6.6.4.2.21 -Wtraditional

Warn about certain constructs that behave differently in traditional and ANSI C.

Macro arguments occurring within string constants in the macro body. These would substitute the argument in traditional C, but are part of the constant in ANSI C.
A function declared external in one block and then used after the end of the block.
A switch statement has an operand of type long.
A nonstatic function declaration follows a static one. This construct is not accepted by some traditional C compilers.

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