[Cdash] Random +- on warnings for parallel builds with VC10

[Hauke Heibel]

Hi,

I have setup a continuous build on a windows machine (the CDash 1.8.2
script is attached) and I am observing +- changes on the warnings even
though the code base does not change.

>From the warning messages it seems as if this is related to parallel
builds. I usually let CMake add the compiler flag /MP to my projects
and the number of warning changes (+-'s) decreased a lot after I fixed
the number of cores to 1. There are still some changes remaining and I
can only assume that they are caused by the fact that VC10 (as well as
older versions) builds .vcxproj's in parallel.

Is this a known issue an/ord is there any way to circumvent this issue
instead of completely disabling parallel builds?

Regards,
Hauke
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sample warning
8> warning C4267: 'argument' ...
-------
warning message build A)

10>InitializeBuildStatus:
10>  Creating "MachineLearning.dir\Release\MachineLearning.unsuccessfulbuild" because "AlwaysCreate" was specified.
7>  Contour.cpp
10>CustomBuild:
10>  Building Custom Rule /.../bar/MachineLearning/CMakeLists.txt
10>  CMake does not need to re-run because C:\development\contintegration\build\MachineLearning\CMakeFiles\generate.stamp is up-to-date.
9>  TestHelpers.cpp
10>ClCompile:
10>  MachineLearningHelpers.cpp
3>  GPUImage.cpp
 8>c:\development\3rdparty\x64\opencv\include\opencv2\flann\lsh_table.h(417): warning C4267: 'argument' : conversion from 'size_t' to 'std::tr1::seed_seq::result_type', possible loss of data

warning message build B)

10>  Creating directory "C:\development\contintegration\build\MachineLearning\Release\".
10>InitializeBuildStatus:
10>  Creating "MachineLearning.dir\Release\MachineLearning.unsuccessfulbuild" because "AlwaysCreate" was specified.
9>  TestHelpers.cpp
10>CustomBuild:
10>  Building Custom Rule /.../bar/MachineLearning/CMakeLists.txt
10>  CMake does not need to re-run because C:\development\contintegration\build\MachineLearning\CMakeFiles\generate.stamp is up-to-date.
3>  GPUImage.cpp
10>ClCompile:
7>  Contour.cpp
 8>c:\development\3rdparty\x64\opencv\include\opencv2\flann\lsh_table.h(417): warning C4267: 'argument' : conversion from 'size_t' to 'std::tr1::seed_seq::result_type', possible loss of data
 10>  MachineLearningHelpers.cpp
 
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