BUG: Expansion of the LINE macro is incorrect when you use Debug Information for Edit and Continue (/ZI) in Visual C++

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This article was previously published under Q199057

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SYMPTOMS

The results of the __LINE__ macro are incorrect when you use Debug Information for Edit and Continue (/ZI). The problem may manifest itself as compiler, linker, or run-time errors.

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WORKAROUND

To work around this problem, use the Program Database option (/Zi) instead of Edit and Continue (/ZI).

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STATUS

Microsoft has confirmed that this is a bug in the Microsoft products that are listed in the "Applies to" section.

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MORE INFORMATION

The following sample code demonstrates the problem.

   // TEST.CPP - Compile with /GX and /Zi or /ZI.
   #include <iostream>
   using namespace std;

   #define CONCAT(s1,s2) #s1 ## #s2
   #define MSG(n) cout << CONCAT(Message at line\x20,n) << endl;

   int main()
   {
   MSG(__LINE__);
   return 0;
   }

When compiled with the /Zi option, output is correct:

Message at line 12

When compiled with the /ZI option, output is incorrect:

Message at line (__LINE__Var+1)

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