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Re: Sqlite compiler spam delenda est.

From: Gabriela Gibson <gabriela.gibson_at_gmail.com>
Date: Wed, 2 Oct 2013 10:59:34 +0100

Many thanks Julian and Alan,

for the bashism heads-up and the grep -f tip.

I'll think that this trick might be a nice addition to the build tips on
the wiki? Will this work with the various Windows Bash clones?

G

On Tue, Oct 1, 2013 at 2:16 PM, Julian Foad <julianfoad_at_btopenworld.com>wrote:

> Gabriela Gibson wrote:
>
> > Because sqlite produces ~50000 extra letters of bumpf per compile that
> often
> > obscures actually important compiler messages, I've not been as diligent
> as
> > I should have been about reading compiler messages. A lot the time I
> get lucky
> > and it doesn't matter, but I also got caught out by that.
> >
> > Here is how to get rid of all the noise and make your compiler output
> useful
> > once again:
> >
> > First we take a snapshot of the 'native' compiler messages that come
> > with the trunk:
> >
> > make 1>stdout.report 2>stderr.constant; \
> > sort --unique stderr.constant > stderr.unique | grep -v sqlite
> >
> > This removes the sqlite warnings and shows you only the current warning
> messages
> > that are actually ~/trunk related.
>
> Cool. I like tricks like this.
>
> At the end of my build script I print a slightly condensed summary of all
> the warnings that were produced, by piping the (stderr) log file content
> through the following command:
>
> grep -B1 'subversion/.*: warning:' |
> sed -e 's,/home/julianfoad/src/subversion[^/]*/,,' \
> -e "s/[]/'/g" \
> -e 's/ warning: / /'
>
> (The second sed expression replaces the curly quotes that my UK-localized
> GCC outputs with plain ASCII quote marks to make it less likely to display
> wrongly on screen.)
>
> > Any subsequent compiles that are started with the line below will use the
> > generated stderr.unique file to filter output and remove every compiler
> message
> > that is 'native' to the trunk, leaving just the messages that pertain to
> > your code:
> >
> > make > stdout.report 2> >(tee stderr.report | while read line; do echo
> > $line | grep -F -- $line" stderr.unique 2> /dev/null; if [ $? = 1 ];
> > then echo "$line" >&2; fi; done)
>
> I expect you were wondering if grep could do this by itself. It can:
>
> make > stdout.report 2> >(tee stderr.report | grep -v -F -f stderr.unique
> >&2)
>
> - Julian
>
>
> > You can also type this line when you invoke the emacs compile buffer and
> your
> > C-x ` will continue to work.
>
Received on 2013-10-02 12:00:19 CEST

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