build: Added -pedantic-errors.

cmake/Modules/DefineCompilerFlags.cmake

@@ -9,7 +9,7 @@ if (UNIX AND NOT WIN32)
     #
     if (${CMAKE_C_COMPILER_ID} MATCHES GNU)
         # add -Wconversion ?
-        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu99 -pedantic")
+        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu99 -pedantic -pedantic-errors")
         set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -Wshadow -Wmissing-prototypes -Wdeclaration-after-statement")
         set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wunused -Wfloat-equal -Wpointer-arith -Wwrite-strings -Wformat-security")
         set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wmissing-format-attribute")