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lld-linked libc++.so, libc++abi.so has undefined _GLOBAL_OFFSET_TABLE_ symbol #27079

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emaste opened this issue Feb 23, 2016 · 2 comments
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lld-linked libc++.so, libc++abi.so has undefined _GLOBAL_OFFSET_TABLE_ symbol #27079

emaste opened this issue Feb 23, 2016 · 2 comments
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bugzilla Issues migrated from bugzilla lld

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@emaste
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emaste commented Feb 23, 2016

Bugzilla Link 26705
Resolution FIXED
Resolved on Mar 15, 2016 19:39
Version unspecified
OS FreeBSD
Blocks #23588

Extended Description

linked with lld:

% nm build-lld-selfhost2/lib/libc++abi.so | grep 'GLOBAL_OFFSET'
U GLOBAL_OFFSET_TABLE

with gnu ld:

% nm build-nodebug/lib/libc++abi.so | grep 'GLOBAL_OFFSET'
00000000002592e0 a GLOBAL_OFFSET_TABLE

and link failures are observed in 'check-libcxxabi'

/usr/bin/ld: /tank/emaste/src/llvm/build-lld-selfhost2/projects/libcxxabi/test/Output/catch_pointer_reference.pass.cpp.exe: hidden symbol `GLOBAL_OFFSET_TABLE' in /usr/lib/crt1.o is referenced by DSO
/usr/bin/ld: final link failed: Nonrepresentable section on output
CC: error: linker command failed with exit code 1 (use -v to see invocation)
@llvmbot
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llvmbot commented Mar 4, 2016

I'm working on a (proper) fix, in the meanwhile you can workaround using the following:

Index: ELF/Writer.cpp

--- ELF/Writer.cpp (revision 262736)
+++ ELF/Writer.cpp (working copy)
@@ -1021,6 +1021,12 @@
if (isOutputDynamic())
Symtab.addSynthetic("_DYNAMIC", *Out::Dynamic, 0, STV_HIDDEN);

  • // If the ouput contains a GotPlt section, add
  • // GLOBAL_OFFSET_TABLE to the symbol table.
  • if (Config->Shared && Out::GotPlt)
  • Symtab.addSynthetic("GLOBAL_OFFSET_TABLE", *Out::GotPlt,
  •  Out<ELFT>::GotPlt->getSize(), STV_HIDDEN);
  • // Define __rel[a]iplt{start,end} symbols if needed.
    addRelIpltSymbols();

@emaste
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emaste commented Mar 16, 2016

Committed as r263594 http://reviews.llvm.org/rL263594

@emaste emaste mentioned this issue Apr 13, 2015
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@llvmbot llvmbot transferred this issue from llvm/llvm-bugzilla-archive Dec 10, 2021
This issue was closed.
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@emaste @llvmbot