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3452cbb107
compiler/mercury_compile_main.m:
If this new environment variable is set to always/never/1/0,
then enable or disable the use of color as directed. Do this regardless
of the setting of the NO_COLOR environment variable, since NO_COLOR
is a general setting while MERCURY_ENABLE_COLOR is a specific setting.
NO_COLOR is still consulted if MERCURY_ENABLE_COLOR is either not set,
or is set to a value we don't recognize.
compiler/globals.m:
Now that color diagnostics can be disabled using this new purpose-specific
envvar, stop taking an "" or "none" value of the MERCURY_COLOR_SCHEME
envvar as a request to disable colors in diagnostics.
compiler/options.m:
Shorten the name of the --enable-color-diagnostics option to just
--color-diagnostics.
compiler/handle_options.m:
Conform to the changes above.
tools/bootcheck:
Set MERCURY_ENABLE_COLOR to "always". Delete the unset of NO_COLOR,
since it should not be needed.
tests/invalid/Mmakefile:
tests/invalid_make_int/Mmakefile:
tests/invalid_nodepend/Mmakefile:
tests/invalid_onlydepend/Mmakefile:
tests/invalid_purity/Mmakefile:
tests/invalid_submodules/Mmakefile:
tests/recompilation/Mmakefile:
tests/warnings/Mmakefile:
Update the references to ---enable-color-diagnostics. Bootchecks would
work even if we deleted them, but keeping them slightly simplifies
running the tests outside of bootcheck.