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Compiling a library for Android

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  • V Offline
    V Offline
    vlada
    wrote on last edited by
    #1

    Hi,

    I would like to use MediaInfo library in my application on Android.

    There is no official Android support for this library but some people successfully compiled it. I downloaded the source-code and tried to compile it. I was able to create a libmediainfo.a static library. But I would like to build a shared (.so) library instead. How can I instruct QtCreator to do it?

    Thank you.

    1 Reply Last reply
    0
    • SGaistS Offline
      SGaistS Offline
      SGaist
      Lifetime Qt Champion
      wrote on last edited by
      #2

      Hi,

      What build system is used for Mediainfo ?

      Interested in AI ? www.idiap.ch
      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

      1 Reply Last reply
      0
      • V Offline
        V Offline
        vlada
        wrote on last edited by
        #3

        By default it uses automake. After some trials I think I just need to comment out this line:

        CONFIG += staticlib
        

        Is this correct? Further I run into many dependencies problems but I do believe that QtCreator now tries to compile a dynamic library.

        raven-worxR 1 Reply Last reply
        0
        • V vlada

          By default it uses automake. After some trials I think I just need to comment out this line:

          CONFIG += staticlib
          

          Is this correct? Further I run into many dependencies problems but I do believe that QtCreator now tries to compile a dynamic library.

          raven-worxR Offline
          raven-worxR Offline
          raven-worx
          Moderators
          wrote on last edited by
          #4

          @vlada said in Compiling a library for Android:

          Is this correct?

          yes.

          Further I run into many dependencies problems but I do believe that QtCreator now tries to compile a dynamic library.

          When compiling a static library the application/library including the static library has to make sure the dependencies are also linked.
          Since you now compile a dynamic library you now already have to provide and link the dependencies (static or also dynamic).

          --- SUPPORT REQUESTS VIA CHAT WILL BE IGNORED ---
          If you have a question please use the forum so others can benefit from the solution in the future

          1 Reply Last reply
          1
          • V Offline
            V Offline
            vlada
            wrote on last edited by
            #5

            OK, now it is much more clear to me. So I have to compile also the other dependencies first and then create the shared library.

            Now I found that someone already managed to compile the library for Android. I found it here.

            So I tried to use it but I got this error:

            D/dalvikvm( 1347): Trying to load lib /data/app-lib/org.qtproject.muzika-2/libmediainfo.so 0xb3d2cbf0
            D/dalvikvm( 1347): Added shared lib /data/app-lib/org.qtproject.muzika-2/libmediainfo.so 0xb3d2cbf0
            E/libmediainfo-jni( 1347): Native registration unable to find class 'org/mediainfo/android/MediaInfo'!
            W/System.err( 1347): java.lang.reflect.InvocationTargetException
            W/System.err( 1347): at java.lang.reflect.Method.invokeNative(Native Method)
            W/System.err( 1347): at java.lang.reflect.Method.invoke(Method.java:515)
            W/System.err( 1347): at org.qtproject.qt5.android.bindings.QtLoader.loadApplication(QtLoader.java:237)
            W/System.err( 1347): at org.qtproject.qt5.android.bindings.QtLoader.startApp(QtLoader.java:647)
            W/System.err( 1347): at org.qtproject.qt5.android.bindings.QtActivityLoader.onCreate(QtActivityLoader.java:181)
            W/System.err( 1347): at org.qtproject.qt5.android.bindings.QtActivity.onCreate(QtActivity.java:269)
            W/System.err( 1347): at android.app.Activity.performCreate(Activity.java:5231)
            W/System.err( 1347): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
            W/System.err( 1347): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
            W/System.err( 1347): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
            W/System.err( 1347): at android.app.ActivityThread.access$800(ActivityThread.java:135)
            W/System.err( 1347): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
            W/System.err( 1347): at android.os.Handler.dispatchMessage(Handler.java:102)
            W/System.err( 1347): at android.os.Looper.loop(Looper.java:136)
            W/System.err( 1347): at android.app.ActivityThread.main(ActivityThread.java:5017)
            W/System.err( 1347): at java.lang.reflect.Method.invokeNative(Native Method)
            W/System.err( 1347): at java.lang.reflect.Method.invoke(Method.java:515)
            W/System.err( 1347): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
            W/System.err( 1347): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
            W/System.err( 1347): at dalvik.system.NativeStart.main(Native Method)
            W/System.err( 1347): Caused by: java.lang.NoClassDefFoundError: org/mediainfo/android/MediaInfo
            W/System.err( 1347): at java.lang.Runtime.nativeLoad(Native Method)
            W/System.err( 1347): at java.lang.Runtime.doLoad(Runtime.java:421)
            W/System.err( 1347): at java.lang.Runtime.load(Runtime.java:331)
            W/System.err( 1347): at java.lang.System.load(System.java:512)
            W/System.err( 1347): at org.qtproject.qt5.android.QtNative.loadBundledLibraries(QtNative.java:190)
            W/System.err( 1347): at org.qtproject.qt5.android.QtActivityDelegate.loadApplication(QtActivityDelegate.java:504)
            W/System.err( 1347): ... 20 more
            W/System.err( 1347): Caused by: java.lang.ClassNotFoundException: Didn't find class "org.mediainfo.android.MediaInfo" on path: DexPathList[[zip file "/data/app/org.qtproject.muzika-2.apk"],nativeLibraryDirectories=[/data/app-lib/org.qtproject.muzika-2, /vendor/lib, /system/lib]]
            W/System.err( 1347): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
            W/System.err( 1347): at java.lang.ClassLoader.loadClass(ClassLoader.java:497)
            W/System.err( 1347): at java.lang.ClassLoader.loadClass(ClassLoader.java:457)
            W/System.err( 1347): ... 26 more

