system APIs directly: On POSIX Aug 20, 2019 · So you need "external" place to store the configurations for current project I have multiple applications and multiple boards, the chosen application configuration options are stored inside a makefile. Multiple arguments will be joined as a semicolon May 21, 2012 · This approach sets /MP option thereby allows multiple compiler processes under each MSBuild instance. I get linker errors such as "incompatible target" durring the build. However, it is strongly recommended to stay with the case chosen in the macro definition. if (CONDITION1 OR CONDITION2) edited Oct 23, 2015 at 10:01. It may be used to configure projects in scripts. 0. for example: IF CONFIGURATION MATCHES Debug. Whether to use add_custom_command or add_custom_target depends on the actual actions in 2. -D sets variables as cache variables (see also Mastering CMake chapter, and variables docs ), which means that even though they aren't set in the configuration files, they will be remembered. The conditions may be based on the build configuration, target properties, platform information or any other queryable information. DONOT forget to add VERBATIM within add_custom_command !! Evaluates the given expression. Project source trees may also provide their own modules and specify The target is the name of a CMake target (executable, library, or custom) to which you want to add the custom command. Mar 1, 2021 · The first step to understanding generator expressions is to get a solid grasp on the CMake build process. 1. The main idea is to use the OUTPUT form of the add_custom_command on the first step with OUTPUT being equal to FOO2. Note that the expression in the else and endif clause is optional. See the cmake-modules(7) manual page for documentation of modules included with the CMake distribution. If you set the type to PATH or FILEPATH, the value will be converted to an absolute path. Use STREQUAL to compare equality of strings (including non-numeric-"valued" strings). 6 days ago · The official CMake language references is available in the cmake-language manpage and cmake-language online documentation. In both cases, it's a syntax error. out and then specify FOO2. A child process command line. For this question, you should use add_compile_definitions in the same way you were using add_definitions: add_compile_definitions( MY_VAR ) (note that the -D is not needed anymore). The documentation for conditional generator expressions (which includes those using IF) says: $<IF:condition,true_string,false_string>. txt file, except that they run even after a return() call. txt file #set (TEST_VAL OFF) #uncomment this to force set Sep 28, 2016 · Stack Overflow Public questions & answers; Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Talent Build your employer brand May 30, 2023 · I use makefile to invoke multiple cmake instances, and these targets are built under different build directories. $<$<CONFIG:Debug>:DEBUG_MODE>. 17. I didn't write the configure. one for 64-bit Linux on Intel, one for 32-bit Windows, etc. 6k 14 112 146. No, this ties your project to single-configuration generators. Aug 15, 2012 · In converting from automake to cmake, I have to carry over some tests for function existence. Fraser. CMake is a cross-platform build system generator. To be more specific, the different targets are the firmware for different models of our products. The conditions inside the parenthesis are evaluated first and then the remaining condition is evaluated as in the other examples. Evaluates to an empty string (no value). There are different types of generator expressions including Logical, Informational, and Output expressions. This answer will work with all these conditions. I believe target_compile_definitions is generally preferred over global add_compile_definitions. However, the following example won't even work with the cmake command itself: ${CMAKE_COMMAND} -E echo $<true:hello> $<false:world>. txt and code files are located. I put the model-specific configurations in a xxxx. When the current config is Debug, it evaluates like this: When the current config is not Debug, it evaluates like this: Nov 28, 2017 · Multiple conditions in vue. set. And both IF NOT EXIST and mkdir return errors if the directory does exist, which causes the copy to not happen. Libs can define their compile flags as Nov 7, 2017 · In case if I want to build a library for multiple architectures at once then it does not work well since cmake prepares build script specifically for each platform/architecture. See the cmake-language (7) variables documentation for the scopes and interaction of normal variables and cache entries. As CMake evaluates the scripts it constructs an internal representation of the software project. Use the add_custom_target() and add_custom_command() commands to create custom commands that run at build time. Most of the time this is simplified to two distinct stages: configuration – when cmake is executed on the project. Compound conditions are evaluated in the following order of precedence: Parentheses. Signatures of this command that specify a <value> placeholder expect zero or more arguments. These two stages are obvious, as they are two Oct 17, 2021 · CMake Config based condition in a multi config generator. Thanks for you reply, but what you give seem does not