Changelog:
* Verilator 4.100 2020-09-07
** C++11 or newer compilers are now required.
** SystemC 2.3.0 or newer (SYSTEMC_VERSION >= 20111121) is now required.
** Support hierarchical Verilation (#2206). [Yutetsu TAKATSUKASA]
**** Support (with limitations) class extern, class extends, virtual class.
**** Support $urandom, $urandom_range without stability.
**** Fix false DECLFILENAME on black-boxed modules (#2430). [Philipp Wagner]
**** Fix naming of "id : begin" blocks.
**** Fix class constructor error on assignments to const.
**** Fix splitting eval functions with --output-split-cfuncs (#2368). [Geza Lore]
**** Fix queues as class members (#2525). [nanduraj1]
**** Add support for assume property. [Peter Monsson]
* Verilator 4.040 2020-08-15
** Version 4.040 is planned to be the final version that will
support pre-C++11 compilers. Please move to C++11 or newer compilers.
*** Fix arrayed interfaces, broke in 4.038 (#2468). [Josh Redford]
**** Support $stable, $rose and $fell. (#2148) (#2501) [Peter Monsson]
**** Support simple function localparams (#2461). [James Hanlon]
**** Miscellaneous parsing error changes towards UVM support.
**** Fix arrayed interfaces (#2469). [Josh Redford]
**** Fix protect lib VCS warning. (#2479) [Julien Margetts]
**** Fix combining different-width parameters (#2484). [abirkmanis]
**** Fix protect-lib without sequential logic (#2492). [Yutetsu TAKATSUKASA]
**** Fix V3Unknown from running with flat XML output (#2494). [James Hanlon]
**** Fix non-32 bit conversion to float (#2495). [dsvf]
**** Fix casting non-self-determined subexpressions (#2493). [phantom-killua]
**** Fix SystemC net names (#2500). [Edgar E. Iglesias]
**** Fix build with Bison 3.7 and newer (#2505). [Rupert Swarbrick]
**** Fix slice of unpacked array (#2506) (#2507). [Yutetsu TAKATSUKASA]
* Verilator 4.038 2020-07-11
** Versions 4.038 and 4.040 are planned to be the final versions that will
support pre-C++11 compilers. Please move to C++11 or newer compilers.
*** Support VPI access to parameters and localparam. [Ludwig Rogiers]
*** Support parsing (not elaboration, yet) of UVM.
**** Add new UNSUPPORTED error code to replace most previous Unsupported: messages.
**** With --bbox-unsup continue parsing on many (not all) UVM constructs.
**** Support for-loop increments with commas.
**** Support $swrite with arbitrary arguments.
**** Support $writememb (#2450). [Fan Shupei]
**** Fix OS X, Free BSD, and -m32 portability issues. [Geza Lore]
**** Fix to flush FST trace on termination due to $stop or assertion failure.
**** Fix part select error when multipling by power-of-two (#2413). [Conor McCullough]
**** Fix division exception (#2460) [Kuoping Hsu]
* Verilator 4.036 2020-06-06
** OPT_FAST is now -Os by default. See the BENCHMARKING & OPTIMIZATION part
of the manual if you experience issues with compilation speed.
*** Configure now enables SystemC if it is installed as a system headers,
e.g. with 'apt-get install systemc-dev'.
*** Add --waiver-output flag that writes a verilator config file (.vlt) with
waivers to the warnings emitted during a Verilator run.
*** Support verilator_coverage --write-info for lcov HTML reports.
Line Coverage now tracks all statement lines, not just branch lines.
*** --output-split is now on by default. VM_PARALLEL_BUILDS is set by
default iff the --output-split caused an actual file split to occur.
--output-split-cfuncs and --output-split-ctrace now default to the
value of --output-split. These changes should improve build times of
medium and large designs with default options. User makefiles may
require changes.
*** The run-time library is now compiled with -Os by default. (#2369, #2373)
**** Support multi channel descriptor I/O (#2190) [Stephen Henry]
**** Support $countbits. (#2287) [Yossi Nivin]
**** Support $isunbounded and parameter $. (#2104)
**** Support unpacked array .sum and .product.
**** Support prefix/postfix increment/decrement. (#2223) [Maciej Sobkowski]
**** Fix FST tracing of little bit endian signals. [Geza Lore]
**** Fix +: and -: on unpacked arrays. (#2304) [engr248]
**** Fix $isunknown with constant Z's.
**** Fix queues and dynamic array wide ops. (#2352) [Vassilis Papaefstathiou]
* Verilator 4.034 2020-05-03
** Add simplistic class support with many restrictions, see manual. (#377)
** Support IEEE time units and time precisions. (#234)
Includes `timescale, $printtimescale, $timeformat.
VL_TIME_MULTIPLIER, VL_TIME_PRECISION, VL_TIME_UNIT have been removed
and the time precision must now match the SystemC time precision. To
get closer behavior to older versions, use e.g. --timescale-override
"1ps/1ps".
** Add --build to call make automatically. (#2249) [Yutetsu TAKATSUKASA]
** Configuring with ccache present now defaults to using it; see OBJCACHE.
** Fix DPI import/export to be standard compliant. (#2236) [Geza Lore]
** Add --trace-threads for general multithreaded tracing. (#2269) [Geza Lore]
*** Add --flatten for use with --xml-only. (#2270) [James Hanlon]
**** Greatly improve FST/VCD dump performance (#2244) (#2246) (#2250) (#2257) [Geza Lore]
**** Support $ferror, and $fflush without arguments. (#1638)
**** Support event data type (with some restrictions).
**** Support $root. (#2150) [Keyi Zhang]
**** Add error if use SystemC 2.2 and earlier (pre-2011) as is deprecated.
**** Fix build of fast path tracing code to use OPT_FAST. (#2245) [Geza Lore]
**** Fix arrayed instances connecting to slices. (#2263) [Don/engr248]
**** Fix error on unpacked connecting to packed. (#2288) [Joseph Shaker]
**** Fix logical not optimization with empty begin. (#2291) [Baltazar Ortiz]
**** Fix reduction OR on wide data, broke in v4.026. (#2300) [Jack Koenig]
**** Fix clock enables with bit-extends. (#2299) [Marco Widmer]
**** Fix MacOs Homebrew by removing default LIBS. (#2298) [Ryan Clarke]
* Verilator 4.032 2020-04-04
*** Add column numbers to errors and warnings.
*** Add GCC 9-style line number prefix when showing source text for errors.
*** Add setting VM_PARALLEL_BUILDS=1 when using --output-split. (#2185)
*** Change --quiet-exit to also suppress 'Exiting due to N errors'.
**** Suppress REALCVT for whole real numbers.
**** Support split_var in vlt files. (#2219) [Marco Widmer]
**** Fix parameter type redeclaring a type. (#2195) [hdzhangdoc]
**** Fix VCD open with empty filename. (#2198) [Julius Baxter]
**** Fix packages as enum base types. (#2202) [Driss Hafdi]
**** Fix duplicate typedefs in generate for. (#2205) [hdzhangdoc]
**** Fix MinW portability. (#2114) [Sean Cross]
**** Fix assertions with unique case inside. (#2199) [hdzhangdoc]
**** Fix implicit conversion of floats to wide integers.
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