            I don't understand very well what's going on here. It looks like the main application can not find the library. I checked the APK and the libmediainfo.so in in the directory lib/armeabi-v7a like all other shared libraries.

            raven-worxR 1 Reply Last reply
            0
            • V vlada

              OK, now it is much more clear to me. So I have to compile also the other dependencies first and then create the shared library.

              Now I found that someone already managed to compile the library for Android. I found it here.

              So I tried to use it but I got this error:

              D/dalvikvm( 1347): Trying to load lib /data/app-lib/org.qtproject.muzika-2/libmediainfo.so 0xb3d2cbf0
              D/dalvikvm( 1347): Added shared lib /data/app-lib/org.qtproject.muzika-2/libmediainfo.so 0xb3d2cbf0
              E/libmediainfo-jni( 1347): Native registration unable to find class 'org/mediainfo/android/MediaInfo'!
              W/System.err( 1347): java.lang.reflect.InvocationTargetException
              W/System.err( 1347): at java.lang.reflect.Method.invokeNative(Native Method)
              W/System.err( 1347): at java.lang.reflect.Method.invoke(Method.java:515)
              W/System.err( 1347): at org.qtproject.qt5.android.bindings.QtLoader.loadApplication(QtLoader.java:237)
              W/System.err( 1347): at org.qtproject.qt5.android.bindings.QtLoader.startApp(QtLoader.java:647)
              W/System.err( 1347): at org.qtproject.qt5.android.bindings.QtActivityLoader.onCreate(QtActivityLoader.java:181)
              W/System.err( 1347): at org.qtproject.qt5.android.bindings.QtActivity.onCreate(QtActivity.java:269)
              W/System.err( 1347): at android.app.Activity.performCreate(Activity.java:5231)
              W/System.err( 1347): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
              W/System.err( 1347): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
              W/System.err( 1347): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
              W/System.err( 1347): at android.app.ActivityThread.access$800(ActivityThread.java:135)
              W/System.err( 1347): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
              W/System.err( 1347): at android.os.Handler.dispatchMessage(Handler.java:102)
              W/System.err( 1347): at android.os.Looper.loop(Looper.java:136)
              W/System.err( 1347): at android.app.ActivityThread.main(ActivityThread.java:5017)
              W/System.err( 1347): at java.lang.reflect.Method.invokeNative(Native Method)
              W/System.err( 1347): at java.lang.reflect.Method.invoke(Method.java:515)
              W/System.err( 1347): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
              W/System.err( 1347): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
              W/System.err( 1347): at dalvik.system.NativeStart.main(Native Method)
              W/System.err( 1347): Caused by: java.lang.NoClassDefFoundError: org/mediainfo/android/MediaInfo
              W/System.err( 1347): at java.lang.Runtime.nativeLoad(Native Method)
              W/System.err( 1347): at java.lang.Runtime.doLoad(Runtime.java:421)
              W/System.err( 1347): at java.lang.Runtime.load(Runtime.java:331)
              W/System.err( 1347): at java.lang.System.load(System.java:512)
              W/System.err( 1347): at org.qtproject.qt5.android.QtNative.loadBundledLibraries(QtNative.java:190)
              W/System.err( 1347): at org.qtproject.qt5.android.QtActivityDelegate.loadApplication(QtActivityDelegate.java:504)
              W/System.err( 1347): ... 20 more
              W/System.err( 1347): Caused by: java.lang.ClassNotFoundException: Didn't find class "org.mediainfo.android.MediaInfo" on path: DexPathList[[zip file "/data/app/org.qtproject.muzika-2.apk"],nativeLibraryDirectories=[/data/app-lib/org.qtproject.muzika-2, /vendor/lib, /system/lib]]
              W/System.err( 1347): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
              W/System.err( 1347): at java.lang.ClassLoader.loadClass(ClassLoader.java:497)
              W/System.err( 1347): at java.lang.ClassLoader.loadClass(ClassLoader.java:457)
              W/System.err( 1347): ... 26 more

