The command line option -g specifies generation of debugging information for GDB, the GNU debugger. GDB comes with its own documentation. Currently, GDB does not understand Pascal syntax, so you should be familiar with C expressions if you want to use it.
See also “Notes for debugging” in the “Programming” chapter; see Notes for Debugging.
Sometimes it is nice to have a look at the assembler output of the
compiler. You can do this in a debugger or disassembler (which is
the only way to do it in BP), but you can also tell GPC to produce
assembler code directly: When you specify the
-S command line
option, GPC produces an
.s file instead of an
.s file contains assembler source for your program. More
about this in the next section.