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Cx51 User's Guide
Cx51 Introduction Compiling Programs Language Extensions Preprocessor Header Files
How #include Works Including Files Once Only Macros Simple Macros Complex Macros Macro Operators Stringize (#) Token Pasting (##) Defined Predefined Macros Undefining and Redefining Macro Caveats Preprocessor Directives Conditional Compilation #define #elif #else #endif #error #if #ifdef #ifndef #include #line #message #pragma #undef #warning Advanced Programming 8051 Derivatives Error Messages Library Reference Appendix#error
The #error directive causes the preprocessor to emit an error message. The rest of the line is the error message.
#error "message"
You may use #error inside a condition that detects an error condition. For example, the following outputs an error message if __KEIL__ is not defined.
#ifndef __KEIL__ #error "This code will not work without the Keil Compiler." #endif
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