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build: remove the depend phase/barrier from the top Makefile 

With per-file dependencies now generated during compilation (previous commit),
the serial `depend` phase and its barrier are obsolete.  Drop SUBDIRS_DEPEND and
the `<dir>/Depend: ${DATABASE_H}` rule, and replace the `module@/lib@/tech@ %:
depend` prerequisite with `: ${DATABASE_H}` -- the only real ordering constraint
is the generated header, not a whole dependency-scanning pass.  Modules therefore
start compiling in parallel immediately instead of waiting for every subdir's
deps to be scanned first.

`make depend` is kept as a top-level no-op (the WASM build script still calls
`emmake make depend`).

Verified out-of-tree serial and -j12 and in-tree -j12: rc=0, 375 files, serial
and -j installs byte-identical, zero Depend files, source tree clean.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Darryl L. Miles 2026-07-23 14:49:37 +00:00 committed by R. Timothy Edwards
parent 1bc8537b5d
commit eaf42fab01
1 changed files with 13 additions and 15 deletions
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28
Makefile.in
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@ -96,15 +96,16 @@ ${DATABASE_H}: ${MAGICSRC}/database/database.h.in
prepare: ${DATABASE_H}
# module@<dir> builds <dir>/lib<dir>.o; lib@<dir> builds <dir>/lib<dir>.a.
# Every module@/lib@ waits for the whole `depend` phase first (it used to be a
# prereq of the `modules`/`libs` aggregates; moving it onto each per-dir target
# keeps depend before compilation even under -j).
# The only thing they must wait for is the generated header (${DATABASE_H}).
# Header *dependencies* are now discovered automatically per source (.deps, see
# rules.mak), so there is no separate `depend` phase to gate on -- modules start
# compiling in parallel immediately.
MODULE_TARGETS := $(addprefix module@,${MODULES})
LIB_TARGETS := $(addprefix lib@,${MODULES})
.PHONY: $(MODULE_TARGETS) $(LIB_TARGETS)
$(MODULE_TARGETS): module@%: depend
$(MODULE_TARGETS): module@%: ${DATABASE_H}
@$(call submake,$*,module)
$(LIB_TARGETS): lib@%: depend
$(LIB_TARGETS): lib@%: ${DATABASE_H}
@$(call submake,$*,lib)
# Cross-module archive edge (-j correctness): libdatabase.a physically archives
@ -129,23 +130,20 @@ SUBDIRS = bplane cmwind commands database dbwind debug drc extflat extract graph
BUNDLED_MODULES = readline lisp
# Unique list of all subdir that might have Depend file, we have to deduplicate otherwise
# MAKE will warning loudly. This list is somewhat empty when defs.mak does not exist
# Unique, deduplicated subdir list (used by the clean fan-out below).
SUBDIRS_FILTERED := $(shell echo ${MODULES} ${PROGRAMS} ${SUBDIRS} | tr ' ' '\n' | sort | uniq)
SUBDIRS_DEPEND = $(addsuffix /Depend, ${SUBDIRS_FILTERED})
${SUBDIRS_DEPEND}: ${DATABASE_H}
@echo --- making dependencies
@$(call submake,$(patsubst %/,%,$(dir $@)),depend)
# Dependencies are generated automatically as a side effect of compiling (see
# rules.mak .deps); there is no depend phase to run. "make depend" is kept as a
# no-op so callers that still invoke it (e.g. the WASM build script) do not error.
.PHONY: depend
depend: defs.mak ${SUBDIRS_DEPEND}
depend:
@echo "--- dependencies are generated automatically during compilation"
# tech@<dir>: build a technology dir (goal "all").
TECH_TARGETS := $(addprefix tech@,${TECHS})
.PHONY: $(TECH_TARGETS)
$(TECH_TARGETS): tech@%: depend
$(TECH_TARGETS): tech@%: ${DATABASE_H}
@$(call submake,$*,all)
.PHONY: techs