mbrlen: Fix cross-compilation guess for AIX.

[gnulib.git] / m4 / fpending.m4

diff --git a/m4/fpending.m4 b/m4/fpending.m4
index d086ac6..09ae7e3 100644 (file)
--- a/m4/fpending.m4
+++ b/m4/fpending.m4
@@ -1,4 +1,9 @@
-#serial 4
+# serial 15
+
+# Copyright (C) 2000-2001, 2004-2010 Free Software Foundation, Inc.
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
 
 dnl From Jim Meyering
 dnl Using code from emacs, based on suggestions from Paul Eggert
@@ -10,9 +15,10 @@ dnl we have to grub around in the FILE struct.
 
 AC_DEFUN([gl_FUNC_FPENDING],
 [
-  AC_CHECK_HEADERS(stdio_ext.h)
-  AC_REPLACE_FUNCS([__fpending])
+  AC_CHECK_HEADERS_ONCE([stdio_ext.h])
+  AC_CHECK_FUNCS_ONCE([__fpending])
   fp_headers='
+#     include <stdio.h>
 #     if HAVE_STDIO_EXT_H
 #      include <stdio_ext.h>
 #     endif
@@ -20,53 +26,58 @@ AC_DEFUN([gl_FUNC_FPENDING],
   AC_CHECK_DECLS([__fpending], , , $fp_headers)
   if test $ac_cv_func___fpending = no; then
     AC_CACHE_CHECK(
-             [how to determine the number of pending output bytes on a stream],
-                  ac_cv_sys_pending_output_n_bytes,
+              [how to determine the number of pending output bytes on a stream],
+                   ac_cv_sys_pending_output_n_bytes,
       [
-       for ac_expr in                                          \
-                                                               \
-           '# glibc2'                                          \
-           'fp->_IO_write_ptr - fp->_IO_write_base'            \
-                                                               \
-           '# traditional Unix'                                \
-           'fp->_ptr - fp->_base'                              \
-                                                               \
-           '# BSD'                                             \
-           'fp->_p - fp->_bf._base'                            \
-                                                               \
-           '# SCO, Unixware'                                   \
-           'fp->__ptr - fp->__base'                            \
-                                                               \
-           '# old glibc?'                                      \
-           'fp->__bufp - fp->__buffer'                         \
-                                                               \
-           '# old glibc iostream?'                             \
-           'fp->_pptr - fp->_pbase'                            \
-                                                               \
-           '# VMS'                                             \
-           '(*fp)->_ptr - (*fp)->_base'                        \
-                                                               \
-           '# e.g., DGUX R4.11; the info is not available'     \
-           1                                                   \
-           ; do
+        for ac_expr in                                                    \
+                                                                          \
+            '# glibc2'                                                    \
+            'fp->_IO_write_ptr - fp->_IO_write_base'                      \
+                                                                          \
+            '# traditional Unix'                                          \
+            'fp->_ptr - fp->_base'                                        \
+                                                                          \
+            '# BSD'                                                       \
+            'fp->_p - fp->_bf._base'                                      \
+                                                                          \
+            '# SCO, Unixware'                                             \
+            '(fp->__ptr ? fp->__ptr - fp->__base : 0)'                    \
+                                                                          \
+            '# QNX'                                                       \
+            '(fp->_Mode & 0x2000 /*_MWRITE*/ ? fp->_Next - fp->_Buf : 0)' \
+                                                                          \
+            '# old glibc?'                                                \
+            'fp->__bufp - fp->__buffer'                                   \
+                                                                          \
+            '# old glibc iostream?'                                       \
+            'fp->_pptr - fp->_pbase'                                      \
+                                                                          \
+            '# emx+gcc'                                                   \
+            'fp->_ptr - fp->_buffer'                                      \
+                                                                          \
+            '# VMS'                                                       \
+            '(*fp)->_ptr - (*fp)->_base'                                  \
+                                                                          \
+            '# e.g., DGUX R4.11; the info is not available'               \
+            1                                                             \
+            ; do
 
-         # Skip each embedded comment.
-         case "$ac_expr" in '#'*) continue;; esac
+          # Skip each embedded comment.
+          case "$ac_expr" in '#'*) continue;; esac
 
-         AC_TRY_COMPILE(
-           [#include <stdio.h>
-           ],
-           [FILE *fp = stdin; (void) ($ac_expr);],
-           fp_done=yes
-         )
-         test "$fp_done" = yes && break
-       done
+          AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <stdio.h>]],
+            [[FILE *fp = stdin; (void) ($ac_expr);]])],
+            [fp_done=yes]
+          )
+          test "$fp_done" = yes && break
+        done
 
-       ac_cv_sys_pending_output_n_bytes=$ac_expr
+        ac_cv_sys_pending_output_n_bytes=$ac_expr
       ]
     )
-    AC_DEFINE_UNQUOTED(PENDING_OUTPUT_N_BYTES,
+    AC_DEFINE_UNQUOTED([PENDING_OUTPUT_N_BYTES],
       $ac_cv_sys_pending_output_n_bytes,
       [the number of pending output bytes on stream `fp'])
+    AC_LIBOBJ([fpending])
   fi
 ])