Can someone add to the PH a version of the advice below? It might need
to be fleshed out a bit to provide more context.
Kris
Variable assignments with != are bad! Try as hard as you can to avoid
using them -- especially in Mk/*! Every time something processes your
makefile it will spawn a command, even if it is not relevant for the
operation being performed. If you need to run shell commands, try to
isolate them within a makefile target. You can avoid code duplication
by assigning the *shell commands* (not their output) to a variable and
inserting it into your code block.
e.g. instead of
--
VARIABLE!= do some shell stuff; do some other stuff
target:
echo ${VARIABLE}
--
do this (or similar):
--
VARIABLE_CMDS= do some shell stuff; do some other stuff
target:
echo $$(${VARIABLE_CMDS})
--
This defers the command execution to the point where the target runs, so
in the case when the target is *not* run (e.g. during INDEX builds or
other recursive port traversals), then you avoid wasting one or
more process executions.
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