On Fri 2016-08-12 13:22:21 -0400, Santiago Vila wrote:
> On Mon, 27 Jun 2016, Daniel Kahn Gillmor wrote:
>> I think clang introduced -fdebug-prefix-map in 3.8.0 (see
>> https://bugs.debian.org/819185) and afl build-depends on clang-3.7.
>>
>> I assume that it's the reproducible-builds toolchain that's adding the
>> -fdebug-prefix-map option to CFLAGS, right? That's good -- it should
>> help avoid variations in the generated binaries due to build path alone,
>> so please keep it! seems like the right fix here is either to build afl
>> against a newer version of clang, or to resolve #819185 by backporting
>> the option to clang-3.7.
>
> Actually, it's dpkg-buildflags who's adding -fdebug-prefix-map.
>
> So this bug was not really blocked by 819185. afl could well drop such
> option from CFLAGS and friends, regardless of clang version used.
Sure, but we don't want that option dropped -- we want reproducible
outputs regardless of the build path. It'd be better to fix the
toolchain (or to use a toolchain that's already fixed) than to mask the
option and make sks unreproducible when the build path varies.
--dkg
