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showing lines actually parsed

From: David Boyce
Subject: showing lines actually parsed
Date: Tue, 3 Jul 2018 07:13:00 -0700

I've been wondering how hard it would be to add a "--debug=l (lines)" (or maybe "p/parsed or s/serialize") option to "straighten out" conditionals by printing only the lines actually parsed. The effect would be to take a potentially very complex makefile suite with many includes and conditional branches, or possibly both as in "$(if $(FOO),$(eval include $(FILE)))", and show one valid path through them. The goal would be not to produce a working makefile, though I don't know why it wouldn't work, but to help analyze and understand a complex legacy system. It feels like this should be doable just by adding a conditional printf() in the right place. True?


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