feat: support quickstart with Windows+CMake+Static builds (#1477)

Author: coryan

quickstart/CMakeLists.txt

@@ -27,6 +27,13 @@ set(CMAKE_CXX_STANDARD_REQUIRED ON)
 # spanner:
 find_package(spanner_client REQUIRED)
 
+# MSVC requires some additional code to select the correct runtime library
+if (VCPKG_TARGET_TRIPLET MATCHES "-static$")
+    set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")
+else ()
+    set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>DLL")
+endif ()
+
 # Define your targets.
 add_executable(quickstart quickstart.cc)
 target_link_libraries(quickstart googleapis-c++::spanner_client)

quickstart/README.md

@@ -100,6 +100,10 @@ bazel build --copt=-DGRPC_BAZEL_BUILD ...
 
 ### Windows
 
+To correctly configure the MSVC runtime you should change the CMake minimum
+required version to 3.15 or add `-DCMAKE_POLICY_DEFAULT_CMP0091=NEW` to the
+CMake configuration step.
+
 gRPC [requires][grpc-roots-pem-bug] an environment variable to configure the trust store for SSL certificates, you
 can download and configure this using: