llvm-project/lld/test/ELF/Inputs/startstop-shared2.s

.globl __start_foo
__start_foo:
ELF: Override DSO definitions when creating __start_* and __stop_* symbols. Previously we would fail to synthesise a __start_ or __stop_ symbol if there existed a definition in a DSO. Instead, we would try to link against the DSO definition. This became possible after D23552 when linking against lld-produced DSOs but could in principle also occur when linking against DSOs produced by other linkers. Not only does it seem more likely that a user would expect the resolved definition to be local to the executable, but if a __start_ or __stop_ symbol was synthesised by the linker, it is effectively impossible to link against correctly from a non-PIC executable in a read-only section. Neither a PLT nor a copy relocation would give us the right semantics here. The only way the link could succeed is if the executable provided its own synthetic definition of the symbol. The fix is to also synthesise the definition if the only definition comes from a DSO. Since this is what the addOptionalSynthetic function does, switch to using that function. Fixes PR30680. Differential Revision: https://reviews.llvm.org/D25544 llvm-svn: 284168 2016-10-14 06:20:18 +08:00			`.globl __start_foo`
			`__start_foo:`