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https://github.com/RTimothyEdwards/magic.git
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Darryl L. MilesandClaude Opus 4.8
1bc8537b5d
Replace the monolithic per-directory `Depend` file -- generated by a separate,
serial `make depend` pass (one `gcc -MM` over all sources) and post-processed by
sed -- with automake-style per-file dependency fragments produced as a side
effect of each compile.
rules.mak's %.o rule now adds, when the compiler supports it,
-MMD -MP -MF .deps/<stem>.d
so every object records the (non-system) headers it used. Those fragments are
`-include`d best-effort: absent on a first build, present and correct after.
Benefits:
* self-maintaining -- no explicit depend step; deps refresh on every compile;
* parallel -- generated during the (already parallel) compile, no barrier;
* -MMD already drops system headers (what the sed did) and -MP tolerates a
removed/renamed header, so the sed post-processing is gone;
* fixes out-of-tree incremental header tracking: with an absolute srcdir the
old sed stripped the now-absolute *local* header paths too, silently losing
them; the .d files keep them.
configure probes `-MMD -MP` (AUTODEP_FLAGS; empty and best-effort-skipped if the
compiler cannot). clean/distclean remove .deps (rm -r); .gitignore replaces the
obsolete */Depend with .deps/. `make depend` is kept as a no-op for callers that
still invoke it (e.g. the WASM build script).
Verified out-of-tree (--disable-ccache): 324 .d files, 0 Depend files, a header
touch recompiles its dependents, no-op rebuild is idle, clean clears .deps. (The
top-level depend phase still runs here as a no-op; removed next.)
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
58 lines
2.1 KiB
Makefile
58 lines
2.1 KiB
Makefile
# You shouldn't need to edit this file, see the defs.mak file
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module: lib${MODULE}.o
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# Dependencies are now generated automatically as a side effect of each compile
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# (see the %.o rule below); "make depend" is a no-op kept only so scripts/habits
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# that still invoke it do not error.
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.PHONY: depend
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depend:
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# Compile a source into an object. When the compiler supports it
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# (AUTODEP_FLAGS = "-MMD -MP"), also write .deps/<stem>.d listing the non-system
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# headers this object used -- generated as a side effect of the compile, so there
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# is no separate serial "make depend" pass and it parallelises for free. -MMD
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# already drops system headers (the job the old sed did), and -MP adds a phony
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# target per header so a later removed/renamed header does not break the build.
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%.o: %.c
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@echo --- compiling ${MODULE}/$*.o
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@test -z "${AUTODEP_FLAGS}" || mkdir -p .deps
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${RM} $*.o
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${CC} ${CFLAGS} ${CPPFLAGS} ${DFLAGS} ${AUTODEP_FLAGS} $(if ${AUTODEP_FLAGS},-MF .deps/$*.d) -c $< -o $@
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lib${MODULE}.o: ${OBJS}
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@echo --- linking lib${MODULE}.o
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${RM} lib${MODULE}.o
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${LINK} ${OBJS} -o lib${MODULE}.o ${EXTERN_LIBS}
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lib: lib${MODULE}.a
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lib${MODULE}.a: ${OBJS} ${LIB_OBJS}
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@echo --- archiving lib${MODULE}.a
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${RM} lib${MODULE}.a
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${AR} ${ARFLAGS} lib${MODULE}.a ${OBJS} ${LIB_OBJS}
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${RANLIB} lib${MODULE}.a
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${MODULE}: lib${MODULE}.o ${EXTRA_LIBS}
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@echo --- building main ${MODULE}
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${RM} ${MODULE}
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${CC} ${CFLAGS} ${CPPFLAGS} ${DFLAGS} lib${MODULE}.o ${EXTRA_LIBS} -o ${MODULE} ${LIBS}
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${DESTDIR}${BINDIR}/${MODULE}${EXEEXT}: ${MODULE}${EXEEXT}
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${RM} ${DESTDIR}${BINDIR}/${MODULE}${EXEEXT}
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${CP} ${MODULE}${EXEEXT} ${DESTDIR}${BINDIR}
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.PHONY: clean
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clean:
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${RM} ${CLEANS}
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${RM} -r .deps
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tags: ${SRCS} ${LIB_SRCS}
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ctags $(addprefix $(srcdir)/,${SRCS} ${LIB_SRCS})
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# Per-file dependency fragments written by the %.o rule above. Best effort: none
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# exist on a first build (everything compiles anyway); on later builds they cause
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# a recompile when a used header changes. `-include` tolerates their absence and
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# the `-MP` phony header targets tolerate a removed/renamed header.
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-include $(wildcard .deps/*.d)
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