[all-commits] [llvm/llvm-project] ca3bdb: [MC][ELF] Change SHT_LLVM_CALL_GRAPH_PROFILE reloc...

[Fangrui Song via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ca3bdb57fa1ac98b711a735de048c12b5fdd8086
      https://github.com/llvm/llvm-project/commit/ca3bdb57fa1ac98b711a735de048c12b5fdd8086
  Author: Fangrui Song <i at maskray.me>
  Date:   2021-06-24 (Thu, 24 Jun 2021)

  Changed paths:
    M lld/ELF/Driver.cpp
    M lld/ELF/InputFiles.cpp
    M lld/ELF/InputFiles.h
    M llvm/lib/MC/ELFObjectWriter.cpp
    M llvm/lib/MC/MCELFStreamer.cpp
    M llvm/test/MC/ELF/cgprofile.s
    M llvm/test/tools/llvm-readobj/ELF/call-graph-profile.test
    M llvm/test/tools/llvm-readobj/ELF/demangle.test
    M llvm/tools/llvm-readobj/ELFDumper.cpp

  Log Message:
  -----------
  [MC][ELF] Change SHT_LLVM_CALL_GRAPH_PROFILE relocations from SHT_RELA to SHT_REL

... even on targets preferring RELA. The section is only consumed by ld.lld
which can handle REL.

Follow-up to D104080 as I explained in the review. There are two advantages:

* The D104080 code only handles RELA, so arm/i386/mips32 etc may warn for -fprofile-use=/-fprofile-sample-use= usage.
* Decrease object file size for RELA targets

While here, change the relocation to relocate weights, instead of 0,1,2,3,..
I failed to catch the issue during review.