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Provide a check to determine if /dev/zero is needed for AllocateRWX function.

llvm-svn: 19147
This commit is contained in:
Reid Spencer 2004-12-27 06:14:48 +00:00
parent 4887b109fc
commit 2b7aff24f2
1 changed files with 17 additions and 0 deletions
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17
autoconf/m4/need_dev_zero_for_mmap.m4 Normal file
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#
# 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])