| # | |
| # When allocating RWX memory, check whether we need to use /dev/zero | |
| # as the file descriptor or not. | |
| # | |
| AC_DEFUN([AC_NEED_DEV_ZERO_FOR_MMAP], | |
| [AC_CACHE_CHECK([if /dev/zero is needed for mmap], | |
| ac_cv_need_dev_zero_for_mmap, | |
| [if test "$llvm_cv_os_type" = "Interix" ; then | |
| ac_cv_need_dev_zero_for_mmap=yes | |
| else | |
| ac_cv_need_dev_zero_for_mmap=no | |
| fi | |
| ]) | |
| if test "$ac_cv_need_dev_zero_for_mmap" = yes; then | |
| AC_DEFINE([NEED_DEV_ZERO_FOR_MMAP],[1], | |
| [Define if /dev/zero should be used when mapping RWX memory, or undefine if its not necessary]) | |
| fi]) |