1*76c7fc5fSjoerg# 2*76c7fc5fSjoerg# Check for anonymous mmap macros. This is modified from 3*76c7fc5fSjoerg# http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_have_ext_slist.html 4*76c7fc5fSjoerg# 5*76c7fc5fSjoergAC_DEFUN([AC_HEADER_MMAP_ANONYMOUS], 6*76c7fc5fSjoerg[AC_CACHE_CHECK(for MAP_ANONYMOUS vs. MAP_ANON, 7*76c7fc5fSjoergac_cv_header_mmap_anon, 8*76c7fc5fSjoerg[ AC_LANG_PUSH([C]) 9*76c7fc5fSjoerg AC_COMPILE_IFELSE([AC_LANG_PROGRAM( 10*76c7fc5fSjoerg [[#include <sys/mman.h> 11*76c7fc5fSjoerg#include <unistd.h> 12*76c7fc5fSjoerg#include <fcntl.h>]], 13*76c7fc5fSjoerg [[mmap (0, 1, PROT_READ, MAP_ANONYMOUS, -1, 0); return (0);]])], 14*76c7fc5fSjoerg ac_cv_header_mmap_anon=yes, 15*76c7fc5fSjoerg ac_cv_header_mmap_anon=no) 16*76c7fc5fSjoerg AC_LANG_POP([C]) 17*76c7fc5fSjoerg]) 18*76c7fc5fSjoergif test "$ac_cv_header_mmap_anon" = yes; then 19*76c7fc5fSjoerg AC_DEFINE([HAVE_MMAP_ANONYMOUS],[1],[Define if mmap() uses MAP_ANONYMOUS to map anonymous pages, or undefine if it uses MAP_ANON]) 20*76c7fc5fSjoergfi 21*76c7fc5fSjoerg]) 22