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<p><span class="obitlist-title">Cmake function definition scope. In a function, ARGN, ARGC, ARGV and ARGV0, ARGV1, .</span>
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<div class="hidden-xs">Cmake function definition scope A function opens a new scope: see set(var PARENT_SCOPE) for details. txt, the variable V is searched in the scope of that script, not from the scope of sub/CMakeLists. Functions and Macros basics. txt where . For example: Function Scope. Invocation. The above example can be written in the more concise and more robust form: The <commands> in the function definition are recorded; they are not executed until the function is invoked. This is equivalent to cmake_policy(PUSH) with an automatic cmake_policy(POP) when leaving the block scope. ├── bar │ └── CMakeLists. txt, which is affected by the set() commands inside child/CMakeLists. So, if you set a variable in a function and want it to be visible outside, you’ll need PARENT_SCOPE. In contrast, macro pastes its content in the caller's scope. Command Definitions created by the function() command create commands that, when invoked, process the recorded commands in a new variable binding scope. SCOPE_FOR. Function-style definitions are not supported. Directory Scope Using CMAKE_CURRENT_FUNCTION_LIST_DIR inside the function instead eliminates the need for the extra variable which would otherwise be visible outside the function's scope. txt └── CMakeLists. This separation of variables (or scopes) has to work on many levels—when one function calls another, the same separation rules apply. A function or macro always define a new command. Regular (non-cache) variables are scoped to directories, functions, and block()s, and are only visible to script code in the same directory function, and block scope (same function scope, and same directory level, or subdirectories added by add_subdirectory). Dec 28, 2024 · In CMake, function creates a scope where variables are local and do not affect parent scope variables. A variable "set" or "unset" binds in this scope and is visible for the current function and any nested calls within it, but not after the function returns. Macro CMake provides two types of user-defined functions “macros” and “functions”. May 8, 2025 · That is, if you call test function from the top-level CMakeLists. See Also; Previous topic. The function invocation is case-insensitive. message(${arg}) Checking that ${ARGC} is greater than # is the only way to ensure that ${ARGV#} was passed to the function as an extra argument. Nonetheless, there are a few important differences. A subdirectory has its own scope. See the cmake-buildsystem(7) manual for more on defining buildsystem properties. However, my module’s functions don’t actually work because the files that the function requires are buried deep inside the cmake build The <commands> in the function definition are recorded; they are not executed until the function is invoked. Dec 29, 2022 · Yes, they are scoped differently. I have achieved bringing this into another project using the Fetch Content pattern presented by Craig Scott in his book (and likely by others too). Specify which scopes must be created. Let’s take a look at making a CMake macro or function. The only difference between a function and a macro is scope; macros don’t have one. Variables in CMake are directory, function, and block scoped. Function vs. I have been attempting to setup a git repository that will contain cmake modules. e. Feb 1, 2021 · In this post I’ll discuss the basic use of functions and macros in CMake. md file states the following: Jan 14, 2012 · I expected this to be difficult, nay impossible, because CMake does not seem to have the concept of global variables. The previous state of the variable's value stays the same in the current scope (e. /CMakeLists. This chapter focuses on avoiding those gotchas. set(PARENT_SCOPE) will set the value of a variable into the parent directory, calling function, or encompassing scope (whichever is applicable to the case at hand). " Dec 22, 2015 · The scope of the child CMakeList child/CMakeLists. POLICIES. A function opens a new scope: see set(var PARENT_SCOPE) for details. See the cmake_policy() command documentation for the behavior of policies inside functions. A function defined as Additionally ARGV holds the list of all arguments given to the function and ARGN holds the list of arguments past the last expected argument. Create a new policy scope. Invocation¶ A function opens a new scope: see set(var PARENT_SCOPE) for details. txt is. Invocation¶ See the cmake-generator-expressions(7) manual for available expressions. CMake will automatically escape the value correctly for the native build system (note that CMake