makefile - How to correctly escape "%" sign when using pattern rules and patsubst in GNU make? -


i have makefile following:

m1:     @echo building m1  m1_:     @echo building m1_   m2:     @echo building m2  m2_:     @echo building m2_  m3_deps = m2 m1  substitute=$(patsubst %,%_,$($@_deps)) .secondexpansion:  #%: $$(substitute) %:  $$(patsubst \%,\%_,$$($$@_deps))     @echo building $@     @echo dependencies $^

the key line is

%:  $$(patsubst \%,\%_,$$($$@_deps))

i using both pattern rule , patsubst, uses percentage signs. thought escape % character \, still not getting expected behaviour. running "make m3" gives output

building m2 building m1 building m3 dependencies m2 m1

however, expect get

building m2_ building m1_ building m3 dependencies m2_ m1_

commenting out line , calling patsubst indirectly through variable in fact produce output.

substitute=$(patsubst %,%_,$($@_deps))  %: $$(substitute)

also, have tested using non-pattern rule works, makes me think interaction of pattern rules , percentage signs:

m3:  $$(patsubst %,%_,$$($$@_deps))

\ in makefile context line continuation, not "escaping". escape things hide them in variable:

percent := %

the idea is, @ time makefile fragment parsed escaped character meaningful, escape it.

so, in situation, have use $$(percent):

$$(patsubst $$(percent),$$(percent)_,$$($$@_deps))


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