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Questions tagged [cmake-language]

CMake () input files are written in the “CMake Language” in source files named CMakeLists.txt or ending in a .cmake file name extension.

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67 questions
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CMake - How does the if() command treat a symbol? As string or as variable?

I am not sure the CMake if() command will treat a symbol in the condition clause as a variable or a string literal. So I did some experiments. Script1.cmake cmake_minimum_required(VERSION 3.15) set(XXX "YYY") #<========== HERE!! if(XXX STREQUAL…
smwikipedia
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How can I ignore all cmake dev warnings from subdirectories?

I am using a few external libraries that are included as git submodules using the add_subdirectory command. Some of them are using old versions of cmake and they're issuing warnings about policies CMP0048 and CMP0077. Is there a way to turn off all…
Person93
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What's the point of using empty string to set cache variable in CMake?

I've seen different ways of setting / using Cache variables in Cmake. What is the standard? What's the point of setting an empty string ("") to the cache variable? Example set(NVTX_ROOT_DIR "" CACHE PATH "Folder contains NVIDIA NVTX")
Chaitanya Bapat
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How to query whether a target is an INTERFACE library in CMake

In modern CMake one can specify a library as INTERFACE: it does not produce build output, but it can have properties associated to it, although not all properties can be set (for instance the FOLDER property is not supported). Say I have a generic…
Paolo Crosetto
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What's the execution order of CMake's `file(download)` instruction?

I have a CMakeLists.txt, which has a file(download xxx yy) command. There is also a custom_target cpx, which needs this downloaded file. But when the cpx target is invoked, the xxx file is not yet downloaded. So my question is, when will the…
ddwolf
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CMake: Get environment variable with escaped characters

Suppose one wants to use the environment variable MY_VAR in CMake. This may be accomplished simply by using set(myVar $ENV{MY_VAR}). But what if MY_VAR contains escape characters, say MY_VAR="/path/with/escaped\ chars"? CMake treats \ followed by a…
mkl
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CMake set_property command with generator expressions using multiple values

I am using CMake v3.13.4 with the Visual Studio 2017 Win64 generator and I need to modify the command line options for the Visual Studio Librarian (for a CMake object library). To achieve that CMake offers the target property STATIC_LIBRARY_OPTIONS…
Florian Wolters
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Can I control sources exclusion from target_sources in CMake?

I am new in CMake and I was wondering whether there is a possibility to exclude certain sources from target_sources() based on a variable. Let's say I have this below target_sources(myTarget PUBLIC PRIVATE myDir1/src/a.c …
ndarkness
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How to call a cmake method from shell script?

I have a parameterised function in mytestprogram.cmake written like below: function(get_output_from_input output input) set(${output} "test" PARENT_SCOPE) endfunction() Question: How do I call the cmake method get_output_from_input from a…
TheWaterProgrammer
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How to append semicolon (;) to cmake string

In cmake 3.19.2 i try to add semicolon to string by the following way: cmake_minimum_required(VERSION 3.12) project(some_project) #-------------------------------------------------------------------- # Set CPP…
Vladimir Pogonin
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How can I detect what version of macOS my Cmake code is running on?

I need to determine what version of MacOS the cmake file is running on. if(BIGSUR) # do something else() # do something else endif()
rTanna
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Constraining Values with ComboBoxes in CMake (cmake-gui)

I encountered CMake project where cache entry in cmake-gui was presented as combobox. But I can't find this project. How to add cache entry to CMakeLists.txt with values constrained with combobox?
stnk
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How do I make a list in CMake with the semicolon value?

I think it should be super trivial, but seems like it's not supported... Is it even possible in CMake to have one value of a list contain a semicolon? The reason is super simple - because I'm running on Windows, and on Windows the semicolon is the…
The Godfather
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What's the evaluated value of in if() in CMake?

My hello.txt cmake_policy(SET CMP0054 NEW) set(VAR ON) # VAR will be treated as a string if("VAR") message(TRUE) else() message(FALSE) endif() # output prints FALSE From policy CMP0054: To prevent ambiguity, potential variable or keyword…
Izana
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Problem using Qt4 with find_package of CMake, inside a macro

I have defined the following macro in CMake (version 3.10): macro(configureQt4 requiredVersion selectedPackages) message(STATUS "selectedPackages: ${selectedPackages}") find_package(Qt4 ${requiredVersion} COMPONENTS ${selectedPackages}…
Soo
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