[3.10] gh-76773: Update docs mentioning no-longer-supported Windows versions & features (GH-92529) (GH-92609)

(cherry picked from commit f1bbcba74f)


Co-authored-by: CAM Gerlach <CAM.Gerlach@Gerlach.CAM>

Automerge-Triggered-By: GH:serhiy-storchaka
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9 changed files with 70 additions and 115 deletions

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@ -106,8 +106,7 @@ Using DLLs in Practice
Windows Python is built in Microsoft Visual C++; using other compilers may or Windows Python is built in Microsoft Visual C++; using other compilers may or
may not work (though Borland seems to). The rest of this section is MSVC++ may not work. The rest of this section is MSVC++ specific.
specific.
When creating DLLs in Windows, you must pass :file:`pythonXY.lib` to the linker. When creating DLLs in Windows, you must pass :file:`pythonXY.lib` to the linker.
To build two DLLs, spam and ni (which uses C functions found in spam), you could To build two DLLs, spam and ni (which uses C functions found in spam), you could
@ -134,4 +133,3 @@ Developer Studio will throw in a lot of import libraries that you do not really
need, adding about 100K to your executable. To get rid of them, use the Project need, adding about 100K to your executable. To get rid of them, use the Project
Settings dialog, Link tab, to specify *ignore default libraries*. Add the Settings dialog, Link tab, to specify *ignore default libraries*. Add the
correct :file:`msvcrtxx.lib` to the list of libraries. correct :file:`msvcrtxx.lib` to the list of libraries.

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@ -26,8 +26,8 @@ with running programs from the Windows command line then everything will seem
obvious; otherwise, you might need a little more guidance. obvious; otherwise, you might need a little more guidance.
Unless you use some sort of integrated development environment, you will end up Unless you use some sort of integrated development environment, you will end up
*typing* Windows commands into what is variously referred to as a "DOS window" *typing* Windows commands into what is referred to as a
or "Command prompt window". Usually you can create such a window from your "Command prompt window". Usually you can create such a window from your
search bar by searching for ``cmd``. You should be able to recognize search bar by searching for ``cmd``. You should be able to recognize
when you have started such a window because you will see a Windows "command when you have started such a window because you will see a Windows "command
prompt", which usually looks like this: prompt", which usually looks like this:
@ -186,9 +186,6 @@ Embedding the Python interpreter in a Windows app can be summarized as follows:
by the Windows ``GetProcAddress()`` routine. Macros can make using these by the Windows ``GetProcAddress()`` routine. Macros can make using these
pointers transparent to any C code that calls routines in Python's C API. pointers transparent to any C code that calls routines in Python's C API.
Borland note: convert :file:`python{NN}.lib` to OMF format using Coff2Omf.exe
first.
.. XXX what about static linking? .. XXX what about static linking?
2. If you use SWIG, it is easy to create a Python "extension module" that will 2. If you use SWIG, it is easy to create a Python "extension module" that will
@ -279,4 +276,3 @@ How do I check for a keypress without blocking?
Use the :mod:`msvcrt` module. This is a standard Windows-specific extension module. Use the :mod:`msvcrt` module. This is a standard Windows-specific extension module.
It defines a function ``kbhit()`` which checks whether a keyboard hit is It defines a function ``kbhit()`` which checks whether a keyboard hit is
present, and ``getch()`` which gets one character without echoing it. present, and ``getch()`` which gets one character without echoing it.

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@ -1361,10 +1361,6 @@ way is to instantiate one of the following classes:
functions in these libraries use the ``stdcall`` calling convention, and are functions in these libraries use the ``stdcall`` calling convention, and are
assumed to return :c:type:`int` by default. assumed to return :c:type:`int` by default.
On Windows CE only the standard calling convention is used, for convenience the
:class:`WinDLL` and :class:`OleDLL` use the standard calling convention on this
platform.
The Python :term:`global interpreter lock` is released before calling any The Python :term:`global interpreter lock` is released before calling any
function exported by these libraries, and reacquired afterwards. function exported by these libraries, and reacquired afterwards.
@ -1665,8 +1661,7 @@ See :ref:`ctypes-callback-functions` for examples.
.. function:: WINFUNCTYPE(restype, *argtypes, use_errno=False, use_last_error=False) .. function:: WINFUNCTYPE(restype, *argtypes, use_errno=False, use_last_error=False)
Windows only: The returned function prototype creates functions that use the Windows only: The returned function prototype creates functions that use the
``stdcall`` calling convention, except on Windows CE where ``stdcall`` calling convention. The function will
:func:`WINFUNCTYPE` is the same as :func:`CFUNCTYPE`. The function will
release the GIL during the call. *use_errno* and *use_last_error* have the release the GIL during the call. *use_errno* and *use_last_error* have the
same meaning as above. same meaning as above.

