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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#line
The #line directive specifies a line-number and optional filename for the next line in the source file.
#line line-number « filename »
C source code may come from more than one source file if the #include directive is used. The proprocessor tracks the line number and file name so that the C compiler can accurately reference lines causing errors or warnings. Additionally, accurate file name and line number details are necessary to support source-level debugging.
Third-party tools exist that may be used to generate C source code from a high-level specification language. A common use for the #line directive is to sets the source line-number and filename, in the generated source, to the actual line number and file name of the specification language file. When errors are output, the line number and file referenced will be the original specification rather than the actual C source file.
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