fflush(), and which detect pipes. */
# define fseeko rpl_fseeko
extern int fseeko (FILE *fp, off_t offset, int whence);
-# define fseek(fp, offset, whence) fseeko (fp, (off_t)(offset), whence)
+# if !@GNULIB_FSEEK@
+# undef fseek
+# define fseek(f,o,w) \
+ (GL_LINK_WARNING ("fseek cannot handle files larger than 4 GB " \
+ "on 32-bit platforms - " \
+ "use fseeko function for handling of large files"), \
+ fseeko (f, o, w))
+# endif
# endif
#elif defined GNULIB_POSIXCHECK
# undef fseeko
# if @REPLACE_FTELLO@
# define ftello rpl_ftello
extern off_t ftello (FILE *fp);
-# define ftell(fp) ftello (fp)
+# if !@GNULIB_FTELL@
+# undef ftell
+# define ftell(f) \
+ (GL_LINK_WARNING ("ftell cannot handle files larger than 4 GB " \
+ "on 32-bit platforms - " \
+ "use ftello function for handling of large files"), \
+ ftello (f))
+# endif
# endif
#elif defined GNULIB_POSIXCHECK
# undef ftello