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@ -131,7 +131,7 @@ option
These option syntaxes are not supported by :mod:`optparse`, and they never These option syntaxes are not supported by :mod:`optparse`, and they never
will be. This is deliberate: the first three are non-standard on any will be. This is deliberate: the first three are non-standard on any
environment, and the last only makes sense if you're exclusively targeting environment, and the last only makes sense if you're exclusively targeting
VMS, MS-DOS, and/or Windows. Windows or certain legacy platforms (e.g. VMS, MS-DOS).
option argument option argument
an argument that follows an option, is closely associated with that option, an argument that follows an option, is closely associated with that option,

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@ -5,7 +5,7 @@
:synopsis: Operations on pathnames. :synopsis: Operations on pathnames.
**Source code:** :source:`Lib/posixpath.py` (for POSIX) and **Source code:** :source:`Lib/posixpath.py` (for POSIX) and
:source:`Lib/ntpath.py` (for Windows NT). :source:`Lib/ntpath.py` (for Windows).
.. index:: single: path; operations .. index:: single: path; operations

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@ -84,7 +84,7 @@ The module defines the following user-callable items:
file-like object. Whether the name can be file-like object. Whether the name can be
used to open the file a second time, while the named temporary file is used to open the file a second time, while the named temporary file is
still open, varies across platforms (it can be so used on Unix; it cannot still open, varies across platforms (it can be so used on Unix; it cannot
on Windows NT or later). If *delete* is true (the default), the file is on Windows). If *delete* is true (the default), the file is
deleted as soon as it is closed. deleted as soon as it is closed.
The returned object is always a file-like object whose :attr:`!file` The returned object is always a file-like object whose :attr:`!file`
attribute is the underlying true file object. This file-like object can attribute is the underlying true file object. This file-like object can

