[PATCH] D26133: [ELF] Allow relative relocations to absolute symbols in PIC

[Petr Hosek via llvm-commits]

On Thu, Dec 8, 2016 at 6:32 AM Rafael Avila de Espindola <
rafael.espindola at gmail.com> wrote:

> It is entirely possible we just have another case where lld gets
> confused about a symbol being absolute or not. Can you provide the full
> original code in musl that fails with lld?
>

I missed your response on the list. The original code that fails with lld
is pretty much equivalent to the new test case I've added:

# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t
# RUN: echo "PROVIDE_HIDDEN(_BASE = 0);" > %t.script
# RUN: ld.lld -shared --gc-sections --script %t.script -o %t1 %t
# RUN: llvm-readobj --elf-output-style=GNU --file-headers --symbols %t1 |
FileCheck %s
# CHECK: 0000000000000000     0 NOTYPE  LOCAL  HIDDEN   ABS base

.text
.globl _start
_start:
        lea _BASE(%rip),%rax

Currently, lld fails with the following error:

bin/ld.lld: error: gc-start.o:(.text.internal+0x3): relocation
R_X86_64_PC32 cannot refer to absolute symbol '_BASE' defined in (internal)
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