Namespaces
Variants
Views
Actions

Error directive

From cppreference.com

Shows the given error message and renders the program ill-formed.

Contents

[edit] Syntax

#error error_message

[edit] Explanation

After encountering the #error directive, an implementation displays the diagnostic message error_message and renders the program ill-formed (the compilation stops).

error_message can consist of several words not necessarily in quotes.

[edit] Example

#if __STDC__ != 1
#  error "Not a standard compliant compiler"
#endif
 
#include <stdio.h>
int main (void)
{
    printf("It is a Standard compiler conforming to ISO C Standard !!");
}

Possible output:

It is a Standard compiler conforming to ISO C Standard !!

[edit] References

  • C11 standard (ISO/IEC 9899:2011):
  • 6.10.5 Error directive (p: 174)
  • C99 standard (ISO/IEC 9899:1999):
  • 6.10.5 Error directive (p: 159)
  • C89/C90 standard (ISO/IEC 9899:1990):
  • 3.8.5 Error directive

[edit] See also

C++ documentation for Error directive