Messages in this thread | | | Date | Fri, 29 Sep 2017 15:58:27 -0500 | From | Josh Poimboeuf <> | Subject | Re: Problems compiling with KCFLAGS="-frecord-gcc-switches" |
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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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