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| author | Shih-wei Liao <sliao@google.com> | 2010-02-10 11:10:31 -0800 |
|---|---|---|
| committer | Shih-wei Liao <sliao@google.com> | 2010-02-10 11:10:31 -0800 |
| commit | e264f62ca09a8f65c87a46d562a4d0f9ec5d457e (patch) | |
| tree | 59e3d57ef656cef79afa708ae0a3daf25cd91fcf /autoconf/m4/func_mmap_file.m4 | |
| download | external_llvm-e264f62ca09a8f65c87a46d562a4d0f9ec5d457e.zip external_llvm-e264f62ca09a8f65c87a46d562a4d0f9ec5d457e.tar.gz external_llvm-e264f62ca09a8f65c87a46d562a4d0f9ec5d457e.tar.bz2 | |
Check in LLVM r95781.
Diffstat (limited to 'autoconf/m4/func_mmap_file.m4')
| -rw-r--r-- | autoconf/m4/func_mmap_file.m4 | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/autoconf/m4/func_mmap_file.m4 b/autoconf/m4/func_mmap_file.m4 new file mode 100644 index 0000000..372c87f --- /dev/null +++ b/autoconf/m4/func_mmap_file.m4 @@ -0,0 +1,26 @@ +# +# Check for the ability to mmap a file. +# +AC_DEFUN([AC_FUNC_MMAP_FILE], +[AC_CACHE_CHECK(for mmap of files, +ac_cv_func_mmap_file, +[ AC_LANG_PUSH([C]) + AC_RUN_IFELSE([ + AC_LANG_PROGRAM([[ +#include <sys/types.h> +#include <sys/mman.h> +#include <fcntl.h> +]],[[ + int fd; + fd = creat ("foo",0777); + fd = (int) mmap (0, 1, PROT_READ, MAP_SHARED, fd, 0); + unlink ("foo"); + return (fd != (int) MAP_FAILED);]])], + [ac_cv_func_mmap_file=yes],[ac_cv_func_mmap_file=no],[ac_cv_func_mmap_file=no]) + AC_LANG_POP([C]) +]) +if test "$ac_cv_func_mmap_file" = yes; then + AC_DEFINE([HAVE_MMAP_FILE],[],[Define if mmap() can map files into memory]) + AC_SUBST(MMAP_FILE,[yes]) +fi +]) |