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

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tests/make: use more distinctive placeholder for TMPDIR

Avoid test failures when more than one user run them.

Use a private  TMPDIR
a subdir of .OBJDIR if using it
otherwise /tmp/uid${.MAKE.UID}

Limit output of export tests to POSIX compatible env vars

Add .SHELL as read-only variable

The .SHELL variable represents the shellPath used to run
scripts.

Reviewed by: rillig, christos

make(1): add test for exporting single-character variables

make(1): prepare test for .export to show all exported variables

Currently the unit tests don't cover exporting of local variables like
.TARGET or @.  To see the effects, all exported variables must be listed
by the tests.

Give each group of tests its own output file.

* Rename each sub-makefile to *.mk;
* Add a *.exp file of expected output for each sub-makefile;
* Remove test.exp, which is replaced by all the other *.exp files.
* Use suffix rules to generate *.rawout and *.out files for
  each test case.
* Rewrite the test and accept targets to adapt to the new way.

The old (now removed) test.exp file is almost identical to the
concatenation (in the correct order) of all the new *.exp files.  There
are expected differences in makefile names embedded in the output, and
the new "exit status" lines.  Some old "*** Error code 1 (ignored)"
lines are also removed (replaced by new "exit status 1" lines).