It seems like the warnings come from test_distutils:
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0:05:09 [ 44/405] test_distutils failed (env changed) (38 sec)
xxmodule.c
xxmodule.obj : warning LNK4197: export 'PyInit_xx' specified multiple times; using first specification
Creating library D:\Temp\tmp_crvgs9y\Debug\Temp\tmp_crvgs9y\xx_d.cp37-win_amd64.lib and object D:\Temp\tmp_crvgs9y\Debug\Temp\tmp_crvgs9y\xx_d.cp37-win_amd64.exp
LINK : /LTCG specified but no code generation required; remove /LTCG from the link command line to improve linker performance
foo.c
Creating library D:\Temp\tmpnq__9cbm\tempt\Temp\tmpfv6uys06\foo_d.cp37-win_amd64.lib and object D:\Temp\tmpnq__9cbm\tempt\Temp\tmpfv6uys06\foo_d.cp37-win_amd64.exp
LINK : /LTCG specified but no code generation required; remove /LTCG from the link command line to improve linker performance
foo.c
Creating library D:\Temp\tmpnq__9cbm\tempt\Temp\tmpfv6uys06\foo_d.cp37-win_amd64.lib and object D:\Temp\tmpnq__9cbm\tempt\Temp\tmpfv6uys06\foo_d.cp37-win_amd64.exp
LINK : /LTCG specified but no code generation required; remove /LTCG from the link command line to improve linker performance
xxmodule.c
xxmodule.obj : warning LNK4197: export 'PyInit_xx' specified multiple times; using first specification
Creating library D:\Temp\tmp8n1b1bh8\Debug\Temp\tmp8n1b1bh8\xx_d.cp37-win_amd64.lib and object D:\Temp\tmp8n1b1bh8\Debug\Temp\tmp8n1b1bh8\xx_d.cp37-win_amd64.exp
LINK : /LTCG specified but no code generation required; remove /LTCG from the link command line to improve linker performance
foo.c
Creating library D:\Temp\tmpk47tprte\tempt\Temp\tmpe3sksr_y\foo_d.cp37-win_amd64.lib and object D:\Temp\tmpk47tprte\tempt\Temp\tmpe3sksr_y\foo_d.cp37-win_amd64.exp
LINK : /LTCG specified but no code generation required; remove /LTCG from the link command line to improve linker performance
foo.c
Creating library D:\Temp\tmpk47tprte\tempt\Temp\tmpe3sksr_y\foo_d.cp37-win_amd64.lib and object D:\Temp\tmpk47tprte\tempt\Temp\tmpe3sksr_y\foo_d.cp37-win_amd64.exp
LINK : /LTCG specified but no code generation required; remove /LTCG from the link command line to improve linker performance
xxmodule.c
xxmodule.obj : warning LNK4197: export 'PyInit_xx' specified multiple times; using first specification
Creating library build\temp.win-amd64-3.7-pydebug\Debug\xx_d.cp37-win_amd64.lib and object build\temp.win-amd64-3.7-pydebug\Debug\xx_d.cp37-win_amd64.exp
LINK : /LTCG specified but no code generation required; remove /LTCG from the link command line to improve linker performance
D:\buildarea\3.x.bolen-windows8\build\build\test_python_3476>exit 1
D:\buildarea\3.x.bolen-windows8\build\build\test_python_3476>exit 0
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By the way, test_distutils failed because of "env changed" but the changed environment is not logged :-( See my related issue #27829 for the missing warning.
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