Warning annoyances in list_read.c

Markus Trippelsdorf markus@trippelsdorf.de
Mon Mar 27 06:58:00 GMT 2017


On 2017.03.26 at 19:30 -0700, Steve Kargl wrote:
> On Sun, Mar 26, 2017 at 06:45:07PM -0700, Jerry DeLisle wrote:
> > On 03/26/2017 11:45 AM, Steve Kargl wrote:
> > > On Sun, Mar 26, 2017 at 11:27:59AM -0700, Jerry DeLisle wrote:
> > >>
> > >> +#pragma GCC diagnostic push
> > >> +#pragma GCC diagnostic ignored "-Wimplicit-fallthrough"
> > > 
> > > IMNSHO, the correct fix is to complain loudly to whomever
> > > added -Wimplicit-fallthrough to compiler options.  It should
> > > be removed (especially if is has been added to -Wall).
> > > 
> > > You can also probably add -Wno-implicit-fallthrough to 
> > > libgfortran/configure.ac at 
> > > 
> > > # Add -Wall -fno-repack-arrays -fno-underscoring if we are using GCC.
> > > if test "x$GCC" = "xyes"; then
> > >   AM_FCFLAGS="-I . -Wall -Werror -fimplicit-none -fno-repack-arrays -fno-underscoring"
> > > 
> > 
> > Problem I have is I don't know who to complain to. I think there is a bit of a
> > glass wall going on here anyway, so what would be the point of complaining if
> > the retrievers of the message all have the ON-OFF switch in the OFF position.
> > (After all, I do not have a PHD, I am not a computer science graduate, why
> > bother looking down ones nose at a low life such as myself, OMG its an engineer,
> > what the hell does he know.)
> > 
> > Maybe these warnings are being turned on as a matter of policy, but truth is,
> > when I build 50 times a day, the warnings flying by are masking the errors or
> > other warnings that may be important. For example, I inadvertently passed a ptr
> > to a function rather than the *ptr.
> > 
> > The warning that ensued flew by mixed in with all the other crap warnings and I
> > did not see it. That cost me wasted cycle time (remember, I am not an expert and
> > should not be expected to see such things. Hell, for that matter I should not
> > even be doing any of this work. :)
> > 
> 
> This option is clearly enforceing someone's preferred markup of
> adding a comment to explicitly note a fall through.  Candidate
> individual to complain to
> 
> If he added a new option affecting libgfortran, then he should
> fix up libgfortran.

He didn't add the warning to specifically annoy fortran developers.
It is trivial to add seven gcc_fallthrough() or breaks for someone who
knows the code and the person who added the warning obviously doesn't.

-- 
Markus



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