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From: David Abrahams (dave_at_[hidden])
Date: 2006-02-10 13:26:55

David Abrahams <dave_at_[hidden]> writes:

> Vladimir Prus <ghost_at_[hidden]> writes:
>> On Friday 27 January 2006 19:36, David Abrahams wrote:
>>> "Reece Dunn" <msclrhd_at_[hidden]> writes:
>>> > David Abrahams wrote:
>>> >>I get loads of warnings when compiling with msvc with warnings=off
>>> >
>>> > warnings=off is using the /W0 flag which is what the visual studio
>>> > solution files use to turn off warnings, so this is doing the right
>>> > thing.
>>> >
>>> > NOTE: the warning feature is an incidental feature, so it is not
>>> > propagated.
>>> That is bad. When users build something with warnings=off from the
>>> command-line and get a pile of warnings, they will think, like I did,
>>> that something is wrong. And it is.
>> In fact, incidental features *are* propagated, at least they are supposed to
>> be.
>> Dave, do you have a minimal example reproducing the problem?
> I'm afraid not. I was building the Boost.Python tests, though, so it
> should be easy enough to reproduce.

Maybe this gives you a clue. Notice that the first TU is /W0 and the
second one is /W4:

  msvc.compile.c++ ..\..\..\bin.v2\libs\python\test\select_from_python_test.test\msvc-6.0\debug\type_id.obj

      call "C:\Program Files\Microsoft Visual Studio\VC98\Bin\VCVARS32.BAT" >nul
  cl /Zm800 -nologo -TP /Z7 /Od /Ob0 /W0 /GR /MDd /GB /EHs @"..\..\..\bin.v2\libs\python\test\select_from_python_test.test\msvc-6.0\debug\type_id.obj.rsp" -c -Fo"..\..\..\bin.v2\libs\python\test\select_from_python_test.test\msvc-6.0\debug\type_id.obj"

  ..\..\..\libs\python\src\converter\type_id.cpp(181) : error C2491: '<<' : definition of dllimport function not allowed
  ..\..\..\libs\python\src\converter\type_id.cpp(188) : error C2491: '<<' : definition of dllimport function not allowed
  msvc.compile.c++ ..\..\..\bin.v2\libs\python\build\msvc-6.0\debug\slice.obj

      call "C:\Program Files\Microsoft Visual Studio\VC98\Bin\VCVARS32.BAT" >nul
  cl /Zm800 -nologo -TP /Z7 /Od /Ob0 /W4 /GR /MDd /GB /EHs @"..\..\..\bin.v2\libs\python\build\msvc-6.0\debug\slice.obj.rsp" -c -Fo"..\..\..\bin.v2\libs\python\build\msvc-6.0\debug\slice.obj"


Dave Abrahams
Boost Consulting

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