/3rd_party/llvm/autoconf/m4/header_mmap_anonymous.m4

https://code.google.com/p/softart/ · m4 · 21 lines · 15 code · 0 blank · 6 comment · 0 complexity · 70779176bf3caf5661204cf8be2460f7 MD5 · raw file

  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. #
  5. AC_DEFUN([AC_HEADER_MMAP_ANONYMOUS],
  6. [AC_CACHE_CHECK(for MAP_ANONYMOUS vs. MAP_ANON,
  7. ac_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. ])
  18. if 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])
  20. fi
  21. ])