cmake/compiler_flags.cmake: removed clang-warning Wrange-loop-analysis for clang <10

cmake/compiler_flags.cmake

@@ -34,6 +34,10 @@ if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
     set(libClaPP_TEST_CXX_PEDANTIC_COMPILE_OPTIONS ${libClaPP_CXX_PEDANTIC_COMPILE_OPTIONS})
 elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
     list(APPEND libClaPP_CXX_PEDANTIC_COMPILE_OPTIONS -Weverything -Wno-c++98-compat -Wno-c++98-compat-pedantic -Wno-padded -Werror -pedantic-errors)
+    if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS "10.0.0")
+        #before clang-10, it issues a warning if a range-based-for loop (of const ref) is used.
+        list(APPEND libClaPP_CXX_PEDANTIC_COMPILE_OPTIONS -Wno-range-loop-analysis)
+    endif()
     set(libClaPP_TEST_CXX_PEDANTIC_COMPILE_OPTIONS ${libClaPP_CXX_PEDANTIC_COMPILE_OPTIONS})
     list(APPEND libClaPP_TEST_CXX_PEDANTIC_COMPILE_OPTIONS -Wno-global-constructors)
 endif()