how to read variables from CMakeLists.txt to cpp file

Question

if (WITH_TEST)
    add_subdirectory(test/unitTesting)
endif(WITH_TEST)

How do you read the with_test variable in a .cpp file?

[add_definitions](https://cmake.org/cmake/help/latest/command/add_definitions.html) — KamilCuk, Jun 11 '19 at 12:32
[target_compile_definitions](https://cmake.org/cmake/help/v3.0/command/target_compile_definitions.html) is better — Guillaume Racicot, Jun 11 '19 at 12:33

score 0 · Answer 1 · answered Jun 11 '19 at 12:34

0

A solution could be to add preprocessor definition.

in your CMakeLists :

add_definitions(-DWITH_TEST_VALUE ="${WITH_TEST}")

And in you source code you could do something like this :

#ifdef WITH_TEST_VALUE
constexpr auto WITH_TEST = WITH_TEST_VALUE;
#else
 // something 
#endif

answered Jun 11 '19 at 12:34

Badr El Hiouel

cmake -DWITH_TEST=ON ../ when it compiles it gives error i.e c++: error: =ON: No such file or directory – B.Y. PATIL Jun 12 '19 at 05:38

1 Answers1