language syntax may require escapes to specify some values). Table of Contents. I realize there are PROJECT_… and CURRENT_… variables for which the answers are clear based on both names and documentation. May 24, 2020 · CMake functions introduce new scopes, a variable modified inside the function won’t be accessible outside the function. The cmake output: At last, the source_list is:"nothing" Someone suggested that to use macro instead of function, but I do need use local variable, so I need to use the function instead of macro. CMake has two scopes: Function scope: For when custom functions defined with function() are executed. Mar 25, 2015 · All variables in CMake are local by default. When CMake starts processing commands in a source file it sets this variable to the location of the file. Hence, typing If used, it must be a verbatim repeat of the argument of the opening function command. Invocation¶ Dec 6, 2023 · Hello, I am new here. Macro vs Function¶ The macro command is very similar to the function() command. If SCOPE_FOR is not specified, this is equivalent to: When CMake finishes processing commands from the file it restores the previous value. Mar 10, 2020 · In CMake macros and functions has global visibility and nothing can change that. If you want true CMake variables and/or better CMake scope control you should look at the function command. Therefore the value of the variable inside a macro or function is the file invoking the bottom-most entry on the call stack, not the file containing the macro or function definition. Targets are visible at any scope after the point that they have been defined. As we can see in the codes above, they’re very similar. A function defined as Line 1: This is the definition of the my_function function, which takes two arguments arg1 and arg2. , if it was undefined before, it is still undefined and if it had a value, it is still that value). Apr 27, 2015 · Consider the following minimal example:. This property will be initialized in each directory by its value in the directory's parent. Any leading -D on an item will be removed. txt which do not use PARENT_SCOPE. The value has dynamic scope. In a function, ARGN, ARGC, ARGV and ARGV0, ARGV1, are true variables in the If explicitly needed, functions should have read/write access to global variables as well. This option can be used in SET() statements of subordinate modules to set a variable in the scope of the calling module, i. Invocation¶ The function invocation is case-insensitive. Lines 2–3: The message() method is used to print values to the terminal. Given that a scope has a reference to the scope it was copied from, it maybe isn't surprising that there's a way in CMake to affect the parent scope: set(FOO <foo value> PARENT_SCOPE) Jun 24, 2015 · An example would be function(xyz _resultVar) is setting If no normal variable with the given name is defined in the current scope, CMake will look for a matching A function opens a new scope: see set(var PARENT_SCOPE) for details. Invocation¶ Oct 29, 2023 · 使用 CMake 的函数（function 通过使用不同的变量名字，在函数自行结束时再修改到外层 scope 的 result0 function (check_cmake The cmake-buildsystem(7) manual for more on defining buildsystem properties. When you set a variable, it is visible to the current CMakeLists file or function and any subdirectory’s CMakeLists files, any functions or macros that are invoked, and any files that are included using the include command. How can I correctly set the global variable source_list in the function test()? Can't cmake do it in a simple and normal way? A function opens a new scope: see set(var PARENT_SCOPE) for details. And so it was difficult to find their definition. Is there in CMake a way to mimic to C++ namespaces, by prefixing the functions calls, so that it would be easier to The <commands> in the function definition are recorded; they are not executed until the function is invoked. That makes macros suitable for defining very small bits of functionality only. Such prefix plays the role of a signal to outer code "not to use me". The other difference between CMake functions and macros is how arguments are passed. While you can use the PARENT_SCOPE parameter to increase the scope of a local variable by one layer, that mostly makes sense for return values of functions. Aug 31, 2017 · The trick is realizing that the scope copying limits the impact of the changes you make to these variables . UPDATE (1/29/2021) Add the following statement after the statement Moo(${var}) to make the difference between macro and function even more clear. As CMake processes the listfiles in your project this variable will always be set to the one currently being processed. The <commands> in the function definition are recorded; they are not executed until the function is invoked. A