| # |
| # 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 |
| ]) |
