| # | |
| # 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 | |
| ]) |