Re: ioc segfault if - c seq flag is not set or +c?

[Benjamin Franksen <benjamin.franksen@helmholtz-berlin.de>]

Am Montag, 18. April 2011, um 22:42:12 schrieb Andrew Johnson:
> On Monday 18 April 2011 14:24:12 J. Lewis Muir wrote:
> > FYI, there were a few warnings when building seq 2.0.13-rc1.

(BTW, the other warnings (from the C compiler) are ok.)

> This section of Lewis' output is illuminating:
> >preprocessing ../tooLong.st
> >/opt/vxworks-tornado-2.0.2/host/x86-linux/bin/ccppc -x c -E -DCPU=PPC603
> >
> > -DvxWorks -I. -I../O.Common -I. -I.. -I../../../include/os/vxWorks
> > -I../../../include
> > -I/home/jlmuir/tmp/opt/epics-3.14.11/include/os/vxWorks
> > -I/home/jlmuir/tmp/opt/epics-3.14.11/include
> > -I/opt/vxworks-tornado-2.0.2/target/h ../tooLong.st > tooLong.i
> >
> >converting tooLong.i
> >../../../bin/linux-x86_64/snc    tooLong.i -o tooLong.c.tmp
> >line 17: cannot assign variable >l< because on this architecture its
> >(base)
> >
> > type is larger than 4 bytes. Such variables cannot be faithfully mapped
> > to any of the Channel Access base types. Try declaring the variable as
> > 'int' or, if that is still too large on your system, as 'short'.
> >
> >line 20: cannot assign variable >ul< because on this architecture its
> >(base)
> >
> > type is larger than 4 bytes. Such variables cannot be faithfully mapped
> > to any of the Channel Access base types. Try declaring the variable as
> > 'int' or, if that is still too large on your system, as 'short'.
>
> Unfortunately those warnings from snc are wrong, since this is a
> cross-build for the vxWorks-ppc603 architecture where long is 32 bits so
> is legal.

Yes. Sigh.

> Since snc doesn't know what architecture the target will be
> compiled for or what the characteristics of that target are, I think it
> has to defer those size checks to the C compiler when someone uses a long
> variable.  It can do that by generating code like this:
>
> #include <limits.h>
> #if LONG_MAX > 2147483647L
> #  error Cannot assign ...
> #endif
>
> C doesn't allow the use of sizeof in a #if condition, but using LONG_MAX
> like this works fine.

This should be workable. I'll make another pre-release with this fixed.

Thanks
Ben

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