work in my computer. This is allowed in preset files specifying version 3 or above. cpp file: #ifdef MY_VAR // do something if var defined #endif foreach(<loop_var> IN ZIP_LISTS <lists>) New in version 3. Oct 5, 2011 · Using the VAR1 / VAR2 example it would look like this: ifneq (, $(filter 4, $(VAR1) $(VAR2))) The downside to those methods is that you have to be sure that these arguments will always be single words. This tutorial shows four examples of using nested IF statements in Excel and gives five alternatives to using multiple IF statements in Excel . v-if multiple conditions not working. You may have multiple elseif clauses. If the result is true, the commands in the THEN section are invoked. The following is a description of how you can assess multiple conditions by combining them either using a single construct or using individual structures in Bash ‘if’ statements. You can specify as many commands as you want for a custom command. Set a normal, cache, or environment variable to a given value. answered Sep 4, 2015 at 15:42. and then make (generator expressions are only evaluated at build time). CMake by Example is a hands-on introduction to CMake using annotated example projects. Compound conditions are evaluated in the following order of precedence: Innermost parentheses are evaluated first. However, we use multiple or nested IF statements when evaluating numerous conditions in a specific order to return different results. What is the best practice to build libraries targeting multiple platforms and multi-architecture? Invocation ¶. I just set a cmake variable at the same place the macro is defined. 13: LINK_OPTIONS target property and target_link_options() command. From these files CMake generates a preferred buildsystem locally for each user through a backend called a generator. This will make sure the build always stops if the provided file doesn't exist, it's cross-platform safe and works in every version of cmake since 3. And for the record. The if command was written very early in CMake’s history, predating the ${} variable evaluation syntax, and for convenience evaluates variables named by its arguments as shown in the above signatures. SET(MYDLL my_dlld) ELSE() SET(MYDLL my_dll) ENDIF() I have looked at logical expressions such as. cmake_language (DEFER <options> CALL <command> [<arg>]) ¶. 0. Behavior is well-defined only for full paths. This variable is initialized by the first project() or enable_language() command called in a project when a new build tree is first created. Many/most people won't have this version, so I would like to simply ADD True if the given string or variable’s value matches the given regular condition. However, it should follow the same conventions as the root-level vendor field. Feb 10, 2022 · The CMake documentation states: The following syntax applies to the condition argument of the if, elseif and while() clauses. This makefile then configures cmake, which in turn configures the build system, that can then be used to build the application. Once a target is created, it has properties that you can manipulate using the get_property and set_property commands. By default, deferred calls are executed as if written at the end of the current directory's CMakeLists. There are also a number of enum-like operators that can be used for comparisons. Otherwise, the default value is generator-specific. If it is a relative path, it will be evaluated with respect to the current directory (the typical usage), but it may also be an absolute path. vendor. You may specify one-line shell code with using /bin/sh -c as COMMAND argument: Note, that [ is an extension of the bash, it may be unknown for simple shells like "dash". I linked to the docs in my answer, but it's really only useful for libraries rather than exes. The syntax of CTestTestfile. The flags will then be placed at the toolchain-defined flag position in the link command. Even better with comments: // returns true if the conditions are right to run, // otherwise, return false to indicate a pass. Mar 14, 2014 · Thanks, you set me on the right track. For the "3rd condition" (!CLIENT && !SERVER) libtest_LIBS is set to the value you wanted in the 'else if'. Resolves symbolic links, i. New in version 3. The following syntax applies to the condition argument of the if, elseif and while() clauses. You are encouraged to copy-paste bits from these examples into your own projects as needed. When the current config is Debug, it evaluates like this: When the current config is not Debug, it evaluates like this: Nov 23, 2022 · Giving workflow presets as a whole a condition field would be less risky. A macro defined as. You need to combine add_custom_command with add_custom_target. Next, use the CPACK_INSTALL_CMAKE_PROJECTS variable to specify which projects to install. Unary tests such as EXISTS, COMMAND, and DEFINED. For editors such as Emacs or Vim, CMake includes indentation and syntax highlighting modes. MultiCPackConfig. Apr 19, 2016 · 5. Jul 31, 2018 · According to CMake documentation on if keyword: if(DEFINED &lt;variable&gt;) True if the given variable is defined. cmake-gui(1) offers a file dialog. To configure builds ran form Visual Studio GUI one need to go to Settings: Option "Projects and Solutions → Build And Run → maximum number of parallel projects build" affects on