[C] Set C standard to C11 without extensions.

Author: Niko-Klaiber

CMakeLists.txt

@@ -52,6 +52,14 @@ if(NOT DEFINED CMAKE_CXX_EXTENSIONS)
    set(CMAKE_CXX_EXTENSIONS OFF)
 endif()
 
+if(NOT DEFINED CMAKE_C_STANDARD)
+   set(CMAKE_C_STANDARD 11)
+endif()
+
+if(NOT DEFINED CMAKE_C_EXTENSIONS)
+   set(CMAKE_C_EXTENSIONS OFF)
+endif()
+
 if(SBE_TESTS)
     set(SBE_THIRDPARTY_BINARY_DIR "${CMAKE_CURRENT_BINARY_DIR}/thirdparty")