Analog Devices VisualDSP++ 3.5 Manual page 88

The linker runs the preprocessor on the . file, so you can use
LDF
preprocessor commands (such as ) within the file. For
#defines
information about preprocessor commands, refer to a VisualDSP++
3.5 Assembler and Preprocessor Manual for an appropriate target
processor architecture.
Assembler section declarations in this document correspond to the
Blackfin assembler's directive.
.SECTION
Refer to example DSP programs shipped with VisualDSP++ for
sample files supporting typical system models.
.LDF
3-2 VisualDSP++ 3.5 Linker and Utilities Manual
for 16-Bit Processors