EPICS Controls Argonne National Laboratory

Experimental Physics and
Industrial Control System

1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  <20172018  2019  2020  2021  2022  2023  2024  Index 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  <20172018  2019  2020  2021  2022  2023  2024 
<== Date ==> <== Thread ==>

Subject: Re: Problems with seq 2.2.4 on Windows
From: Andrew Johnson <[email protected]>
To: <[email protected]>
Date: Fri, 13 Jan 2017 11:02:56 -0600
On 01/13/2017 05:02 AM, [email protected] wrote:
> snl.c is autogenerated using the lemon parser and lemon was updated
> between 2.2.3 and 2.2.4
>  
> Looking at the code failing it is:
>  
>     }else{
>       assert( yyact == YY_ERROR_ACTION );
>       yyminorunion.yy0 = yyminor;
> #ifdef YYERRORSYMBOL
>       int yymx;
> #endif
>  
> I think Visual Studio 2010 doesn’t like the declaration of  yymx 
> occurring after an assignment, this wasn’t allowed prior to the C99
> standard I believe.

IIRC the vxWorks 5.5.x compiler will also object to the above source
code; K&R and ANSI C89-rules required all variable declarations to
appear before any other statement within a block, which the above code
violates when YYERRORSYMBOL is defined. GCC has allowed it for a long
time though, so some programmers might never have come across the rule.

Note that the rule applied within any {code block;}, it didn't require
all variable declarations to appear at the beginning of a subroutine
definition. A lot of older EPICS code was written that way, but I don't
know if that was due to misunderstanding the rule or just preferring
that particular coding style. I usually move variable declarations into
the inner-most scope possible when I work on such code nowadays.

- Andrew

-- 
Arguing for surveillance because you have nothing to hide is no
different than making the claim, "I don't care about freedom of
speech because I have nothing to say." -- Edward Snowdon

References:
Problems with seq 2.2.4 on Windows Mark Rivers
RE: Problems with seq 2.2.4 on Windows Mark Rivers
RE: Problems with seq 2.2.4 on Windows freddie.akeroyd

Navigate by Date:
Prev: Problem with parallel make with seq 2.2.4 on Linux Mark Rivers
Next: Re: Problem with parallel make with seq 2.2.4 on Linux Andrew Johnson
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  <20172018  2019  2020  2021  2022  2023  2024 
Navigate by Thread:
Prev: RE: Problems with seq 2.2.4 on Windows Mark Rivers
Next: EPICS Device Support for cRIO and FlexRIO FPGA based devices is now available Enrique Bernal
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  <20172018  2019  2020  2021  2022  2023  2024 
ANJ, 21 Dec 2017 Valid HTML 4.01! · Home · News · About · Base · Modules · Extensions · Distributions · Download ·
· Search · EPICS V4 · IRMIS · Talk · Bugs · Documents · Links · Licensing ·