I didn't try logging on NetBSD, but on the mac, at the suggestion of a colleague, I added: CCACHE_COMPILERCHECK?= %compiler% -v .export CCACHE_COMPILERCHECK That restores the expected behavior; I see 17/1 direct/preprocessed hits. The ccache man page warns about this; by default the compiler is identified by the combination of mtime and size, and the mtime changes every run. So I wonder why this is a problem now. It seems mk/compiler/ccache.mk sets CCACHE_HASHCC, but that variable is not mentioned any more in the 3.1.4 man page. So it seems we need to change ccache.mk to set CCACHE_COMPILERCHECK (additionally), so it works with either version of ccache.
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