"undefined reference to bsd_signal" error on Android Studio 2.1

[Diane Cordero]

Hi everyone,

I am working on migrating my Android Eclipse project to Android Studio 2.1 using Android NDK v12 and Gradle 2.2.1.

Below is the error I see when trying to compile the GStreamer library (version 1.8.1):

GStreamer      : [GEN] => gst-build-armeabi-v7a/gstreamer_android.c
GStreamer      : [COMPILE] => gst-build-armeabi-v7a/gstreamer_android.c
GStreamer      : [LINK] => gst-build-armeabi-v7a/libgstreamer_android.so

/home/slomo/cerbero/android-ndk-r11/platforms/android-9/arch-arm/usr/include/signal.h:113: error: undefined reference to 'bsd_signal'
/home/slomo/cerbero/android-ndk-r11/platforms/android-9/arch-arm/usr/include/signal.h:113: error: undefined reference to 'bsd_signal'
/home/slomo/cerbero/android-ndk-r11/platforms/android-9/arch-arm/usr/include/signal.h:113: error: undefined reference to 'bsd_signal'
/home/slomo/cerbero/android-ndk-r11/platforms/android-9/arch-arm/usr/include/signal.h:113: error: undefined reference to 'bsd_signal'
collect2: error: ld returned 1 exit status

Why does it reference API level 9? Is this error based on changes to the Android NDK? If so, is there a patch I can apply to get around this error?

As a side question, are GStreamer releases tested on Android Studio? And what is the connection between android-ndk-r11 and the Android NDK used by Android Studio?

Application.mk

APP_ABI := armeabi-v7a
APP_PLATFORM := android-21


Android.mk:

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE    := Pixa
LOCAL_SRC_FILES := Pixa.c
LOCAL_SHARED_LIBRARIES := gstreamer_android
LOCAL_LDLIBS := -llog -landroid
include $(BUILD_SHARED_LIBRARY)

ifndef GSTREAMER_ROOT
ifndef GSTREAMER_ROOT_ANDROID
#$(error GSTREAMER_ROOT_ANDROID is not defined!)
GSTREAMER_ROOT_ANDROID := /home/sbis-android/Android/Installation/gstreamer-1.0-android-armv7-1.8.1
endif
GSTREAMER_ROOT        := $(GSTREAMER_ROOT_ANDROID)
endif
GSTREAMER_NDK_BUILD_PATH  := $(GSTREAMER_ROOT)/share/gst-android/ndk-build
include $(GSTREAMER_NDK_BUILD_PATH)/plugins.mk
GSTREAMER_PLUGINS         := $(GSTREAMER_PLUGINS_CORE) $(GSTREAMER_PLUGINS_SYS) $(GSTREAMER_PLUGINS_EFFECTS) $(GSTREAMER_PLUGINS_CODECS_RESTRICTED) $(GSTREAMER_PLUGINS_CODECS) $(GSTREAMER_PLUGINS_NET) $(GSTREAMER_PLUGINS_PLAYBACK)  $(GSTREAMER_AGGREGATE_TOP)
GSTREAMER_EXTRA_DEPS      := gstreamer-video-1.0
include $(GSTREAMER_NDK_BUILD_PATH)/gstreamer-1.0.mk


Gradle task:

task ndkBuild(type: Exec, description: 'Compile JNI source via NDK') {
    def ndkDir = project.plugins.findPlugin('com.android.application').getNdkFolder()
    println(project.plugins.findPlugin('com.android.application').getNdkFolder())

    commandLine "$ndkDir/ndk-build",
            'NDK_PROJECT_PATH=build',
            'APP_BUILD_SCRIPT=src/main/jni/Android.mk',
            'NDK_APPLICATION_MK=src/main/jni/Application.mk'
}

Thanks!


Diane Cordero
Software Engineer
340 Storke Road, Suite 101
Goleta, CA 93117
P 805.252.1366

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