Here be 🐉🐉🐉

Hunter only propagates the Toolchain file, but you can't change the MSVC flags CMAKE generates in pre-3.15 versioned configs until after it has loaded the MSVC toolchain info which happens AFTER the toolchain file is processed.

So... h4ck5

3.15 also introduced CMAKE_PROJECT_INCLUDE which includes a cmake file after the toolchain is loaded but before anything in the project is processed. This is done regardless of what minimum version is specified in CMakeLists.txt.

∴

We can specify a default toolchain in our CMakeLists.txt

cmake_minimum_required(VERSION 3.15 FATAL_ERROR)

set(
    CMAKE_TOOLCHAIN_FILE
    "cmake/toolchain.cmake"
    CACHE
    FILEPATH
    "Default toolchain used for both hunter and our code"
)

That in turn configures an after project include

set(
    CMAKE_PROJECT_INCLUDE
    "${CMAKE_CURRENT_LIST_DIR}/project_after.cmake"
    CACHE
    FILEPATH
    "Project after include"
)

That performs the hacks on the flags when running msvc

#This has to happen after the toolchain is done loading.
IF(MSVC)
    #Static build
     #cmake_policy(SET CMP0091 NEW) #This doesn't work in a toolchain, nor in project_after
    #But we still need to set this for the root Cmake which requires cmake 3.15 for the project_include rule...
    set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")
   #This is for cmake_minimum_version less than 3.15 (AKA the Hunter builds)
    set(variables
      CMAKE_C_FLAGS_DEBUG
      CMAKE_C_FLAGS_MINSIZEREL
      CMAKE_C_FLAGS_RELEASE
      CMAKE_C_FLAGS_RELWITHDEBINFO
      CMAKE_CXX_FLAGS_DEBUG
      CMAKE_CXX_FLAGS_MINSIZEREL
      CMAKE_CXX_FLAGS_RELEASE
      CMAKE_CXX_FLAGS_RELWITHDEBINFO
    )
    message(STATUS "MSVC -> forcing use of statically-linked runtime.")
    foreach(variable ${variables})
    if(${variable} MATCHES "/MD")
        string(REGEX REPLACE "/MD" "/MT" ${variable} "${${variable}}")
    endif()
    endforeach()
ENDIF(MSVC)

The toolchain id does indeed reflect this modification, boost believes it is being compiled with a static runtime. I'll let you know in a few hours if it worked once it is done compiling boost. For the 20th time... 😭😭😭😭

specifying msvc runtime #349

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