bug#10154: ylwrap error:

[Stefano Lattarini]

tags 10154 notabug
thanks

On Monday 28 November 2011, Joe Chen wrote:
> Hi,
>
Hi Joe, thanks for the report.

> I am using automake for compile flex input file.  The flex command
> line option --prefix=<STRING> or -P<STRING> works with the direct
> invoking of flex, buy ylwrap gets error all the time for me:
> 
> /bin/bash ../build-aux/ylwrap configf_lexer.l lex.yy.c configf_lexer.c
> -- flex  --case-insensitive --prefix=configf_yy
> make[4]: *** [configf_lexer.c] Error 1
> 
> 
> Is this a known issue?
>
This is not an issue in ylwrap, but rather and usage error.  Let's see
again the help screen from ylwrap:

  Usage: ylwrap INPUT [OUTPUT DESIRED]... -- PROGRAM [ARGS]...
 
  Wrapper for lex/yacc invocations, renaming files as desired.
 
   INPUT is the input file
   OUTPUT is one file PROG generates
   DESIRED is the file we actually want instead of OUTPUT
   PROGRAM is program to run
   ARGS are passed to PROG

  Any number of OUTPUT,DESIRED pairs may be used.

This suggests that, instead of using `--prefix' to modify the name of
the generated `.c' file, you should simply use the DESIRED argument:

 ylwrap configf_lexer.l lex.yy.c configf_lexer.c \
        -- flex --case-insensitive

Or, if you have other reasons to want to stick with the `--prefix'
option (whose exact effects and semantics I don't pretend to know),
you must inform `ylwrap' of the different expected OUTPUT filename:

 ylwrap configf_lexer.l lex.configf_yy.c configf_lexer.c \
        -- flex --case-insensitive --prefix=configf_yy

HTH,
  Stefano