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@ -374,7 +374,9 @@ may be changed from ``.``, and the package will be installed into a
subdirectory. By default, the subdirectory is named the same as the package, subdirectory. By default, the subdirectory is named the same as the package,
and without the ``-ExcludeVersion`` option this name will include the specific and without the ``-ExcludeVersion`` option this name will include the specific
version installed. Inside the subdirectory is a ``tools`` directory that version installed. Inside the subdirectory is a ``tools`` directory that
contains the Python installation:: contains the Python installation:
.. code-block:: doscon
# Without -ExcludeVersion # Without -ExcludeVersion
> .\python.3.5.2\tools\python.exe -V > .\python.3.5.2\tools\python.exe -V
@ -421,7 +423,7 @@ dependants, such as Idle), pip and the Python documentation are not included.
.. note:: .. note::
The embedded distribution does not include the `Microsoft C Runtime The embedded distribution does not include the `Microsoft C Runtime
<https://www.microsoft.com/en-us/download/details.aspx?id=48145>`_ and it is <https://docs.microsoft.com/en-US/cpp/windows/latest-supported-vc-redist#visual-studio-2015-2017-2019-and-2022>`_ and it is
the responsibility of the application installer to provide this. The the responsibility of the application installer to provide this. The
runtime may have already been installed on a user's system previously or runtime may have already been installed on a user's system previously or
automatically via Windows Update, and can be detected by finding automatically via Windows Update, and can be detected by finding
@ -555,27 +557,22 @@ System variables, you need non-restricted access to your machine
Windows will concatenate User variables *after* System variables, which may Windows will concatenate User variables *after* System variables, which may
cause unexpected results when modifying :envvar:`PATH`. cause unexpected results when modifying :envvar:`PATH`.
The :envvar:`PYTHONPATH` variable is used by all versions of Python 2 and The :envvar:`PYTHONPATH` variable is used by all versions of Python,
Python 3, so you should not permanently configure this variable unless it so you should not permanently configure it unless the listed paths
only includes code that is compatible with all of your installed Python only include code that is compatible with all of your installed Python
versions. versions.
.. seealso:: .. seealso::
https://www.microsoft.com/en-us/wdsi/help/folder-variables https://docs.microsoft.com/en-us/windows/win32/procthread/environment-variables
Environment variables in Windows NT Overview of environment variables on Windows
https://technet.microsoft.com/en-us/library/cc754250.aspx https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/set_1
The SET command, for temporarily modifying environment variables The ``set`` command, for temporarily modifying environment variables
https://technet.microsoft.com/en-us/library/cc755104.aspx https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/setx
The SETX command, for permanently modifying environment variables The ``setx`` command, for permanently modifying environment variables
https://support.microsoft.com/en-us/help/310519/how-to-manage-environment-variables-in-windows-xp
How To Manage Environment Variables in Windows XP
https://www.chem.gla.ac.uk/~louis/software/faq/q1.html
Setting Environment variables, Louis J. Farrugia
.. _windows-path-mod: .. _windows-path-mod:
@ -673,9 +670,7 @@ From the command-line
System-wide installations of Python 3.3 and later will put the launcher on your System-wide installations of Python 3.3 and later will put the launcher on your
:envvar:`PATH`. The launcher is compatible with all available versions of :envvar:`PATH`. The launcher is compatible with all available versions of
Python, so it does not matter which version is installed. To check that the Python, so it does not matter which version is installed. To check that the
launcher is available, execute the following command in Command Prompt: launcher is available, execute the following command in Command Prompt::
::
py py
@ -683,26 +678,20 @@ You should find that the latest version of Python you have installed is
started - it can be exited as normal, and any additional command-line started - it can be exited as normal, and any additional command-line
arguments specified will be sent directly to Python. arguments specified will be sent directly to Python.
If you have multiple versions of Python installed (e.g., 2.7 and |version|) you If you have multiple versions of Python installed (e.g., 3.7 and |version|) you
will have noticed that Python |version| was started - to launch Python 2.7, try will have noticed that Python |version| was started - to launch Python 3.7, try
the command: the command::
:: py -3.7
py -2.7 If you want the latest version of Python 2 you have installed, try the
command::
If you want the latest version of Python 2.x you have installed, try the
command:
::
py -2 py -2
You should find the latest version of Python 2.x starts. You should find the latest version of Python 3.x starts.
If you see the following error, you do not have the launcher installed: If you see the following error, you do not have the launcher installed::
::
'py' is not recognized as an internal or external command, 'py' is not recognized as an internal or external command,
operable program or batch file. operable program or batch file.
@ -710,11 +699,11 @@ If you see the following error, you do not have the launcher installed:
Per-user installations of Python do not add the launcher to :envvar:`PATH` Per-user installations of Python do not add the launcher to :envvar:`PATH`
unless the option was selected on installation. unless the option was selected on installation.
:: The command::
py --list py --list
You should see the currently installed versions of Python. displays the currently installed version(s) of Python.
Virtual environments Virtual environments
^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^
@ -740,9 +729,7 @@ following contents
import sys import sys
sys.stdout.write("hello from Python %s\n" % (sys.version,)) sys.stdout.write("hello from Python %s\n" % (sys.version,))
From the directory in which hello.py lives, execute the command: From the directory in which hello.py lives, execute the command::
::
py hello.py py hello.py
@ -755,9 +742,9 @@ is printed. Now try changing the first line to be:
Re-executing the command should now print the latest Python 3.x information. Re-executing the command should now print the latest Python 3.x information.
As with the above command-line examples, you can specify a more explicit As with the above command-line examples, you can specify a more explicit
version qualifier. Assuming you have Python 2.6 installed, try changing the version qualifier. Assuming you have Python 3.7 installed, try changing
first line to ``#! python2.6`` and you should find the 2.6 version the first line to ``#! python3.7`` and you should find the |version|
information printed. version information printed.
Note that unlike interactive use, a bare "python" will use the latest Note that unlike interactive use, a bare "python" will use the latest
version of Python 2.x that you have installed. This is for backward version of Python 2.x that you have installed. This is for backward
@ -810,8 +797,8 @@ shebang lines starting with ``/usr``.
