AC_DEFUN([AC_HEADER_MMAP_ANONYMOUS],
[AC_CACHE_CHECK(for MAP_ANONYMOUS vs. MAP_ANON,
ac_cv_header_mmap_anon,
-[AC_LANG_SAVE
- AC_LANG_C
- AC_TRY_COMPILE([#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_RESTORE
+[ 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],[],[Define if mmap() uses MAP_ANONYMOUS to map anonymous pages, or undefine if it uses MAP_ANON])
+ AC_DEFINE([HAVE_MMAP_ANONYMOUS],[1],[Define if mmap() uses MAP_ANONYMOUS to map anonymous pages, or undefine if it uses MAP_ANON])
fi
])
-
-