[llvm-dev] Linking android with lld: aarch64 target

[Minseong Kim via llvm-dev]

On 23 March 2017 at 21:35, Peter Smith <peter.smith at linaro.org> wrote:

> Hello Min,
>
> This error message occurs when the linker would have to create a
> dynamic relocation in a read-only part of the program, which isn't
> usually allowed when making a position independent shared-library or
> position independent executable. In practice this usually means that
> one or more of the objects hasn't been compiled to be position
> independent -fPIC.
>

OK~ I will check the objects to be linked, if they are compiled (with -fPIC
or not).

It is difficult to tell much more without knowing the compiler and
> linker options. The R_AARCH64_PREL64 relocation is a relative
> relocation, this can require a dynamic relocation if the symbol it
> refers to is preemptible (i.e another definition of the symbol could
> potentially override it at load-time).
>
> Given that the file sha1-armv8.S is an assembler file, and I assume
> that the link with the same inputs works on ld.bfd and ld.gold, I can
> only think that it will either be lld is selecting a different object,
> or ld.bfd and ld.gold are resolving the R_AARCH64_PREL64 relocation in
> this case and lld is not.
>

Yes, both ld.bfd and ld.gold works with the same inputs. I will keep
looking for the cause with your suggestions in mind.

Thanks again, Peter.

cheers,
-- Min


> Peter
>
> On 23 March 2017 at 04:29, Minseong Kim via llvm-dev
> <llvm-dev at lists.llvm.org> wrote:
> > It would be great if anyone can share your thoughts about the cause and
> > possibly fix of the error below ?
> >
> > I would like to know why it is caused and how it can be fixed (if
> possible)
> > ?
> >
> > The error message is:
> >
> > ~/llvm/build/install_android/linux-x86/clang-3688880/bin/ld.lld: error:
> > external/boringssl/linux-aarch64/crypto/sha/sha1-armv8.S:1202: can't
> create
> > dynamic relocation R_AARCH64_PREL64 against symbol 'OPENSSL_armcap_P'
> > defined in
> > out/target/product/hikey/obj/STATIC_LIBRARIES/libcrypto_
> intermediates/libcrypto.a(sha1-armv8.o)
> > clang-5.0: error: linker command failed with exit code 1 (use -v to see
> > invocation)
> >
> > cheers,
> > -- Min
> >
> >
> > _______________________________________________
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> > llvm-dev at lists.llvm.org
> > http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
> >
>
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