**1.0-dev** (XXXX-XX-XX) **0.37** (2020-02-28) - 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. **0.36** (2019-03-03) - 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. - Add support for unbounded arrays. **0.35** (2017-12-14) - Assert and report messages are sent to stdout (#394) - Improve support for unbounded records - Bugs fixed **0.34** (2017-08-15) - 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 **0.33** (2015-10-04) - Improve support of VHDL2008 - Support [OSVVM](http://osvvm.org) 2015 - Support VUnit: [LarsAsplund/vunit](https://github.com/LarsAsplund/vunit) - Many bugs fixed **0.32** (2014-11-XX) - 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 **0.31** (2014-01-XX) - 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. **0.29** (2010-01-09) - 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 **0.28** (2009-09-17) - 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. **0.27** (2008-07-01) - 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. **0.26** (2007-04-08) - `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 **0.25** (2006-08-11) - 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. **0.24** (2006-06-25) - 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). **0.23** (2006-05-16) - bug fix: - handle implicit conversion in resolution functions. - missing implicit conversion added. - avoid a crash in error. **0.22** (2006-03-28) - 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 **0.21** (2005-12-18) - 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. - time unit is displayed in assert/report message. - `-fexplicit` option added. - integers are now written in VCD files. - hash table added for design_units (speed optimization). - range checks slightly optimized. - `--vcdz` run time option added. - improved error message for invalid expressions. - grt now compiles with GNAT-GPL-2005 (use a GNAT bug work-around). - bug fix: - handle more types for `--dump-rti` and `--wave`. - `'last_event` and `'last_active` (bad value returned when no previous event or activity). - `'image` attribute for physical types (was bad unit). - `'image` attribute for locally static integers. - for reading `.ghw` files. - in `--xref`. **0.19** (2005-08-17) - `ADAFLAGS` has been replaced by `GHDL_ADAFLAGS` to ease compilation. - `ieee.math_real` and `ieee.math_complex` added (only partially, based on a draft). - current time is printed with assert/report messages. - stack switch assembly code ported to powerpc-linux. - documentation on how to use grt from Ada added. - allow indexes of indexed names to be non-static in case statements (93c only) (this is not standard, but I can't see why it should be required). - unbound ports of entities are now reported with `--warn-binding`. - some error or warning messages improved. - `--wave` option added to dump waveforms (using ghw file format). - bug fix: - internal error (missing close_temp for implicit read) - `--xref-html`: avoid to reanalyze unit. - handle implicit conversion for `'image`. - aggregate assigned to an aggregate: avoid crash. - array attributes on unconstrained array: avoid crash. - `'last_event` returns `time'high` if no event. - `'last_event` on array (uninitialized variable). - allow calling `rising_edge` with a port of mode buffer. - allow aliases of unconstrained arrays. - bound error on aggregate with an unused other association. - catch indexed/sliced component (was crashing). - catch index/slice of a type conversion (was crashing). - handle bad component specification in conf (was crashing). - missing ports in component (was crashing). - component configurations were dicarded by bug in some cases. - no more unused warnings for subprograms in architectures (they may be used in configuration). - allow conversion in component configuration. - conversion in associations with not statically defined array signals. **0.18** (2005-03-12) - Keep last line number to speed-up line number look-up (improvement). - `--warn-default-binding` added, `--warn-binding` rewritten. - `'value` implemented for integer numbers. - bug fix: - in `textio.read` for time. - `file_close` does not crash if file was already closed. - spurious unused warnings for protected types. - allow subtype names in slice during sensitivity extraction. - correctly set the default value of collapsed ports. - handling of stack2 (aka large concatenation bug). **0.17** (2005-02-26) - command `--elab-run` added. - Code generation for aggregate improved. - Library name of option `--work=` is checked. - `--no-run` option added to prevent simulation (may be used to disp tree only). - disp signal name in error when multiple sources drive an unresolved signal. - `-m`/`--gen-makefile` now handle several libraries. - dependences are not stored anymore in libraries (shorter/faster). - mentor version of ieee library is now provided. - handling of universal types is more consistent with LRM (almost corner cases). - iterator and indexes whose bounds were universal expressions are now of type integer or erroneous, according to the weird LRM rules. - handle selected name as entity name in architecture/configuration. - bug fix: - port map with expression (corner case ?). - forbid empty extended identifiers. - enumeration literal xrefs. - non-object name in sensitivity list crashed. - correctly handle alias of signals in processes. **0.16** (2005-01-02) - `std.textio`: readline has no limits on line length. - command `-r` (run) added. - bug fix: - better handling of errors in type conversion. - few uninitialized variables in ghdl itself caught. - parse error: `begin` in aggregates. - bad `unused subprogram` warnings. **0.15** (2004-10-13) - library file format modified to handle relative pathes. - install fixed to use relative pathes. - internal change: ortho API modified (constant are not anymore expressions). **0.14** (2004-08-29) - pretty printing in HTML command, `--pp-html`, added. - xref generation in HTML command, `--xref-html`, added. - syntax checking command, `-s`, added. - Code generation in whole command, `-c files -e unit`, added. - warns for unused subprograms. - bug box added to help bug reports. - `-s` (syntax check) command added. - Missing grt subprogram to close non-text file added. - maximum line length of `std.textio.readline` extended to 512 characters. - `std.textio.readline` assert error on truncated lines. - Handle P32 and P64 in `--trace-signals` - sequentials