为什么Visual Studio忽略了我的项目中的.h文件？

When I posted this question about trying to build a DLL and not getting one, a commenter mentioned that I was probably not exporting any symbols in the project. When I checked, I found that the project file CMake had built didn't contain the .h file for the project, so I added it. It contains the needed export declarations. Unfortunately, rebuilding still doesn't generate a DLL, and after playing around a little, I find that the compiler doesn't seem to notice the .h file at all; when I write things in there that are obviously syntactically invalid, it doesn't even break the build. about trying to bui