We don't need to create a temporary buffered binary or text file object just to
create an empty file.

Replace also os.fdopen(handle).close() by os.close(handle).

to read the encoding cookie, instead of opening it in UTF-8.

encoding cookie, instead of opening it in UTF-8.

set the MACOSX_DEPLOYMENT_TARGET env variable for the interpreter process
on OS X.  This could cause failures in non-distutils subprocesses and was
unreliable since tests or user programs could modify the interpreter
environment after distutils set it.  Instead, have distutils set the
the deployment target only in the environment of each build subprocess.

Continue to use the previous algorithm for deriving the deployment target
value:
    if MACOSX_DEPLOYMENT_TARGET is not set in the interpreter's env:
        use the interpreter build configure MACOSX_DEPLOYMENT_TARGET
    elif the MACOSX_DEPLOYMENT_TARGET env value >= configure value:
        use the env MACOSX_DEPLOYMENT_TARGET
    else: # env value less than interpreter build configure value
        raise exception
This allows building extensions that can only run on newer versions of
the OS than the version python was built for, for example with a python
built for 10.3 or later and an extension that needs to be built for 10.5.

test_build_ext.

test_build_ext of test_distutils and test_command_build_ext of
test_packaging are no longer silently skipped when
run outside of a build directory.

test_build_ext of test_distutils is no longer silently skipped when
run outside of a build directory.

I have removed the reST target I added in 38cdca2cc253: it is not necessary, as
people can link to the glossary entry or the abc module without it.

Two indentation fixes from 3.2 collections.rst have been ported to 3.3
collections.abc.rst.

The tests now pass all combinations of -O/-OO and -B.  See also #7071
and #6292 for previous variations on the same theme.

test_versionpredicate needs a skip when sys.flags.optimize is true, but
I don’t know how to make that work with a DocTestSuite.

build_scripts command of packaging now handles correctly non-ASCII path (path
to the Python executable). Open and write the script in binary mode, but ensure
that the shebang is decodable from UTF-8 and from the encoding of the script.

(merge from 3.2) Issue #9516: avoid errors in sysconfig when MACOSX_DEPLOYMENT_TARGET is set in shell.

Without this patch python will fail to start properly when the environment
variable MACOSX_DEPLOYMENT_TARGET is set on MacOSX and has a value that is
not compatible with the value during Python's build. This is caused by code
in sysconfig that was only meant to be used in disutils.

Without this patch python will fail to start properly when the environment
variable MACOSX_DEPLOYMENT_TARGET is set on MacOSX and has a value that is
not compatible with the value during Python's build. This is caused by code
in sysconfig that was only meant to be used in disutils.

non-ASCII scripts. Open and write the script in binary mode, but ensure that
the shebang is decodable from UTF-8 and from the encoding of the script.

non-ASCII path (path to the Python executable). Open and write the script in
binary mode, but ensure that the shebang is decodable from UTF-8 and from the
encoding of the script.

non-ASCII path (path to the Python executable). Open and write the script in
binary mode, but ensure that the shebang is decodable from UTF-8 and from the
encoding of the script.