[issue2943] Distutils should generate a better error message when the SDK is not installed

[Steve Dower]

Steve Dower  added the comment:

Distutils is now deprecated (see PEP 632) and all tagged issues are being 
closed. From now until removal, only release blocking issues will be considered 
for distutils.

If this issue does not relate to distutils, please remove the component and 
reopen it. If you believe it still requires a fix, most likely the issue should 
be re-reported at https://github.com/pypa/setuptools

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[issue2943] Distutils should generate a better error message when the SDK is not installed

[Ivan Pozdeev]

Ivan Pozdeev added the comment:

What's wrong with the Python wiki link in msg263206 above? It is supposed to be 
_the_ guide for setting up compilers in Windows, isn't it?

Ideally, this should be a link to `distutils' docs - because, you know, the 
wiki isn't carved in stone, either, while the docs for the specific version are 
bundled with it.

Actually, `distutils' does have an entry on `distutils.msvccompiler': 
https://docs.python.org/2/distutils/apiref.html#module-distutils.msvccompiler . 
It even documents the use of DUSTUTILS_USE_SDK variable!
The wording could use some clarification and maybe a link to wiki, but that's 
for another ticket.

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[issue2943] Distutils should generate a better error message when the SDK is not installed

[STINNER Victor]

STINNER Victor added the comment:

Maybe we can add an entry to the Python FAQ, use this link and then add a
link to the Microsoft article.

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[issue2943] Distutils should generate a better error message when the SDK is not installed

[Ivan Pozdeev]

Ivan Pozdeev added the comment:

@haypo, as I said, it's undesirable to link to a 3rd party site in a built-in 
error message because its availability and content are outside the dev team's 
control.

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[issue2943] Distutils should generate a better error message when the SDK is not installed

[STINNER Victor]

STINNER Victor added the comment:

Idea: add a link to this article:
https://aka.ms/vcpython
or full link: 
https://blogs.msdn.microsoft.com/pythonengineering/2016/04/11/unable-to-find-vcvarsall-bat/

Related tweet from Steve Dower:
https://twitter.com/zooba/status/791032320006328320

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[issue2943] Distutils should generate a better error message when the SDK is not installed

[Vivek Karumudi]

Vivek Karumudi added the comment:

I cannot understand the cryptic message could you please change it to something 
meaningful for "Unable to find vcvarsall.bat"

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[issue2943] Distutils should generate a better error message when the SDK is not installed

[Ivan Pozdeev]

Ivan Pozdeev added the comment:

The vsvarsall.bat message should direct to 
https://wiki.python.org/moin/WindowsCompilers rather than some 3rd-party site 
(even more so, one with user-generated content like SO).

E.g.: "Unable to find vcvarsall.bat. A required version of MS VC++ compilers is 
not installed or used improperly. See 
https://wiki.python.org/moin/WindowsCompilers for instructions."

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[issue2943] Distutils should generate a better error message when the SDK is not installed

[STINNER Victor]

Changes by STINNER Victor :


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[issue2943] Distutils should generate a better error message when the SDK is not installed

[Mark Lawrence]

Changes by Mark Lawrence :


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[issue2943] Distutils should generate a better error message when the SDK is not installed

[Karl Stahl]

Changes by Karl Stahl :


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[issue2943] Distutils should generate a better error message when the SDK is not installed

[Ilya Kamenshchikov]

Ilya Kamenshchikov added the comment:

please fix spent half a day to understand I need C compiler

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[issue2943] Distutils should generate a better error message when the SDK is not installed

[Ralf Gommers]

Changes by Ralf Gommers ralf.gomm...@gmail.com:


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[issue2943] Distutils should generate a better error message when the SDK is not installed

[Steven Samuel Cole]

Changes by Steven Samuel Cole steven.samuel.c...@gmail.com:


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[issue2943] Distutils should generate a better error message when the SDK is not installed

[Antoine Pitrou]

Changes by Antoine Pitrou pit...@free.fr:


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[issue2943] Distutils should generate a better error message when the SDK is not installed

[John]

John added the comment:

error message should contain more details about what went wrong and why

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[issue2943] Distutils should generate a better error message when the SDK is not installed

[Piotr Dobrogost]

Changes by Piotr Dobrogost p...@bugs.python.dobrogost.net:


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[issue2943] Distutils should generate a better error message when the SDK is not installed

[Terry J. Reedy]

Changes by Terry J. Reedy tjre...@udel.edu:


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[issue2943] Distutils should generate a better error message when the SDK is not installed

[Martin Dengler]

Changes by Martin Dengler mar...@martindengler.com:


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[issue2943] Distutils should generate a better error message when the SDK is not installed

[pokeeffe]

Changes by pokeeffe launch...@pokeeffe.net:


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[issue2943] Distutils should generate a better error message when the SDK is not installed

[Lars H]

Lars H added the comment:

+1 vote for fixing this problem. Matt Hickford said it very well... the error 
message is very cryptic, not giving the user a clue as to what domain the 
problem lies in.

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[issue2943] Distutils should generate a better error message when the SDK is not installed

[Mark Lawrence]

Mark Lawrence added the comment:

@Steve could this be included with the work you're doing with the Windows 
installers?

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[issue2943] Distutils should generate a better error message when the SDK is not installed

[Steve Dower]

Steve Dower added the comment:

I can certainly improve this for 3.5 as part of the move to VC14 (which will 
require changes to distutils anyway). The installer won't touch it.

