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Compiler Warning (level 1) C4117

macro name 'name' is reserved; 'Command' ignored

To fix by checking the following possible causes

  1. Trying to define or undefine a predefined macro.

  2. Trying to define or undefine the preprocessor operator defined.

The following sample generates C4117:

// C4117.cpp
// compile with: /W1
#define __FILE__ test         // C4117. __FILE__ is a predefined macro
#define ValidMacroName test   // ok

int main() {
}

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