Makefile fragment for printing all MAKE variables

Makefile

# debug support

# escape single quotes
SQ = '$(subst ','\'',$(1))'

# simple "name = value" list
print_vars = printf '%s\n' $(foreach v,$(sort ${.VARIABLES}),'$v = '$(call SQ,$($v)))

# TAB-separated list of "name origin value1 value2", where
# value1 is the unexpanded value, and value2 is the expanded value.
# Watch out for embedded TABs below!
print_rawvars = printf '%s\n' $(foreach v,$(sort ${.VARIABLES}),'$v	$(origin $v)	'$(call SQ,$(value $v))'	'$(call SQ,$($v))')