CVS log for src/usr.bin/make/unit-tests/dep-var.exp

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make: error out on parse/evaluation errors in shell commands

The expression ${VAR:X} has an unknown modifier ':X'.  Previously, this
expression errored out when the expression was evaluated at parse time,
but not when the expression was evaluated when generating the commands
to bring a target up to date.  The errors were previously reported, they
didn't affect the exit status, though.

Now, errors in expressions are handled in the same way, regardless of
the time at which they are evaluated.

make: sync VarEvalMode constant names with their debug log names

make: replace 'variable expression' with 'expression' in diagnostics

tests/make: update test for evaluating undefined variables

make(1): fix off-by-one error in SuffExpandChildren

In suff.c r1.144 from yesterday, in the line "cp += nested_p - cp", I
accidentally removed the "- 1".  Since these "- 1" lines lead to slow
execution, each branch now increments the pointer separately by the
actually needed amount.

Fixing this bug posed way more new questions than it answered, and it
revealed an inconsistency in the parser about how characters are to be
escaped, and missing details in the documentation of Var_Parse, as well
as a parse error that unexpectedly doesn't stop make from continuing.

make(1): add test for expansion of indirect variables in dependencies

make: extend test for unresolved variables in dependencies

This is to ensure that the upcoming refactoring of Var_Parse in
SuffExpandChildren does not break anything.

make(1): add test for deferred variable expansion in dependencies