CVS log for src/usr.bin/make/unit-tests/cmd-errors-lint.exp

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make: reduce line length in error messages

The error messages for deeply nested parse errors were hard to decipher,
due to the large amount of text.  Split these messages into individual
lines, just as in the backtrace for .include files and .for loops.  This
unified backtrace makes the output more uniform.

make: don't run erroneous commands in compat mode

When there is a parse or evaluation error in an expression that becomes
part of the command, don't run that command, as the result of the failed
evaluation typically contains garbage characters. Skip the remaining
commands from that target as well, as they may depend on the erroneous
command.

make: error out on unclosed expressions during parse time

In exchange, this adds location information.

For unnamed expressions, the value is no longer printed.  This will be
added back in a follow-up commit.

make: add more context information to error messages

In case of a parse error or evaluation error, print the variable value
in addition to the variable name, to see the effects of previous
expression modifiers.

In nested make calls, print the current directory at the bottom of a
stack trace, as that information is otherwise hard to get in a parallel
build spanning multiple directories.

make: clean up comments, code and tests

make: provide more context information for parse/evaluate errors

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

make: improve error message for unknown modifier

Back in 1995, the modifiers were all single-character, and it made sense
to print only the first character.  Nowadays, with ':S', ':@var@...@',
'::=' and several others, a little more context is useful to see where
the exact error is.  The actual modifier is still guessed, and the guess
may be wrong as soon as backslashes get involved, but it is still better
than before.

make(1): error out on unclosed expressions after the colon

make(1): add test for parse errors in commands in lint mode (-dL)

The difference to non-lint mode is that the exit status is now 2 instead
of 0.