1
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Improved support for Microsoft Visual C++ compilers.

Known supported compilers:
--------------------------
Microsoft Visual C++ 9.0:
    Microsoft Visual C++ Compiler for Python 2.7 (x86, amd64)
    Microsoft Windows SDK 6.1 (x86, x64, ia64)
    Microsoft Windows SDK 7.0 (x86, x64, ia64)

Microsoft Visual C++ 10.0:
    Microsoft Windows SDK 7.1 (x86, x64, ia64)

Microsoft Visual C++ 14.X:
    Microsoft Visual C++ Build Tools 2015 (x86, x64, arm)
    Microsoft Visual Studio Build Tools 2017 (x86, x64, arm, arm64)
    Microsoft Visual Studio Build Tools 2019 (x86, x64, arm, arm64)

This may also support compilers shipped with compatible Visual Studio versions.
"""

import json
from io import open
from os import listdir, pathsep
from os.path import join, isfile, isdir, dirname
import sys
import contextlib
import platform
import itertools
import subprocess
import distutils.errors
from setuptools.extern.packaging.version import LegacyVersion

from .monkey import get_unpatched

if platform.system() == 'Windows':
    import winreg
    from os import environ
else:
    # Mock winreg and environ so the module can be imported on this platform.

    class winreg:
        HKEY_USERS = None
        HKEY_CURRENT_USER = None
        HKEY_LOCAL_MACHINE = None
        HKEY_CLASSES_ROOT = None

    environ = dict()

_msvc9_suppress_errors = (
    # msvc9compiler isn't available on some platforms
    ImportError,

    # msvc9compiler raises DistutilsPlatformError in some
    # environments. See #1118.
    distutils.errors.DistutilsPlatformError,
)

try:
    from distutils.msvc9compiler import Reg
except _msvc9_suppress_errors:
    pass


def msvc9_find_vcvarsall(version):
    """
    Patched "distutils.msvc9compiler.find_vcvarsall" to use the standalone
    compiler build for Python
    (VCForPython / Microsoft Visual C++ Compiler for Python 2.7).

    Fall back to original behavior when the standalone compiler is not
    available.

    Redirect the path of "vcvarsall.bat".

    Parameters
    ----------
    version: float
        Required Microsoft Visual C++ version.

    Return
    ------
    str
        vcvarsall.bat path
    """
    vc_base = r'Software\%sMicrosoft\DevDiv\VCForPython\%0.1f'
    key = vc_base % ('', version)
    try:
        # Per-user installs register the compiler path here
        productdir = Reg.get_value(key, "installdir")
    except KeyError:
        try:
            # All-user installs on a 64-bit system register here
            key = vc_base % ('Wow6432Node\\', version)
            productdir = Reg.get_value(key, "installdir")
        except KeyError:
            productdir = None

    if productdir:
        vcvarsall = join(productdir, "vcvarsall.bat")
        if isfile(vcvarsall):
            return vcvarsall

    return get_unpatched(msvc9_find_vcvarsall)(version)


def msvc9_query_vcvarsall(ver, arch='x86', *args, **kwargs):
    """
    Patched "distutils.msvc9compiler.query_vcvarsall" for support extra
    Microsoft Visual C++ 9.0 and 10.0 compilers.

    Set environment without use of "vcvarsall.bat".

    Parameters
    ----------
    ver: float
        Required Microsoft Visual C++ version.
    arch: str
        Target architecture.

    Return
    ------
    dict
        environment
    """
    # Try to get environment from vcvarsall.bat (Classical way)
    try:
        orig = get_unpatched(msvc9_query_vcvarsall)
        return orig(ver, arch, *args, **kwargs)
    except distutils.errors.DistutilsPlatformError:
        # Pass error if Vcvarsall.bat is missing
        pass
    except ValueError:
        # Pass error if environment not set after executing vcvarsall.bat
        pass

    # If error, try to set environment directly
    try:
        return EnvironmentInfo(arch, ver).return_env()
    except distutils.errors.DistutilsPlatformError as exc:
        _augment_exception(exc, ver, arch)
        raise


def _msvc14_find_vc2015():
    """Python 3.8 "distutils/_msvccompiler.py" backport"""
    try:
        key = winreg.OpenKey(