Problems with includes when migrating to experimental gradle Android Studio 2.0+ - c

Question

My problem goes beyond of what the title says so will give a background before the question. I've been experimenting issues since I updated from Android Studio 1.5 to 2.0 (now using 2.1.1 Stable, tried beta version as well)
Background
When I updated my Android Studio and opened c files in NDK y started receiving the following message:
This message appears even though I have already synced the project.
The compiler was working fine, as I could ignore modify things in c and it would still compile. Then I tried to add a new include of a file created by me which contains some settings and methods, the same file is included in other files working well. However, this time the compiler throws me the following error:
error: undefined reference to 'my_method'
Spent quite a while debugging but was unsuccessful, so decided to migrate to experimental gradle where this problem does not happen.
Here is what I'm using now:
- gradle-experimental:0.7.0
- wraper: gradle-2.10-all.zip
My gradle file is this:
apply plugin: 'com.android.model.application'
import org.apache.tools.ant.taskdefs.condition.Os
model {
android {
compileSdkVersion 23
buildToolsVersion "23.0.3"
defaultConfig.with {
applicationId "com.domain.myapp"
minSdkVersion.apiLevel 15
targetSdkVersion.apiLevel 23
versionCode 1
versionName "1.0"
}
tasks.withType(JavaCompile) {
compileTask -> compileTask.dependsOn ndkBuild
}
task ndkBuild(type: Exec) {
if (Os.isFamily(Os.FAMILY_WINDOWS)) {
commandLine 'ndk-build.cmd', '-C', file('src/main').absolutePath
}
}
}
task runSwig(type: Exec, description: 'Run swig config') {
workingDir 'src/main'
commandLine 'cmd', '/c', 'swig.bat'
}
ndk {
moduleName "MyNativeModule"
//toolchain "clang"
}
sources.main {
jni {
source {
srcDir 'src/main/libs' //set .so files location to libs
srcDirs = [] //disable automatic ndk-build call
}
}
}
buildTypes {
debug {
debuggable true
ndk.with {
debuggable = true
}
versionNameSuffix "1.0"
}
}
}
repositories {
maven { url "https://jitpack.io" }
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.4.0'
compile 'com.android.support:design:23.4.0'
compile 'org.litepal.android:core:1.2.1'
}
Now, when I run clean it finishes successfully, but..
Now the problem:
*I'm using a libusb library
When I try to build, I get the following errors:
-Error:(20, 20) config.h: No such file or directory
-Error:(33, 30) libkern/OSAtomic.h: No such file or directory
-Error:(29, 25) dev/usb/usb.h: No such file or directory
... many others like these
In the case of config.h in the library it's included like this:
#include <config.h>
so since I have that file in a parent directory in the library, I managed to make it work this way:
#include "../config.h>
On the other hand for the other files, I don't have the directories nor the files in the library so I cannot reference them. Besides, I see these files belong to MacOS when I google them.
With standard gradle this is not a problem as it compiles like a charm!
My questions are:
Why is this happening? is there some compilation flag I'm missing to ignore these files?
How can I fix this issue, what would be the best approach?
What I've already tried:
Update NDK from 11 to 12
Switch from stable Android Studio to Beta channel and back
Tried different gradle versions stable and experimental
As I'm getting familiar with NDK and C my question might be to obvios, any help will be much appreciated!
Update
I'm building libusb library as I made some changes to it. (with stable gradle this works fine except for the problem I described above, before the update I have been using this setup for a few months, everything working as expected)
My directory structure is as follows:
-jni
-jni/myUSB/libusb
Here are my Android.mk files so you see how I'm building them:
jni:
LOCAL_PATH := $(call my-dir)
ROOT_PATH := $(LOCAL_PATH)
include $(call all-subdir-makefiles)
LOCAL_PATH := $(ROOT_PATH)
include $(CLEAR_VARS)
LOCAL_MODULE := myModuleName
LOCAL_CFLAGS := -O2 -ffast-math
LOCAL_LDLIBS := -llog
LOCAL_SRC_FILES := \
jiw.cpp \
mainFile.c \
otherFile.c
LOCAL_C_INCLUDES := $(LOCAL_PATH)/
LOCAL_SHARED_LIBRARIES := myUSB
include $(BUILD_SHARED_LIBRARY)
myUSB:
LOCAL_PATH := $(call my-dir)
ROOTUSB_PATH := $(LOCAL_PATH)
include $(call all-subdir-makefiles)
LOCAL_PATH := $(ROOTUSB_PATH)
include $(CLEAR_VARS)
LOCAL_MODULE := myUSB
LOCAL_CFLAGS := -O2 -ffast-math
LOCAL_LDLIBS := -llog -pthread
LOCAL_SRC_FILES := \
myUsbMainFile.c \
myUsbInterface.c \
LOCAL_C_INCLUDES := \
$(LOCAL_PATH)/
LOCAL_SHARED_LIBRARIES := android-usb
include $(BUILD_SHARED_LIBRARY)
libusb:
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := android-usb
LOCAL_CFLAGS := -O2 -ffast-math
LOCAL_LDLIBS := -llog
LOCAL_SRC_FILES := \
core.c \
descriptor.c \
io.c \
sync.c \
os/linux_usbfs.c \
os/threads_posix.c \
os/android_java.c
LOCAL_C_INCLUDES := \
$(LOCAL_PATH)/ \
$(LOCAL_PATH)/os
include $(BUILD_SHARED_LIBRARY)

Answer 1

I can't see, where you connect libusb to your project. So, you probably have to link it manually. Here is an example, how to link libraries statically/dynamically in build.gradle.