Docs: Update README.md

[GCC]: Pass extra flags to gcc build.

There is no way to pass extra flags to gcc though
riscv-gnu-toolchain Makefile.

This is neccesary for me, because I has to rewrite gmp,
isl, mpfr, mpc folders in source of gcc project. Moreover,
I don't want to rebuild them with gcc.

Also I think, the opportunity to pass extra flags will be
convenient for many development purposes.

There is a typo in a previous commit that introduced src-dir-override
for DejaGnu.

Signed-off-by: Christoph Müllner <christoph.muellner@vrull.eu>

We have this feature for all other packages.
It is particularly useful to avoid pointless internet downloads
for automatic builds.

Signed-off-by: Christoph Müllner <christoph.muellner@vrull.eu>

Bump glibc to 2.37

glibc 2.37 has been released on February 1st, 2023.
We still use 2.33 in this repo.
Let's make a huge step forward to the latest upstream release.

Signed-off-by: Christoph Müllner <christoph.muellner@vrull.eu>

This patch contains three minor updates:
1. Added texinfo to OS X dependency package
2. Brew tap discoteq/discoteq is no longer required to install the flock
3. Added tip in "Installation (Newlib)" to keep similar to the description
   in "Installation (Linux)" and fixed a typo.

Signed-off-by: Mingzheng Xing <xingmingzheng@iscas.ac.cn>

Add a tip so blindly following the instructions is more likely to just work.  
Issue #1169 

Signed-off-by: Carl Karsten <CFKarsten@gmail.com>

Add unittest to march-to-cpu-opt

Quick fix sim pk build failure for RV32.

ubuntu20.04 make it need "clang ninja-build"

Signed-off-by: 长柳 <110147328+changliuxy@users.noreply.github.com>

Support testing zdinx/zfinx/zhinx.

https://github.com/riscv-collab/riscv-gnu-toolchain/pull/1167 has found
some bug, and I realized the testing of march-to-cpu-opt is...not well,
so spend some time to improve that a little bit, it's not complete testing,
but at least it's a start :P

Fix wrong parse script

If test --with-arch=rv32imc_zve128x
NameError: name 'arch' is not defined

Signed-off-by: Kwanghoon Son <kwangson@yahoo.com>

- We don't set correct qemu option for zdinx/zfinx/zhinx, this patch is
fixing the march-to-cpu-opt, which is a script translate -march string
to qemu options.

Enhance the testing experience

Bump qemu to 7.1.0

Signed-off-by: Christoph Müllner <christoph.muellner@vrull.eu>

musl: add missing submodule auto-initialization

Switch musl upstream URL from git:// to https://

This was the only such upstream URL and it caused issues for anyone
attempting to use it behind a proxy.

Fixes #1155.

Ubuntu 18.04 is deprecated and will be fully removed from GitHub
Actions soon (https://github.com/actions/runner-images/issues/6002

)

Signed-off-by: Florian Hofhammer <florian.hofhammer@fhofhammer.de>

Signed-off-by: Florian Hofhammer <florian.hofhammer@fhofhammer.de>

Let's document how to use the environment variable RUNTESTFLAGS
for selecting the tests that should be executed.

Signed-off-by: Christoph Müllner <christoph.muellner@vrull.eu>

Let's document how to run all the test suites in order to increase the
number of people that will execute the tests.

Signed-off-by: Christoph Müllner <christoph.muellner@vrull.eu>

Makefile.in has support for running the regression test suite of
Binutils, GCC and others. Let's add support for running glibc tests.

To run the tests the following command can be used:
  make check-glibc-linux

Tested with linux/rv64.

Signed-off-by: Christoph Müllner <christoph.muellner@vrull.eu>

This allows to specify the test cases to be run.
For example the following command can be used to restrict the testcases
that will be executed to zb*.c and sm*.c from the directory
`gcc/testsuite/gcc.target/riscv/` (which includes the file `riscv.exp`):

  RUNTESTFLAGS="riscv.exp=zb*.c\ sm*.c" make report

Signed-off-by: Christoph Müllner <christoph.muellner@vrull.eu>

docs: update AUR link on README.md

gitmodules: Fix tracking branch for GCC 12

A recent commit bumped the GCC version to 12.2,
but adjusting the tracking branch in .gitmodules was forgotten.
Let's fix this and set the tracking branch to gcc-12
(note, that there are no release branches for minor version releases).

Reported-by: Tommy Murphy <tommy_murphy@hotmail.com>
Signed-off-by: Christoph Müllner <christoph.muellner@vrull.eu>

Makefile.in: Adjust permission error message

We should not encourage people to call "sudo make".
Let's drop that recommendation in case of permission errors.

Signed-off-by: Christoph Müllner <christoph.muellner@vrull.eu>

dejagnu: Bump version to 1.6.3

GDB still defaults to 10.1 from the (already archived)
riscv-binutils-gdb repo. Let's bump the version to 12.1
and use the upstream git repo instead.

Signed-off-by: Christoph Müllner <christoph.muellner@vrull.eu>

Signed-off-by: Christoph Müllner <christoph.muellner@vrull.eu>