Deprecations

The following deprecated items are scheduled for future removal:

C++14 compiler support

Verilator currently requires a C++20 or newer compiler for timing, and a C++14 or newer compiler for both compiling Verilator and compiling Verilated models with –no-timing.

Verilator will require C++20 or newer compilers for both compiling Verilator and compiling all Verilated models no sooner than May 2025. (Although this date has expired, this change is currently on hold until the Ubuntu LTS versions of GCC and clang use C++20 by default, estimated May 2028.)

tcmalloc support

Verilator currently supports the default malloc, tcmalloc, or jemalloc. As jemalloc has better performance, support for tcmalloc may be removed no sooner than January 2027.

Pragma /*verilator fsm_reset_arc*/

Verilator currently supports /*verilator fsm_reset_arc*/ which aliases /*verilator fsm_state*/. This alias may be removed no sooner than February 2027.