logger - set logger properties

yosys> help logger

logger [options]

This command sets global logger properties, also available using command line
options.

-[no]time

enable/disable display of timestamp in log output.

-[no]stderr

enable/disable logging errors to stderr.

-warn regex

print a warning for all log messages matching the regex.

-nowarn regex

if a warning message matches the regex, it is printed as regular
message instead.

-werror regex

if a warning message matches the regex, it is printed as error
message instead and the tool terminates with a nonzero return code.

-[no]debug

globally enable/disable debug log messages.

-experimental <feature>

do not print warnings for the specified experimental feature

-expect <type> <regex> <expected_count>

expect log, warning or error to appear. matched errors will terminate
with exit code 0.

-expect-no-warnings

gives error in case there is at least one warning that is not expected.

-check-expected

verifies that the patterns previously set up by -expect have actually
been met, then clears the expected log list.  If this is not called
manually, the check will happen at yosys exist time instead.