maxcpucount. Otherwise, the commands in the else section are invoked. This step breaks up the complex conditional. May 9, 2024 · 2 Methods to Use Multiple Conditions in Bash “If” Statement. cmake source file in the scope of the including context. e. It does not matter if the variable is true or Jan 26, 2012 · How do I define a preprocessor variable through CMake? The equivalent code would be #define foo. The macro invocation is case-insensitive. Otherwise evaluates to false_string . In this case, we want to install both debug and release. Saves a lot of faff. if constexpr exists to choose between different pieces of code based on whether a particular constant expression yields certain values. Common pre-defined variables to check include: WIN32, UNIX, APPLE, and CYGWIN. Logical expressions are used to create conditional output. Note that normal variable evaluation with ${} applies before the if command even receives the arguments. cmake-gui(1) offers a checkbox. However, if you just need your build to fail if a single file is missing you can use the cmake -E command line mode to compare the file with itself. It can also run under Windows given some work, under Cygwin for instance. 15. If the CMAKE_CONFIGURATION_TYPES environment variable is set, its value is used. We looked at the minimum requirements to configure the CMake build generator for a cross-compilation project using a project definition file (CMakeLists. out as DEPENDS in the conditional target/command. No other path normalization is performed. The basic expressions are the 0 and 1 expressions. Typically macros use all-lowercase names. PATH Path to a directory on disk. Jun 23, 2011 · I would like to check multiple conditions in an if loop of GNU make file. and similarly for mcu_stm32f303. if (NOT (${TARGET_PLATFORM} STREQUAL "test" OR ${TARGET_PLATFORM} STREQUAL "my_board")) or more simply. You can optionally specify a type. GNU Make, referenced here, is the most popular in the Unix-like OSes and often used with autotools. Mar 22, 2023 · Excel IF statement with multiple conditions (AND logic) The generic formula of Excel IF with two or more conditions is this: IF (AND ( condition1, condition2, …), value_if_true, value_if_false) Translated into a human language, the formula says: If condition 1 is true AND condition 2 is true, return value_if_true; else return value_if_false Nov 9, 2011 · There's actually 4 conditions wrt AM_CONDITIONAL: !CLIENT && !SERVER, !CLIENT && SERVER, CLIENT && SERVER, CLIENT && !SERVER. Jun 3, 2012 · Can I specify multiple conditions with "or"/"and" in batch file if block? If not that complex, can I at least use something like: if value1 &lt; value &lt; value2 Basically my purpose is to check 4. On Visual Studio, XCode, and Ninja Multi-Config, the variable will be empty and your build will fail unnecessarily. Most CMake projects advise out of source builds, and assuming you wrote your CMakeLists files correctly you could have May 22, 2017 · A CMake script defines targets using the add_executable, add_library or add_custom_target commands. Jun 20, 2019 · If this post helped you, please consider buying me a coffee or donating via PayPal to support research & publishing of new posts on TechOverflow Feb 26, 2016 · In CMake commands cannot be nested. Your question doesn't have enough detail for me to suggest an alternative to what you're Sep 8, 2023 · EQUAL is for comparing equality of numeric strings: "True if the given string or variable's value is a valid number and equal to that on the right. And then in your *. May 6, 2020 · Then the user (and you) can configure your project according to their needs with the help of ccmake or cmake-gui or with cmake -DTEST_BENCH=ON. Is this still the best way to go, or has CMake gained new capabilities? execute_process runs commands while CMake is configuring the project, prior to build system generation. The documentation mentions that “Each element in the fourth parameter is evaluated In the Step12 directory, create a file called MultiCPackConfig. So I have following code in my CMakeLists. Use the LINK_OPTIONS target property or target_link_options() command to add link flags explicitly. 13. Mar 14, 2015 · I'm using CMake to generate a Visual Studio solution. Or if you have boolean values take the option() definitions command. macro(foo) <commands> endmacro() can be invoked through any of. On Linux, for the same project, I use VSCode and within that I do not make use of any extensions nor do I use CMakePresets. The conditions may be based on the build configuration, target properties, platform information, or any other queryable information. cmake-gui(1) offers a text field or a drop-down selection if the STRINGS cache entry property is set. Generator expressions can be nested: May 15, 2015 · `if(${LINUX64})` will expand to `if()` if LINUX64 is either not defined, or holds an empty string. An optional Condition object. False if the constant is 0, OFF, NO, FALSE, N, IGNORE, NOTFOUND, the empty string, or ends in the suffix -NOTFOUND. There is a choice of when the custom command should be executed. If workflows are going to allow but skip steps that have false conditions, then I would suggest that CMake exits with a success code if at least the configure preset had a true condition, and exits with a failure code otherwise. CMake is the de-facto standard