[PATCH] D148782: [RISCV] Add an option to emit the Tag_RISCV_arch attribute based on the assembler's subtarget

[Craig Topper via Phabricator via llvm-commits]

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This adds an option to emit the command line -mattr/-march into the
attributes of an object file. This can useful to get objdump to
disassemble instructions that aren't in the base without forcing
users to add a .attribute to the assembly file.

The binutils assembler does this by default.

Similar option exists for ARM. I will wire it to a clang option in
another patch. Similar to https://reviews.llvm.org/D31813


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D148782

Files:
  llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
  llvm/lib/Target/RISCV/MCTargetDesc/RISCVTargetStreamer.cpp
  llvm/lib/Target/RISCV/MCTargetDesc/RISCVTargetStreamer.h
  llvm/lib/Target/RISCV/RISCVAsmPrinter.cpp
  llvm/test/MC/RISCV/attribute.s
  llvm/test/MC/RISCV/default-build-attributes.s

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