Question

I’m trying to enable a C-Macro only when the corresponding source file is used by a specific cmake target. Assume I have the following setup:

tests/test.cpp
src/code.cpp
include/code.hpp
CMakeList.txt

code.hpp

class MyClass
{
public:
    void normal_stuff();
#ifdef TEST
    int debug;
    void _dangerous_function()
    {
         debug++;
    }
#endif
}

code.cpp

#include "code.hpp"

MyClass::normal_stuff()
{
    // boring code
}

test.cpp

#include "code.hpp"

void some_test()
{
    MyClass foo;
    foo._dangerous_function();
}

CMakeList.txt

project(foo)
include_directories(include)
file(GLOB_RECURSE foo_source src/*.cpp)
file(GLOB_RECURSE test_source test/*.cpp)
add_executeable(foo ${foo_source})
add_executeable(test ${test_source} ${foo_source})

I want to set TEST only when code.cpp is build for the test target, but not for the foo target. Of course I could just write “#define TEST” in test.cpp before I include code.hpp, but then code.cpp will have a different view of MyClass than test.cpp.

Has anyone an idea how I could do that? I know, I shouldn’t be doing this, but I would like to know, if I could get it running at all.

Answer 1

you may set a target specific property to add such definition:

set_target_properties(test PROPERTIES COMPILE_DEFINITIONS "TEST")

read more here and here