CODEWITHSUNDEEP
shellcmake
user10146018
user10146018

Reputation:

How to get CMake variable of package in shellscript

I want to find the Qt5WaylandClient_PRIVATE_INCLUDE_DIRS variable which is set by the Qt5WaylandClient package. How can I get it from the shell (dash)? Something like this:

cmake -find_package(Qt5WaylandClient) -get_variable Qt5WaylandClient_PRIVATE_INCLUDE_DIRS

or 

cmake -file path/to/my/CMakeLists.txt -get_variable Qt5WaylandClient_PRIVATE_INCLUDE_DIRS

Upvotes: 1

Views: 528

Answers (1)

Kevin
Kevin

Reputation: 18243

CMake does have a --find-package command line option, but it is not well supported, nor well-documented. There is an answer describing its functionality here, but that's probably not what you're looking for.

Initially, it appears you could just run cmake in script mode, using -P, on a CMake file containing your find_package(Qt5WaylandCleint) command and print its variables to the console. 

cmake -P MyFindQt5WaylandClient.cmake

However, running find_package() outside the confines of a CMake project does not work. It yields several errors because CMake doesn't know anything about the system or your target language. So, you must create a minimal CMake project, then run find_package(). Something like this CMakeLists.txt file should work:

cmake_minimum_required(VERSION 3.16)
project(MyProj)

find_package(Qt5WaylandClient REQUIRED)
# Print the desired variable.
message("${Qt5WaylandClient_PRIVATE_INCLUDE_DIRS}")

You can then run cmake from the command line, and this will print the Qt5WaylandClient_PRIVATE_INCLUDE_DIRS variable to the console. You can use the -S and -B command line options to specify the CMake source and binary directories, respectively.

cmake -S . -B build

Upvotes: 3

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