For earlier Python versions, I'd quite like to see setuptools take over 
detection from distutils and provide the better error message. I have some 
other work going on (currently, mostly, still in secret) that may help here, so 
I may be the one to contribute it to setuptools too if things go well.

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[issue2943] Distutils should generate a better error message when the SDK is not installed

[Mark Lawrence]

Changes by Mark Lawrence breamore...@yahoo.co.uk:


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[issue2943] Distutils should generate a better error message when the SDK is not installed

[Mark Lawrence]

Mark Lawrence added the comment:

How about Error: vcvarsall.bat not found - VC++ not installed or wrong 
version ?

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[issue2943] Distutils should generate a better error message when the SDK is not installed

[Holger Waldmann]

Holger Waldmann added the comment:

On Python 3.3.3 it is even worse.
I am using Python 3.3.3 (32bit) on Windows 7 (64bit).
Visual Studio C++ 2008 Express Edition is properly installed.

Note: I use Python 32bit because Visual Studio C++ 2008 Express Edition 
includes only the 32bit compiler.

Using Google I did find the instructions on 
http://stackoverflow.com/q/2817869/284795
But they were of no help.

There are two problems that are not addressed.

Problem #1:
distutils/msvc9compiler.py decides to look for the 32bit registry key (because 
it is a 32bit Python) but it should look for the 64bit registry key (because it 
is a 64bit Windows).

Problem #2:
distutils/msvc9compiler.py decides to look for VERSION=10
I did some reverse engineering on the module to find this information.
Why is this not documented?

After setting VS100COMNTOOLS=%VS90COMNTOOLS% everything worked fine.

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[issue2943] Distutils should generate a better error message when the SDK is not installed

[Matt Hickford]

Matt Hickford added the comment:

For comparison, Ruby ships with a package manager, Gem. If a user tries to 
install a package with C extensions, they are given this user-friendly message:

 Please update your PATH to include build tools or download the DevKit from 
 'http://rubyinstaller.org/downloads' and follow the instructions at 
 'http://github.com/oneclick/rubyinstaller/wiki/Development-Kit'

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[issue2943] Distutils should generate a better error message when the SDK is not installed

[Matt Hickford]

Matt Hickford added the comment:

( Upstreamed from Pip https://github.com/pypa/pip/issues/942 )

There are lot of Python users on Windows. If they succeed in installing a 
package manager (a struggle), this is typically their first experience with it

$ pip install numpy

blah blah blah

Error: Unable to find vcvarsall.bat

The misery is compounded by the cryptic error message. They don't know whether 
the problem with their computer, the specific package, or pip generally. Let 
alone how to fix it.

You and I know this happens because the package install involves building some 
C code from source and the user doesn't have a C compiler installed. The fix is 
to install mingw32 (or Visual Studio) and edit distutils.cfg to specify to use 
that compiler. 

Thus, it would be really helpful to print a message after 'error: unable to 
find vcvarsall.bat' such as

 Installing this package requires a C compiler. To fix this error, follow 
 http://stackoverflow.com/q/2817869/284795

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[issue2943] Distutils should generate a better error message when the SDK is not installed

[Ned Jackson Lovely]

Ned Jackson Lovely added the comment:

Improved msg per discussion.

I don't see how to test this without messing with the windows registry. I am 
deeply reluctant to do that.

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Added file: http://bugs.python.org/file29450/issue2943.diff

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[issue2943] Distutils should generate a better error message when the SDK is not installed

[Cournapeau David]

Cournapeau David da...@ar.media.kyoto-u.ac.jp added the comment:

Hi tarek,

I can't say for sure about the only part. My experience on windows is
that there are so many possible combinations that getting it right is
difficult.

But in any case, the raised exception is not helpful. I am a developer
and familiar with distutils, and I could not make any sense of the
message. If the cause cannot be determined, at least a message like
Unexpected result while detecting MS toolchain (str(result) vs
str(interesting) would be helpful I think.

Also, but I am not 100 % sure about this, I believe any exception raised
within distutils should be inherited from DistutilsError

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[issue2943] Distutils should generate a better error message when the SDK is not installed

[Tarek Ziadé]

Tarek Ziadé ziade.ta...@gmail.com added the comment:

Does it mean you won't get the settings for include, lib, libpath
and path when you call vcvarsall.bat *only* of the SDK is not
installed, or can't we have other cases ?

If the latter is true, maybe a better formatted Error message where
we list founded values and the list of missing values.

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[issue2943] Distutils should generate a better error message when the SDK is not installed

[Tarek Ziadé]

Changes by Tarek Ziadé ziade.ta...@gmail.com:


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type:  - behavior
versions: +Python 2.7, Python 3.1

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[issue2943] Distutils should generate a better error message when the SDK is not installed

[Cournapeau David]

New submission from Cournapeau David [EMAIL PROTECTED]:

I tried to build some extensions with python 2.6 (built from sources
with VS 2008 express), and got some errors in the function
query_vcvarsall. The offending lines are:

if len(result) != len(interesting):
raise ValueError(str(list(result.keys(

I got a value error here. After some investigation, I realized that it
was because I did not install the SDK. I think the error message could
be isgnificantly improved if installing the SDK was suggested in the
exception message.

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messages: 67187
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severity: normal
status: open
title: Distutils should generate a better error message when the SDK is not 
installed

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