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* doc: bump sphinx.theme to v1umarcor2021-09-051-1/+1
* ci: use buildthedocs/btd to build and publish the docs to GHPumarcor2020-08-311-0/+9
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## [Next] 4.0

[![GitHub v4.0 milestone](https://img.shields.io/github/milestones/progress/ghdl/ghdl/12?style=flat-square)](https://github.com/ghdl/ghdl/milestone/12)

## [2023-03-08] 3.0

[![GitHub v3.0 milestone](https://img.shields.io/github/milestones/progress/ghdl/ghdl/11?style=flat-square)](https://github.com/ghdl/ghdl/milestone/11?closed=1)

- Handle IEEE operators for static expressions.
- Improved support of VHDL 2008 (still!).
- Start support of VHDL 2019 (`--std=19`).
- pyGHDL:
  - Experimental support to preserve VHDL code comments for documentation
	  extraction.
  - Experimental packaging with a platform-specific shared library for
	  standalone installation using PIP.
  - DOM: dependency graphs, instantiation graphs (design hierarchy),
	  file dependencies (compile order).
- Pre-releases are published to GitHub Releases and assets are uploaded to
  pre-releases and releases.

## [2023-03-06] 3.0.0-rc.4

See `3.0`.

## [2022-02-28] 2.0

[![GitHub v2.0 milestone](https://img.shields.io/github/milestones/progress/ghdl/ghdl/10?style=flat-square)](https://github.com/ghdl/ghdl/milestone/10?closed=1)

- Improvements to VHDL 2008 supports and synthesis.

## [2021-02-02] 1.0

[![GitHub v1.0 milestone](https://img.shields.io/github/milestones/progress/ghdl/ghdl/9?style=flat-square)](https://github.com/ghdl/ghdl/milestone/9?closed=1)

- Python bindings overhauled and renamed to `pyGHDL`. Three modules are included:
  `libghdl`, `lsp` and `dom`.
- Utility scripts in the codebase moved into subdir `scripts`: CI, binding
  generation, vendors, etc.
- Repository [ghdl/ghdl-cosim](https://github.com/ghdl/ghdl-cosim) created.
  It contains documentation and code examples related to VHPIDIRECT, VPI and SystemC.
- GitHub Action [ghdl/setup-ghdl-ci](https://github.com/ghdl/setup-ghdl-ci)
  created, to allow easy installation of nightly GHDL assets in GitHub Actions
  workflows.
- Main documentation site(s) moved to [ghdl.github.io/ghdl](https://ghdl.github.io/ghdl/)
  and [ghdl.github.io/ghdl-cosim](https://ghdl.github.io/ghdl-cosim/).
- Repository [ghdl/extended-tests](https://github.com/ghdl/extended-tests)
  created for testing `vendors` build scripts.
- Logo updated (org, ghdl/ghdl, ghdl/docker and ghdl/ghdl-cosim).
- Assets not added to releases or pre-releases anymore.
  Users should use package managers or nightly assets (updated after each
  successful CI run of branch `master`):
  [nightly](https://github.com/ghdl/ghdl/releases/tag/nightly).

## [2021-01-31] 1.0.0rc1

See `1.0`.

## [2020-05-21] Nightly build assets

- After each successful CI run of branch `master`, packages are published as assets of pre-release [nightly](https://github.com/ghdl/ghdl/releases/tag/nightly).
- GitHub Action [ghdl/setup-ghdl-ci](https://github.com/ghdl/setup-ghdl-ci) was created, to allow easy installation of nightly GHDL assets in GitHub Actions workflows.

## [2020-05-09] New repositories and a wiki

- The plugin for Yosys was moved from [tgingold/ghdlsynth-beta](https://github.com/tgingold/ghdlsynth-beta)
  to [ghdl/ghdl-yosys-plugin](https://github.com/ghdl/ghdl-yosys-plugin).
- Repository [ghdl/ghdl-cosim](https://github.com/ghdl/ghdl-cosim) was created.
  It contains documentation and code examples related to VHPIDIRECT, VPI and SystemC.
	See {ref}`COSIM` and [Previous work and future ideas](https://github.com/ghdl/ghdl-cosim/issues/1).
- A [Wiki](https://github.com/ghdl/ghdl/wiki) was created.
  The roadmap and ideas for documentation and internship programs were moved there.
	If you want to contribute anyhow, [have a look](https://github.com/ghdl/ghdl/wiki)!

