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build kernel for arm64 - linker ld ignored -z relro

Alan Modra amodra@gmail.com
Sun Sep 13 06:05:22 GMT 2020 
On Sat, Sep 12, 2020 at 06:35:58PM +0200, Milan Buška wrote:
> so 12. 9. 2020 v 8:30 odesílatel Alan Modra <amodra@gmail.com> napsal:
> >
> > On Sun, Sep 06, 2020 at 04:45:52PM +0000, Milan Buška via Binutils wrote:
> > > Hello.
> > > I'm compiling the kernel v.5.8.7 on arm64.
> > > This is a compilation in a native environment.
> > > Toolchain:
> > > glibc v. 2.32
> > > binutils v. 2.35
> > > gcc v. 10.2.0
> > >
> > > This is the last part of the output after make Image.
> > [snip]
> > >   LD .tmp_vmlinux.kallsyms1
> > > ld: warning: -z norelro ignored
> >
> > I suspect you are not configuring binutils correctly for
> > aarch64-linux.  A target of aarch64-elf for example won't give you a
> > toolchain supporting relro.
> >
> 
> I compiled binutils according to this configuration
> 
>     --prefix=/usr \
>     --build=aarch64-unknown-linux-gnu \
>     --host=aarch64-unknown-linux-gnu \
>     --with-lib-path=/usr/lib:/usr/local/lib \
>     --with-bugurl=https://github.com/archlinuxarm/PKGBUILDs/issues \
>     --enable-deterministic-archives \
>     --enable-gold \
>     --enable-ld=default \
>     --enable-lto \
>     --enable-plugins \
>     --enable-relro \
>     --enable-shared \
>     --enable-threads \
>     --disable-gdb \
>     --disable-werror \
>     --with-debuginfod \
>     --with-pic \
>     --with-system-zlib \
>     --disable-sim
> 
> Best regards
> 
> Milan Buska

Hmm, I don't see anything much wrong with that, and it looks like
archlinux doesn't make any patches to binutils that might cause the
problem you're seeing.  I suggested it might be an aarch64-elf config
because the only reasons to see "-z norelro ignored" are
GENERATE_SHLIB_SCRIPT not being "yes" or COMMONPAGESIZE not being
set.  The latter happens with an aarch64-elf toolchain.  See the
relevant ld/emulparams/ files and ld/emultempl/elf.em.

-- 
Alan Modra
Australia Development Lab, IBM
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