EXPORTED_SYMBOL_FILE using mingw and cmake

[oota-llvm.git] / autoconf / m4 / func_mmap_file.m4

diff --git a/autoconf/m4/func_mmap_file.m4 b/autoconf/m4/func_mmap_file.m4
index 707a1d1b5f9a524f5cbef6452aa7001d0572212e..372c87fbe5c6fc08adb9bae17b58b4bdb2c0890b 100644 (file)
--- a/autoconf/m4/func_mmap_file.m4
+++ b/autoconf/m4/func_mmap_file.m4
@@ -4,26 +4,20 @@
 AC_DEFUN([AC_FUNC_MMAP_FILE],
 [AC_CACHE_CHECK(for mmap of files,
 ac_cv_func_mmap_file,
-[AC_LANG_SAVE
-  AC_LANG_C
-  AC_TRY_RUN([
-#ifdef HAVE_SYS_TYPES_H
+[ AC_LANG_PUSH([C])
+  AC_RUN_IFELSE([
+    AC_LANG_PROGRAM([[
 #include <sys/types.h>
-#endif
-
-#ifdef HAVE_SYS_MMAN_H
 #include <sys/mman.h>
-#endif
-
-#ifdef HAVE_FCNTL_H
 #include <fcntl.h>
-#endif
-
+]],[[
   int fd;
-  int main () {
-  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_LANG_RESTORE
+  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])