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11.12.2016 · As far as documentation is concerned, only 1 and 0 are recognized within generator expressions. However, as far as the if command is concerned, 1, ON, YES, TRUE, Y are all considered boolean values. This makes some things confusing; for example, one could use the option command to get an input from the user in the configuration phase, and then ...

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. Note that normal variable evaluation with ${} applies before the if command even receives the arguments.

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set(A "") set(B "A") # save name of the variable if(${B} STREQUAL "") message("Value of ${B} is an empty string") endif(). If a CMake policy CMP0054 is set ...

CMake is a tool for defining and managing code builds, primarily for C++. CMake is a cross-platform tool; the idea is to have a single definition of how the project is built - which translates into specific build definitions for any supported platform.

09.09.2018 · CMAKE_HOST_WIN32 is the variable that is set when compiling ON Windows. WIN32 is the variable that is set when compiling FOR a Windows target platform. So CMAKE_HOST_WIN32 is the correct flag to use considering OP's question literally "when I am building on Windows". In many cases WIN32 and CMAKE_HOST_WIN32 will be equivalent, but not in all cases.

I needed some compilation flags to be added in case cmake was invoked with an option from the command line (i.e cmake -DUSE_MY_LIB=ON ). If the ...

Hi, I've just had a CMakeLists.txt fail to work as expected because somebody was testing to see whether an environment variable was set with the syntax: if

Learn how to define variables with set and use them with the ${} operator for variable references. Learn the syntax for conditionals in CMake: if - elseif - ...

Dec 15, 2021 · In Visual Studio 2022 and Visual Studio 2019 version 16.10 and later, Tools > Options > CMake > General has a single option to enable CMakePresets.json integration. The following table indicates when CMakePresets.json is used instead of CMakeSettings.json to drive CMake configuration and build in Visual Studio 2022 and Visual Studio 2019 version 16.10 and later.

28.07.2014 · CMake----if与option使用小记. 在CMake中if语法比较简单，if后面括号中的参数随着CMake版本的推进，在else和endif中也可以不用写了。. 对于if语法，比较常用的就是字符串比较了，这里个人简单用到过两种，一种是这个变量有没有定义过。. 有两种写法可以验证. 两种都 ...

Feb 13, 2015 · Now, the compilation and linking steps all succeed for both compilers/platforms, but I want to get rid of some warnings emited by emcc, using "-Wno-warn-absolute-paths" to not let it complain about absolute paths that CMake always uses when referencing library and include paths and also to activate C++11 support via "-std=c++11" to not let it ...

I had a similar problem and was able to solve it using a slightly different approach. I needed some compilation flags to be added in case cmake was invoked with an option from the command line (i.e cmake -DUSE_MY_LIB=ON).If the option was missing in the cmake invocation I wanted to go back to default case which was turning the option off.. I ran into the same issues, where the value for …

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.

Provides an option for the user to select as ON or OFF . If no initial <value> is provided, OFF is used. If <variable> is already set as a normal or cache variable, then the command does nothing (see policy CMP0077 ). If you have options that depend on the values of other options, see the module help for CMakeDependentOption.

Control Flow

Conditionally execute a group of commands. ... Evaluates the given expression. If the result is true, the commands in the THEN section are invoked. Otherwise, the ...

Programming in CMake Control flow. CMake has an if statement, though over the years it has become rather complex. There are a series of all caps keywords you can use inside an if statement, and you can often refer to variables by either directly by name or using the ${} syntax (the if statement historically predates variable expansion). An example if statement:

If the option was missing in the cmake invocation I wanted to go back to default case which was turning the option off. I ran into the same issues, where the value for this option was being cached between invocations: cmake -DUSE_MY_LIB=ON .. #invokes cmake and puts USE_MY_LIB=ON in CMake's cache. cmake ..

26.08.2020 · 指定 cmake 的最小版本 cmake_minimum_required(VERSION 3.4.1) 这行命令是可选的，我们可以不写这句话，但在有些情况下，如果 CMakeLists.txt 文件中使用了一些高版本 cmake 特有的一些命令的时候，就需要加上这样一行，提醒用户升级到该版本之后再执行 cmake。 2.

Evaluates the condition argument of the if clause according to the Condition syntax described below. If the result is true, then the commands in the if ...

If KEYWORD is a generator expression or variable that evaluates to 0 or 1, value is substituted if 1 and not if 0. You can nest generator expressions, and you ...

option. ¶. Provide an option that the user can optionally select. option (<variable> "<help_text>" [value]) Provides an option for the user to select as ON or OFF . If no initial <value> is provided, OFF is used. If <variable> is already set as a normal or cache variable, then the command does nothing (see policy CMP0077 ). If you have options ...

Conditional Statement (if) ... There are two allowable syntaxes: if(something) do something else(something) # the argument must match the if(...) ...