CMake: add option to disable building of executable

CMakeLists.txt

@@ -19,6 +19,7 @@ if (NOT NGP_DEPLOY)
 	set(NGP_VERSION "${NGP_VERSION}dev")
 endif()
 
+option(NGP_BUILD_EXECUTABLE "Build instant-ngp.exe?" ON)
 option(NGP_BUILD_WITH_GUI "Build with GUI support (requires GLFW and GLEW)?" ON)
 option(NGP_BUILD_WITH_OPTIX "Build with OptiX to enable hardware ray tracing?" ON)
 option(NGP_BUILD_WITH_PYTHON_BINDINGS "Build bindings that allow instrumenting instant-ngp with Python?" ON)
@@ -332,10 +333,7 @@ target_include_directories(ngp PUBLIC ${NGP_INCLUDE_DIRECTORIES})
 target_link_directories(ngp PUBLIC ${NGP_LINK_DIRECTORIES})
 target_link_libraries(ngp PUBLIC ${NGP_LIBRARIES} tiny-cuda-nn)
 
-add_executable(instant-ngp src/main.cu)
-target_link_libraries(instant-ngp PRIVATE ngp)
-
-# Copy DLSS shared libraries
+# Copy shared libraries to the binary directory as needed
 if (NGP_VULKAN)
 	set(NGX_BUILD_DIR "$<IF:$<CONFIG:Debug>,dev,rel>")
 	if (MSVC)
@@ -344,23 +342,32 @@ if (NGP_VULKAN)
 		set(NGX_SHARED_LIB "${CMAKE_CURRENT_SOURCE_DIR}/dependencies/dlss/lib/Linux_x86_64/${NGX_BUILD_DIR}/libnvidia-ngx-dlss.so.*")
 	endif()
 
-	add_custom_command(TARGET instant-ngp POST_BUILD
-		COMMAND ${CMAKE_COMMAND} -E copy "${NGX_SHARED_LIB}" $<TARGET_FILE_DIR:instant-ngp>
-		COMMAND_EXPAND_LISTS
-	)
+	add_custom_command(TARGET ngp POST_BUILD COMMAND ${CMAKE_COMMAND} -E copy "${NGX_SHARED_LIB}" "${CMAKE_CURRENT_BINARY_DIR}" COMMAND_EXPAND_LISTS)
 endif()
 
 if (MSVC)
-	# Copy CUDA runtime DLLs to the build directory so that Python can find them.
 	file(GLOB CUDA_DLLS "${CUDA_COMPILER_BIN}/cudart64*.dll")
 	if (CUDA_DLLS)
-		add_custom_command(TARGET instant-ngp POST_BUILD
-			COMMAND ${CMAKE_COMMAND} -E copy ${CUDA_DLLS} $<TARGET_FILE_DIR:instant-ngp>
-			COMMAND_EXPAND_LISTS
-		)
+		add_custom_command(TARGET ngp POST_BUILD COMMAND ${CMAKE_COMMAND} -E copy ${CUDA_DLLS} "${CMAKE_CURRENT_BINARY_DIR}" COMMAND_EXPAND_LISTS)
 	endif()
 endif()
 
+if (NGP_BUILD_EXECUTABLE)
+	add_executable(instant-ngp src/main.cu)
+	target_link_libraries(instant-ngp PRIVATE ngp)
+
+	# Link the executable to the project directory and copy over DLLs such that instant-ngp can be invoked without going into the build folder.
+	set(NGP_BINARY_FILE "\"${CMAKE_CURRENT_SOURCE_DIR}/$<TARGET_FILE_NAME:instant-ngp>\"")
+	if (MSVC)
+		add_custom_command(TARGET instant-ngp POST_BUILD COMMAND ${CMAKE_COMMAND} -E copy $<TARGET_FILE:instant-ngp> ${CMAKE_CURRENT_SOURCE_DIR})
+		file(GLOB NGP_REQUIRED_DLLS "${CMAKE_CURRENT_BINARY_DIR}/*.dll")
+		if (NGP_REQUIRED_DLLS)
+			add_custom_command(TARGET instant-ngp POST_BUILD COMMAND ${CMAKE_COMMAND} -E copy ${NGP_REQUIRED_DLLS} ${CMAKE_CURRENT_SOURCE_DIR} COMMAND_EXPAND_LISTS)
+		endif()
+	else()
+		add_custom_command(TARGET instant-ngp POST_BUILD COMMAND ${CMAKE_COMMAND} -E create_symlink $<TARGET_FILE:instant-ngp> "${NGP_BINARY_FILE}")
+	endif()
+endif(NGP_BUILD_EXECUTABLE)
 
 if (Python_FOUND)
 	add_library(pyngp SHARED src/python_api.cu)
@@ -369,21 +376,3 @@ if (Python_FOUND)
 	target_compile_definitions(pyngp PUBLIC -DNGP_PYTHON)
 	pybind11_extension(pyngp)
 endif()
-
-# Link the executable to the project directory and copy over DLLs such that instant-ngp can be invoked without going into the build folder.
-set(NGP_BINARY_FILE "\"${CMAKE_CURRENT_SOURCE_DIR}/$<TARGET_FILE_NAME:instant-ngp>\"")
-if (MSVC)
-	add_custom_command(TARGET instant-ngp POST_BUILD COMMAND ${CMAKE_COMMAND} -E copy $<TARGET_FILE:instant-ngp> ${CMAKE_CURRENT_SOURCE_DIR})
-	file(GLOB NGP_REQUIRED_DLLS "${CUDA_COMPILER_BIN}/cudart64*.dll")
-	if (NGP_VULKAN)
-		list(APPEND NGP_REQUIRED_DLLS "${NGX_SHARED_LIB}")
-	endif()
-	if (NGP_REQUIRED_DLLS)
-		add_custom_command(TARGET instant-ngp POST_BUILD
-			COMMAND ${CMAKE_COMMAND} -E copy ${NGP_REQUIRED_DLLS} ${CMAKE_CURRENT_SOURCE_DIR}
-			COMMAND_EXPAND_LISTS
-		)
-	endif()
-else()
-	add_custom_command(TARGET instant-ngp POST_BUILD COMMAND ${CMAKE_COMMAND} -E create_symlink $<TARGET_FILE:instant-ngp> "${NGP_BINARY_FILE}")
-endif()