statements are not canonicalized (should be faster). - `DESTDIR` added in Makefile to ease packaging. - for `-m` command, re-parse modified files of the work library. - Many checks added on interfaces. - Many checks added on associations, better handling of conversions. - Checks for unassociated entity ports at elaboration. - bug fix: - resolution function can be an expanded name. - missing type check in a corner case. - emit an error when `EOF` is reached while a text file is read. - `std.textio.read` for negative number. - `std.textio.read` [integer]: correctly handle end of line. - parameters of protected type: handled and checked. - `gen_tree.c` modified to work with sparc. **0.13** (2004-06-26) - support of 64bits integers and 32bits time (not yet user available) - handle `'high` and `'low` attributes on non-locally static types and subtypes. - Many warning switches added (to control output of warnings). - `--gen-makefile` mode added to ghdl (to generate a Makefile) - alias identifier restrictions of vhdl-02 implemented. - declarative region for architecture from vhdl-02 implemented. - buffer port association rules of vhdl-02 implemented. - method operator restrictions of vhdl-02 implemented. - `'driving` and `'driving_value` implemented. - run-time bound check error message now contains file name and line number. - strings are not stored anymore with the identifiers. - parser does not back-track anymore. - bug fix: - name clash in generated `.s` files (arch and port/generic names). - implicit conversion of signal parameters. - handle locally static type conversion of arrays. - stabilize during elaboration of an unconstrained signal. - revert previous `vhdl87` conf spec bug fix, according to INT-1991 issue 27. - multiple visibility of declarations (eg: direct and alias). - names attribute of non-object aliases. **0.12** (2004-05-30) - simulation speed improved (2 fold) due to reduced activity optimization. - type conversion handled in associations - make mode of ghdl improved. - bug fix: - attribute specification - allow discrete type marks in choices - handling of generate statement for VCD - allow dereference in variable associations - allow function conversion in block port map - vhdl87: apply configuration specification inside generate stmts. - catch non-passive concurrent procedure calls in entity. - association of an unconstrained port with an expression. - declaring an uncons. array subtype of an uncons. array subtype. **0.11.1** (2004-04-24) - bug fix: - corner case of signal not updated - handle `'stable`, `'quiet` with a paramater > 0 - typos (missing `+ `) in sparc.S **0.11** (2004-04-17) - signal collapsing improved. - simulation kernel speed improved (maybe 5x faster). - `--lines` mode of ghdldrv added. - boolean signals are now dumped in vcd files. - bug fix: - in code generation for an aggregate. - run-time check of ascending order of projected transactions. - empty sequence of stmts in case alternatives (unidim array). - evaluation of locally static 'range attribute. - implicit conversion in formal function convertor. - return type is a type mark. **0.10** (2004-02-28) - architecture with many instances can be compiled with less memory. - `--stats` option added to the simulator, to evaluate performance. - signals are now collapsed between instances, if possible. - simulation is about 3x faster. - sparc port available (source only). - more checks added for attribute specification. - chop command added (split files by design unit). - bug fix: - absolute source files. - empty sequence of statements in case alternatives. **0.9** (2004-02-01) - VITAL level 0 restrictions checks added. - VITAL 2000 packages provided. - run-time information (such as signal names) rewritten. - SDF support added (partial and experimental). - bug fix: - allow elaboration even if no package body if the package is present in a file but not used by the hierarchy. - `delay_length` range is pre-elaborated (was not in v93). - crashed when a design unit is not found at elaboration. - allow association of `'stable`, `'quiet`... with signal interfaces. - concurrent procedure call creates a non-sensitized process. - effective value of non-scalar resolved signal might not be set. **0.8** (2003-11-05) - protected types (from 1076a/1076-2000) implemented. - file declarations are finalized in subprograms. - an exit call-back has been added in the run-time library. - internal modifications (nodes are stored in a table). - name of generated executable can be set with `-o` option. - IVI (ivi.sourceforge.org) support through a few VPI subprograms. - pure and wait checks added. - out ports are correctly dumped in VCD files. - bug fix: - signal declaration not allowed in processes. - several bugs fixed. **0.7** (2003-08-02) - layout of internal nodes improved. - incremental binding (vhdl93). - association of in port with expressions (vhdl93). - `--disp-time` option added. - make mode (`ghdl -m`) rewritten. - `'simple_name`, `'path_name` and `'instance_name` added (vhdl93). - bug fix: - instantiation added in hierarchy. - individual association of subelements by expression. - `--stop-delta` option is working. - correctly handle operators names at function call. - several small bugs fixed. **0.6** (2003-06-09) - internal modifications (single linked list used instead of arrays). - Mentor version of std_logic_arith is provided. - postponed handled (vhdl 93). - declarations allowed in a generate statement (vhdl 93). - non object aliases handled (vhdl93). - signatures handled (vhdl93). - bug fix: - `xnor` on `bit` and `boolean` is working. - `selected_name` list in use clauses. - many other small bug fixes. **0.5** (2003-05-10) - foreign attribute handled. You can now call subprograms defined in a foreign language (such as C or Ada). - ghdl entry point added: you can start the VHDL simulation from your own program. - bug fix: - triple use. - incomplete types **0.4.1** (2003-04-07) - bug fix: in the vcd output. **0.4** (2003-04-02) - `libgrt` does not depend on GNAT library anymore. Installation requirements are reduced. - `'delayed` attribute implemented. - `'transaction` attribute implemented. - unaffected (from vhdl-93) implemented. - ghdl action `--disp-standard` prints the std.standard package. - exponentiation operator, `**`, implemented for all integer and floating point types. - many other small bug fixes. - bug fix: subprogram interfaces are now elaborated.