[PATCH] D123874: [Clang][IA] support -generate-unused-section-symbols={yes|no}

[Nick Desaulniers via Phabricator via llvm-commits]

nickdesaulniers created this revision.
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GNU binutils has added support for explicitly retaining (yes option) or
dropping (no option) STT_SECTION symbols from the symbols table via
assembler option -generate-unused-section-symbols={yes|no}.

Add support to clang (`-Wa,-generate-unused-section-symbols={yes|no}`)
and llvm-mc.

This feature might be used by the Linux kernel.
https://lore.kernel.org/linux-toolchains/YllUqPK4CWZeHku8@hirez.programming.kicks-ass.net/
This has been supported by GNU binutils since 2.36.
https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=d1bcae833b32f1408485ce69f844dcd7ded093a8


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D123874

Files:
  clang/include/clang/Basic/CodeGenOptions.def
  clang/include/clang/Driver/Options.td
  clang/lib/Driver/ToolChains/Clang.cpp
  clang/test/Driver/as-options.s
  clang/test/Misc/cc1as-keep-section-symbols.s
  clang/tools/driver/cc1as_main.cpp
  llvm/include/llvm/MC/MCAsmInfo.h
  llvm/lib/MC/ELFObjectWriter.cpp
  llvm/test/MC/X86/keep-section-symbols.s
  llvm/tools/llvm-mc/llvm-mc.cpp

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