Any of the above virtual commands can be suffixed with an explicit version Any of the above virtual commands can be suffixed with an explicit version
(either just the major version, or the major and minor version). (either just the major version, or the major and minor version).
Furthermore the 32-bit version can be requested by adding "-32" after the Furthermore the 32-bit version can be requested by adding "-32" after the
minor version. I.e. ``/usr/bin/python2.7-32`` will request usage of the minor version. I.e. ``/usr/bin/python3.7-32`` will request usage of the
32-bit python 2.7. 32-bit python 3.7.
.. versionadded:: 3.7 .. versionadded:: 3.7
@ -897,19 +884,19 @@ Examples:
``python2`` will use the latest Python 2.x version installed and ``python2`` will use the latest Python 2.x version installed and
the command ``python3`` will use the latest Python 3.x installed. the command ``python3`` will use the latest Python 3.x installed.
* The commands ``python3.1`` and ``python2.7`` will not consult any * The command ``python3.7`` will not consult any
options at all as the versions are fully specified. options at all as the versions are fully specified.
* If ``PY_PYTHON=3``, the commands ``python`` and ``python3`` will both use * If ``PY_PYTHON=3``, the commands ``python`` and ``python3`` will both use
the latest installed Python 3 version. the latest installed Python 3 version.
* If ``PY_PYTHON=3.1-32``, the command ``python`` will use the 32-bit * If ``PY_PYTHON=3.7-32``, the command ``python`` will use the 32-bit
implementation of 3.1 whereas the command ``python3`` will use the latest implementation of 3.7 whereas the command ``python3`` will use the latest
installed Python (PY_PYTHON was not considered at all as a major installed Python (PY_PYTHON was not considered at all as a major
version was specified.) version was specified.)
* If ``PY_PYTHON=3`` and ``PY_PYTHON3=3.1``, the commands * If ``PY_PYTHON=3`` and ``PY_PYTHON3=3.7``, the commands
``python`` and ``python3`` will both use specifically 3.1 ``python`` and ``python3`` will both use specifically 3.7
In addition to environment variables, the same settings can be configured In addition to environment variables, the same settings can be configured
in the .INI file used by the launcher. The section in the INI file is in the .INI file used by the launcher. The section in the INI file is
@ -920,21 +907,21 @@ an environment variable will override things specified in the INI file.
For example: For example:
* Setting ``PY_PYTHON=3.1`` is equivalent to the INI file containing: * Setting ``PY_PYTHON=3.7`` is equivalent to the INI file containing:
.. code-block:: ini .. code-block:: ini
[defaults] [defaults]
python=3.1 python=3.7
* Setting ``PY_PYTHON=3`` and ``PY_PYTHON3=3.1`` is equivalent to the INI file * Setting ``PY_PYTHON=3`` and ``PY_PYTHON3=3.7`` is equivalent to the INI file
containing: containing:
.. code-block:: ini .. code-block:: ini
[defaults] [defaults]
python=3 python=3
python3=3.1 python3=3.7
Diagnostics Diagnostics
----------- -----------
@ -1088,13 +1075,14 @@ is a collection of modules for advanced Windows-specific support. This includes
utilities for: utilities for:
* `Component Object Model * `Component Object Model
<https://docs.microsoft.com/en-us/windows/desktop/com/component-object-model--com--portal>`_ <https://docs.microsoft.com/en-us/windows/win32/com/component-object-model--com--portal>`_
(COM) (COM)
* Win32 API calls * Win32 API calls
* Registry * Registry
* Event log * Event log
* `Microsoft Foundation Classes <https://msdn.microsoft.com/en-us/library/fe1cf721%28VS.80%29.aspx>`_ (MFC) * `Microsoft Foundation Classes
user interfaces <https://docs.microsoft.com/en-us/cpp/mfc/mfc-desktop-applications>`_
(MFC) user interfaces
`PythonWin <https://web.archive.org/web/20060524042422/ `PythonWin <https://web.archive.org/web/20060524042422/
https://www.python.org/windows/pythonwin/>`_ is a sample MFC application https://www.python.org/windows/pythonwin/>`_ is a sample MFC application
@ -1105,7 +1093,7 @@ shipped with PyWin32. It is an embeddable IDE with a built-in debugger.
`Win32 How Do I...? <http://timgolden.me.uk/python/win32_how_do_i.html>`_ `Win32 How Do I...? <http://timgolden.me.uk/python/win32_how_do_i.html>`_
by Tim Golden by Tim Golden
`Python and COM <http://www.boddie.org.uk/python/COM.html>`_ `Python and COM <https://www.boddie.org.uk/python/COM.html>`_
by David and Paul Boddie by David and Paul Boddie
@ -1119,18 +1107,6 @@ you can distribute your application without requiring your users to install
Python. Python.
WConio
------
Since Python's advanced terminal handling layer, :mod:`curses`, is restricted to
Unix-like systems, there is a library exclusive to Windows as well: Windows
Console I/O for Python.
`WConio <http://newcenturycomputers.net/projects/wconio.html>`_ is a wrapper for
Turbo-C's :file:`CONIO.H`, used to create text user interfaces.
Compiling Python on Windows Compiling Python on Windows
=========================== ===========================
@ -1140,21 +1116,13 @@ latest release's source or just grab a fresh `checkout
<https://devguide.python.org/setup/#getting-the-source-code>`_. <https://devguide.python.org/setup/#getting-the-source-code>`_.
The source tree contains a build solution and project files for Microsoft The source tree contains a build solution and project files for Microsoft
Visual Studio 2015, which is the compiler used to build the official Python Visual Studio, which is the compiler used to build the official Python
releases. These files are in the :file:`PCbuild` directory. releases. These files are in the :file:`PCbuild` directory.
Check :file:`PCbuild/readme.txt` for general information on the build process. Check :file:`PCbuild/readme.txt` for general information on the build process.
For extension modules, consult :ref:`building-on-windows`. For extension modules, consult :ref:`building-on-windows`.
.. seealso::
`Python + Windows + distutils + SWIG + gcc MinGW <http://sebsauvage.net/python/mingw.html>`_
or "Creating Python extensions in C/C++ with SWIG and compiling them with
MinGW gcc under Windows" or "Installing Python extension with distutils
and without Microsoft Visual C++" by Sébastien Sauvage, 2003
Other Platforms Other Platforms
=============== ===============
@ -1163,12 +1131,12 @@ With ongoing development of Python, some platforms that used to be supported
earlier are no longer supported (due to the lack of users or developers). earlier are no longer supported (due to the lack of users or developers).
Check :pep:`11` for details on all unsupported platforms. Check :pep:`11` for details on all unsupported platforms.
* `Windows CE <http://pythonce.sourceforge.net/>`_ is still supported. * `Windows CE <http://pythonce.sourceforge.net/>`_ is
* The `Cygwin <https://cygwin.com/>`_ installer offers to install the Python `no longer supported <https://github.com/python/cpython/issues/71542>`__
interpreter as well (cf. `Cygwin package source since Python 3 (if it ever was).
<ftp://ftp.uni-erlangen.de/pub/pc/gnuwin32/cygwin/mirrors/cygnus/ * The `Cygwin <https://cygwin.com/>`_ installer offers to install the
release/python>`_, `Maintainer releases `Python interpreter <https://cygwin.com/packages/summary/python3.html>`__
<http://www.tishler.net/jason/software/python/>`_) as well
See `Python for Windows <https://www.python.org/downloads/windows/>`_ See `Python for Windows <https://www.python.org/downloads/windows/>`_
for detailed information about platforms with pre-compiled installers. for detailed information about platforms with pre-compiled installers.

