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BL51 User's Guide
BL51 Introduction Purpose of the Linker 
Combining Modules Searching Libraries Combining Segments Locating Segments Overlaying Data Memory Resolving External References Calculating Addresses Generating an Object File Generating a Listing File Segments Memory Areas BIT, DATA, and IDATA CODE and CONST XDATA 
Linking Programs Locating Segments Data Overlaying Code Banking Real-Time Programs Error MessagesSearching Libraries
The BL51 Linker searches for libraries specified on the command line and for libraries specified in an object module. When a Compiler creates an object module from a high-level-language program (like C) the names of the default libraries are included in that object module. The linker uses the same method to find library files no matter how they are specified.
If the library file includes a path specification, the linker searches for that library only in the specified path. Libraries specified by object modules do not include path specifications.
If a library file does not include a path specification, the linker searches for it in:
- the current folder,
- the folders specified with the C51LIB environment variable.
Object files created by the compiler typically contain the names of the required standard libraries. Additional library specifications are not needed unless you want to:
- include modules from additional libraries,
- search for libraries in a different location,
- override use of the default libraries.
Refer to the Input Modules section of the Map File to determine what libraries are included in a program.
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