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2026.9.26.2: one compile database per configuration, emit plans every member, prepare actions and runtime search directories, DLLs beside a Windows program, link flags as words #1878

Job	Run time
windows→linux cross-build (windows host)	16m 45s
cross-build aarch64-linux-musl (mcpp + xlings)	16m 9s
mingw-cross linux→windows (build + wine run)	6m 56s
windows→linux artefact really runs (linux)	6s
	39m 56s