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per the recommended style guide for autoconf and so that individual autoconf functions can more easily be shared across projects. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16223 91177308-0d34-0410-b5e6-96231b3b80d8
23 lines
686 B
Plaintext
23 lines
686 B
Plaintext
#
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# Check for anonymous mmap macros. This is modified from
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# http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_have_ext_slist.html
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#
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AC_DEFUN([AC_HEADER_MMAP_ANONYMOUS],
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[AC_CACHE_CHECK(for MAP_ANONYMOUS vs. MAP_ANON,
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ac_cv_header_mmap_anon,
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[AC_LANG_SAVE
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AC_LANG_C
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AC_TRY_COMPILE([#include <sys/mman.h>
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#include <unistd.h>
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#include <fcntl.h>],
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[mmap (0, 1, PROT_READ, MAP_ANONYMOUS, -1, 0); return (0);],
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ac_cv_header_mmap_anon=yes, ac_cv_header_mmap_anon=no)
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AC_LANG_RESTORE
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])
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if test "$ac_cv_header_mmap_anon" = yes; then
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AC_DEFINE([HAVE_MMAP_ANONYMOUS],[],[Define if mmap() uses MAP_ANONYMOUS to map anonymous pages, or undefine if it uses MAP_ANON])
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fi
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])
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