[vtkusers] MinGW visibility attribute not supported warning

[Sascha Zelzer]

Forgot the attachment...

Am 27.08.2010 14:04, schrieb Sascha Zelzer:
> Hi,
>
> when building VTK with MinGW, a lot of visibility warnings ("visibility
> attribute not supported in this configuration") are displayed. This is
> due to
>
> set(VTK_ABI_CXX_FLAGS "-fvisibility=hidden -fvisibility-inlines-hidden")
>
> in line 43 of vtkCompilerExtras.cmake. Although MinGW is a gcc variant,
> it is not necessary to set the visibility flags if you use
> __declspec(export) attributes and don't use --export-all-symbols. See
> for example
> http://www.redhat.com/docs/manuals/enterprise/RHEL-4-Manual/gnu-linker/win32.html
>
> I attached a patch which would fix this issue by not adding the
> visibility flags if the compiler is MinGW. Any feedback is appreciated.
>
> Thanks,
> Sascha
>    

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