## [2020-02-28] 0.37

[![GitHub v0.37 milestone](https://img.shields.io/github/milestones/progress/ghdl/ghdl/8?style=flat-square)](https://github.com/ghdl/ghdl/milestone/8?closed=1)

- Python binding added
- Experimental support of synthesis (either with --synth or with the Yosys plugin)
- Fixes and improved support of VHDL 2008
  - PSL keywords are directly handled in VHDL 2008
- Add support for assume.
- Last version that supports the Mentor variation of `std_logic_arith`.
  The Synopsys one is still available.

## [2019-03-03] 0.36

[![GitHub v0.36 milestone](https://img.shields.io/github/milestones/progress/ghdl/ghdl/7?style=flat-square)](https://github.com/ghdl/ghdl/milestone/7?closed=1)

- More support of unbounded arrays and records.
- Support of UVVM and VUnit.

## [2019-02-23] 0.36-rc1

See `0.36`.

## [2018-11-29] 20181129

## [2017-12-20] GitHub organization

A new GitHub organization is created and the main repo is moved from
[github.com/tgingold/ghdl](https://github.com/tgingold/ghdl) to [github.com/ghdl/ghdl](https://github.com/ghdl/ghdl).
Old refs will continue working, because permanent redirects are set up.
However, we suggest every contributor to update the remote URLs in their local clones.

## [2017-12-14] 0.35

[![GitHub v0.35 milestone](https://img.shields.io/github/milestones/progress/ghdl/ghdl/3?style=flat-square)](https://github.com/ghdl/ghdl/milestone/3?closed=1)

- Assert and report messages are sent to stdout (#394)
- Improve support for unbounded records
- Bugs fixed

## [2017-08-15] 0.34

[![GitHub v0.34 milestone](https://img.shields.io/github/milestones/progress/ghdl/ghdl/1?style=flat-square)](https://github.com/ghdl/ghdl/milestone/1?closed=1)

- Display stack backtraces on errors or assert failures
- Compile scripts for vendor libraries (Xilinx, Altera, osvvm, vunit)
- Use SSE2 for mcode backend
- mcode backend ported to `x86_64`
- Support cocotb [potentialventures/cocotb](https://github.com/potentialventures/cocotb)
- Main repository is now on github: [github.com/tgingold/ghdl](https://github.com/tgingold/ghdl)
- Docs available on rtd: [ghdl.readthedocks.org](https://ghdl.readthedocs.org/en/latest/)
- Speed improved.
- New option `--psl-report`, to report status of PSL assert and cover.
- VHDL2008: support nested package

## [2015-10-23] 0.33

- Improve support of VHDL2008
- Support [OSVVM](http://osvvm.org) 2015
- Support VUnit: [LarsAsplund/vunit](https://github.com/LarsAsplund/vunit)
- Many bugs fixed

## [2014-11-XX] 0.32

- Updated to build with `gcc-4.9.2`.
- support:
	- partial of VHDL2008 (available with `--std=08`):
	- new `std.env` package.
	- added features in `std.textio` package
	- all standard IEEE packages.
	- new operations (relation operators, maximum and minimum, unary reduction operators)
	- `boolean_vector`, `integer_vector`, `real_vector`.
	- process(all).
	- generic packages and interface package declarations.
	- block comments (aka delimited comments)
	- implicitely defined to_string functions.
	- OSVVM 2014_01
- Bugs fixed

## [2014-01-XX] 0.31

- Updated to build with `gcc-4.8.2`.
- Supports OSVVM (Open-Source VHDL Verification Methodology) (see [osvvm.org](http://osvvm.org)) in its VHDL-2002 form.
- Adds `'image` and `'value` attributes for all required datatypes
- Many bugs and support issues fixed.
- New home on `https://sourceforge.net/projects/ghdl-updates/`

## 0.30

Never released, swith to Dunoon Edition.

## [2010-01-09] 0.29

- Initial implementation of embedded PSL assertions.
- Improve:
	- speed of non-sensitized processes.
	- speed of string case statement (dichotomy instead of linear search).
- bug fix:
	- and improvements in SDF annotator.
	- when the bound of a string literal type is not locally static.
	- gcov crash

## [2009-09-17] 0.28

- Add `--std=08` to enable VHDL2008 features.
- Support all-sensitized processes from VHDL2008.
- Documentation typos (thanks to Peter Huewe).
- bug fix:
  - handle `'pos/'leftof/'rightof/'succ/'pred` in concurrent statements.
  - overloaded resolution functions.
  - direct drivers elaboration for unconstrained array signals.
  - many minor bugs.

