Sources from subdirectories in Makefile

ggambett_39301 0
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I have a C++ library built using a Makefile. Until recently, all the sources were in a single directory, and the Makefile did something like this

SOURCES = $(wildcard *.cpp)

which worked fine.

Now I've added some sources that are in a subdirectory, say subdir. I know I can do this

SOURCES = $(wildcard *.cpp) $(wildcard subdir/*.cpp)

but I'm looking for a way to avoid specifying subdir manually, that is, make wildcard look into subdirectories, or generating a list of subdirectories somehow and expanding it with several wildcard functions. At this point, having a non-recursive solution (that is, expanding only the first level) would be fine.

I haven't found anything - my best guess is using find -type d to list the subdirectories, but it feels like a hack. Is there any built-in way to do this?

makefile
6 Answers

You can use several rules in wildcard:

SOURCES := $(wildcard *.cpp */*.cpp)

if you need more depth:

SOURCES := $(wildcard *.cpp */*.cpp */*/*.cpp */*/*/*.cpp)

Unfortunately, and unlike what we sometimes read, glob (**) is not supported by makefile and will be interpreted as normal wildcard (*).

For example **/*.cpp match dir/file.cpp but neither file.cpp nor dir/sub/file.cpp.

If you need infinite depth use shell:

SOURCES := $(shell find . -name "*.cpp")
user_8061690

If you can use find shell command, you may define a function to use it.

recurfind = $(shell find $(1) -name '$(2)')
SRCS := $(call recurfind,subdir1,*.c) $(call recurfind,subdir2,*.cc) $(call recurfind,subdir2,*.cu) \
        ...
user_1224230
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