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Cx51 User's Guide
Cx51 Introduction
Compiling Programs
Language Extensions
Preprocessor
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How #include Works
Including Files Once Only
Macros
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Undefining and Redefining
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Preprocessor Directives
Conditional Compilation
#define
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Advanced Programming
8051 Derivatives
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Library Reference
Appendix
Predefined Macros
The Cx51 Compiler provides the following predefined constants you may use in preprocessor directives and C code to create portable programs.
| Constant | Description |
|---|---|
| __C51__ | Version number of the compiler (for example, 701 for version 7.01). |
| __CX51__ | Version number of the compiler (for example, 701 for version 7.01). |
| __DATE__ | Date when the compilation was started in ANSI format (month dd yyyy). |
| __DATE2__ | Date when the compilation was started in short form (mm/dd/yy). |
| __FILE__ | Name of the file being compiled. |
| __LINE__ | Current line number in the file being compiled. |
| __MODEL__ | Memory model selected: |
| __TIME__ | Time when the compilation was started. (Format: hh:mm:ss) |
| __STDC__ | Defined to 1 to indicate full conformance with the ANSI C Standard. |
Note
- There are two (2) leading and trailing underscore characters ('_') used for the predefined constants.
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