Home/ Questions/Q 615681
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-13T18:14:47+00:00

I have the following code : #define LIMIT_DATE \01-03-2010\ #ifdef LIMIT_DATE #if _MSC_VER #pragma

  • 0

I have the following code :

#define LIMIT_DATE \"01-03-2010\"

#ifdef LIMIT_DATE
    #if _MSC_VER
        #pragma message ("Warning : this release will expire on " LIMIT_DATE)
    #elif   __GNUC__
        #warning ("Warning : this release will expire on " LIMIT_DATE)
    #endif
#endif

The problem is that LIMIT_DATE is not evaluated when printing the warning.

I searched on Google, but didn’t found yet the solution.

Thanks for help.

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    From gcc preprocessor documentation

    Neither #error nor #warning
    macro-expands its argument. Internal
    whitespace sequences are each replaced
    with a single space. The line must
    consist of complete tokens. It is
    wisest to make the argument of these
    directives be a single string
    constant; this avoids problems with
    apostrophes and the like.

    So it’s not possible at least in gcc.

    According to MSDN this should work for MSVC althrough I don’t have access to Visual Studio currently to test this

    • 0