              I don't understand very well what's going on here. It looks like the main application can not find the library. I checked the APK and the libmediainfo.so in in the directory lib/armeabi-v7a like all other shared libraries.

              raven-worxR Offline
              raven-worxR Offline
              raven-worx
              Moderators
              wrote on last edited by
              #6

              @vlada
              This is a Java related error.
              Caused by: java.lang.NoClassDefFoundError: org/mediainfo/android/MediaInfo

              I don't know what happens in the code, but just from the error message your apk misses the java class org.mediainfo.android.MediaInfo

              --- SUPPORT REQUESTS VIA CHAT WILL BE IGNORED ---
              If you have a question please use the forum so others can benefit from the solution in the future

              1 Reply Last reply
              0
              • V Offline
                V Offline
                vlada
                wrote on last edited by
                #7

                @raven-worx Yes, that is about all I understood too. The error message comes form the Java wrapper in QtCreator. But the library (libmediainfo.so) is there. Where does the library name org.mediainfo.android.MediaInfo comes from?

                I use TagLib the same way without any problems.

                raven-worxR 1 Reply Last reply
                1
                • V vlada

                  @raven-worx Yes, that is about all I understood too. The error message comes form the Java wrapper in QtCreator. But the library (libmediainfo.so) is there. Where does the library name org.mediainfo.android.MediaInfo comes from?

                  I use TagLib the same way without any problems.

                  raven-worxR Offline
                  raven-worxR Offline
                  raven-worx
                  Moderators
                  wrote on last edited by
                  #8

                  @vlada
                  i don't know this library.
                  But it seems you also have to deploy a org.mediainfo.android.MediaInfo Java class in your apk

                  --- SUPPORT REQUESTS VIA CHAT WILL BE IGNORED ---
                  If you have a question please use the forum so others can benefit from the solution in the future

                  1 Reply Last reply
                  0
                  • V Offline
                    V Offline
                    vlada
                    wrote on last edited by
                    #9

                    OK, now I see it. The source also contains a Java wrapper for the library. That is probably needed. But I found another library version from the same author.

                    This seems to work directly. Well at least the application now starts. But when I try to use the library, I get this error: "Unable to load libmediainfo.so.0"

                    Oh no again! I was fighting for many days to fix this error with TagLib. It is caused by the fact that Android doesn't know library versions but Linux on the other hand always creates hard links for these libraries and the programs link against them.

                    Where does the name (with .0 extension) come from? Isn't there any other way to solve it then to compile the library without any version? The project where I took the compiled library from is apparently able to use this library on Android.

                    raven-worxR 1 Reply Last reply
                    1
                    • V vlada

                      OK, now I see it. The source also contains a Java wrapper for the library. That is probably needed. But I found another library version from the same author.

                      This seems to work directly. Well at least the application now starts. But when I try to use the library, I get this error: "Unable to load libmediainfo.so.0"

                      Oh no again! I was fighting for many days to fix this error with TagLib. It is caused by the fact that Android doesn't know library versions but Linux on the other hand always creates hard links for these libraries and the programs link against them.

                      Where does the name (with .0 extension) come from? Isn't there any other way to solve it then to compile the library without any version? The project where I took the compiled library from is apparently able to use this library on Android.

                      raven-worxR Offline
                      raven-worxR Offline
                      raven-worx
                      Moderators
                      wrote on last edited by
                      #10

                      @vlada said in Compiling a library for Android:

                      But when I try to use the library, I get this error: "Unable to load libmediainfo.so.0"

                      did you deploy this lib in the apk?

