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[LLD][ELF] Error if _GLOBAL_OFFSET_TABLE_ is defined in input objects The _GLOBAL_OFFSET_TABLE_ is a linker defined symbol that is placed at some location relative to the .got, .got.plt or .toc section. On some targets such as Arm the correctness of some code sequences using a relocation to _GLOBAL_OFFSET_TABLE_ depend on the value of the symbol being in the linker defined place. Follow the ld.gold example and give a multiple symbol definition error. The ld.bfd behaviour is to ignore the definition in the input object and redefine it, which seems like it could be more surprising. fixes pr39587 Differential Revision: https://reviews.llvm.org/D54624 llvm-svn: 347854
2018-11-29 19:18:07 +08:00
# REQUIRES: x86
# RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t.o
[ELF][test] Change -o %t to -o /dev/null if the output is not needed
2020-02-13 13:48:45 +08:00
# RUN: not ld.lld -shared %t.o -o /dev/null 2>&1 | FileCheck %s
[LLD][ELF] Error if _GLOBAL_OFFSET_TABLE_ is defined in input objects The _GLOBAL_OFFSET_TABLE_ is a linker defined symbol that is placed at some location relative to the .got, .got.plt or .toc section. On some targets such as Arm the correctness of some code sequences using a relocation to _GLOBAL_OFFSET_TABLE_ depend on the value of the symbol being in the linker defined place. Follow the ld.gold example and give a multiple symbol definition error. The ld.bfd behaviour is to ignore the definition in the input object and redefine it, which seems like it could be more surprising. fixes pr39587 Differential Revision: https://reviews.llvm.org/D54624 llvm-svn: 347854
2018-11-29 19:18:07 +08:00
# On some targets the location of the _GLOBAL_OFFSET_TABLE_ symbol table can
# matter for the correctness of some relocations. Follow the example of ld.gold
# and give a multiple definition error if input objects attempt to redefine it.
# CHECK: ld.lld: error: {{.*o}} cannot redefine linker defined symbol '_GLOBAL_OFFSET_TABLE_'
.data
.global _GLOBAL_OFFSET_TABLE_
_GLOBAL_OFFSET_TABLE_:
.word 0