function defined as The <commands> in the function definition are recorded; they are not executed until the function is invoked. Instead, I was pleasantly surprised to find out about the option PARENT_SCOPE. add_custom_target. Empty items are ignored. add_definitions. Invocation¶ Purpose and Scope. They’re actually defined somewhere, in a Git submodule, trough very indirect ways. This will make the function difficult to use. 8 ) set( FOO "Exists in both, parent AND in child scope. Parent Scope. See the macro() command documentation for differences between CMake functions and macros. Line 4: This is the end of the function definition. VARIABLES. Create a new variable scope. Per legacy, the endfunction() command admits an optional <name> argument. This means variables set in macros will bleed out into the calling scope. Another problem in CMake, the functions don’t return any value. A function defined as Apr 24, 2018 · 我已经编写了一个我喜欢的函数来下载和构建外部资源。然而，作为一个实际问题，我遇到了cmake函数的作用域问题，我想公开函数外部的变量。我已经尝试了GLOBAL PROPERTY，PARENT_SCOPE，CACHE STRING和CACHE INTERNAL都没有成功。如何更新下面函数中的“全局”变量？function(DownloadExternal name source options li Sep 17, 2024 · Functions have their own scope, and macros don’t. The Modern CMake System provides a contemporary build and test execution framework for the LLVM Test Suite, serving as the recommended alternative A function opens a new scope: see set(var PARENT_SCOPE) for details. Line 6: Calling our function with the values Hello and World. the parent. CMAKE_CURRENT_LIST_FILE Full path to the listfile currently being processed. Variable Scope¶. Variables in CMake have a scope that is a little different from most languages. A function defined as If used, it must be a verbatim repeat of the argument of the opening function command. Often a function, "internal" to some module, is defined with underscore ( _ ) prefix. At a first glance, CMake functions and macros behave exactly as one would expect, having experience with any of the C/C++ family of languages. txt: include_directories($(MACRO_UTILS_INC_FOLDER)) a generated readme. g. If you want to set the value both for the current scope and for the parent, you have to issue two set commands: While the process of declaring a function is straightforward there are some gotchas to keep in mind. txt made in the company where I work, and there are some calls to non-standard functions. You are correct that PARENT_SCOPE sets the value in the parent scope only. If not inside a function, it ensures the variables are propagated to the parent file or directory scope. Only special variables like CMAKE_CURRENT_FUNCTION_LIST_DIR or CMAKE_CURRENT_FUNCTION are exception from that rule: they are expanded according to Feb 8, 2012 · They are string replacements much like the C preprocessor would do with a macro. If used, it must be a verbatim repeat of the argument of the opening function command. For example, the following are all equivalent: The <commands> in the function definition are recorded; they are not executed until the function is invoked. May 24, 2020 · CMake supports both functions and macros to provide a named abstraction for some repetitive works. project( foo ) cmake_minimum_required( VERSION 2. Jun 9, 2020 · When the CMake Generator (cmake -G “Eclipse CDT4 - Unix Makefiles”) process the following command found in CMakeLists. Nov 23, 2023 · Hello, I am trying to understand some CMakeLists. Once the basics are covered I then move on to demonstrating the uses of cmake_parse_arguments. The only difference is that “functions” create a new scope, whereas “macros” do not. The only difference is in scope; a macro does not make a new scope, while a function does. A function defined as Inside a function, this ensures the variables are propagated to the function's caller, regardless of any blocks within the function. Invocation¶ Apr 17, 2024 · When I see a variable like CMAKE_ARCHIVE_OUTPUT_DIRECTORY being set I always wonder whether it affects just the current project or directory, or whether it is truly global, and I’m not sure how to tell other than by running experiments. See also CMAKE_PARENT_LIST_FILE and CMAKE_CURRENT_FUNCTION_LIST_FILE. You can set a variable in the parent scope of a given scope by using the PARENT_SCOPE argument of the set command. add_subdirectory creates a new directory "child scope". Is that pattern upheld . When CMake finishes processing commands from the file it The <commands> in the function definition are recorded; they are not executed until the function is invoked. txt which defines given function. This article explains an introduction to You can define your own CMake function or macro easily. A function defined as A function opens a new scope: see set(var PARENT_SCOPE) for details. 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