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@ -18,7 +18,7 @@ All PC ports use this scheme to try to set up a module search path:
1) The script location; the current directory without script. 1) The script location; the current directory without script.
2) The PYTHONPATH variable, if set. 2) The PYTHONPATH variable, if set.
3) For Win32 platforms (NT/95), paths specified in the Registry. 3) Paths specified in the Registry.
4) Default directories lib, lib/win, lib/test, lib/tkinter; 4) Default directories lib, lib/win, lib/test, lib/tkinter;
these are searched relative to the environment variable these are searched relative to the environment variable
PYTHONHOME, if set, or relative to the executable and its PYTHONHOME, if set, or relative to the executable and its
@ -26,8 +26,8 @@ All PC ports use this scheme to try to set up a module search path:
or the current directory (not useful). or the current directory (not useful).
5) The directory containing the executable. 5) The directory containing the executable.
The best installation strategy is to put the Python executable (and The best installation strategy is to put the Python executable and
DLL, for Win32 platforms) in some convenient directory such as DLL in some convenient directory such as
C:/python, and copy all library files and subdirectories (using XCOPY) C:/python, and copy all library files and subdirectories (using XCOPY)
to C:/python/lib. Then you don't need to set PYTHONPATH. Otherwise, to C:/python/lib. Then you don't need to set PYTHONPATH. Otherwise,
set the environment variable PYTHONPATH to your Python search path. set the environment variable PYTHONPATH to your Python search path.

