Need help reducing gcc compiler warnings in BSD

Matthew Dillon dillon at
Sat Jul 11 23:44:32 PDT 2015

Well, the boot code is a bit of a crap-shoot, because a lot of it is
related to working around bugs in various BIOSes rather than actual bug
fixes in the boot code itself.   Changes can sometimes break one platform
while fixing another.  So wholesale copying of boot work in either
direction without a huge amount of testing will meet with a great deal of


On Sat, Jul 11, 2015 at 7:29 PM, Craig Rodrigues <rodrigc at>

> Hi,
> Yes, I agree that formal collaboration is overkill for this stuff, but I
> thought I would inform
> the DragonFlyBSD community, because I have been benefiting by taking good
> fixes
> done to the DragonFlyBSD tree.  One advantage of the Jenkins build is that
> it enumerates
> the compiler warnings in a table, so it is easy to track over time if
> compiler warnings increase or decrease
> as code changes are made, so DragonFlyBSD users can monitor that if they
> wish.
> One item I could use help with is that gcc 4.9 compiles FreeBSD's
> i386/boot2 to
> greater than 8192 bytes, so it is unusable:
> I see that DragonFlyBSD has changed a lot of the boot code compared to
> FreeBSD.
> I'm not familiar with all the changes.  Are there fixes done in this area
> for DragonFlyBSD
> that could be pushed back to FreeBSD?
> --
> Craig
> On Fri, Jul 10, 2015 at 3:56 PM, Matthew Dillon <dillon at>
> wrote:
>> I'm not sure the work load is high enough to require a formal
>> collaboration.  We just fix things as they come up for the most part.
>> Sascha has been doing WARNS related cleanups on the codebase and slowly
>> bumping up the WARNS level for various parts of the build for years, which
>> reduces problems going forwards.  It's mostly a matter of being proactive
>> about it.
>> -Matt
>> On Fri, Jul 10, 2015 at 7:52 AM, Craig Rodrigues <rodrigc at>
>> wrote:
>>> Hi,
>>> I set up this Jenkins job which builds FreeBSD with gcc 4.9, and reports
>>> all the compiler warnings here:
>>> I have been working with other people like Marcelo Araujo to
>>> reduce the gcc compiler warnings on FreeBSD, even though
>>> the default system compiler for FreeBSD is clang.
>>> I have noticed that a lot of fixes to the problems have been down
>>> in DragonFlyBSD.  I have imported some of these fixes, especially ones
>>> done by
>>> Sascha Wildner, such as this one:
>>> Is there a way that we can collaborate across the FreeBSD and
>>> DragonFlyBSD
>>> projects to reduce gcc compiler warnings?  That it would be quite nice.
>>> It would make code easier to share, and improve the code overall.
>>> Thanks.
>>> --
>>> Craig
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