Detect that ldexpl does not work on MacOS X 10.4/PowerPC.

[gnulib.git] / m4 / fcntl_h.m4

diff --git a/m4/fcntl_h.m4 b/m4/fcntl_h.m4
index 35e4b51..e3b9aa5 100644 (file)
--- a/m4/fcntl_h.m4
+++ b/m4/fcntl_h.m4
@@ -1,5 +1,5 @@
 # Configure fcntl.h.
-dnl Copyright (C) 2006 Free Software Foundation, Inc.
+dnl Copyright (C) 2006, 2007 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -8,6 +8,7 @@ dnl Written by Paul Eggert.
 
 AC_DEFUN([gl_FCNTL_H],
 [
+  AC_REQUIRE([gl_FCNTL_H_DEFAULTS])
   AC_CACHE_CHECK([for working fcntl.h], gl_cv_header_working_fcntl_h,
     [AC_RUN_IFELSE(
        [AC_LANG_PROGRAM(
@@ -15,6 +16,9 @@ AC_DEFUN([gl_FCNTL_H],
           #include <sys/stat.h>
           #include <unistd.h>
           #include <fcntl.h>
+          #ifndef O_NOATIME
+           #define O_NOATIME 0
+          #endif
           #ifndef O_NOFOLLOW
            #define O_NOFOLLOW 0
           #endif
@@ -24,27 +28,67 @@ AC_DEFUN([gl_FCNTL_H],
              O_NONBLOCK, O_SYNC, O_ACCMODE, O_RDONLY, O_RDWR, O_WRONLY
            };
          ]],
-         [[static char const sym[] = "conftest.sym";
-           if (O_NOFOLLOW)
-             {
-               if (symlink (".", sym) != 0)
-                 return 1;
-               if (0 <= open (sym, O_RDONLY | O_NOFOLLOW))
-                 return 1;
-             }
-           return !constants;]])],
+         [[
+           int status = !constants;
+           {
+             static char const sym[] = "conftest.sym";
+             if (symlink (".", sym) != 0
+                 || close (open (sym, O_RDONLY | O_NOFOLLOW)) == 0)
+               status |= 32;
+           }
+           {
+             static char const file[] = "confdefs.h";
+             int fd = open (file, O_RDONLY | O_NOATIME);
+             char c;
+             struct stat st0, st1;
+             if (fd < 0
+                 || fstat (fd, &st0) != 0
+                 || sleep (1) != 0
+                 || read (fd, &c, 1) != 1
+                 || close (fd) != 0
+                 || stat (file, &st1) != 0
+                 || st0.st_atime != st1.st_atime)
+               status |= 64;
+           }
+           return status;]])],
        [gl_cv_header_working_fcntl_h=yes],
-       [gl_cv_header_working_fcntl_h=no],
+       [case $? in #(
+       32) gl_cv_header_working_fcntl_h='no (bad O_NOFOLLOW)';; #(
+       64) gl_cv_header_working_fcntl_h='no (bad O_NOATIME)';; #(
+       96) gl_cv_header_working_fcntl_h='no (bad O_NOATIME, O_NOFOLLOW)';; #(
+        *) gl_cv_header_working_fcntl_h='no';;
+       esac],
        [gl_cv_header_working_fcntl_h=cross-compiling])])
 
-  if test $gl_cv_header_working_fcntl_h != yes; then
-    AC_DEFINE([O_NOFOLLOW_IS_INEFFECTIVE], 1,
-      [Define to 1 if O_NOFOLLOW is ineffective.])
-  fi
+  case $gl_cv_header_working_fcntl_h in #(
+  *O_NOATIME* | no | cross-compiling) ac_val=0;; #(
+  *) ac_val=1;;
+  esac
+  AC_DEFINE_UNQUOTED([HAVE_WORKING_O_NOATIME], [$ac_val],
+    [Define to 1 if O_NOATIME works.])
 
-  gl_ABSOLUTE_HEADER([fcntl.h])
-  ABSOLUTE_FCNTL_H=\"$gl_cv_absolute_fcntl_h\"
-  AC_SUBST([ABSOLUTE_FCNTL_H])
+  case $gl_cv_header_working_fcntl_h in #(
+  *O_NOFOLLOW* | no | cross-compiling) ac_val=0;; #(
+  *) ac_val=1;;
+  esac
+  AC_DEFINE_UNQUOTED([HAVE_WORKING_O_NOFOLLOW], [$ac_val],
+    [Define to 1 if O_NOFOLLOW works.])
+
+  gl_CHECK_NEXT_HEADERS([fcntl.h])
   FCNTL_H='fcntl.h'
   AC_SUBST([FCNTL_H])
 ])
+
+AC_DEFUN([gl_FCNTL_MODULE_INDICATOR],
+[
+  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
+  AC_REQUIRE([gl_FCNTL_H_DEFAULTS])
+  GNULIB_[]m4_translit([$1],[abcdefghijklmnopqrstuvwxyz./-],[ABCDEFGHIJKLMNOPQRSTUVWXYZ___])=1
+])
+
+AC_DEFUN([gl_FCNTL_H_DEFAULTS],
+[
+  GNULIB_OPEN=0;  AC_SUBST([GNULIB_OPEN])
+  dnl Assume proper GNU behavior unless another module says otherwise.
+  REPLACE_OPEN=0; AC_SUBST([REPLACE_OPEN])
+])