Adjust disable_ieee_warnings for NVC >= 1.16

For the next release of NVC this should be passed as a global option
rather than a "run" option (because warnings can be produced during
elaboration too).  Passing to the run command is still supported so old
versions of VUnit will continue to work, but the option may not take
effect in some situations.

Author: nickg

vunit/sim_if/nvc.py

@@ -89,6 +89,7 @@ def __init__(  # pylint: disable=too-many-arguments
         self._coverage_test_dirs = set()
         (major, minor) = self.determine_version(prefix)
         self._supports_jit = major > 1 or (major == 1 and minor >= 9)
+        self._ieee_warnings_global = major > 1 or (major == 1 and minor >= 16)
 
         if self.use_color:
             environ["NVC_COLORS"] = "always"
@@ -263,6 +264,9 @@ def simulate(
         else:
             wave_file = None
 
+        if self._ieee_warnings_global and config.sim_options.get("disable_ieee_warnings", False):
+            cmd += ["--ieee-warnings=off"]
+
         cmd += ["-H", config.sim_options.get("nvc.heap_size", "64m")]
         cmd += config.sim_options.get("nvc.global_flags", [])
 
@@ -285,7 +289,7 @@ def simulate(
             cmd += config.sim_options.get("nvc.sim_flags", [])
             cmd += [f"--exit-severity={config.vhdl_assert_stop_level}"]
 
-            if config.sim_options.get("disable_ieee_warnings", False):
+            if not self._ieee_warnings_global and config.sim_options.get("disable_ieee_warnings", False):
                 cmd += ["--ieee-warnings=off"]
 
             if wave_file: