Re: Unikraft - Compile error on arm64

[Punit Agrawal <punitagrawal@xxxxxxxxx>]

[ Resending after correcting Jia's email. Apologies for the extra copy ]

On Sat, Sep 19, 2020 at 7:48 AM Punit Agrawal <punitagrawal@xxxxxxxxx> wrote:
>
> [ +Jia He as he seems to be looking at the arm64 port ]
>
> An update below.
>
> On Sat, Sep 12, 2020 at 8:07 PM Punit Agrawal <punitagrawal@xxxxxxxxx> wrote:
>
> [...]
>
> > It seems that using "-no-pie" causes the helpers for builtin atomics to
> > go missing on arm64. A quick hack to drop the "-no-pie" leads to
> > conflicts with "-r".
>
> Turns out this is not quite what's happening. The problem was the
> missing flags to pull in libgcc.
>
> Incidentally, pulling the latest changes on the staging branch fixed
> the issue. See eddaa9b242 ("build: Link libgcc at the end of the link
> options list"). Not sure why the commit was missing from my repo last
> week.
>
> Although it fixes the missing atomic helpers, now I get a different
> error message -
>
> /usr/bin/ld: 
> /home/punit/src/unikraft/apps/helloworld/build/helloworld_kvm-arm64.o:
> in function `init_have_lse_atomics':
> lse-init.o:(.text.startup+0xbc): undefined reference to `__getauxval'
> lse-init.o:(.text.startup+0xbc): relocation truncated to fit:
> R_AARCH64_CALL26 against undefined symbol `__getauxval'
> collect2: error: ld returned 1 exit status
> make[2]: *** [/home/punit/src/unikraft/unikraft/plat/kvm/Linker.uk:24:
> /home/punit/src/unikraft/apps/helloworld/build/helloworld_kvm-arm64.dbg]
> Error 1
> make[1]: *** [Makefile:973: sub-make] Error 2
> make[1]: Leaving directory '/home/punit/src/unikraft/unikraft'
> make: *** [Makefile:6: all] Error 2
>
> __getauxval is provided by libc but it's not being linked here. musl
> carries the symbol but is not being included in the libraries being
> linked for the "Helloworld" app.
>
> Any suggestions on how to get past this one?
>
> Thanks,
> Punit