                      --- SUPPORT REQUESTS VIA CHAT WILL BE IGNORED ---
                      If you have a question please use the forum so others can benefit from the solution in the future

                      1 Reply Last reply
                      2
                      • V Offline
                        V Offline
                        vlada
                        wrote on last edited by vlada
                        #11

                        @raven-worx Yes, the library is included. But it's name is libmediainfo.so. I found it is referenced in the header file so I modified it to include Android specific library name:

                        #if defined(_WIN32) || defined(WIN32)
                            #ifdef _UNICODE
                                #define MEDIAINFODLL_NAME L"MediaInfo.dll"
                            #else //_UNICODE
                                #define MEDIAINFODLL_NAME "MediaInfo.dll"
                            #endif //_UNICODE
                        #elif defined(__APPLE__) && defined(__MACH__)
                            #define MEDIAINFODLL_NAME "libmediainfo.0.dylib"
                            #define __stdcall
                            #ifdef __cplusplus
                                #include <new> //for size_t
                            #else /* __cplusplus */
                                #include <stddef.h> //for size_t
                            #endif /* __cplusplus */
                        #elif defined(ANDROID) || defined(__ANDROID__)
                            #define MEDIAINFODLL_NAME "libmediainfo.so"
                            #define __stdcall
                        #else
                            #define MEDIAINFODLL_NAME "libmediainfo.so.0"
                            #define __stdcall
                        #endif //!defined(_WIN32) || defined(WIN32)
                        

                        Here I added the lines regarding Android. Unfortunately it didn't help. During program execution I get this error:

                        D/dalvikvm( 3296): Trying to load lib /data/app-lib/org.qtproject.muzika-2/libmediainfo.so 0xb3d087b0
                        E/linker ( 3296): "libmediainfo.so": ignoring 2-entry DT_PREINIT_ARRAY in shared library!
                        D/dalvikvm( 3296): Added shared lib /data/app-lib/org.qtproject.muzika-2/libmediainfo.so 0xb3d087b0
                        D/dalvikvm( 3296): No JNI_OnLoad found in /data/app-lib/org.qtproject.muzika-2/libmediainfo.so 0xb3d087b0, skipping init

                        It seems the program can find the library. But when I actually try to use it, I get this error:
                        D/libMuzika.so( 3296): (null):0 ((null)): "Unable to load libmediainfo.so"

                        In the header file (MediaInfoDLL.h) the library is then loaded with this command(s):

                                if (!MediaInfo_Module)
                                    MediaInfo_Module = dlopen(MEDIAINFODLL_NAME, RTLD_LAZY);
                                if (!MediaInfo_Module)
                                    MediaInfo_Module = dlopen("./" MEDIAINFODLL_NAME, RTLD_LAZY);
                        
                        

                        Do you have any idea what the problem could be now?

                        raven-worxR 1 Reply Last reply
                        0
                        • V vlada

                          @raven-worx Yes, the library is included. But it's name is libmediainfo.so. I found it is referenced in the header file so I modified it to include Android specific library name:

                          #if defined(_WIN32) || defined(WIN32)
                              #ifdef _UNICODE
                                  #define MEDIAINFODLL_NAME L"MediaInfo.dll"
                              #else //_UNICODE
                                  #define MEDIAINFODLL_NAME "MediaInfo.dll"
                              #endif //_UNICODE
                          #elif defined(__APPLE__) && defined(__MACH__)
                              #define MEDIAINFODLL_NAME "libmediainfo.0.dylib"
                              #define __stdcall
                              #ifdef __cplusplus
                                  #include <new> //for size_t
                              #else /* __cplusplus */
                                  #include <stddef.h> //for size_t
                              #endif /* __cplusplus */
                          #elif defined(ANDROID) || defined(__ANDROID__)
                              #define MEDIAINFODLL_NAME "libmediainfo.so"
                              #define __stdcall
                          #else
                              #define MEDIAINFODLL_NAME "libmediainfo.so.0"
                              #define __stdcall
                          #endif //!defined(_WIN32) || defined(WIN32)
                          

                          Here I added the lines regarding Android. Unfortunately it didn't help. During program execution I get this error:

                          D/dalvikvm( 3296): Trying to load lib /data/app-lib/org.qtproject.muzika-2/libmediainfo.so 0xb3d087b0
                          E/linker ( 3296): "libmediainfo.so": ignoring 2-entry DT_PREINIT_ARRAY in shared library!
                          D/dalvikvm( 3296): Added shared lib /data/app-lib/org.qtproject.muzika-2/libmediainfo.so 0xb3d087b0
                          D/dalvikvm( 3296): No JNI_OnLoad found in /data/app-lib/org.qtproject.muzika-2/libmediainfo.so 0xb3d087b0, skipping init

                          It seems the program can find the library. But when I actually try to use it, I get this error:
                          D/libMuzika.so( 3296): (null):0 ((null)): "Unable to load libmediainfo.so"

                          In the header file (MediaInfoDLL.h) the library is then loaded with this command(s):

                                  if (!MediaInfo_Module)
                                      MediaInfo_Module = dlopen(MEDIAINFODLL_NAME, RTLD_LAZY);
                                  if (!MediaInfo_Module)
                                      MediaInfo_Module = dlopen("./" MEDIAINFODLL_NAME, RTLD_LAZY);
                          
                          

                          Do you have any idea what the problem could be now?

