Summary

With ca65, using -x / --expand-macros without -l / --listing will cause a segmentation fault when expending a macro:

;test.s
.macro test_mac

.endmacro

test_mac

Running

$ ca65 -x test.s

will result in a segmentation fault.
This is also the case with .define.

This fix will make -x have no effect if -l is omitted.

Checklist

• The fix meets the codestyle requirements
• New unit tests have been added to prevent future regressions
• The documentation has been updated if necessary