diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2a2a665..8049415 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -29,23 +29,56 @@ set(CMAKE_CXX_STANDARD 14)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS OFF)
 
-set(DEBUG_CXXFLAGS
-  "-Wall"
-  "-Wextra"
-  "-Wpedantic"
-  "-ftrapv"
-  "-fsanitize=undefined"
-  "-g"
-  "-Og"
-  "-fno-omit-frame-pointer")
-set(DEBUG_LDFLAGS
-  "-fsanitize=undefined")
-add_compile_options("$<$<CONFIG:Debug>:${DEBUG_CXXFLAGS}>")
-# add_link_options was introduced in version 3.13.
-if(${CMAKE_VERSION} VERSION_LESS 3.13)
-  set(CMAKE_SHARED_LINKER_FLAGS_DEBUG "${DEBUG_LDFLAGS}")
-else()
-  add_link_options("$<$<CONFIG:Debug>:${DEBUG_LDFLAGS}>")
+set(DEBUG_CXXFLAGS "")
+# GCC >= 5.0 or Clang >= 5.0 is assumed.
+if(CMAKE_CXX_COMPILER_ID MATCHES "GNU" OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
+    list(APPEND DEBUG_CXXFLAGS
+        "-Wall"
+        "-Wextra"
+        "-Wpedantic"
+        "-Wuninitialized"
+        "-Wshadow"
+        "-Wnon-virtual-dtor"
+        "-Wconversion"
+        "-Wsign-conversion"
+        "-Wold-style-cast"
+        "-Wzero-as-null-pointer-constant"
+        # "-Wmissing-declarations"
+        "-Wcast-align"
+        "-Wunused"
+        "-Woverloaded-virtual"
+        "-Wdouble-promotion"
+        "-Wformat=2"
+        "-ftrapv"
+        "-fsanitize=undefined"
+        "-g"
+        "-Og"
+        "-fno-omit-frame-pointer")
+    if(CMAKE_CXX_COMPILER_ID MATCHES "GNU")
+        list(APPEND DEBUG_CXXFLAGS
+            "-Wlogical-op"
+            "-Wuseless-cast")
+        if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS "6")
+            list(APPEND DEBUG_CXXFLAGS
+                "-Wmisleading-indentation"
+                "-Wduplicated-cond"
+                "-Wnull-dereference")
+            if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS "7")
+                list(APPEND DEBUG_CXXFLAGS
+                    "-Wduplicated-branches")
+            endif()
+        endif()
+    endif()
+
+    set(DEBUG_LDFLAGS
+        "-fsanitize=undefined")
+    add_compile_options("$<$<CONFIG:Debug>:${DEBUG_CXXFLAGS}>")
+    # add_link_options was introduced in version 3.13.
+    if(${CMAKE_VERSION} VERSION_LESS 3.13)
+        set(CMAKE_SHARED_LINKER_FLAGS_DEBUG "${DEBUG_LDFLAGS}")
+    else()
+        add_link_options("$<$<CONFIG:Debug>:${DEBUG_LDFLAGS}>")
+    endif()
 endif()
 
 add_subdirectory(src)