This adds a fuzzer which parses the same input using all the available implementations (haswell, westmere, fallback on x64).
This should get the otherwise uncovered sourcefiles (mostly fallback) to show up in the fuzz coverage.
For instance, the fallback directory has only one line covered.
As of the 20200909 report, 1866 lines are covered out of 4478.
Also, it will detect if the implementations behave differently:
by making sure they all succeed, or all error
turning the parsed data into text again, should produce equal results
While at it, I corrected some minor things:
clean up building too many variants, run with forced implementation (closes#815 )
always store crashes as artefacts, good in case the fuzzer finds something
return value of the fuzzer function should always be 0
reduce log spam
introduce max size for the seed corpus and the CI fuzzer
* initial oss-fuzz friendly build
parts taken from libfmt, which I wrote and have the copyright to
* fix build error
* add script for building a corpus zip
see https://google.github.io/oss-fuzz/getting-started/new-project-guide/#seed-corpus
* fix zip command
* drop setting the C++ standard
* disable the minify fuzzer, does not pass oss-fuzz check-build test
* fix integer overflow in subnormal_power10
detected by oss-fuzz
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=18714
* invoke the build like oss fuzz does
* document what the scripts are for and how to use them
* add a page about fuzzing
Paul Dreik