(g77.info.gz) Output Assumed To Flush

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 Output Assumed To Flush
 -----------------------
 
    For several versions prior to 0.5.20, `g77' configured its version
 of the `libf2c' run-time library so that one of its configuration
 macros, `ALWAYS_FLUSH', was defined.
 
    This was done as a result of a belief that many programs expected
 output to be flushed to the operating system (under UNIX, via the
 `fflush()' library call) with the result that errors, such as disk
 full, would be immediately flagged via the relevant `ERR=' and
 `IOSTAT=' mechanism.
 
    Because of the adverse effects this approach had on the performance
 of many programs, `g77' no longer configures `libf2c' (now named
 `libg2c' in its `g77' incarnation) to always flush output.
 
    If your program depends on this behavior, either insert the
 appropriate `CALL FLUSH' statements, or modify the sources to the
 `libg2c', rebuild and reinstall `g77', and relink your programs with
 the modified library.
 
    (Ideally, `libg2c' would offer the choice at run-time, so that a
 compile-time option to `g77' or `f2c' could result in generating the
 appropriate calls to flushing or non-flushing library routines.)
 
     Always Flush Output, for information on how to modify the
 `g77' source tree so that a version of `libg2c' can be built and
 installed with the `ALWAYS_FLUSH' macro defined.
 

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