diff options
| -rw-r--r-- | m4/ChangeLog | 2 | ||||
| -rw-r--r-- | m4/mmap-stack.m4 | 30 |
2 files changed, 32 insertions, 0 deletions
diff --git a/m4/ChangeLog b/m4/ChangeLog index 0fc86a088..2c72337ad 100644 --- a/m4/ChangeLog +++ b/m4/ChangeLog @@ -1,5 +1,7 @@ 2003-02-15 Jim Meyering <jim@meyering.net> + * mmap-stack.m4: New file. + * jm-macros.m4: Require AC_SYS_MMAP_STACK. Add Irix6 support to physmem.c. diff --git a/m4/mmap-stack.m4 b/m4/mmap-stack.m4 new file mode 100644 index 000000000..cc7e80141 --- /dev/null +++ b/m4/mmap-stack.m4 @@ -0,0 +1,30 @@ +#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 +]) |