[SOLVED] How to use add_definititions() variable inside c++ classes?

Issue

I have defined a couple of variables in my CMakeLists.txt like so:

# the subject of the commit
execute_process(
  COMMAND git log -1 --format=%s
  WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
  OUTPUT_VARIABLE GIT_COMMIT_SUBJECT
  ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE
)

add_definitions("-DGIT_COMMIT_SUBJECT=${GIT_COMMIT_SUBJECT}")

How could I access the GIT_COMMIT_SUBJECT inside my classes?

Like so:

int main(int argc, char* argv[])
{
    printf("GIT_COMMIT_SUBJECT = %s \n", GIT_COMMIT_SUBJECT);
}

Solution

You can define macros as strings when building, but you need to enclose the strings in double-quotes:

add_definitions("-DGIT_COMMIT_SUBJECT=\"${GIT_COMMIT_SUBJECT}\"")

Now any use of the macro GIT_COMMIT_SUBJECT inside the code will be replace by a literal string.

Answered By - Some programmer dude