https://llvm.org/bugs/show_bug.cgi?id=28967
Bug ID: 28967
Summary: No relocation emitted for hidden visibility using lld
-r
Product: lld
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: ELF
Assignee: unassignedb...@nondot.org
Reporter: r...@rink.nu
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 16942
--> https://llvm.org/bugs/attachment.cgi?id=16942&action=edit
Small program to show the problem
If using lld -r to combine multiple object files, the resulting object will not
correctly reference hidden symbols (linking to such an object file will have
offset 0 inserted).
To reproduce, try the attached archive - it works with GNU LD 2.26.1 which
yields:
00000000004000b0 <_start>:
4000b0: e8 0e 00 00 00 callq 4000c3 <doit>
4000b5: 48 c7 c0 3c 00 00 00 mov $0x3c,%rax
4000bc: 48 31 ff xor %rdi,%rdi
4000bf: 0f 05 syscall
4000c1: c3 retq
00000000004000c2 <foo>:
4000c2: c3 retq
00000000004000c3 <doit>:
4000c3: 55 push %rbp
4000c4: 48 89 e5 mov %rsp,%rbp
4000c7: e8 f6 ff ff ff callq 4000c2 <foo>
4000cc: 90 nop
4000cd: 5d pop %rbp
4000ce: c3 retq
However, Clang LLD (r278597) gives:
0000000000011000 <_start>:
11000: e8 0e 00 00 00 callq 11013 <doit>
11005: 48 c7 c0 3c 00 00 00 mov $0x3c,%rax
1100c: 48 31 ff xor %rdi,%rdi
1100f: 0f 05 syscall
11011: c3 retq
0000000000011012 <foo>:
11012: c3 retq
0000000000011013 <doit>:
11013: 55 push %rbp
11014: 48 89 e5 mov %rsp,%rbp
11017: e8 e4 ef fe ff callq 0 <_start-0x11000> <-- WRONG
1101c: 90 nop
1101d: 5d pop %rbp
1101e: c3 retq
And the resulting binary crashes in the LLD-case.
This may have to do with the 'foo' symbol being marked 'l' (local) in the rel.o
file (objdump -x rel.o), but that is just my guesswork.
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