Setting global compiler flags

[mikehallmusco]

I have a Visual Studio Solution for which I am trying to create a port. The Solution contains C++ and C# and Managed C++ (CLR) projects. I am using the vcpkg_msbuild_install function to build the Solution. The problem is that this function generates a target file with compiler options that are incompatible with my projects' compiler options. Specifically, /EHsc is not compatible with /clr. The generated target file contains the following line.

<AdditionalOptions Condition="'$(Configuration)'=='Release'">%(AdditionalOptions) -nologo -DWIN32 -D_WINDOWS -W3 -utf-8 -GR -EHsc -MP -MD -O2 -Oi -Gy -DNDEBUG -Z7 /WX-</AdditionalOptions>

Is there anyway to set these compiler options? Or remove them? Since I'd rather let the Solution file and Project files dictate their own compiler options.

I looked through the vcpkg_msbuild_install function's cmake, I then found the z_vcpkg_msbuild_create_props function's cmake. This indicates that the compiler options are coming from the VCPKG_COMBINED_CXX_FLAGS_DEBUG variable. I cannot inspect or set this in my port's cmake.

Is the solution here to create a custom triplet? Or is there a way to set the global compiler options?

After some more investigation, I see that those compiler switches come from the windows.cmake toolchain file. Some of the compiler and linker options defined in there seem strange. Why was /EHsc chosen? Because it is in the toolchain the only way to change it is with a custom toolchain file.