Re: gcc 10: Default to -fno-common, multiple definitions of

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Thursday, January 23, 2020 5:30:28 PM EST Jeff Law wrote:
> On Thu, 2020-01-23 at 17:23 -0500, Steve Grubb wrote:
> > On Tuesday, January 21, 2020 1:52:54 PM EST Jeff Law wrote:
> > > > > > That was the idea.   Provide a trivial opt-out so that upstreams
> > > > > > had
> > > > > > time to fix properly.  I even volunteered to add the opt-out
> > > > > > marker
> > > > > > where appropriate to minimize the FTBFS issues.  I also
> > > > > > volunteered
> > > > > > to help with the packages that don't honor flags injection.
> > > > > 
> > > > > This sounds reasonable to me.
> > > > > 
> > > > > The PR is
> > > > > https://src.fedoraproject.org/rpms/redhat-rpm-config/pull-request/7
> > > > > 7
> > > > > 
> > > > > I have reopened it.
> > > > > 
> > > > > The mass rebuild will notify the maintainrs and they can use that
> > > > > macro
> > > > > to short-workaround the problem. It' also easier to grep from the
> > > > > specs
> > > > > than custom patches and whatnots
> > > > 
> > > > I need something like this for suricata. It has about 45 variables
> > > > causing this. And it's not a simple "extern" addition because it
> > > > looks
> > > > like in many cases the variable was never placed in a C file. Simply
> > > > adding extern keyword leads undefined reference errors. This will
> > > > take a
> > > > while to sort out with upstream.
> > > 
> > > You also have to be careful if you're building shared libraries -- I
> > > was looking at a package (I forget which) which built multiple DSOs.
> > > If you're not careful you can end up with some DSOs which wouldn't have
> > > the definition -- worse yet, you're not going to get an undefined
> > > symbol when you build those DSOs.
> > 
> > So, I have a weird one. I'm compiling audit and getting multiple
> > definitions.
> > 
> > I have
> > 
> > /usr/bin/ld: ausearch-checkpt.o:/home/sgrubb/working/BUILD/audit-3.0/src/
> > ausearch-common.h:53: multiple definition of `event_node_list';
> > ausearch.o:/
> > home/sgrubb/working/BUILD/audit-3.0/src/ausearch-common.h:53: first
> > defined here
> > 
> > $ cat ausearch-checkpt.c | grep event_node_list
> > 
> > Hmm. Nothing found.
> > 
> > $ objdump --syms ausearch-checkpt.o | grep event_node_list
> > 0000000000000040 g     O .bss	0000000000000008 event_node_list
> > 
> > It's in the object file? In ausearch-checkpt.c we have #include
> > "ausearch-
> > checkpt.h which does not define it. That file has #include
> > "ausearch-llist.h" which does not define it. That file has #include
> > "ausearch-common.h" which does define it as:
> > 
> > extern slist *event_node_list;
> > 
> > So, what appears to be happening is all these C files are creating a
> > definition based on this and they don't even use this variable. It seems
> > like they would create a spot in their table *if and only if* it was
> > referenced somewhere in the code.  I'm not sure if this was intended but
> > it will be a big problem for everyone.
> 
> Use -save-temps and post the .i file.
> 
> An "extern blah blah blah" should not be doing that.

That was very helpful. Thanks. Turns out the build testing I was doing was 
using a Fedora spec file instead of my upstream spec file which means it was 
untarring the wrong file instead of the freshly fixed file. That -save-temps 
option might help me figure out some missing definitions in suricata.

Thanks,
-Steve

_______________________________________________
devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx
To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx
Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/
List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines
List Archives: https://lists.fedoraproject.org/archives/list/devel@xxxxxxxxxxxxxxxxxxxxxxx




[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Index of Archives]     [Fedora Announce]     [Fedora Users]     [Fedora Kernel]     [Fedora Testing]     [Fedora Formulas]     [Fedora PHP Devel]     [Kernel Development]     [Fedora Legacy]     [Fedora Maintainers]     [Fedora Desktop]     [PAM]     [Red Hat Development]     [Gimp]     [Yosemite News]

  Powered by Linux