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2b7aff24f2
Provide a check to determine if /dev/zero is needed for AllocateRWX function. llvm-svn: 19147
18 lines
555 B
Plaintext
18 lines
555 B
Plaintext
#
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# When allocating RWX memory, check whether we need to use /dev/zero
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# as the file descriptor or not.
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#
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AC_DEFUN([AC_NEED_DEV_ZERO_FOR_MMAP],
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[AC_CACHE_CHECK([if /dev/zero is needed for mmap],
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ac_cv_need_dev_zero_for_mmap,
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[if test "$llvm_cv_os_type" == "Interix" ; then
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ac_cv_need_dev_zero_for_mmap=yes
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else
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ac_cv_need_dev_zero_for_mmap=no
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fi
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])
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if test "$ac_cv_need_dev_zero_for_mmap" = yes; then
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AC_DEFINE([NEED_DEV_ZERO_FOR_MMAP],[1],
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[Define if /dev/zero should be used when mapping RWX memory, or undefine if its not necessary])
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fi])
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