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History log of /src/usr.bin/make/unit-tests/cmdline-undefined.exp
RevisionDateAuthorComments
 1.5  30-Jun-2025  rillig tests/make: force expected lines to be listed in execution order

The diagnostics from the program to check the "expect" lines in the unit
test files were hard to follow since the "out-of-order" lines were
confusing. For out-of-order lines, state where they should be placed
instead.
 1.4  30-Mar-2025  rillig make: use '"filename" line 123' for locations instead of 'filename:123'

The format 'filename:123' is commonly used for identifying a location in
a file. Text editors recognize it and allow quick navigation through it.
The previous format was specific to make and would have required custom
support in editors.

The new format was already used in stack traces, except for the first
line. Now all lines use the same format.
 1.3  01-Jun-2023  rillig tests/make: force line-based diagnostics to be listed in the tests

This way, contradictions between the intended output and the actual
output are closer together and have a better chance of being spotted.
 1.2  04-Nov-2020  rillig make(1): fix line numbers in test output of cmdline-undefined.mk
 1.1  04-Nov-2020  rillig make(1): add test for undefined variables in command line arguments

The variable discardUndefined has an implicit negation in its name,
which makes it hard to understand. Plus, most of the time it is true.
It's better to have a flag that is false most of the time and has a
positive name.

On the first attempt of inverting that variable, I stumbled upon
MainParseArgs, which initially leaves discardUndefined == FALSE, and
after handling the dashed options, sets it to TRUE. This would make a
difference when more command line arguments would be added later via the
.MAKEFLAGS special target.

Upon further inspection, the only place where discardUndefined is used
is in VarAssign_EvalSubst in parse.c, and that place is not reachable
from any of the dashed options. Therefore, discardUndefined could
already be set at the very beginning of MainParseArgs or even when
initializing the global variable itself, without any observable
difference.

Not even the ::= variable modifier could do anything about this since it
is not reachable from the dashed command line options as well, and in
addition, it expands its right-hand side in any case, always discarding
undefined variables. Oh, these little inconsistencies everywhere.

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