Add missing -ldl to unix-style OS:es (#4)

CMakeLists.txt

@@ -27,37 +27,39 @@ if (DYNLOAD_IMPORT)
     add_library(dynl::dynl_headers ALIAS dynl_headers)
     target_include_directories(dynl_headers INTERFACE
             include
-            )
+    )
     target_compile_features(dynl_headers INTERFACE cxx_std_20)
 
     if (DYNLOAD_USE_EXCEPTIONS)
     else ()
         target_compile_definitions(dynl_shared PRIVATE
                 "DYNLOAD_NO_EXCEPTIONS=1"
-                )
+        )
     endif ()
 
     if (DYNLOAD_HEADERONLY)
-    set(DYNLOAD_LIB_TYPE INTERFACE)
-    set(DYNLOAD_PUBLIC_LINK_TYPE INTERFACE)
+        set(DYNLOAD_LIB_TYPE INTERFACE)
+        set(DYNLOAD_PUBLIC_LINK_TYPE INTERFACE)
     else ()
-    set(DYNLOAD_LIB_TYPE "")
-    set(DYNLOAD_PUBLIC_LINK_TYPE PUBLIC)
+        set(DYNLOAD_LIB_TYPE "")
+        set(DYNLOAD_PUBLIC_LINK_TYPE PUBLIC)
     endif ()
 
     add_library(dynl ${DYNLOAD_LIB_TYPE})
     add_library(dynl::dynl ALIAS dynl)
     target_link_libraries(dynl ${DYNLOAD_PUBLIC_LINK_TYPE}
             dynl::dynl_headers
             ${DYNLOAD_DEV_LINK}
-            )
+    )
     if (DYNLOAD_COMPILE_PLATFORM)
         if (WIN32)
             set(DYNL_SRC src/dynl_win32.cpp)
             set(DYNL_PLATFORM DYNL_WINDOWS=1)
+            set(DYNL_EXTRA_LINK "")
         elseif (UNIX)
             set(DYNL_SRC src/dynl_unix.cpp)
             set(DYNL_PLATFORM DYNL_UNIX=1)
+            set(DYNL_EXTRA_LINK dl)
         else ()
             message(SEND_ERROR "Dynload: no automatic backend available! Use custom defined source file")
         endif ()
@@ -66,16 +68,18 @@ if (DYNLOAD_IMPORT)
         set(DYNL_SRC "")
         set(DYNL_PLATFORM "")
     endif ()
-    if(DYNLOAD_HEADERONLY)
+    if (DYNLOAD_HEADERONLY)
         target_compile_definitions(dynl INTERFACE DYNLOAD_HEADERONLY=1 ${DYNL_PLATFORM})
+        target_link_libraries(dynl INTERFACE ${DYNL_EXTRA_LINK})
     else ()
         target_sources(dynl PRIVATE ${DYNL_SRC})
+        target_link_libraries(dynl PRIVATE ${DYNL_EXTRA_LINK})
     endif ()
 endif ()
 if (DYNLOAD_EXPORT)
     add_library(dynl_export INTERFACE)
     add_library(dynl::dynl_export ALIAS dynl_export)
     target_include_directories(dynl_export INTERFACE
             export_include
-            )
+    )
 endif ()