LINUX_STACKBOTTOM  854 gc/os_dep.c    #ifdef LINUX_STACKBOTTOM
LINUX_STACKBOTTOM 1021 gc/os_dep.c           defined(LINUX_STACKBOTTOM) || defined(FREEBSD_STACKBOTTOM)
LINUX_STACKBOTTOM 1041 gc/os_dep.c    #	ifdef LINUX_STACKBOTTOM