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@ -13,12 +13,10 @@ Quick Start Guide
Building Python using Microsoft Visual C++ Building Python using Microsoft Visual C++
------------------------------------------ ------------------------------------------
This directory is used to build CPython for Microsoft Windows NT version This directory is used to build CPython for Microsoft Windows on 32- and 64-
6.0 or higher (Windows Vista, Windows Server 2008, or later) on 32 and 64
bit platforms. Using this directory requires an installation of bit platforms. Using this directory requires an installation of
Microsoft Visual Studio 2017 (MSVC 14.1) with the *Python workload* and Microsoft Visual Studio (MSVC) with the *Python workload* and
its optional *Python native development* component selected. (For its optional *Python native development* component selected.
command-line builds, Visual Studio 2015 may also be used.)
Building from the command line is recommended in order to obtain any Building from the command line is recommended in order to obtain any
external dependencies. To build, simply run the "build.bat" script without external dependencies. To build, simply run the "build.bat" script without
@ -105,7 +103,7 @@ pythonw
Prompt window Prompt window
pylauncher pylauncher
py.exe, the Python Launcher for Windows, see py.exe, the Python Launcher for Windows, see
http://docs.python.org/3/using/windows.html#launcher https://docs.python.org/3/using/windows.html#launcher
pywlauncher pywlauncher
pyw.exe, a variant of py.exe that doesn't open a Command Prompt pyw.exe, a variant of py.exe that doesn't open a Command Prompt
window window
@ -167,14 +165,14 @@ _bz2
_lzma _lzma
Python wrapper for version 5.2.2 of the liblzma compression library Python wrapper for version 5.2.2 of the liblzma compression library
Homepage: Homepage:
http://tukaani.org/xz/ https://tukaani.org/xz/
_ssl _ssl
Python wrapper for version 1.1.1k of the OpenSSL secure sockets Python wrapper for version 1.1.1k of the OpenSSL secure sockets
library, which is downloaded from our binaries repository at library, which is downloaded from our binaries repository at
https://github.com/python/cpython-bin-deps. https://github.com/python/cpython-bin-deps.
Homepage: Homepage:
http://www.openssl.org/ https://www.openssl.org/
Building OpenSSL requires Perl on your path, and can be performed by Building OpenSSL requires Perl on your path, and can be performed by
running PCbuild\prepare_ssl.bat. This will retrieve the version of running PCbuild\prepare_ssl.bat. This will retrieve the version of
@ -190,14 +188,14 @@ _ssl
_sqlite3 _sqlite3
Wraps SQLite 3.37.2, which is itself built by sqlite3.vcxproj Wraps SQLite 3.37.2, which is itself built by sqlite3.vcxproj
Homepage: Homepage:
http://www.sqlite.org/ https://www.sqlite.org/
_tkinter _tkinter
Wraps version 8.6.6 of the Tk windowing system, which is downloaded Wraps version 8.6.6 of the Tk windowing system, which is downloaded
from our binaries repository at from our binaries repository at
https://github.com/python/cpython-bin-deps. https://github.com/python/cpython-bin-deps.
Homepage: Homepage:
http://www.tcl.tk/ https://www.tcl.tk/
Building Tcl and Tk can be performed by running Building Tcl and Tk can be performed by running
PCbuild\prepare_tcltk.bat. This will retrieve the version of the PCbuild\prepare_tcltk.bat. This will retrieve the version of the
@ -256,7 +254,7 @@ It creates the PGI files, runs the unit test suite or PyBench with the
PGI python, and finally creates the optimized files. PGI python, and finally creates the optimized files.
See See
http://msdn.microsoft.com/en-us/library/e7k32f4k(VS.140).aspx https://docs.microsoft.com/en-us/cpp/build/profile-guided-optimizations
for more on this topic. for more on this topic.