[all-commits] [llvm/llvm-project] 670686: Add initial support for multilibs in Baremetal too...

[abidh via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 670686ad8ecc80158a6ff87fff55e0ffa6fdff5d
      https://github.com/llvm/llvm-project/commit/670686ad8ecc80158a6ff87fff55e0ffa6fdff5d
  Author: Hafiz Abid Qadeer <abidh at codesourcery.com>
  Date:   2020-12-14 (Mon, 14 Dec 2020)

  Changed paths:
    M clang/lib/Driver/ToolChains/BareMetal.cpp
    M clang/lib/Driver/ToolChains/BareMetal.h
    M clang/test/Driver/baremetal.cpp

  Log Message:
  -----------
  Add initial support for multilibs in Baremetal toolchain.

This patch add support of riscv multilibs in the Baremetal toolchain. It is
a bit different to what is done in GNU.cpp as we are not iterating a
GNU sysroot to find the multilibs. This is intended for an llvm only
toolchain. We are not checking for the presence of any runtime bits to
enable a specific multilib.

I have structured the patch so that other targets for which
there is no multilibs support yet in Baremetal.cpp (e.g. arm-none-eabi)
will not be affected. Patch also allows some multilibs reuse.

Long term, I would like to go in the direction of data-driven specification of
multilib directories and flags.

Reviewed By: jroelofs

Differential Revision: https://reviews.llvm.org/D93138