for building C++ code, with over 2 Multiple path separators are effectively collapsed into a single separator, but note that backslashes are not converted to forward slashes. For earlier versions of CMake, use LINK_FLAGS property instead. if the named file or directory is a symbolic link, returns true if the target of the symbolic link exists. The **elseif()** statement is part of CMake's conditional logic control flow, similar to if and else statements in other programming languages. CMake documentation says: True if the constant is 1, ON, YES, TRUE, Y, or a non-zero number. build – when the generated build system is ran in the build directory. For example: MESSAGE("true") MESSAGE("false") The issue is the macro converts each space to a “;” before using the conditional. CMake is quite another beast; it's a different build manager. In my Makefile I would like to check the following complex condition: ifdef VAR1 || VAR2 || VAR3. 10,000 ft View ¶ CMake is a tool that reads script files in its own language that describe how a software project builds. An optional map containing vendor-specific information. From the CMake documentation, the file EXISTS check is only well-defined for full paths: True if the named file or directory exists. Now let us consider a simple custom command for Mar 8, 2018 · I am trying to build native library for android and I need to perform conditional compilation. Depending on the situation, the values in this variable may be treated Sep 26, 2023 · ${projectDir}\cmake\windows\build\x64-Debug" and ${projectDir}\cmake\windows\build\x64-Release" depending on whether the Debug or the Release configuration is chosen. Condition Syntax ¶. It has special discarding mechanics that allow ill-formed code to exist in conditions not taken under certain circumstances. g. CTest can then parse set ¶. if condition in . Dec 11, 2016 · Create a CMakeLists. In this file, first include the default configuration file that was created by the cmake executable. cmake. Evaluates to X. FILEPATH Path to a file on disk. Using multiple v-if Jun 30, 2014 · As of CMake 3. The subdirectories are those that were added by the add_subdirectory commands. Unlike variables, targets are visible in every scope, even if they were defined in a subdirectory. There are four different directives that test different conditions. Feb 6, 2021 · 1. The Jul 31, 2012 · Slightly longer version: I've got a test for various platforms following the advice found here: # Linux specific code. Some editors, such as Notepad++, come with CMake syntax highlighting and indentation support built-in. Schedules a call to the named <command> with the given arguments (if any) to occur at a later time. It will print hello, as expected. Where there are nested parenthesis the innermost are evaluated as part of evaluating the condition that contains them. In order to avoid maintaining multiple such buildsystems, a project may specify its buildsystem abstractly using files written in the CMake language. CMake Language code in either Directories or Scripts may use the include() command to load a <module>. Component-wise comparison is superior to string-based comparison due to the handling of multiple path separators. You can use this function in a conditional to test for the presence of a specific substring in a given string. CMake files. Next come unary tests such as EXISTS, COMMAND, and DEFINED. however the documentation says the syntax like that is not supported. json . Here's an example: Jun 10, 2016 · The findstring function is what your heart desires: Searches in for an occurrence of find. 12 add_definitions has been superseeded by other alternatives. cmake). Chris Maes. com> wrote: > I have read the description of PRE_BUILD before in CMake doc, but when i > use it, i found something confuesed. foo() Foo() FOO() cmake_language(CALL foo) and so on. So the only simple workaround that came to my mind is to use the concatenation: ifneq ($(VAR1)$(VAR2)$(VAR3),) action. Options: COMMAND. By following these guidelines and effectively utilizing else () within your CMake projects, you can ensure robust and well-structured conditional logic, enhancing the clarity and maintainability of your build system. To check multiple conditions in a Bash if statement, you can employ both [ ] and [[ ]] constructs. The foreach command iterates over each list simultaneously setting the iteration variables as follows: if the only loop_var given, then it sets a series of loop_var_N variables to the . txt files way easier to read at many places! Especially if there's a specific order that needs be kept the CMake code gets very big without inline conditionals sometimes, because one needs to repeat the same call everytime. The source_dir specifies the directory in which the source CMakeLists. Dec 28, 2015 · This will evaluate to a 1 if the current config is Debug, and to a 0 otherwise. It allows you to chain multiple conditions and execute different code blocks based on which condition evaluates to true. Project configuration settings may be specified on the command line with the -D option. cmake is like the regular CMake syntax, with a subset of the commands available. Nov 13, 2019 · But “&&” means “execute the second command if the first command succeeded”, which is not how I thought add_custom_command handled multiple commands. ac