Improve behavior on multi-config generators - #1384
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The current
CMakeLists.txtis generally assumesCMAKE_BUILD_TYPEis set at configure time, however, on multi-config generators (such as Visual Studio generators), this is typically not the case. Instead, the configuration can be changed at build time, and anything configuration-dependent needs to utilize generator expressions. (Thankfully, generator expressions using the configuration will also work fine for single-configuration generators.)These changes try to replace use of
CMAKE_BUILD_TYPEwith generator expressions where sensible. In the case of theMI_DEBUGoption, the default case will choose different flags depending on whether Release or Debug configurations are build.If some non-default
MI_DEBUGwas chosen it will have precedence.I made this PR against
dev3mainly to simplify things for me. If these changes are deemed desirable, I can look into porting them to the otherdevbranches later.