The computation of string length is not that complicated. Fix it, again. :)
[llvm/stm8.git] / autoconf / m4 / need_dev_zero_for_mmap.m4
blob57b322830172a74d6c53701d3ccc1c9194282bc6
2 # When allocating RWX memory, check whether we need to use /dev/zero
3 # as the file descriptor or not.
5 AC_DEFUN([AC_NEED_DEV_ZERO_FOR_MMAP],
6 [AC_CACHE_CHECK([if /dev/zero is needed for mmap],
7 ac_cv_need_dev_zero_for_mmap,
8 [if test "$llvm_cv_os_type" = "Interix" ; then
9    ac_cv_need_dev_zero_for_mmap=yes
10  else
11    ac_cv_need_dev_zero_for_mmap=no
12  fi
14 if test "$ac_cv_need_dev_zero_for_mmap" = yes; then
15   AC_DEFINE([NEED_DEV_ZERO_FOR_MMAP],[1],
16    [Define if /dev/zero should be used when mapping RWX memory, or undefine if its not necessary])
17 fi])