CMakeLists.txt: Add strict printf format warnings

Author: mrannanj

CMakeLists.txt

@@ -83,7 +83,10 @@ if(MSVC)
     # C4702: unreachable code
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /we4702")
 else()
-    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -Wno-unused-parameter -Wformat -pedantic -Wvla")
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -Wno-unused-parameter -Wformat=2 -pedantic -Wvla")
+    if(CMAKE_C_COMPILER_ID STREQUAL "GNU")
+        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wformat-signedness")
+    endif()
     set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -ggdb -Werror -fno-omit-frame-pointer")
     set(CMAKE_C_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS_RELWITHDEBINFO} -g -O2 -fno-omit-frame-pointer -DNDEBUG")
     set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -O2 -DNDEBUG")