msvc fix

Author: mortbopet

third_party/CMakeLists.txt

@@ -30,6 +30,29 @@ if(NOT ${GTEST_FOUND})
     GIT_TAG v1.14.0
     OVERRIDE_FIND_PACKAGE)
   fetchcontent_makeavailable(GTest)
+
+  if(MSVC)
+    # ------------------------------------------------------------------------------
+    # gtest MSVC fix
+    # ------------------------------------------------------------------------------
+    # For some reason, googletest has include path issues when built with MSVC.
+    # Specifically, this seems like some incorrect assumptions about include paths
+    # inside the gmock project.
+    # We can fix this by injecting the include paths here.
+    function(fix_gtest_include TARGET)
+      target_include_directories(
+        ${TARGET}
+        PUBLIC $<BUILD_INTERFACE:${gtest_SOURCE_DIR}>
+               $<BUILD_INTERFACE:${gtest_SOURCE_DIR}/include>
+               $<BUILD_INTERFACE:${gtest_SOURCE_DIR}/googletest>
+               $<BUILD_INTERFACE:${gtest_SOURCE_DIR}/googletest/include>
+               $<INSTALL_INTERFACE:include/${TARGET}>)
+    endfunction()
+    set(gtest_erroneous_targets gmock gmock_main)
+    foreach(target ${gtest_erroneous_targets})
+      fix_gtest_include(${target})
+    endforeach()
+  endif()
 endif()
 
 set(PREVIOUS_BUILD_TESTING ${BUILD_TESTING})