https://bugs.llvm.org/show_bug.cgi?id=34836
Bug ID: 34836
Summary: --gc-sections remove relocations from --emit-relocs
Product: lld
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: ELF
Assignee: unassignedb...@nondot.org
Reporter: thgar...@google.com
CC: llvm-bugs@lists.llvm.org, pho...@chromium.org
This bug is related to Zircon/Magenta kernel where --gc-sections is used and we
would like to use --emit-relocs to generate relocations to analyze and filter.
When using --gc-sections and --emit-relocs together, all the relocations
sections are always stripped being on the small assembly I pasted below or the
Zircon kernel. Using the binutils linker, these sections are not stripped.
Output from lld with --gc-sections + --emit-relocs and --print-gc-sections:
GCC / LLD ---
removing unused section from '.rela.text' in file './test_gcc.o'
removing unused section from '.data' in file './test_gcc.o'
removing unused section from '.bss' in file './test_gcc.o'
removing unused section from '.rela.debug_line' in file './test_gcc.o'
removing unused section from '.rela.debug_info' in file './test_gcc.o'
removing unused section from '.rela.debug_aranges' in file './test_gcc.o'
readelf -r: There are no relocations in this file.
CLANG / LLD ---
removing unused section from '.rela.text' in file './test_clang.o'
removing unused section from '.rela.debug_info' in file './test_clang.o'
removing unused section from '.rela.debug_aranges' in file './test_clang.o'
removing unused section from '.rela.debug_line' in file './test_clang.o'
readelf -r: There are no relocations in this file.
The symbol assembly file I used to test:
.global _start
.text
relocs:
.quad _start
_start:
movabs $relocs, %rax
ret
---
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