Question

I have a pattern which I use with wildcard in order to find files. The pattern is specified in a variable as it is intended to be configurable (it’s in an included makefile). I then need to use the same pattern with patsubst. Is there an easy way switch the * for a %? Obviously there could only be one * in the wildcard pattern.

So, for example, if my wildcard pattern is *.c then I would like to obtain the pattern %.c

This would also need to work for the the following wildcard patterns:

WILD := *.c *.s *.S
WILD := prefix_*.suffix

I had a solution for the first case, where I am just working with extensions, which is to use patsubst itself:

PATSUBST_PATTERN := $(patsubst *.%,\%.%,$(WILD))

Can anyone suggest a way to do this where the * is not at the start of the wildcard pattern?

Answer 1

What about

WILD := *.c *.s *.S prefix_*.suffix
PATSUBST_PATTERN := $(subst *,%,$(WILD))
$(info $(PATSUBST_PATTERN))

Output:

%.c %.s %.S prefix_%.suffix