[PATCH] D97916: [Driver][RISCV] Support parsing multi-lib config from GCC.

[Kito Cheng via Phabricator via cfe-commits]

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RISC-V is highly configurable architecture, so it's hard to list all
possible multi-lib here, in order to deal with that issue , GCC has support
a flexible way to configure the multi-lib[1] for bare-matel toolchain.

So I think it would be great to just leverage that from GCC, the
simplest way is asking the multi-lib configuration from GCC.

[1] https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=c1e6691245ca2f1f329549f323f67afe32bcb97a


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D97916

Files:
  clang/include/clang/Basic/DiagnosticDriverKinds.td
  clang/include/clang/Basic/DiagnosticGroups.td
  clang/lib/Driver/ToolChains/Arch/RISCV.cpp
  clang/lib/Driver/ToolChains/Arch/RISCV.h
  clang/lib/Driver/ToolChains/Gnu.cpp
  clang/lib/Driver/ToolChains/Gnu.h
  clang/test/Driver/Inputs/multilib_riscv32_elf_sdk/bin/riscv32-unknown-elf-gcc
  clang/test/Driver/Inputs/multilib_riscv32_elf_sdk/lib/gcc/riscv32-unknown-elf/8.2.0/crtbegin.o
  clang/test/Driver/Inputs/multilib_riscv32_elf_sdk/lib/gcc/riscv32-unknown-elf/8.2.0/crtend.o
  clang/test/Driver/Inputs/multilib_riscv32_elf_sdk/lib/gcc/riscv32-unknown-elf/8.2.0/rv32iac/ilp32/crtbegin.o
  clang/test/Driver/Inputs/multilib_riscv32_elf_sdk/lib/gcc/riscv32-unknown-elf/8.2.0/rv32iac/ilp32/crtend.o
  clang/test/Driver/Inputs/multilib_riscv32_elf_sdk/lib/gcc/riscv32-unknown-elf/8.2.0/rv32imafc/ilp32f/crtbegin.o
  clang/test/Driver/Inputs/multilib_riscv32_elf_sdk/lib/gcc/riscv32-unknown-elf/8.2.0/rv32imafc/ilp32f/crtend.o
  clang/test/Driver/Inputs/multilib_riscv32_elf_sdk/lib/gcc/riscv32-unknown-elf/8.2.0/rv64imafdc/lp64d/crtbegin.o
  clang/test/Driver/Inputs/multilib_riscv32_elf_sdk/lib/gcc/riscv32-unknown-elf/8.2.0/rv64imafdc/lp64d/crtend.o
  clang/test/Driver/Inputs/multilib_riscv32_elf_sdk/riscv32-unknown-elf/lib/crt0.o
  clang/test/Driver/Inputs/multilib_riscv32_elf_sdk/riscv32-unknown-elf/lib/rv32iac/ilp32/crt0.o
  clang/test/Driver/Inputs/multilib_riscv32_elf_sdk/riscv32-unknown-elf/lib/rv32imafc/ilp32f/crt0.o
  clang/test/Driver/Inputs/multilib_riscv32_elf_sdk/riscv32-unknown-elf/lib/rv64imac/lp64/crt0.o
  clang/test/Driver/Inputs/multilib_riscv64_elf_sdk/bin/riscv64-unknown-elf-gcc
  clang/test/Driver/Inputs/multilib_riscv64_elf_sdk/lib/gcc/riscv64-unknown-elf/8.2.0/crtbegin.o
  clang/test/Driver/Inputs/multilib_riscv64_elf_sdk/lib/gcc/riscv64-unknown-elf/8.2.0/crtend.o
  clang/test/Driver/Inputs/multilib_riscv64_elf_sdk/lib/gcc/riscv64-unknown-elf/8.2.0/rv32iac/ilp32/crtbegin.o
  clang/test/Driver/Inputs/multilib_riscv64_elf_sdk/lib/gcc/riscv64-unknown-elf/8.2.0/rv32iac/ilp32/crtend.o
  clang/test/Driver/Inputs/multilib_riscv64_elf_sdk/lib/gcc/riscv64-unknown-elf/8.2.0/rv32imafc/ilp32f/crtbegin.o
  clang/test/Driver/Inputs/multilib_riscv64_elf_sdk/lib/gcc/riscv64-unknown-elf/8.2.0/rv32imafc/ilp32f/crtend.o
  clang/test/Driver/Inputs/multilib_riscv64_elf_sdk/lib/gcc/riscv64-unknown-elf/8.2.0/rv64imafdc/lp64d/crtbegin.o
  clang/test/Driver/Inputs/multilib_riscv64_elf_sdk/lib/gcc/riscv64-unknown-elf/8.2.0/rv64imafdc/lp64d/crtend.o
  clang/test/Driver/Inputs/multilib_riscv64_elf_sdk/riscv64-unknown-elf/lib/crt0.o
  clang/test/Driver/Inputs/multilib_riscv64_elf_sdk/riscv64-unknown-elf/lib/rv32iac/ilp32/crt0.o
  clang/test/Driver/Inputs/multilib_riscv64_elf_sdk/riscv64-unknown-elf/lib/rv32imafc/ilp32f/crt0.o
  clang/test/Driver/Inputs/multilib_riscv64_elf_sdk/riscv64-unknown-elf/lib/rv64imac/lp64/crt0.o
  clang/test/Driver/Inputs/multilib_riscv64_elf_sdk_bad/bin/riscv64-unknown-elf-gcc
  clang/test/Driver/riscv32-toolchain.c
  clang/test/Driver/riscv64-toolchain.c

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