Verilator 4.216 2021-12-05 released

[wsnyder]

Verilator 4.216 2021-12-05

Major:

• Add --lib-create, similar to --protect-lib but without protections.
• Support tracing through --hierarchical/--lib-create libraries (#3200).

Minor:

• Internal code cleanups and improvements. [Geza Lore]
• Improve --thread verilation-time performance.
• Support task name in $display %m (include task in hierarchichal name from %m format verilator#3211). [Julie Schwartz]
• Make 'bit', 'logic' and 'time' types unsigned by default. [Geza Lore]
• Optimize $random concatenates/selects (Optimize $random concat/select verilator#3114).
• Fix array method names with parenthesis (Array method name failed to parse if conflict with sv keywords verilator#3181) (add issue3181 fix verilator#3183). [Teng Huang]
• Fix split_var assign merging (split_var not working as expected verilator#3177) (Skip merging assign statements if a variable is marked split_var to fix #3177 verilator#3179). [Yutetsu TAKATSUKASA]
• Fix wrong bit op tree optimization (Fix wrong bit op tree optimization verilator#3185). [Yutetsu TAKATSUKASA]
• Fix some SliceSels not being constants (Can't convert a SLICESEL to constant (when it should be possible). verilator#3186) (Issue 3186 verilator#3218). [Michaël Lefebvre]
• Fix nested generate if genblk naming (Internal error of duplicate declaration when using generate blcok. verilator#3189). [yanx21]
• Fix hang on recursive definition error (Recursive parameter creates Infinite loop in Verilator --lint-only verilator#3199). [Jonathan Kimmitt]
• Fix display of signed without format (Signed-ness ignored in display of value without format spec verilator#3204). [Julie Schwartz]
• Fix display of empty string constant (Display of empty string appears as space verilator#3207) (Internal error on string parameter in latest master verilator#3215). [Julie Schwartz]
• Fix incorrect width after and-or optimization (Missing bits in display of a concat verilator#3208). [Julie Schwartz]
• Fix $fopen etc on integer arrays (Unsupported error on array of file descriptors verilator#3214). [adrienlemasle]
• Fix $size on dynamic strings ($size returns wrong value for dynamic strings verilator#3216).
• Fix %0 format on $value$plusargs (Support %0 in $value$plusargs verilator#3217).
• Fix timescale portability on Arm64 (Fix timescale on Arm64 due to char being unsigned verilator#3222).