[cmake-developers] toolset Clang 3.7 with Microsoft CodeGen (v140_clang_3_7) debug is broken

[forumer at smartmobili.com]

Hi,

Don't know if it's the best place to report it but I am testing nightly 
builds(3.5.20160429) to generate some projects
for Visual Studio 2015 and the clang toolset now provided by Microsoft.
There is one problem when using debug configurations because we cannot 
debug generated executables.
I have found some changes that seems to be necessary to be able to 
debug, here are the changes I have found:


1) DebugInformationFormat should be set FullDebug, AdditionalOptions 
MUST BE removed and optimizations must be disabled

<ClCompile>
    ... REMOVE AdditionalOptions ...
    <DebugInformationFormat>FullDebug</DebugInformationFormat>
    ...
    <Optimization>Disabled</Optimization>
    <OmitFramePointers>false</OmitFramePointers>
</ClCompile>


2)GenerateDebugInformation must be set to true and ProgramDataBaseFile 
must be empty because clang doesn't use pdb for now
<Link>
...
       <GenerateDebugInformation>true</GenerateDebugInformation>
...
       <ProgramDataBaseFile>
       </ProgramDataBaseFile>

</Link>

Thanks