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SubjectRe: Problems compiling with KCFLAGS="-frecord-gcc-switches"
On Fri, Sep 29, 2017 at 01:38:43PM -0700, Guenter Roeck wrote:
> On Fri, Sep 29, 2017 at 01:00:56PM -0700, Guenter Roeck wrote:
> > Hi Josh,
> >
> > when trying to compile an image with KCFLAGS="-frecord-gcc-switches",
> > I get the folllowing build warning/error.
> >
> > make allmodconfig
> > KCFLAGS="-frecord-gcc-switches" make arch/x86/kvm/emulate.o
> > ./tools/objtool/objtool check --no-unreachable "arch/x86/kvm/emulate.o"
> >
> > arch/x86/kvm/emulate.o: warning:
> > objtool: .GCC.command.line+0x0: special: can't find new instruction
> >
> > Building a full image aborts with:
> >
> > WARNING: arch/x86/kvm/kvm.o(__ex_table+0x4c): Section mismatch in reference
> > from the (unknown reference) (unknown)
> > to the variable .GCC.command.line:kvm_fastop_exception
> > FATAL: The relocation at __ex_table+0x4c references
> > section ".GCC.command.line" which is not executable, IOW
> > the kernel will fault if it ever tries to
> > jump to it. Something is seriously wrong
> > and should be fixed.
> > make[2]: *** [arch/x86/kvm/kvm.o] Error 1
> >
> > Any idea what might cause this problem ?
> >
>
> Here is another interesting problem, seen when building arm64 allmodconfig
> -CONFIG_CPU_BIG_ENDIAN +CONFIG_EFI.
>
> kallsyms failure:
> relative symbol value 0xffffff9008073000 out of range in relative mode
>
> This is due to symbols such as
>
> 000000000000000e n __efistub_$d
>
> in the symbol table. Those are not filtered out by kallsyms, resulting in a
> relative "base" address of 0x0e, and all other symbols are out of range.
> Those symbols are only generated in efi/libstubs.
>
> Any idea what might be going on there, and how to fix it ?
> An easy fix would be something like
>
> - else if (stype == 'N')
> + else if (toupper(stype) == 'N')
>
> in kallsyms, but that doesn't seem like a clean solution to me.

Not sure... What does 'n' mean? I don't see it in the man page for nm.

--
Josh

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