Syntax format:
IMPORT symbol{[WEAK]}
Where symbol is the name of the declared symbol. It is case sensitive.
[WEAK] After specifying this option, if the symbol is not defined in all source files, the compiler will not generate any error message, and the compiler will not search for the symbol in the library that is not currently included.
Instructions for use:
Use the IMPORT pseudo-operation to declare that a symbol is defined in another source file. If the connector cannot resolve the symbol during the link process and the [WEAK] option is not specified in the IMPORT pseudo-operation, the connector will report an error. If the connector cannot resolve the symbol during the link process and the [WEAK] option is specified in the IMPORT pseudo-operation, the connector will not report an error, but will do the following:
- If the symbol is referenced by a B or BL instruction, the symbol is set to the address of the next instruction, and the B or BL instruction is equivalent to a NOP instruction.
- Otherwise the sign is set to 0
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Professor at Beihang University, dedicated to promoting microcontrollers and embedded systems for over 20 years.
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