project('test_env_in_generator_process', 'c') generate_main_py = find_program('generate_main.py') main_generator = generator(generate_main_py, arguments: ['@INPUT@', '@OUTPUT@'], output: '@BASENAME@' + '.c' ) main_template = files('main.template') # With explicit values my_executable = executable('myexecutable', main_generator.process(main_template, env: {'ENV_VAR_VALUE': '0'})) test('explicit_value', my_executable) # With env object env = environment() env.set('ENV_VAR_VALUE', '0') my_executable2 = executable('myexecutable2', main_generator.process(main_template, env: env)) test('env_object', my_executable2)