[issue27790] test_distutils spews linker messages on Windows

[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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resolution:  -> out of date
stage:  -> resolved
status: open -> closed

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[issue27790] test_distutils spews linker messages on Windows

[Terry J. Reedy]

Terry J. Reedy added the comment:

With the patch, I still see the Creating ... messages but without the LINK: 
warning.  It *seems* like a no-brainer to apply the patch. 

With those gone, it would seem reasonable to intercept the message as Steve 
described and only print it if it contains 'LINK' or if the test fails.

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[issue27790] test_distutils spews linker messages on Windows

[Segev Finer]

Changes by Segev Finer :


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pull_requests: +2866

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[issue27790] test_distutils spews linker messages on Windows

[Segev Finer]

Segev Finer added the comment:

Investigated some more. We are adding /GL for release but not in debug. But 
adding /LTCG for both debug and release.

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[issue27790] test_distutils spews linker messages on Windows

[Segev Finer]

Segev Finer added the comment:

We are getting those warnings because distutils builds extension modules 
without /GL (https://msdn.microsoft.com/en-us/library/0zza0de8.aspx) but with 
/LTCG (https://msdn.microsoft.com/en-us/library/xbf3tbeh.aspx). We should 
either add /GL to truly enable whole program optimizations/link-time code 
generation or remove it.

It is added in 
https://github.com/python/cpython/blob/896145d9d266ee2758cfcd7691238cbc1f9e1ab8/Lib/distutils/_msvccompiler.py#L233-L241.

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nosy: +Segev Finer
type:  -> behavior
versions: +Python 3.5, Python 3.6, Python 3.7

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[issue27790] test_distutils spews linker messages on Windows

[Steve Dower]

Steve Dower added the comment:

It certainly looks like more than we used to get...

Ideally we'd capture the output from the build process and only write it out if 
the test failed. I'm not entirely sure why that isn't happening here. The 
warnings themselves are harmless (you get a nearly identical warning if you 
*don't* put /LTCG on the command line and need it - I'd guess there was a 
stalemate between two factions on the compiler team at some point and they 
resolved it with this warning).

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[issue27790] test_distutils spews linker messages on Windows

[Terry J. Reedy]

New submission from Terry J. Reedy:

3.6, Win10, VS recently reinstalled to 'Update 3'.  I believe these messages 
are somewhat new.

0:01:00 [111/402] test_distutils failed (env changed)
xxmodule.c
   Creating library 
C:\Users\Terry\AppData\Local\Temp\tmpbjffnmc3\Debug\Users\Terry\AppData\Local\Temp\tmpbjffnmc3\xx_d.cp36-win32.lib
 and object 
C:\Users\Terry\AppData\Local\Temp\tmpbjffnmc3\Debug\Users\Terry\AppData\Local\Temp\tmpbjffnmc3\xx_d.cp36-win32.exp
LINK : /LTCG specified but no code generation required; remove /LTCG from the 
link command line to improve linker performance
foo.c
   Creating library 
C:\Users\Terry\AppData\Local\Temp\tmp7302jrpo\tempt\Users\Terry\AppData\Local\Temp\tmp9132twos\foo_d.cp36-win32.lib
 and object 
C:\Users\Terry\AppData\Local\Temp\tmp7302jrpo\tempt\Users\Terry\AppData\Local\Temp\tmp9132twos\foo_d.cp36-win32.exp
LINK : /LTCG specified but no code generation required; remove /LTCG from the 
link command line to improve linker performance
foo.c
   Creating library 
C:\Users\Terry\AppData\Local\Temp\tmp7302jrpo\tempt\Users\Terry\AppData\Local\Temp\tmp9132twos\foo_d.cp36-win32.lib
 and object 
C:\Users\Terry\AppData\Local\Temp\tmp7302jrpo\tempt\Users\Terry\AppData\Local\Temp\tmp9132twos\foo_d.cp36-win32.exp
LINK : /LTCG specified but no code generation required; remove /LTCG from the 
link command line to improve linker performance
xxmodule.c
   Creating library 
C:\Users\Terry\AppData\Local\Temp\tmp9hq4ci8e\Debug\Users\Terry\AppData\Local\Temp\tmp9hq4ci8e\xx_d.cp36-win32.lib
 and object 
C:\Users\Terry\AppData\Local\Temp\tmp9hq4ci8e\Debug\Users\Terry\AppData\Local\Temp\tmp9hq4ci8e\xx_d.cp36-win32.exp
LINK : /LTCG specified but no code generation required; remove /LTCG from the 
link command line to improve linker performance
foo.c
   Creating library 
C:\Users\Terry\AppData\Local\Temp\tmp3qv0ulce\tempt\Users\Terry\AppData\Local\Temp\tmph1jy_aqh\foo_d.cp36-win32.lib
 and object 
C:\Users\Terry\AppData\Local\Temp\tmp3qv0ulce\tempt\Users\Terry\AppData\Local\Temp\tmph1jy_aqh\foo_d.cp36-win32.exp
LINK : /LTCG specified but no code generation required; remove /LTCG from the 
link command line to improve linker performance
foo.c
   Creating library 
C:\Users\Terry\AppData\Local\Temp\tmp3qv0ulce\tempt\Users\Terry\AppData\Local\Temp\tmph1jy_aqh\foo_d.cp36-win32.lib
 and object 
C:\Users\Terry\AppData\Local\Temp\tmp3qv0ulce\tempt\Users\Terry\AppData\Local\Temp\tmph1jy_aqh\foo_d.cp36-win32.exp
LINK : /LTCG specified but no code generation required; remove /LTCG from the 
link command line to improve linker performance
xxmodule.c
   Creating library build\temp.win32-3.6-pydebug\Debug\xx_d.cp36-win32.lib and 
object build\temp.win32-3.6-pydebug\Debug\xx_d.cp36-win32.exp
LINK : /LTCG specified but no code generation required; remove /LTCG from the 
link command line to improve linker performance

F:\Python\dev\36\build\test_python_3596>exit 1

F:\Python\dev\36\build\test_python_3596>exit 0
Warning -- files was modified by test_distutils

--
components: Distutils, Tests, Windows
messages: 272991
nosy: dstufft, eric.araujo, haypo, paul.moore, steve.dower, terry.reedy, 
tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: test_distutils spews linker messages on Windows

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