NOTE: This is toolchain developer facing feature.

This allow user to add extra testing multi-lib arch, it's useful when
develop and/or testing new extensions.

Usage:

--with-extra-multilib-test="arch-abi[;arch-abi]"

e.g.

linux enable enabled multilib, so default will build with follwoing
configuration:

lib32/ilp32;@march=rv32imac@mabi=ilp32
lib32/ilp32d;@march=rv32imafdc@mabi=ilp32d
lib64/lp64;@march=rv64imac@mabi=lp64
lib64/lp64d;@march=rv64imafdc@mabi=lp64d

But you want to testing more on vector stuffs like rv32gcv and rv64gcv,
then you can configure with `--with-extra-multilib-test="rv32gcv-ilp32d;rv64gcv;lp64d"`

Then the testing will run rv32imac-ilp32 rv32imafdc-ilp32d
rv64imac-lp64 rv64imafdc-lp64d and rv32gcv-ilp32d;rv64gcv;lp64d!

NOTE: Extra multilib test settings still require existing
multilib has support those extra settings, e.g. you can't add
rv32imafc_zbb-ilp32f on above example since no compatible multilib has
provided.

Fix https://github.com/riscv-collab/riscv-gnu-toolchain/issues/1282

Remove source trees after CI build to recover disk space before packaging

This reverts commit 8b47422f.

This reverts commit a8a1fd83.

Also avoid initializing subdirectories to avoid cloning
unused trees (llvm,gcc)

Generate seperate release names for LLVM and GCC toolchain release artifacts

Add newlib toolchain with llvm to ci and release

Add newlib toolchain with llvm build flow

Update readme about newlib toolchain flow

Co-authored-by: Yun Hsiang <yun.hsiang@sifive.com>

Add force flag when creating symbolic link for clang

Add permission to qemu installation

Fix yaml format

Add LLVM to build CI

Enable RISC-V LLVM & QEMU Build Flow

Bump llvm to 16.0.5

Signed-off-by: Alex Chiang <107899296+alexsifivetw@users.noreply.github.com>

Add github action ci to make-report using the spike simulator

Signed-off-by: Alex Chiang <107899296+alexsifivetw@users.noreply.github.com>

Update readme about llvm & qemu examples

Co-authored-by: Kito Cheng <kito.cheng@sifive.com>

Enable rv32gc make-report newlib and linux testing

Disable multilib ci until multilib testsuite errors are triaged

Fix #1256 - git clone pk if spike used