Error directive
From cppreference.com
< c | preprocessor
Shows the given error message and renders the program ill-formed.
Syntax
#error error_message
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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.
Example
Run this code
#if __STDC__ != 1 # error "Not a standard compliant compiler" #endif #include <stdio.h> int main (void) { printf("The compiler used conforms to the ISO C Standard !!"); }
Possible output:
The compiler used conforms to the ISO C Standard !!
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