Verilator 4.034 2020-05-03 released

Major:

Add simplistic class support with many restrictions, see manual. (verilator/verilator#377)
Support IEEE time units and time precisions. (verilator/verilator#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. (verilator/verilator#2249) [Yutetsu TAKATSUKASA]
Configuring with ccache present now defaults to using it; see OBJCACHE.
Fix DPI import/export to be standard compliant. (verilator/verilator#2236) [Geza Lore]
Add --trace-threads for general multithreaded tracing. (verilator/verilator#2269) [Geza Lore]

Notable:

Add --flatten for use with --xml-only. (verilator/verilator#2270) [James Hanlon]

Other:

Greatly improve FST/VCD dump performance (verilator/verilator#2244) (verilator/verilator#2246) (verilator/verilator#2250) (verilator/verilator#2257) [Geza Lore]
Support $ferror, and $fflush without arguments. (verilator/verilator#1638)
Support event data type (with some restrictions).
Support $root. (verilator/verilator#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. (verilator/verilator#2245) [Geza Lore]
Fix arrayed instances connecting to slices. (verilator/verilator#2263) [Don/engr248]
Fix error on unpacked connecting to packed. (verilator/verilator#2288) [Joseph Shaker]
Fix logical not optimization with empty begin. (verilator/verilator#2291) [Baltazar Ortiz]
Fix reduction OR on wide data, broke in v4.026. (verilator/verilator#2300) [Jack Koenig]
Fix clock enables with bit-extends. (verilator/verilator#2299) [Marco Widmer]
Fix MacOs Homebrew by removing default LIBS. (verilator/verilator#2298) [Ryan Clarke]

verilator / verilator-announce