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| author | Reid Spencer <rspencer@reidspencer.com> | 2004-09-07 06:56:14 +0000 |
|---|---|---|
| committer | Reid Spencer <rspencer@reidspencer.com> | 2004-09-07 06:56:14 +0000 |
| commit | 491f6812ef173989612d987fa8706fd38e2e673f (patch) | |
| tree | 0ba6404a9be355d9bbd5e526efe32e3b0bc29afa /autoconf/m4/header_mmap_anonymous.m4 | |
| parent | 10c0a2e7f955cbe6cc8c842e6d8aebc10ac91f4c (diff) | |
| download | llvm-491f6812ef173989612d987fa8706fd38e2e673f.tar.gz llvm-491f6812ef173989612d987fa8706fd38e2e673f.tar.bz2 llvm-491f6812ef173989612d987fa8706fd38e2e673f.tar.xz | |
Individual autoconf function broken out of acincludes.m4. This change
per the recommended style guide for autoconf and so that individual
autoconf functions can more easily be shared across projects.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16223 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'autoconf/m4/header_mmap_anonymous.m4')
| -rw-r--r-- | autoconf/m4/header_mmap_anonymous.m4 | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/autoconf/m4/header_mmap_anonymous.m4 b/autoconf/m4/header_mmap_anonymous.m4 new file mode 100644 index 0000000000..409189b0ee --- /dev/null +++ b/autoconf/m4/header_mmap_anonymous.m4 @@ -0,0 +1,22 @@ +# +# 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_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 +]) +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]) +fi +]) + + |