CMakeObjects.PL: Restrict check of __attribute__((flatten)) on GCC compliant compilers
CMakeObjects.PL: Restrict check of __attribute__((flatten)) on GCC compliant compilers

jddurand/c-marpaESLIF,jddurand/c-marpaESLIF,jddurand/c-marpaESLIF,jddurand/c-marpaESLIF,jddurand/c-marpaESLIF