(original) (raw)

Is -fsplit-stack option used anywhere? My wild guess is that with ld.bfd, the thinLTO link for the DSO does not bring in morestack.o from libgcc.a, but the hidden symbol is defined in lldb binary.

David

On Mon, Oct 3, 2016 at 1:54 PM, Teresa Johnson via llvm-dev <llvm-dev@lists.llvm.org> wrote:

Aha - finally reproduced! The difference is using ld.bfd not ld.gold. With that I get the same failure (using 3.9 to build 3.9 sources):

/usr/local/google/home/tejohnson/binutils\_build/install/bin/ld: bin/lldb-3.9.1: hidden symbol \`\_\_morestack' in /usr/lib/gcc/x86\_64-linux-gnu/4.8/libgcc.a(morestack.o) is referenced by DSO

/usr/local/google/home/tejohnson/binutils\_build/install/bin/ld: final link failed: Bad value

clang-3.9: error: linker command failed with exit code 1 (use -v to see invocation)

ninja: build stopped: subcommand failed.

I am not sure what the official support story is for LLVMgold.so and ld.bfd. As mentioned earlier, the LLVM site indicates it should use the gold linker. Can you use that while I try to figure out whether this is something that should be supported/working?

Thanks,

Teresa

On Mon, Oct 3, 2016 at 9:56 AM, Carsten Mattner <carstenmattner@gmail.com> wrote:

On Mon, Oct 3, 2016 at 3:50 PM, Teresa Johnson <tejohnson@google.com> wrote:
\>
\> On Sun, Oct 2, 2016 at 4:02 AM, Carsten Mattner <carstenmattner@gmail.com> wrote:
\>>
\>> On Sun, Oct 2, 2016 at 6:41 AM, Teresa Johnson <tejohnson@google.com> wrote:
\> >
> > > I use trunk, but it depends on how close to the bleeding edge you
\> > > are comfortable with. But like I said, I also tried bootstrapping
\> > > with 3.9 (both trunk as well as 3.9 sources) and couldn't reproduce.
\>>
\>> Hmm, so you're saying neither fails for you, right?
\>
\> Yes

Okay. Do you mind focusing on the 3.9 branch? It's less of a moving target
and lends itself more to figuring out what's failing for me.

As soon as I get around to it, I'll send you my full configure and build
steps as a shell script. Need to streamline it.

--

Teresa Johnson |

Software Engineer |

tejohnson@google.com |

408-460-2413

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_
LLVM Developers mailing list
llvm-dev@lists.llvm.org
http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev