On Thu, 2020-01-02 at 19:48 +0000, devel- requ...@lists.fedoraproject.org wrote: > Date: Thu, 2 Jan 2020 12:52:03 -0500 > From: Kaleb Keithley <kkeit...@redhat.com> > Subject: Re: Fedora 32 System-Wide Change proposal: GCC10 > To: Development discussions related to Fedora > <devel@lists.fedoraproject.org> > Message-ID: > <cac+jd5dxl67dafjqkq8omqx_fwwvpkzrkueexsexhhp16xh...@mail.gmail.com> > Content-Type: multipart/alternative; > boundary="0000000000006bf9f6059b2bdac6" > > --0000000000006bf9f6059b2bdac6 > Content-Type: text/plain; charset="UTF-8" > Content-Transfer-Encoding: quoted-printable > > One (the only) thing I've noticed so far about gcc-10 is that (sloppily) > defined variables in header files that lack an extern qualifier and that > don't have an explicit defn in a .c file are no longer 'common' or .comm > but are now .global .bss and cause link errors due to duplicate definitions= > . > > This very well might be because I made a mistake in the way I built gcc-10. > I'm not sure I have any way to know. > > If it's not a mistake on my part then this change has revealed a few bugs > in the other applications that I work on. > > These bugs should be fixed of course, but it's something to be aware of > when considering a major change like this, this late in the f32/rawhide > development cycle. Almost certainly a lot of other things will have similar > bugs. This is a known and desirable change in the compiler.
GCC-10 defaults to -fno-common for C which is a change relative to gcc- 9 (C++ has been -fno-common for eons, possibly forever). You really should get your sources fixed to adhere to modern C standards. This affects ~450 packages in Fedora, openSUSE and other distributions. I have already reached out to ffesti (without a response :( to get an opt-out mechanism for redhat-rpm-config that would broken packages to opt-out of this behavior. jeff _______________________________________________ devel mailing list -- devel@lists.fedoraproject.org To unsubscribe send an email to devel-le...@lists.fedoraproject.org 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@lists.fedoraproject.org
