Added macros for specific C standards

All the currently avialable C standards from C90 to C23.

Author: StableCoder

c-standards.cmake

@@ -0,0 +1,49 @@
+#
+# Copyright (C) 2021 by George Cave - [email protected]
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may not
+# use this file except in compliance with the License. You may obtain a copy of
+# the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations under
+# the License.
+
+# Set the compiler standard to C89/90
+macro(c_90)
+  set(CMAKE_C_STANDARD 90)
+  set(CMAKE_C_STANDARD_REQUIRED ON)
+  set(CMAKE_C_EXTENSIONS OFF)
+endmacro()
+
+# Set the compiler standard to C99
+macro(c_99)
+  set(CMAKE_C_STANDARD 99)
+  set(CMAKE_C_STANDARD_REQUIRED ON)
+  set(CMAKE_C_EXTENSIONS OFF)
+endmacro()
+
+# Set the compiler standard to C11
+macro(c_11)
+  set(CMAKE_C_STANDARD 11)
+  set(CMAKE_C_STANDARD_REQUIRED ON)
+  set(CMAKE_C_EXTENSIONS OFF)
+endmacro()
+
+# Set the compiler standard to C17
+macro(c_17)
+  set(CMAKE_C_STANDARD 17)
+  set(CMAKE_C_STANDARD_REQUIRED ON)
+  set(CMAKE_C_EXTENSIONS OFF)
+endmacro()
+
+# Set the compiler standard to C23
+macro(c_23)
+  set(CMAKE_C_STANDARD 23)
+  set(CMAKE_C_STANDARD_REQUIRED ON)
+  set(CMAKE_C_EXTENSIONS OFF)
+endmacro()