## [2008-07-01] 0.27

- Improve SDF annotation (handles much more annotations)
- Add `--ieee-asserts=` option to control assert messages from ieee packages.
- bug fix:
  - aliases in port map
  - crash during elaboration for top entities with ports/generic
  - crash when string literal in aggregate.
  - concatenation with an array subtype element.
  - non-static subtype used by type conversions in associations.
  - clear timeout in wait for.
  - minor bugs.

## [2007-04-08] 0.26

- `GHDL_PREFIX` environment variable overrides default installation prefix.
- simulation speed improved with 'direct drivers'.
- windows version:
	- exceptions are caught
	- use executable path instead of registry for prefix
- bug fix:
	- individual association by expression (was not working)
	- individual association of string
	- within windows code generator
	- [windows] large local variables crashed
	- crash when overloaded aggregate target.
	- forbid individual association with open
	- crash when bad array prefix
	- correctly extract sensitivity of record aggregate

## [2006-08-11] 0.25

- VPI functions to schedules values.
- `math_real` now works under windows.
- documentation updated for windows.
- filename/line number displayed for range error during signal update.
- bug fix:
	- ieee math libraries available when `--ieee=synopsys`.
	- `'image` in package bodies.
	- scan of fp literals.
	- interface identifier is checked for conformance rules.
	- avoid a crash in case of error in configuration specification.
	- non-static choice in unidim case are now correctly checked.
	- do not crash in case of bad use of incomplete type.
	- `'range` are not expressions.
	- handle file declaration in concurrent procedure calls.
	- correctly handle static `'image` attribute.
	- handle in-conversion for signal associated with an expression.
	- emit an error when a function tries to exit without a return.

## [2006-06-25] 0.24

- Handle enums with more than 256 elements.
- Relax expr static rules in 93c to analyze Xilinx core lib from 8.1
- man page, `ghdl.1`, added.
- windows installer improved
- bug fix:
	- correctly handle empty file name.
	- correctly handle unused subprograms of protected types.
	- avoid a crash if unused library are used.
	- avoid crashes during error reports.
	- add a missing case array conversion.
	- build on `x86_64`.
	- code generated for conversion after mod/rem (windows version).
	- `-fexplicit` crashed with `std.standard` functions.
	- handle recursion of pure/wait checks.
	- correctly handle error cases of user attributes
	- time and character read procedure of std.textio.
	- initialize by value parameters (instead of copy-in).

## [2006-05-16] 0.23

- bug fix:
	- handle implicit conversion in resolution functions.
	- missing implicit conversion added.
	- avoid a crash in error.

## [2006-03-28] 0.22

- direntry added in `ghdl.texi`
- updated:
	- Documentation (explain bug in Xilinx unisim library).
	- to `gcc 4.1`
	- math_real
- bug fix:
	- avoid crash if type conversion is indexed/sliced
	- do not allow anymore uncomplete individual association
	- missing check on array association
	- check bounds for val attribute on enumerated type
	- array inequality of locally static expressions evaluated
	- configuration issue
	- `--warn-no-vital-generic` is now working

## [2005-12-18] 0.21

- local optimizations (loops, indexed name).
- simulation speed improved by 20% due to processes mngt optimizations.
- stack-switching code ported to `x86_64` (`amd64/em64t`).
- stack-switching code ported to `ia64`.
- `--syn-binding` option extended (see documentation).
- bug fix:
	- line number for some bound violation messages.
	- improved message error for deferred constants.
	- file parameter for functions.
	- universal real divided by integer handled in locally static expr.
	- `std_ulogic` types and arrays are known by VPI.
	- missing space added in VCDs for integers.
	- `CR+LF` is also end of line for `std.textio.readline`.
	- avoid a crash if parse error on choice.
	- handle `'image` in nested subprograms.
	- handle `'image` for floating point types.
	- do not use varargs C calls.
	- handle missing `EOL` for `readline`.
	- for `x86_64`

## 0.20 [2005-10-15]

- stack memory usage improved for shortcurt operations.
- gtkwave now displays nice waves for bit and std_ulogic signals.