if symabis != "" {
		defaultGcFlags = append(defaultGcFlags, "-symabis", symabis)
	}

	gcflags := str.StringList(forcedGcflags, p.Internal.Gcflags)
	if p.Internal.FuzzInstrument {
		gcflags = append(gcflags, fuzzInstrumentFlags()...)
	}
	// Add -c=N to use concurrent backend compilation, if possible.
	if c := gcBackendConcurrency(gcflags); c > 1 {
		defaultGcFlags = append(defaultGcFlags, fmt.Sprintf("-c=%d", c))
	}