1# 2# Check for anonymous mmap macros. This is modified from 3# http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_have_ext_slist.html 4# 5AC_DEFUN([AC_HEADER_MMAP_ANONYMOUS], 6[AC_CACHE_CHECK(for MAP_ANONYMOUS vs. MAP_ANON, 7ac_cv_header_mmap_anon, 8[ AC_LANG_PUSH([C]) 9 AC_COMPILE_IFELSE([AC_LANG_PROGRAM( 10 [[#include <sys/mman.h> 11#include <unistd.h> 12#include <fcntl.h>]], 13 [[mmap (0, 1, PROT_READ, MAP_ANONYMOUS, -1, 0); return (0);]])], 14 ac_cv_header_mmap_anon=yes, 15 ac_cv_header_mmap_anon=no) 16 AC_LANG_POP([C]) 17]) 18if test "$ac_cv_header_mmap_anon" = yes; then 19 AC_DEFINE([HAVE_MMAP_ANONYMOUS],[1],[Define if mmap() uses MAP_ANONYMOUS to map anonymous pages, or undefine if it uses MAP_ANON]) 20fi 21]) 22