update README (#1105)

1 files changed, 18 insertions, 27 deletions

diff --git a/README.md b/README.md
index 2ff4076c8..749ef774f 100644
--- a/README.md
+++ b/README.md
@@ -1,25 +1,27 @@
-
-> **2017-12-20: the main repo was moved from [github.com/tgingold/ghdl](https://github.com/tgingold/ghdl) to [github.com/ghdl/ghdl](https://github.com/ghdl/ghdl). Old refs still work, because permanent redirects were set up. However, it is suggested to update the remote URLs in the local clones of every contributor. See
-[Changing a remote's URL](https://help.github.com/articles/changing-a-remote-s-url/).**
+<p align="center">
+  <a title="Read the Docs" href="http://ghdl.readthedocs.io"><img src="https://img.shields.io/readthedocs/ghdl.svg?longCache=true&style=flat-square&logo=read-the-docs&logoColor=e8ecef"></a><!--
+  -->
+  <a title="Join the chat at https://gitter.im/ghdl1/Lobby" href="https://gitter.im/ghdl1/Lobby?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge"><img src="https://img.shields.io/badge/chat-on%20gitter-4db797.svg?longCache=true&style=flat-square&logo=gitter&logoColor=e8ecef"></a><!--
+  -->
+  <a title="Docker Images" href="https://github.com/ghdl/docker"><img src="https://img.shields.io/docker/pulls/ghdl/ghdl.svg?logo=docker&logoColor=e8ecef&style=flat-square&label=docker"></a><!--
+  -->
+  <a title="Releases" href="https://github.com/ghdl/ghdl/releases"><img src="https://img.shields.io/github/commits-since/ghdl/ghdl/latest.svg?longCache=true&style=flat-square"></a>
+</p>
 
 <p align="center">
   <img src="./logo.png"/>
 </p>
 
 <p align="center">
-  <a title="Read the Docs" href="http://ghdl.readthedocs.io"><img src="https://img.shields.io/readthedocs/ghdl.svg?longCache=true&style=flat-square&logo=read-the-docs&logoColor=e8ecef"></a><!--
-  -->
-  <a title="Join the chat at https://gitter.im/ghdl1/Lobby" href="https://gitter.im/ghdl1/Lobby?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge"><img src="https://img.shields.io/badge/chat-on%20gitter-4db797.svg?longCache=true&style=flat-square&logo=gitter&logoColor=e8ecef"></a><!--
-  -->
   <a title="CII Best Practices" href="https://bestpractices.coreinfrastructure.org/en/projects/3157"><img src="https://img.shields.io/cii/percentage/3157??longCache=true&style=flat-square"></a><!--
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-  <a title="Linux/Mac boxes at Travis-CI" href="https://travis-ci.org/ghdl/ghdl/branches"><img src="https://img.shields.io/travis/ghdl/ghdl/master.svg?longCache=true&style=flat-square&logo=travis-ci&logoColor=e8ecef"></a><!--
+  <a title="'doc' workflow Status" href="https://github.com/ghdl/ghdl/actions?query=workflow%3Adoc"><img alt="'cache' workflow Status" src="https://img.shields.io/github/workflow/status/ghdl/ghdl/doc?longCache=true&style=flat-square&label=cache&logo=github"></a><!--
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-  <a title="AppVeyor branch" href="https://ci.appveyor.com/project/tgingold/ghdl-psgys/history"><img src="https://img.shields.io/appveyor/ci/tgingold/ghdl-psgys/master.svg?logo=appveyor&logoColor=e8ecef&style=flat-square"></a><!--
+  <a title="'push' workflow Status" href="https://github.com/ghdl/ghdl/actions?query=workflow%3Apush"><img alt="'push' workflow Status" src="https://img.shields.io/github/workflow/status/ghdl/ghdl/push?longCache=true&style=flat-square&label=push&logo=github"></a><!--
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-  <a title="Docker Images" href="https://github.com/ghdl/docker"><img src="https://img.shields.io/docker/pulls/ghdl/ghdl.svg?logo=docker&logoColor=e8ecef&style=flat-square&label=docker"></a><!--
+  <a title="Linux/Mac boxes at Travis-CI" href="https://travis-ci.org/ghdl/ghdl/branches"><img src="https://img.shields.io/travis/ghdl/ghdl/master.svg?longCache=true&style=flat-square&logo=travis-ci&logoColor=e8ecef"></a><!--
   -->
-  <a title="Releases" href="https://github.com/ghdl/ghdl/releases"><img src="https://img.shields.io/github/commits-since/ghdl/ghdl/latest.svg?longCache=true&style=flat-square"></a>
+  <a title="AppVeyor branch" href="https://ci.appveyor.com/project/tgingold/ghdl-psgys/history"><img src="https://img.shields.io/appveyor/ci/tgingold/ghdl-psgys/master.svg?logo=appveyor&logoColor=e8ecef&style=flat-square"></a>
 </p>
 
