Daniel Fanache 8b988e8bd9
tools/Config.mk: eval compiler include-prefix detection only once ...
Three `export VAR ?= $(shell ...)` assignments cause GNU make to
re-run the embedded ${shell ...} every time the variable is exported
to a recipe's environment. That spawns `tools/incdir` and
`tools/define` once per recipe, serialised through the master make
thread, which adds per recipe overhead to multi-job builds.
Wrap each with `ifeq ($(origin VAR),undefined)` + `:=` so the shell
call runs once at parse time while preserving the override semantics
of `?=`.
Measured impact on a 20-core build host is a ~26% speedup of wall
time.
Signed-off-by: Daniel Fanache <dan@rts.ro >
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Daniel Fanache
8b988e8bd9