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#serial 1
# Arrange to define HAVE_MMAP_STACK and to compile mmap-stack.c
# if there is sufficient support.
# From Jim Meyering
AC_DEFUN([AC_SYS_MMAP_STACK],
[
# prerequisites
AC_REQUIRE([AC_FUNC_MMAP])
AC_CHECK_HEADERS_ONCE(sys/mman.h ucontext.h stdarg.h)
AC_CHECK_FUNCS_ONCE(getcontext makecontext setcontext)
# For now, require tmpfile. FIXME: if there's a system with working mmap
# and *context functions yet that lacks tmpfile, we can provide a replacement.
AC_CHECK_FUNCS_ONCE(tmpfile)
ac_i=$ac_cv_func_tmpfile
ac_i=$ac_i:$ac_cv_func_getcontext
ac_i=$ac_i:$ac_cv_func_makecontext
ac_i=$ac_i:$ac_cv_func_setcontext
ac_i=$ac_i:$ac_cv_func_mmap_fixed_mapped
if test $ac_i = yes:yes:yes:yes:yes; then
AC_LIBOBJ(mmap-stack)
AC_DEFINE(HAVE_MMAP_STACK, 1,
[Define to 1 if there is sufficient support (mmap, getcontext,
makecontext, setcontext) for running a process with mmap'd
memory for its stack.])
fi
])
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