script, but I do have to reproduce the functionality as closely as fol The syntax of the conditional-directive is the same whether the conditional is simple or complex; after an else or not. So, your condition itself must be a boolean generator expression. To generate a buildsystem with CMake, the following must be selected: Source Tree 25. Multiple path separators are effectively collapsed into a single separator, but note that backslashes are not converted to forward slashes. cmake ¶. Like this: ifeq ($(option), 1) CC=gcc else ifeq ($(option), 2) CC=clang else CC=mipsel-linux-gcc endif My question is, is this a requirement? Or could I have complete different conditional-directives like this: Nov 18, 2015 · 14. INTERNAL add_subdirectory(source_dir [binary_dir] [EXCLUDE_FROM_ALL] [SYSTEM]) Adds a subdirectory to the build. CMake does not interpret the contents of this field except to verify that it is a map if it does exist. I am looking to specify different DLL's to use based on it building in debug or release. They will be executed in the order specified. Jul 11, 2017 · If a is equal to 2 so control check if b is less than 10 and greater than 5 if it is so, control run if's true condition if not so control run else statement c Share Mar 24, 2023 · I think a better solution would be something like this: add_library(mcu_stm32f411 INTERFACE) target_compile_definitions(mcu_stm32f411 INTERFACE STM32F411) target_link_options(mcu_stm32f411 INTERFACE "SHELL:-flag_for linker_script") # or whatever is needed. For each of these configurations, I need to link my project against different versions of my dependencies (i. It seems that cmake_dependent_option does not work with complex conditionals. For example, if VAR1 is 4 foo, the filter result is still 4, and the ifneq expression is still true. Here's an overview of elseif() and its usage in CMake: Usage: They enable conditional linking, conditional definitions used when compiling, conditional include directories, and more. Jul 15, 2019 · Especially 2 months from now when you're trying to debug a thorny condition, and don't remember why you have that big long logic string. The -i option will cause cmake to interactively prompt for such settings. Feb 17, 2021 · Usage. v-if with two conditions. txt), a toolchain definition file (toolchain-STM32F407. Aug 5, 2020 · The same goes for if constexpr; the condition is a constant expression. In CMake's wiki, I found a LIST_CONTAINS macro, but the wiki page is outdated. Vue setting 2 conditions with v-if. Aug 4, 2015 · I added it before my first check in the code snippet above, and it does not enter the true block. The "cmake" executable is the CMake command-line interface. This doesn't appear to work, and the only documentation I can find is a mailing-list post from 2002, which suggests Jan 4, 2020 · Boolean ON/OFF value. js. Putting it together, we have $<$<CONFIG:Debug>:Release>. You can then choose which to use per-target without cmake_language (DEFER <options> CALL <command> [<arg>]) ¶. The answer is to be found in one of Kitware's Blog Posts named "Constraining Values with ComboBoxes in CMake (cmake-gui)": So here’s how it works: for each cache entry that you want to constrain to some set of values, define it as usual with a default value as a STRING cache variable, for example: Now, after defining the cache entry with Modules ¶. You can view the complete rundown on the if | CMake Documentation page. Typically, the condition is a boolean generator expression. Jul 13, 2018 · And the user could change it with cmake-gui or ccmake. ¶. Sorted by: 58. bool should_run(bool a, bool b, bool c, bool d) { // if coach said we don't run May 30, 2015 · You want target_compile_definitions instead of set_target_properties: target_compile_definitions(trie_io_test PRIVATE UNIT_TESTING=1 IO_TEST=1) answered May 30, 2015 at 13:25. Sep 27, 2018 · If the CMake documentation is correct (which in my experience is far from certain), then my question boils down to: How to convert a constant, a variable, or a string X into an expression, with the additional requirement that X is to be evaluated as a boolean? Apr 20, 2021 · In effect it is like a case statement testing one variable against multiple possible values. In this variant, <lists> is a whitespace or semicolon separated list of list-valued variables. SET(OperatingSystem "Linux") I'd like to do a test of the form IF(${CMAKE_SYSTEM_NAME} NOT MATCHES "Linux"). See Regex Specification for regex format. endif. txt file with the above content, run cmake . CMakeLists files can be edited in almost any text editor. Instead, one command could set some variable, and this variable can be dereferenced in the other command. 36. 10 How to check if a CMake build directory build type is Debug or Release? 36 Apr 19, 2016 · On Tue, Apr 19, 2016 at 4:55 PM, Chaos Zhang <zcsd2012 at gmail. 21. – ldav1s. There are several 'make' dialects. STRING A line of text. () groups are captured in CMAKE_MATCH_<n> variables. If CMake is used to generate testing files, they will list any subdirectories that need to be processed as well as any add_test calls. Jun 5, 2023 · 3. If it occurs, the value is find; otherwise, the value is empty. 1k 22 244 219. I want my solution to have multiple configurations - x86 Debug/Release and x86_64 Debug/Release. 77. cd eb yp jo la cx ur ap kc lx