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Help => General => Topic started by: Macron on February 24, 2015, 06:06:42 pm

Title: Android - Undefined reference to functions which are using string
Post by: Macron on February 24, 2015, 06:06:42 pm

Hi. I wanted to make app on Android, so I downloaded SFML<andfixes branch>, got it compiled and made project from example files. But when I build it with ndk-build, I get these errors:

(click to show/hide)

jni/main.cpp:11: error: undefined reference to 'sf::String::String(char const*, std::__1::locale const&)'
jni/main.cpp:13: error: undefined reference to 'sf::Texture::loadFromFile(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, sf::Rect<int> const&)'
jni/main.cpp:20: error: undefined reference to 'sf::Music::openFromFile(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&)'

My Android.mk:

(click to show/hide)

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE    := sfml-example

LOCAL_SRC_FILES := main.cpp
LOCAL_LDLIBS := -llog -landroid -lEGL

LOCAL_STATIC_LIBRARIES := sfml-main

LOCAL_SHARED_LIBRARIES := sfml-system
LOCAL_SHARED_LIBRARIES += sfml-window
LOCAL_SHARED_LIBRARIES += sfml-graphics
LOCAL_SHARED_LIBRARIES += sfml-audio
LOCAL_SHARED_LIBRARIES += sfml-network



LOCAL_STATIC_LIBRARIES += android_native_app_glue
include $(BUILD_SHARED_LIBRARY)


$(call import-module,sfml)
 

and my Application.mk

(click to show/hide)

NDK_TOOLCHAIN_VERSION := 4.8
APP_PLATFORM := android-9
APP_STL := c++_shared
APP_ABI := armeabi
APP_CPPFLAGS := -std=c++0x
APP_MODULES := sfml-activity sfml-example
 

Code is SFML example.
If I compile with another APP_STL option, apk gets compiled, but doesn't want to work.

Title: Re: Android - Undefined reference to functions which are using string
Post by: ChronicRat on February 24, 2015, 07:50:45 pm

Try "gnustl"

Title: Re: Android - Undefined reference to functions which are using string
Post by: Macron on February 24, 2015, 09:33:36 pm

With gnustl_shared I get

sfml-activity(2546): sfml-activity: Undefined symbol ANativeActivity_onCreate

and with gnustl_static I get errors:

 dlopen("/data/app-lib/com.example.sfml-1/libgnustl_shared.so"): Cannot load library: load_library(linker.cpp:745): library "/data/app-lib/com.example.sfml-1/libgnustl_shared.so" not found
 

.

Title: Re: Android - Undefined reference to functions which are using string
Post by: ChronicRat on February 25, 2015, 06:37:54 am

Try something like this:
SFMLActivity.cpp

   // Load our libraries in reverse order
    //loadLibrary("c++_shared", lJNIEnv, ObjectActivityInfo);
    loadLibrary("sndfile", lJNIEnv, ObjectActivityInfo);
    loadLibrary("openal", lJNIEnv, ObjectActivityInfo);
 

If you using static stl, so you don't need to 'loadLibrary' for it.

Title: Re: Android - Undefined reference to functions which are using string
Post by: binary1248 on February 25, 2015, 08:12:29 am

Might be library ordering (http://www.sfml-dev.org/faq.php#build-link). Change it in your Android.mk and see if it makes a difference.

Title: Re: Android - Undefined reference to functions which are using string
Post by: Macron on February 25, 2015, 05:00:05 pm

@ChronicRat With that, I still get

sfml-activity: Undefined symbol ANativeActivity_onCreate
 

error.
@binary1248 Nothing seems to change with other library order.

Title: Re: Android - Undefined reference to functions which are using string
Post by: ChronicRat on February 25, 2015, 06:44:16 pm

Use "LOCAL_WHOLE_STATIC_LIBRARIES" instead of "LOCAL_STATIC_LIBRARIES" where sfml-main in Android.mk.

Title: Re: Android - Undefined reference to functions which are using string
Post by: Macron on February 25, 2015, 08:16:59 pm

Thank you @ChronicRat very much, that worked :)!