5719a536e8
When ccache is on PATH, prefix CC/CXX with it so every compile goes through
ccache -- no Makefile change, since rules.mak already runs `${CC} ... -c` and
defs.mak substitutes @CC@/@CXX@. Autodetected on by default; --disable-ccache
opts out.
Placed after the AC_PROG_C* checks so configure's own feature tests use the
plain compiler and only the build picks up the prefix. Pairs with the
build-info isolation (utils/buildinfo.c): with the volatile MAGIC_BUILDDATE on
only that one unit, a full rebuild hits the cache for every other unit.
Measured (default Tcl build, all objects deleted then rebuilt): 323/324 hits
with the date enabled (only buildinfo.o misses), 324/324 with
--disable-magic-builddate.
Verified: default configure -> CC="ccache gcc", CXX="ccache g++";
--disable-ccache -> CC="gcc".
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 | ||