diff options
| -rw-r--r-- | autoconf/m4/need_dev_zero_for_mmap.m4 | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/autoconf/m4/need_dev_zero_for_mmap.m4 b/autoconf/m4/need_dev_zero_for_mmap.m4 new file mode 100644 index 0000000000..352c5186db --- /dev/null +++ b/autoconf/m4/need_dev_zero_for_mmap.m4 @@ -0,0 +1,17 @@ +# +# 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]) |