/3rd_party/llvm/autoconf/m4/header_mmap_anonymous.m4
https://code.google.com/p/softart/ · m4 · 21 lines · 15 code · 0 blank · 6 comment · 0 complexity · 70779176bf3caf5661204cf8be2460f7 MD5 · raw file
- #
- # Check for anonymous mmap macros. This is modified from
- # http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_have_ext_slist.html
- #
- AC_DEFUN([AC_HEADER_MMAP_ANONYMOUS],
- [AC_CACHE_CHECK(for MAP_ANONYMOUS vs. MAP_ANON,
- ac_cv_header_mmap_anon,
- [ AC_LANG_PUSH([C])
- AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
- [[#include <sys/mman.h>
- #include <unistd.h>
- #include <fcntl.h>]],
- [[mmap (0, 1, PROT_READ, MAP_ANONYMOUS, -1, 0); return (0);]])],
- ac_cv_header_mmap_anon=yes,
- ac_cv_header_mmap_anon=no)
- AC_LANG_POP([C])
- ])
- if test "$ac_cv_header_mmap_anon" = yes; then
- AC_DEFINE([HAVE_MMAP_ANONYMOUS],[1],[Define if mmap() uses MAP_ANONYMOUS to map anonymous pages, or undefine if it uses MAP_ANON])
- fi
- ])