Work around InstallRequiredSystemLibraries broken in VS2019.

Author: dechamps

src/CMakeLists.txt

@@ -110,4 +110,10 @@ ExternalProject_Add(
 
 install(DIRECTORY "${INTERNAL_INSTALL_PREFIX}/" DESTINATION "${CMAKE_INSTALL_PREFIX}")
 install(SCRIPT dechamps_CMakeUtils/InstallPdbFiles.cmake)
+
+# Work around https://developercommunity.visualstudio.com/content/problem/618088/cmake-msvc-toolset-version-is-incorrect-in-visual.html
+# Note that for InstallRequiredSystemLibraries to work you might also need to work around https://developercommunity.visualstudio.com/content/problem/618084/cmake-installrequiredsystemlibraries-broken-in-lat.html
+if (MSVC_VERSION EQUAL 1921 AND MSVC_TOOLSET_VERSION EQUAL 141)
+	set(MSVC_TOOLSET_VERSION 142)
+endif()
 include(InstallRequiredSystemLibraries)

src/README.md

@@ -27,7 +27,14 @@ cmake -P installer.cmake
 
 Note that for this command to work, you need to have [Inno Setup][] installed.
 
+## Troubleshooting
+
+### VC runtime DLLs are not included in the installation
+
+See this [Visual Studio 2019 bug][InstallRequiredSystemLibraries].
+
 [ASIO SDK]: http://www.steinberg.net/en/company/developer.html
 [Inno Setup]: http://www.jrsoftware.org/isdl.php
+[InstallRequiredSystemLibraries]: https://developercommunity.visualstudio.com/content/problem/618084/cmake-installrequiredsystemlibraries-broken-in-lat.html
 [PortAudio]: http://www.portaudio.com/
 [tinytoml]: https://github.com/mayah/tinytoml