My brain was on airplane mode. I used a MSVC command option, not Clang, fixed.

Author: michael-manley

src/CMakeLists.txt

@@ -77,6 +77,6 @@ add_executable(pcem ${PCEM_SRC} ${PCEM_PRIVATE_API} ${PCEM_EMBEDDED_PLUGIN_API})
 target_compile_definitions(pcem PUBLIC ${PCEM_DEFINES})
 target_compile_options(pcem PUBLIC $<$<COMPILE_LANGUAGE:CXX>:-fcommon> $<$<COMPILE_LANGUAGE:C>:-fcommon>)
 if(${CMAKE_SYSTEM_NAME} STREQUAL "Windows")
-        target_link_options(pcem PRIVATE "/SUBSYSTEM:WINDOWS")
+        target_link_options(pcem PRIVATE "-Wl,--subsystem,windows")
 endif()
 target_link_libraries(pcem ${PCEM_LIBRARIES})