utils.mk: give write_rc a do- sibling

[oharboe]

flow/Makefile states the convention where it generates the copy rules:

# generate make rules to copy a file, if a dependency change and
# a do- sibling rule that copies the file unconditionally.

do-klayout_tech, do-synth-report, do-step and do-copy all follow
it. The file target decides whether to run and delegates with
$(UNSET_AND_MAKE), and the do- target is the single place the
invocation lives:

synth-report: synth
	$(UNSET_AND_MAKE) do-synth-report

.PHONY: do-synth-report
do-synth-report:
	$(RUN_CMD) --log ... -- $(OPENROAD_CMD) $(SCRIPTS_DIR)/synth_metrics.tcl

write_rc is the one that conflates the two, so a caller doing its own
dependency checking cannot ask for just the operation.

The file target delegates rather than keeping a second copy of the
$(RUN_CMD) line, which is the same shape as every other do- pair.
Make's dependency checking is left exactly as it is.

🤖 Generated with Claude Code

[gemini-code-assist]

Code Review

This pull request refactors the write_rc pattern rule in flow/util/utils.mk to delegate its execution to a new .PHONY target do-write_rc using $(UNSET_AND_MAKE). This aligns it with other do- sibling targets in the build system. There are no review comments, so no additional feedback is provided.

[openroad-ci]

🔍 QoR check

Metrics reflect the PR merge build — i.e. what will land on the target branch.

Commit 78ed16b · Jenkins build #2 · Baseline: build · View build on dashboard

62 design(s) checked — 0 with regression(s), 1 without a comparable baseline.