CVS log for src/usr.bin/make/unit-tests/opt-debug-file.exp

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make: error out on some more syntax errors

Previously, these errors only produced a message on stderr.  They only
affected make's exit status when they were evaluated at parse time, but
not when evaluating the commands for a specific target right before
executing them.

The affected syntax errors are:
* invalid regular expressions in the ':C' modifier
* out-of-range references to regex groups in the ':C' modifier
* unfinished modifiers

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.

make: make debug logging for comparisons less technical

tests/make: clean up after test for option '-dF'

When the file for the debug log cannot be opened, make exits
immediately.  This doesn't give the test a chance to clean up the
temporary log file.

Instead of trying to treat a regular file as a directory and create a
file in it, assume that the directory /nonexistent-$uuid is actually
nonexistent.  This leads to the same kind of error message, independent
of strerror(3).

tests/make: test output channels for parse errors and other errors

make: remove usage message if the debug file cannot be opened

Since a non-writable file is not a syntax error, there is no point in
showing the usage in this situation.  Showing the usage may have been a
copy-and-paste mistake from a few lines below, when this option was
added back in main.c 1.133 from 2006-10-15.

tests/make: cover a debug log file that cannot be opened

make(1): add tests for each debug option