Re: unit test failures (llvm/clang/scan-build/clang/clang++)

On 11/23/2015 11:14 AM, Maarten Hoes wrote:
> On Mon, Nov 23, 2015 at 11:09 AM, Stephan Bergmann <sbergman@redhat.com
> <mailto:sbergman@redhat.com>> wrote:
>  >
>  > On 11/23/2015 11:02 AM, Maarten Hoes wrote:
>  >>
>  >> On Mon, Nov 23, 2015 at 10:51 AM, Stephan Bergmann
> <sbergman@redhat.com <mailto:sbergman@redhat.com>
>  >> <mailto:sbergman@redhat.com <mailto:sbergman@redhat.com>>> wrote:
>  >>  >
>  >>  > On 11/23/2015 10:42 AM, Maarten Hoes wrote:
>  >>  >>
>  >>  >> On Mon, Nov 23, 2015 at 10:39 AM, Stephan Bergmann
>  >> <sbergman@redhat.com <mailto:sbergman@redhat.com>
> <mailto:sbergman@redhat.com <mailto:sbergman@redhat.com>>
>  >>  >>  > The Clang included in Fedora 23 is known to be broken,
>  >>  >> <https://bugzilla.redhat.com/show_bug.cgi?id=1282645#c3> "Clang
> fails to
>  >>  >> link boost library."
>  >>  >>
>  >>  >> Instead of using the pre-build binaries/packages of Fedora, I
> build from
>  >>  >> source. Of course, that doesnt mean it couldnt still be broken ;-)
>  >>  >
>  >>  >
>  >>  > See my recipe in the "By the way" paragraph in the bug I linked.
>  >>
>  >> Thanks. So that works around the clang bug, only to uncover a bug in the
>  >> Fedora 23 GNU libstdc++ ? Looks like Im screwed.
>  >
>  >
>  > Note that the libstdc++ issue is in debug-mode--only code, so LO is
> only affected (and the little additional patch I presented to fix things
> up only needed) with --enable-dbgutil.
>  >
> Ah. And, perhaps, affected with '--enable-debug' ? Im using that. So
> just omitting '--enable-debug' should make the clang build succeed ? Or
> am I (once again) missing the point here ?

No, not affected by --enable-debug.

And the 'add the patch <http://reviews.llvm.org/D12834?id=34645> "add 
gcc abi_tag support'" part of the recipe is required independent of LO 
--enable-dbgutil, only the "plus a little patch..." part can presumably 
be ignored in the (implicit) --disable-dbgutil case.

(There may also be other ways how to make Clang on Fedora 23 work, like 
overriding libstdc++'s _GLIBCXX_USE_CXX11_ABI setting, but I haven't 
explored that.)