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) <noreply@anthropic.com>
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| .. | ||
| .gitignore | ||
| config.guess | ||
| config.sub | ||
| configure | ||
| configure.in | ||
| configure_mac | ||
| defs.mak.in | ||
| install-sh | ||
| magic.spec.in | ||
| makedbh.in | ||
| missing | ||
| mkdirs | ||
| mkinstalldirs | ||
| preproc.py | ||
| printmans | ||