Menu
Suppose I have a package called Foo. If I run CMake on a CMakeLists.txt file that contains find_package(Foo), then I can print out the values of variables such as ${Foo_LIBRARIES} and ${Foo_INCLUDES}.
Is there an easy way to display these variables without having to run CMake on a CMakeLists.txt file, and without having to manually inspect the config.cmake file?
795
Another way to view all cmake's internal variables, is by executing cmake with the --trace-expand option. This will give you a trace of all . cmake files executed and variables set on each line.
Run CMake and have a look at the cache with the ccmake GUI tool. Then you'll get all the variables. Or run CMake with -LH then you will get all variables printed after configuration.
You can use the command line to set entries in the Cache with the syntax cmake -D var:type=value , just cmake -D var=value or with cmake -C CMakeInitialCache. cmake . You can unset entries in the Cache with unset(... CACHE) .
Local Variables You access a variable by using ${} , such as ${MY_VARIABLE} . 1. CMake has the concept of scope; you can access the value of the variable after you set it as long as you are in the same scope. If you leave a function or a file in a sub directory, the variable will no longer be defined.
You asked: (1) Is there an easy way to display these variables without having to run cmake on a CMakeLists.txt file, and (2) without having to manually inspect the config.cmake file?
I can give you a yes answer to (2) but it does require that you (re)run cmake. But since you can re-run your cmake configure step by simply executing cmake . in the build directory, re-running cmake should not keep you from trying this approach. My answer is given in this SO answer and uses the get_cmake_property command. Here is that code encapsulated into a cmake macro, print_all_variables, so I can use it when debugging my cmake scripts.
macro(print_all_variables) message(STATUS "print_all_variables------------------------------------------{") get_cmake_property(_variableNames VARIABLES) foreach (_variableName ${_variableNames}) message(STATUS "${_variableName}=${${_variableName}}") endforeach() message(STATUS "print_all_variables------------------------------------------}") endmacro() The macros are invoked with same syntax as cmake functions:
print_all_variables() If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
