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.)

XML output

Verilator currently supports XML parser output (enabled with –xml-only). Support for –xml-* options will be deprecated no sooner than January 2026.

–make cmake

The –make cmake options is deprecated and will be removed no sooner than January 2026. Use –make json instead. Note that the CMake integration shipping with Verilator (verilator-config.mk) already uses –make json so no changes are necessary if using that.