[opus] Add CMake build instructions to README

[Marcus Asteborg]

________________________________
From: Mark Harris <mark.hsj at gmail.com>
Sent: Wednesday, June 24, 2020 00:09
To: Marcus Asteborg <xnorpx at outlook.com>
Cc: opus at xiph.org <opus at xiph.org>
Subject: Re: Add CMake build instructions to README

> Hi Marcus,

> Currently the build instructions start with simple instructions for
> building from the release tarball, and then provide more complex
> alternative instructions that can be followed for those that need to
> build the latest development code from git.  This adds instructions
> for building with CMake, but not from the normal release tarball as
> expected; instead the CMake instructions are a variation of the
> alternative instructions for building from git.

> If there is a reason that CMake should only be used with git then that
> should be explained in the instructions; otherwise I would expect the
> instructions to apply to the normal release tarball.  It's not clear
> whether there is also a need for a fourth set of build instructions
> for using CMake in combination with git, unless there is something
> particularly notable about that combination.  Perhaps that might be
> covered just for Windows, as an addendum to the existing git
> instructions, since the existing git instructions specifically cover
> several platforms, but not Windows.

> - Mark

Hi Mark,

CMake works fine to build from release tarball and git.
One do need to install compiler + cmake to configure and build.
The only reason I added it to the git instructions was that CMake is a clear dependency
that needs to be installed on the system.

---------------

To build from a distribution tarball, you only need to do the following:

    % ./configure
    % make

To build from the git repository, the following steps are necessary:

-------------


I am not so familiar with automake and nix systems.

Does the configure install make and compilers that is needed for the make step?

Or is it assumed that the nix system already has it installed?


I like the idea to strip down to just use windows as CMake example.

Se let me iterate on the instructions and strip it down for Windows only.


//Marcus

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