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cmakefile
Chan Kim
Chan Kim

Reputation: 5959

In Makefile, how to make wildcard function work for files in all the paths set by VPATH variable

I have two files as below (from tree command).

.
|-- Makefile
|-- dir1
|   `-- file1.c
`-- dir2
    `-- file2.c

I wanted to compiles files in dir1 and dir2 directory so I wrote a Makefile as below.

VPATH = dir1:dir2
CFILES := ${wildcard *.v}
$(info CFILES = ${CFILES})

output : 

CFILES =

So the wildcar function doesn't automatically search paths set by the VPATH variable.
If I specifically write the path in the wildcard function, it works.

CFILES := ${wildcard dir1/*.c dir2/*.c}   <== this makes it work
$(info CFILES = ${CFILES})

output : 

CFILES = dir1/file1.c dir2/file2.c

I want to add only the existing paths to the Makefile but is there any way that I can use wildcard function for paths set by VPATH? (Suppose I need to remove some files from compile list so I need the files list. Just curious..)

Upvotes: 1

Views: 1742

Answers (1)

TrentP
TrentP

Reputation: 4692

You can use Make's text transformation functions to turn a list of directories into your desired wildcard command. Take a look at the GNU Make manual, they even use extracting the directories of VPATH in their examples. Consider something like:

$(wildcard $(addsuffix /*.c,$(subst :, ,$(VPATH))

Since you get the full path to the file via wildcard, it seems like using VPATH shouldn't be necessary. IMHO, VPATH is a bad idea and well designed build system don't use it.

Also consider what you want to happen if files with the same name appear in different directories!

Upvotes: 1

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