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[Bug ld/21532] AArch64: Symbol address inconsistency across compilation
From: |
nickc at redhat dot com |
Subject: |
[Bug ld/21532] AArch64: Symbol address inconsistency across compilation units |
Date: |
Tue, 06 Jun 2017 11:34:39 +0000 |
https://sourceware.org/bugzilla/show_bug.cgi?id=21532
--- Comment #3 from Nick Clifton <nickc at redhat dot com> ---
Hi Jiong,
Thanks for taking a look at this.
> Looks like AArch64 could avoid emiting COPY relocation if it's a relocation
> against writable section. We could adopt similar code from
> elf_x86_64_adjust_dynamic_symbol or ppc64_elf_adjust_dynamic_symbol.
Ah - maybe not. The original testcase (in the BZ) shows the bug happening when
constant data is used rather than writeable data. You can also extend the
second
testcase I posted to use constant data and the same problem happens.
>> It looks like the linker creates a copy of IEEEsingle in the executable but
>> then the GOT entry for IEEEsingle is not updated in libLLVM.so, causing any
>> accesses to IEEEsingle in libLLVM.so to refer to the original definition
>
> Does this means this is a glibc bug as well? dynamic linker needs to
> redirect
> the reference in the .so to the copy as well?
This is a possibility, although I am not an expert on the dynamic linker. I
think
however that we need to verify that the static linker is producing the correct
dynamic relocations first.
Cheers
Nick
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- [Bug ld/21532] AArch64: Symbol address inconsistency across compilation units, nickc at redhat dot com, 2017/06/05
- [Bug ld/21532] AArch64: Symbol address inconsistency across compilation units, jiwang at gcc dot gnu.org, 2017/06/05
- [Bug ld/21532] AArch64: Symbol address inconsistency across compilation units, jiwang at gcc dot gnu.org, 2017/06/06
- [Bug ld/21532] AArch64: Symbol address inconsistency across compilation units,
nickc at redhat dot com <=
- [Bug ld/21532] AArch64: Symbol address inconsistency across compilation units, jiwang at gcc dot gnu.org, 2017/06/06
- [Bug ld/21532] AArch64: Symbol address inconsistency across compilation units, jiwang at gcc dot gnu.org, 2017/06/07
- [Bug ld/21532] AArch64: Symbol address inconsistency across compilation units, cvs-commit at gcc dot gnu.org, 2017/06/08
- [Bug ld/21532] AArch64: Symbol address inconsistency across compilation units, jiwang at gcc dot gnu.org, 2017/06/08
- [Bug ld/21532] AArch64: Symbol address inconsistency across compilation units, jiwang at gcc dot gnu.org, 2017/06/09
- [Bug ld/21532] AArch64: Symbol address inconsistency across compilation units, jiwang at gcc dot gnu.org, 2017/06/13
- [Bug ld/21532] AArch64: Symbol address inconsistency across compilation units, cvs-commit at gcc dot gnu.org, 2017/06/15
- [Bug ld/21532] AArch64: Symbol address inconsistency across compilation units, jiwang at gcc dot gnu.org, 2017/06/15