| Reid Spencer | 5d01fa5 | 2004-12-27 06:14:48 +0000 | [diff] [blame] | 1 | # |
| 2 | # When allocating RWX memory, check whether we need to use /dev/zero |
| 3 | # as the file descriptor or not. |
| 4 | # |
| 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, |
| Reid Spencer | b09a68e | 2004-12-29 06:59:36 +0000 | [diff] [blame] | 8 | [if test "$llvm_cv_os_type" = "Interix" ; then |
| Reid Spencer | 5d01fa5 | 2004-12-27 06:14:48 +0000 | [diff] [blame] | 9 | ac_cv_need_dev_zero_for_mmap=yes |
| 10 | else |
| 11 | ac_cv_need_dev_zero_for_mmap=no |
| 12 | fi |
| 13 | ]) |
| 14 | if test "$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]) |