 This directory contains the sources of GHDL, the open-source analyzer, compiler and simulator for [VHDL](https://en.wikipedia.org/wiki/VHDL), a Hardware Description Language ([HDL](https://en.wikipedia.org/wiki/Hardware_description_language)). GHDL is not an interpreter: it allows you to analyse and elaborate sources to generate machine code from your design. Native program execution is the only way for high speed simulation.
@@ -41,7 +43,7 @@ Supported third party projects: [VUnit](https://vunit.github.io), [UVVM](https:/
 GHDL is free software:
 
 - [![GNU General Public License 2](https://img.shields.io/badge/code%20license-GPLv2-bd0000.svg?longCache=true&style=flat-square&label=license&logo=gnu)](https://github.com/ghdl/ghdl/blob/master/COPYING.md)
-- [![Creative Commons Attribution-ShareAlike](https://img.shields.io/badge/doc%20license-Creative%20Commons%20Attribution--ShareAlike--4.0-aab2ab.svg?longCache=true&style=flat-square)](https://github.com/ghdl/ghdl/blob/master/doc/COPYING_DOC.md) available at [ghdl.readthedocs.io](https://ghdl.readthedocs.io).
+- [![Creative Commons Attribution-ShareAlike](https://img.shields.io/badge/doc%20license-Creative%20Commons%20Attribution--ShareAlike--4.0-bf7600.svg?longCache=true&style=flat-square&logo=Creative%20Commons)](https://github.com/ghdl/ghdl/blob/master/doc/COPYING_DOC.md) available at [ghdl.rtfd.io](https://ghdl.readthedocs.io).
 - Some of the runtime libraries, are under different terms; see the individual source files for details.
 
 # Getting GHDL
@@ -52,23 +54,13 @@ Periodically (not regularly), several binary distributions are made available th
 
 ## Building GHDL
 
-GHDL currently supports three different back-ends (code generators). Each has its pros and cons. Here is a short comparison:
-
-| | pros | cons | observations |
-|---|---|---|---|
-|mcode | very easy to build | x86_64/i386 only | no executable created from your design |
-| | very quick analysis time and can analyze very big designs | simulation is slower | |
-| GCC | generated code is faster | analyze can take time (particularly for big units) | the output is an executable |
-| | generated code can be debugged | build is more complex |
-| | many platforms (x86, x86_64, powerpc, sparc) | |
-
-LLVM has the same pros/cons as GCC, but it is easier to build. However, coverage (`gcov`) is unique to GCC.
-
-You can find specific instructions for each of the options in '[Building](https://ghdl.rtfd.io/en/latest/getting/)'.
+GHDL currently supports three different back-ends (code generators). Each has its pros and cons. You can find specific instructions for each of the options in '[Building](https://ghdl.rtfd.io/en/latest/getting/)'.
 
 ### TL;DR
 
-In order to follow the traditional way to `configure` and `make`, you need the an Ada compiler. Most GNU/Linux package managers provide a package named `gcc-ada` or `gcc-gnat`. Alternatively, GNAT GPL can be downloaded anonymously from [libre.adacore.com](http://libre.adacore.com/tools/gnat-gpl-edition/) (2014, or later; for x86, 32 or 64 bits). Then, untar and run the *doinstall* script.
+In order to follow the traditional way to `configure` and `make`, you need the an Ada compiler. Most GNU/Linux package managers provide a package named `gcc-ada` or `gcc-gnat`.
+
+> Alternatively, GNAT GPL can be downloaded anonymously from [libre.adacore.com](http://libre.adacore.com/tools/gnat-gpl-edition/) (later than 2017 is suggested; for x86, 32 or 64 bits). Then, untar and run the *doinstall* script.
 
 > Depending on the OS and distribution you are using, you will also need to install some toolchain dependencies, such as `zlib`. See '[Building](https://ghdl.rtfd.io/en/latest/getting/)' for specific package names.
 
@@ -99,7 +91,6 @@ That's all!
 
 - [vscode-client](https://github.com/ghdl/ghdl-language-server/tree/master/vscode-client) is an extension for [Visual Studio Code (VSC)](https://code.visualstudio.com/) to provide language support for VHDL by interfacing `ghdl-ls`.
 
-
 ## Advanced users
 
 - `libghdl` is a shared library that includes a subset of the regular features plus some features to be used by extension tools (i.e. `libghdl-py`). This is built along with the regular GHDL and it supports both non-synthesisable and synthesisable code. Nonetheless, this is not for users, but for tools built on top of the core. When configured along with `--enable-synth`, this shared library includes **[experimental]** synthesis features too.