when output is redirected to a file, compiler error messages show
   up before Distutils prints the command being invoked.

   whether the Distutils being used supports a particularly capability.

   (This idea was originally suggested by Juergen Hermann as a method
    on the Distribution class.  I think it makes more sense as a
    function in core.py, and that's what this patch implements.)

arguments, triggering a warning instead of raising an exception.  (In
1.5.2/2.0, it will print to stderr.)

Bugfix candidate for all previous versions.  This changes behaviour,
but the old behaviour wasn't very useful.  If Distutils version X+1
adds a new keyword argument, using the new keyword means your setup.py
file won't work with Distutils version X any more.

the flag.  Punt and return a -L flag instead (returning "" gums up the
command to be forked).

CCompiler may rely on the presence of self.verbose (SciPy's distutils
appears to).

Strangely, two out of three patches there seem already committed; but
the essential one (get rid of the assert in object_filenames in
ccompiler.py) was not yet applied.

This makes the build procedure for Twisted work again.

This is *not* a backport candidate despite the fact that identical
code appears to exist in 2.2.2; Twisted builds fine there, so there
must have been a change elsewhere.

Note that distutils.core.DEBUG still works if client code uses it, but
the core code avoids circular references by using distutils.debug.

    to the command-line arguments.  Fix this by adding the source filename.

(Bugfix candidate for 2.2, and likely 2.1 as well)

Weinberg).  This changes all uses of deprecated tempfile functions to
the recommended ones.

- implement viable library search routine for EMX

calling Python was installed was so complicated, so I simplified it.

This should get the snake-farm's build scripts working again.

Fixed various MacPython-specific issues found by attempting to use the standard core setup.py for MacPython.

This module broke on the Mac (where it can't work, but distutils seems to import it anyway) because it imported pwd and grp. Moved the import to inside the routine where they're used.

XXX Why doesn't distutils on Windows use the same set of flags as Python?

The default implementation calls _compile() to compile individual
files.  This method must be implemented by the subclass.  This change
factors out most of the remaining common code in all the compilers
except mwerks.

Two new tests are needed:

Don't skip building an extension if any of the depends files are newer
than the target.

Pass ext.depends to compiler.compile() so that it can track individual
files.

Always use _setup_compile() to do the grunt work of processing
arguments, figuring out which files to compile, and emitting debug
messages for files that are up-to-date.

Use _get_cc_args() when possible.

This change is not backwards compatible.  If a compiler subclass
exists outside the distutils package, it may get called with the
unexpected keyword arg.  It's easy to extend that compiler by having
it ignore the argument, and not much harder to do the right thing.  If
this ends up being burdensome, we can change it before 2.3 final to
work harder at compatibility.

Also add _setup_compile() and _get_cc_args() helper functions that
factor out much of the boilerplate for each concrete compiler class.

Remove __init__ that just called base class __init__ with same args.
Fold long argument lists into fewer, shorter lines.
Remove parens in tuple unpacks.
Don't put multiple statements on one line with a semicolon.
In find_library_file() compute the library_filename() upfront.