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cmake_minimum_required(VERSION 2.6). project(Unset C). # Local variable. set(x 42). if(NOT x EQUAL 42). message(FATAL_ERROR "x!=42"). endif().

False if the constant is 0, OFF , NO, FALSE, N, IGNORE, NOTFOUND, the empty string, or ends in the suffix -NOTFOUND. Named boolean constants are case-insensitive. If the argument is not one of these specific constants, it is treated as a variable or string (see Variable Expansion further below) and one of the following two forms applies.

CMake non-regular variables like cache and environment variables need ... variable “CI” to detect if CMake is running on a CI or not.

So the test for if a variable is defined works for cmake variables but not for environment variables. I can work around this by testing if the

True if given a variable that is defined to a value that is not a false constant. False otherwise, including if the variable is undefined. Note that macro ...

It's not uncommon for scientific software to be written in C, ... it would be nice if we could integrate the two for our CMake-based projects.

Check if environment variable is set. Test if an environment variable is defined, bail out if it is not. Normally, operating system environment ...

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.

Jul 31, 2012 · I'd like to do a test of the form IF(${CMAKE_SYSTEM_NAME} NOT MATCHES "Linux"). This doesn't appear to work, and the only documentation I can find is a mailing-list post from 2002, which suggests the NOT isn't valid for cmake prior to 1.2. . Is this still the case in later cmake versions, specifically 2.6 and/or 2.8?

30.07.2012 · The correct syntax for IF is. IF (NOT <expression>) So in your specific case, you want. IF (NOT $ {CMAKE_SYSTEM_NAME} MATCHES "Linux"). Share. Follow this answer to receive notifications. answered Jul 31, 2012 at 19:36. Fraser.

Policy CMP0054 is not set to NEW and the string's value happens to be a variable name that is affected by CMP0054 's behavior. ... The if command was written very early in CMake's history, predating the ${} variable evaluation syntax, ...

I'd like to do a test of the form IF(${CMAKE_SYSTEM_NAME} NOT MATCHES "Linux") . This doesn't appear to work, and the only documentation I ...

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 ...

Learn the syntax for conditionals in CMake: if - elseif - else - endif ... if the variable within the ${} operator is not set, you will get an empty string.

Control Flow

if(<variable|string>): True if given a variable that is defined to a value that is not a false constant. False otherwise. (Note macro arguments are not ...

07.12.2006 · most cases before it gets to your IF(NOT DEFINED... (So, it's "always" defined -- in your case.) It is conditionally set from different cmake scripts that are run based on generator and compiler chosen. It is not set at all when using a Visual Studio or Xcode generator, for example, so you can build any configuration

Feb 14, 2022 · It’s possible to check if an environment variables is defined directly in CMake, but checking the value of the environment variable must be done indirectly via a CMake internal variable. An example of this is using environment variable “CI” to detect if CMake is running on a CI or not.

Sep 28, 2020 · CMake seems to be a new tool for you, so there is a learning curve which is not steep for making it working, but some corner case are not always easy to handle at first. As for now, the time effort is unjustified too high to put into cmake everything. what has worked before in IDE/OS configurations…

06.02.2012 · I am a beginner to CMAKE. Below is a simple cmake file which works well in mingw environment windows. The problem is clearly with target_link_libraries() function of CMAKE where I am linking libwsock32.a. In windows this works and I get the results. However, as expected, in Linux, the /usr/bin/ld will look for -lwsock32 which is NOT there on ...