FIX: Nested Macros Cause Errors C2065 and C2064

• The C/C++ Compiler (CL.EXE) included with: - Microsoft Visual C++, 32-bit Editions, versions 4.0, 4.1

SYMPTOMS

A nested macro may cause errors similar to the following:

   error C2065: 'MACRO_B' : undeclared identifier
   error C2064: term does not evaluate to a function
   error C2143: syntax error : missing ';' before '}'

CAUSE

The second macro is not being expanded correctly. A preprocessed file for the following sample shows that MACRO_B is not expanded:

      { MACRO_B ("Hello world.\n") };

      { { printf("Hello world.\n"); } };

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This bug was corrected in Visual C++ 32-bit Edition, versions 4.2.

MORE INFORMATION

Sample Code

      /* Compile options needed: none
      */

      #include <stdio.h>

      #define MACRO_A(A)      { MACRO_B A }
      #define MACRO_B(A)      { printf(A); }

      void main()
      {
          MACRO_A(("Hello world.\n"));
      }

Keywords          : CLIss CodeGen kbtool kbbuglist kbfixlist vcbuglist400 vcbuglist420
Component         : C/C++ Compiler
Version           : 4.0 4.1
Platform          : NT WINDOWS
Issue type        : kbbug
Solution Type     : kbfix