CVS log for src/usr.bin/make/unit-tests/escape.mk

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tests/make: clean up, explain and reorganize several tests

make(1): clean up tests error.mk and escape.mk

make(1): use consistent indentation in variable assignments

Initial work by "pkglint -F *.mk", manually adjusted in a few places.

make(1): use consistent RCS Id in test files

Merge changes from current as of 20200406

usr.bin/make: fix typos in comment

Add a test for backslash-newline at the very end of a command script.

Change @echo to echo in several places in escape.mk,
to make it easier to spot changes in what make sends to the shell.
Adjust escape.out to match.

In either a variable assignmentor a command, backslash-backslash-newline
does not escape the newline.  This is compatible with gmake.

Our practice is that an even number of backslashes before a newline
in a variable assignment simply stores the backslashes as part of the
value, and treats the newline as though it was not escaped.  This
is compatible with GNU make.

Our practice, despite what POSIX might say, is that "\#"
in a variable assignment stores "#" as part of the value.
The "\" is not taken literally, and the "#" does not begin a comment.

Convert the variable printing tests to use .USE rules,
to ensure that the value printed always comes from the expected variable.

Adjust tests to correct for the fact that end-of-line comments
in variable assignments should not be included in the value.

Also fix more typos.

Fix more typos in variable names.

Fix typos in variable names, and in a comment.

Add tests for backslash escaping in make(1).

Many of these tests fail, and I have populated the escape.exp file with
the results that I expect, not with the results that make(1) actually
produces.

Also update the set lists for these tests.