[lldb-dev] Linker error on fresh working copy

[Arnaud A. de Grandmaison]

On 11/22/2013 07:56 AM, Félix Cloutier wrote:
> Hello people,
>
> I got the lldb source fresh from SVN, and even after doing the little
> Python dance for Mavericks (setting SDKROOT to macosx10.8 like Jason
> Molenda suggested yesterday), I still get compile errors. The linker
> bails out with this when it tries to link lldb-platform:
>
> Undefined symbols for architecture x86_64:
>   "llvm::SmallPtrSetImpl::SmallPtrSetImpl(void const**, unsigned int,
> llvm::SmallPtrSetImpl&&)", referenced from:
>       llvm::SmallPtrSet<DWARFDebugInfoEntry const*,
> 4u>::SmallPtrSet(llvm::SmallPtrSet<DWARFDebugInfoEntry const*, 4u>&&)
> in liblldb-core.a(SymbolFileDWARF.o)
> ld: symbol(s) not found for architecture x86_64
> clang: error: linker command failed with exit code 1 (use -v to see
> invocation)
>
> Looking deeper, I found that it is declared like that:
>
> #if LLVM_HAS_RVALUE_REFERENCES
>   SmallPtrSetImpl(const void **SmallStorage, unsigned SmallSize,
>                   SmallPtrSetImpl &&that);
> #endif
>
> Could it be that llvm is built without LLVM_HAS_RVALUE_REFERENCES but
> lldb is built with it?
>

Hi Felix,

I also got this problem. It comes from the fact that lldb is built in
c++11 mode (required), whereas your llvm codebase is built without. You
should compile llvm in c++11 as well, or some functions will simply not
be in the libraries.

If your are using cmake, I submitted (but diid not commit) a patch to
optionally enable c++11 building with cmake a few hours ago on the
llvm-commit list. For an autoconf build, there is an --enable-cxx11 to
configure.

Cheers,
--
Arnaud

> Félix
>
>
> _______________________________________________
> lldb-dev mailing list
> lldb-dev at cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/lldb-dev


-- 
Arnaud A. de Grandmaison

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