Android.mk, include all cpp files

Question

I'm trying to build an Android project using the ndk, but I have run into some troubles.

Here's the Android.mk file that works:

LOCAL_PATH:= $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE    := mylib
LOCAL_CFLAGS    := -Werror
LOCAL_SRC_FILES := main.cpp, Screen.cpp, ScreenManager.cpp  
LOCAL_LDLIBS    := -llog

include $(BUILD_SHARED_LIBRARY)

Is there a way that allows me to specify all the *.cpp files in the directory, without listing them manually under LOCAL_SRC_FILES?

So far I tried using LOCAL_SRC_FILES = $(wildcard *.cpp), but it did now work, it seems that no files get selected.

score 76 · Accepted Answer · answered Jan 24 '12 at 00:10

76

You could try something like this...

FILE_LIST := $(wildcard $(LOCAL_PATH)/[DIRECTORY]/*.cpp)
LOCAL_SRC_FILES := $(FILE_LIST:$(LOCAL_PATH)/%=%)

... Change [DIRECTORY] to the actual directory of the files. If they are in the same directory as your .mk file then remove that part. Create the FILE_LIST variable to find all of the .cpp files under the [DIRECTORY] directory. Then use it in the file listing. The LOCAL_SRC_FILES line will then remove the LOCAL_PATH from the listing.

answered Jan 24 '12 at 00:10

DRiFTy

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1

@DiscGolfer Why you remove `LOCAL_PATH` from the listing? – Narek May 30 '14 at 23:27
1

@Narek You must define `LOCAL_PATH := $(call my-dir)` at the top of your `Android.mk`. This holds the relative path from your NDK root to the current file. So, in the `LOCAL_SRC_FILES` line above, I removed the `LOCAL_PATH` from the listing because the file paths are relative to `LOCAL_PATH`. Which would make the paths invalid if not removed. – DRiFTy May 31 '14 at 00:25
What does the "wildcard" part mean? Makes sense that LOCAL_PATH will get expanded into a path, is "wildard" a predefined value? Is something supposed to be substituted for "wildcard"? – Alyoshak Oct 02 '14 at 03:45
@Alyoshak The wildcard keyword is a standard makefile function that matches and creates a list of filenames based on the pattern we give it. The only part you need to modify is the pattern being used (aka the path to your .cpp files) – DRiFTy Oct 02 '14 at 10:46
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What does $(FILE_LIST:$(LOCAL_PATH)/%=%) mean? – Sergei Vasilenko Nov 04 '16 at 10:48
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@Delargo This removes the `LOCAL_PATH` from each file path in the `FILE_LIST`. Itbasically makes the `LOCAL_SRC_FILES` list contain only relative paths to your files. – DRiFTy Nov 16 '16 at 17:11

NiTe Luo · Answer 2 · 2015-04-15T23:31:17.843

22

I've been using this script for my Android.mk saved me so much time!

#traverse all the directory and subdirectory
define walk
  $(wildcard $(1)) $(foreach e, $(wildcard $(1)/*), $(call walk, $(e)))
endef

#find all the file recursively under jni/
ALLFILES = $(call walk, $(LOCAL_PATH))
FILE_LIST := $(filter %.cpp, $(ALLFILES))

LOCAL_SRC_FILES := $(FILE_LIST:$(LOCAL_PATH)/%=%)

Here is the gist

edited Apr 15 '15 at 23:31

answered Apr 30 '13 at 22:00

NiTe Luo

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To anybody using this, make sure that this definition is placed in your Makefile _before_ any code that uses it, otherwise calls to it will silently fail. – Christopher Orr Feb 19 '16 at 15:53
just a note , this is the perfect solution – Hassen Dhia Sep 11 '16 at 11:22
How exclude path from FILE_LIST? And why write $(FILE_LIST:$(LOCAL_PATH)/%=%), not just $(FILE_LIST) when I assign FILE_LIST to LOCAL_SRC_FILES? – Sergei Vasilenko Nov 04 '16 at 10:47

score 3 · Answer 3 · answered May 07 '13 at 02:54

How about like this:

LOCAL_SRC_FILES := $(subst $(LOCAL_PATH)/,,$(wildcard $(LOCAL_PATH)/*.cpp))

If you'd be afraid that expansion of * contains $(LOCAL_PATH)/, it might be OK:

LOCAL_SRC_FILES := $(subst $(LOCAL_PATH)/./,,$(wildcard $(LOCAL_PATH)/./*.cpp))

score 0 · Answer 4 · answered Feb 20 '20 at 07:28

0

Using this:

LOCAL_SRC_FILES += $($(wildcard $(LOCAL_PATH)/*.cpp):$(LOCAL_PATH)/%=%)

answered Feb 20 '20 at 07:28

赵国涛

1

Android.mk, include all cpp files

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