CMake - how to set multiple compile definitions fo

Question

I'm trying to set multiple compile definitions for one of the executables I'm trying to compile in CMake (in order to activate macros used for debugging). Here's what I tried:

add_executable (trie_io_test trie_io_test.c trie.c word_list.c)
    set_target_properties(
            trie_io_test
            PROPERTIES
            COMPILE_DEFINITIONS UNIT_TESTING=1)
    set_target_properties(
            trie_io_test
            PROPERTIES
            COMPILE_DEFINITIONS IO_TEST=1)

Unfortunately this causes only the IO_TEST to be defined.

I also tried the following:

add_executable (trie_io_test trie_io_test.c trie.c word_list.c)
    set_target_properties(
            trie_io_test
            PROPERTIES
            COMPILE_DEFINITIONS UNIT_TESTING=1 IO_TEST=1)

But this, on the other hand, causes CMake error.

How to set both of these definitions for the executable I'm trying to build?

Answer 1

You want target_compile_definitions instead of set_target_properties:

target_compile_definitions(trie_io_test PRIVATE UNIT_TESTING=1 IO_TEST=1)