cmake HAVE_MTRACE examples

raspberrypi/userland makefiles/cmake/arm-linux.cmake :116

try_compile(HAVE_MTRACE
            ${CMAKE_BINARY_DIR}
            ${PROJECT_SOURCE_DIR}/makefiles/cmake/srcs/test-mtrace.c
            OUTPUT_VARIABLE foo)

SWI-Prolog/swipl-devel cmake/Config.cmake :229

check_function_exists(mtrace HAVE_MTRACE)