'fflush' tweak

[Bruno Haible]

For the later support of "gnulib-tool --posixcheck" (or similar), I'm
applying this:

2007-04-25  Bruno Haible  <address@hidden>

        * lib/stdio_.h (fflush): Add support for GNULIB_POSIXCHECK.

*** lib/stdio_.h        10 Apr 2007 03:09:07 -0000      1.16
--- lib/stdio_.h        25 Apr 2007 07:04:30 -0000
***************
*** 207,217 ****
  # endif
  #endif
  
! #if @GNULIB_FFLUSH@ && @REPLACE_FFLUSH@
! # define fflush rpl_fflush
    /* Flush all pending data on STREAM according to POSIX rules.  Both
       output and seekable input streams are supported.  */
    extern int fflush (FILE *gl_stream);
  #endif
  
  #ifdef __cplusplus
--- 207,226 ----
  # endif
  #endif
  
! #if @GNULIB_FFLUSH@
! # if @REPLACE_FFLUSH@
! #  define fflush rpl_fflush
    /* Flush all pending data on STREAM according to POSIX rules.  Both
       output and seekable input streams are supported.  */
    extern int fflush (FILE *gl_stream);
+ # endif
+ #elif defined GNULIB_POSIXCHECK
+ # undef fflush
+ # define fflush(f) \
+    (GL_LINK_WARNING ("fflush is not always POSIX compliant - " \
+                      "use gnulib module fflush for portable " \
+                      "POSIX compliance"), \
+     fflush (f))
  #endif
  
  #ifdef __cplusplus