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Re: Sqlite compiler spam delenda est.

From: Julian Foad <julianfoad_at_btopenworld.com>
Date: Tue, 1 Oct 2013 14:16:05 +0100 (BST)

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 2013-10-01 15:16:48 CEST

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