* aclocal.m4 (grub_CHECK_ENABLE_EXECUTE_STACK): New function. * configure.ac: Call grub_CHECK_ENABLE_EXECUTE_STACK. * include/grub/misc.h [NEED_ENABLE_EXECUTE_STACK]: Export __enable_execute_stack() to modules. * kern/misc.c [NEED_ENABLE_EXECUTE_STACK] (__enable_execute_stack): New function.