https://bugs.llvm.org/show_bug.cgi?id=49915
Bug ID: 49915
Summary: LLD emits corrupt version for weak symbol when using
version script
Product: lld
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: ELF
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
When linking against a lld-linked libLLVM.so with ld.bfd I got the following
error:
/usr/bin/ld: /usr/lib64/libLLVM.so: __morestack: invalid needed version 2
/usr/bin/ld: /usr/lib64/libLLVM.so: error adding symbols: bad value
clang-12.0: error: linker command failed with exit code 1 (use -v to see
invocation)
Indeed:
> readelf --wide --dyn-syms /usr/lib64/libLLVM.so.12 | grep morestack
332: 0000000000000000 0 NOTYPE WEAK DEFAULT UND __morestack@@<corrupt>
This is coming from
llvm/lib/ExecutionEngine/RuntimeDyld/RTDyldMemoryManager.cpp. I've managed to
build a small reproducer that should work with 12.0.0rc5:
> cat morestack.cpp
extern "C" __attribute__((__weak__)) void __morestack();
unsigned long f() {
return (unsigned long)&__morestack;
}
> cat script.map
LLVM_13 { global: *; };
> clang -c -fPIC -g morestack.cpp
> clang -fuse-ld=lld -shared -o test.so -Wl,--version-script,script.map
> morestack.o
> readelf --wide --dyn-syms test.so | grep __morestack
5: 0000000000000000 0 NOTYPE WEAK DEFAULT UND
__morestack@@<corrupt>
Without -fuse-ld=lld, i.e. with ld.bfd I get
2: 0000000000000000 0 NOTYPE WEAK DEFAULT UND __morestack
Now lld itself seems to fine with the corrupt version, so maybe binutils are
just overly sensitive? I don't know.
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