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Second invocation of macro actually runs the macro twice, so local
forward definitions get resolved correctly. This means that macro
bodies get 3 passes made on them. Far from pretty, but it does the
job. See execute_macro(), and new function execute_body().
Restore cblock value to 0 at start of 2nd pass.
Accept CBLOCK headers without an expression: continues at previous
CBLOCK value. See gpasm.y.
Accept CBLOCK values as labels, with or without an expression. See gpasm.y.
Do #define substitution. Done in the lexical analyser, using the same
stack that we use for include files. Still no support for parameters
in #define. See scan.l.
Evaluate '$' late, instead of at parse time.
Missing parameter to bit operations was giving coredump instead of
error message.
Makefile now builds with "gcc -Wall --pedantic", had a general cleanup
following this.
Small fix to lexical analyser to make it cope with MSDOS '\r'
characters.
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