project('global arg test', 'cpp', 'c') add_global_arguments('-DMYTHING', language : 'c', native : true) add_global_arguments('-DMYCPPTHING', language : 'cpp', native : true) add_global_arguments('-DGLOBAL_BUILD', language : 'c', native : true) build_c_args = ['-DARG_BUILD'] c_args = ['-DARG_HOST'] add_global_arguments('-DMYCANDCPPTHING', language: ['c', 'cpp'], native: true) exe1 = executable('prog1', 'prog.c', c_args : build_c_args, native : true) test('prog1', exe1)