Allow lib/irrlichtmt to work for server builds (headers-only)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index fe508ffdbecdddf291ad1eb68728ecbc5aeaa0c8..9cb5678c4b15b10d0dda37e84614824a79bb5f14 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -60,13 +60,19 @@ set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake/Modules/")
 # This is done here so that relative search paths are more reasonable
 if(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/lib/irrlichtmt")
        message(STATUS "Using user-provided IrrlichtMt at subdirectory 'lib/irrlichtmt'")
-       # tell IrrlichtMt to create a static library
-       set(BUILD_SHARED_LIBS OFF CACHE BOOL "Build shared library" FORCE)
-       add_subdirectory(lib/irrlichtmt EXCLUDE_FROM_ALL)
-       unset(BUILD_SHARED_LIBS CACHE)
-
-       if(NOT TARGET IrrlichtMt)
-               message(FATAL_ERROR "IrrlichtMt project is missing a CMake target?!")
+       if(BUILD_CLIENT)
+               # tell IrrlichtMt to create a static library
+               set(BUILD_SHARED_LIBS OFF CACHE BOOL "Build shared library" FORCE)
+               add_subdirectory(lib/irrlichtmt EXCLUDE_FROM_ALL)
+               unset(BUILD_SHARED_LIBS CACHE)
+
+               if(NOT TARGET IrrlichtMt)
+                       message(FATAL_ERROR "IrrlichtMt project is missing a CMake target?!")
+               endif()
+       else()
+               add_library(IrrlichtMt::IrrlichtMt INTERFACE IMPORTED)
+               target_include_directories(IrrlichtMt::IrrlichtMt INTERFACE
+                       "${CMAKE_CURRENT_SOURCE_DIR}/lib/irrlichtmt/include")
        endif()
 else()
        find_package(IrrlichtMt QUIET)