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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 to 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
  • Main repository is now on github: github.com/tgingold/ghdl
  • Docs available on rtd: ghdl.readthedocks.org
  • Speed improved.
  • New option --psl-report, to report status of PSL assert and cover.
  • VHDL2008: support nested package

0.33 (2015-10-04)

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) 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.