[FIX] remove warnings on clang static building

Author: h-2

src/CMakeLists.txt

@@ -75,7 +75,11 @@ if (CMAKE_COMPILER_IS_GNUCXX OR COMPILER_IS_CLANG AND NOT MINGW)
     option (LAMBDA_STATIC_BUILD "Include all libraries in the binaries." OFF)
     if (LAMBDA_STATIC_BUILD)
         set(CMAKE_FIND_LIBRARY_SUFFIXES ".a")
-        set(CMAKE_EXE_LINKER_FLAGS "-static-libgcc -static-libstdc++ -static")
+        if (CMAKE_COMPILER_IS_GNUCXX)
+            set(CMAKE_EXE_LINKER_FLAGS "-static-libgcc -static-libstdc++ -static")
+        else (CMAKE_COMPILER_IS_GNUCXX)
+            set(CMAKE_EXE_LINKER_FLAGS "-static")
+        endif (CMAKE_COMPILER_IS_GNUCXX)
         message (STATUS "STATIC_BUILD activated, binaries built with all libs included.")
     endif (LAMBDA_STATIC_BUILD)
 endif ()