                          raven-worxR Offline
                          raven-worxR Offline
                          raven-worx
                          Moderators
                          wrote on last edited by
                          #12

                          @vlada
                          seems like Android has issues loading versioned libs.

                          --- SUPPORT REQUESTS VIA CHAT WILL BE IGNORED ---
                          If you have a question please use the forum so others can benefit from the solution in the future

                          1 Reply Last reply
                          0
                          • V Offline
                            V Offline
                            vlada
                            wrote on last edited by vlada
                            #13

                            Yes, I know about the problem with versioned libraries in Android. I spend many days before I made TagLib working in my application because of this. But in this case the problem is elsewhere.

                            I did some more tests and debugging with my limited skills and found out that the library is in fact loaded. The command

                            MediaInfo_Module = dlopen(MEDIAINFODLL_NAME, RTLD_LAZY);
                            

                            returns a valid handle. But next in the header file are assigned functions of the library and this is where it fails. The code looks like this:

                            MediaInfo_Inform=(MEDIAINFO_Inform)dlsym(MediaInfo_Module, "MediaInfoA_Inform");
                            

                            If I call

                            qDebug() << dlerror();
                            

                            I get following error: "undefined symbol: MediaInfo_Inform". What should I try to find out what is the problem? Is it possible to find out what functions does the library provide? Thank you.

                            jsulmJ 1 Reply Last reply
                            0
                            • V vlada

                              Yes, I know about the problem with versioned libraries in Android. I spend many days before I made TagLib working in my application because of this. But in this case the problem is elsewhere.

                              I did some more tests and debugging with my limited skills and found out that the library is in fact loaded. The command

                              MediaInfo_Module = dlopen(MEDIAINFODLL_NAME, RTLD_LAZY);
                              

                              returns a valid handle. But next in the header file are assigned functions of the library and this is where it fails. The code looks like this:

                              MediaInfo_Inform=(MEDIAINFO_Inform)dlsym(MediaInfo_Module, "MediaInfoA_Inform");
                              

                              If I call

                              qDebug() << dlerror();
                              

                              I get following error: "undefined symbol: MediaInfo_Inform". What should I try to find out what is the problem? Is it possible to find out what functions does the library provide? Thank you.

                              jsulmJ Offline
                              jsulmJ Offline
                              jsulm
                              Lifetime Qt Champion
                              wrote on last edited by
                              #14

                              @vlada You can use nm tool to list all symbols:

                              nm MY_LIB.so
                              

                              https://forum.qt.io/topic/113070/qt-code-of-conduct

                              1 Reply Last reply
                              0
                              • V Offline
                                V Offline
                                vlada
                                wrote on last edited by
                                #15

                                Thank you for the tip. So it seems it is not the correct library. This is the output I got from objdump (I found it when trying to find how to use nm):

                                DYNAMIC SYMBOL TABLE:
                                00000000      DF *UND*  00000000 __libc_init
                                00000000      DF *UND*  00000000 __cxa_atexit
                                00000000      DF *UND*  00000000 strcmp
                                00000000      DF *UND*  00000000 __errno
                                00000000      DF *UND*  00000000 lstat
                                00000000      DF *UND*  00000000 __stack_chk_fail
                                00000000      DO *UND*  00000000 __stack_chk_guard
                                00000000      DF *UND*  00000000 stat
                                00000000      DF *UND*  00000000 realloc
                                00000000      DF *UND*  00000000 malloc
                                00000000      DF *UND*  00000000 free
                                00000000      DF *UND*  00000000 strcpy
                                00000000      DF *UND*  00000000 opendir
                                00000000      DF *UND*  00000000 mbrtowc
                                00000000      DF *UND*  00000000 closedir
                                00000000      DF *UND*  00000000 readdir
                                00000000      DF *UND*  00000000 issetugid
                                00000000      DF *UND*  00000000 getlogin
                                00000000      DF *UND*  00000000 getenv
                                00000000      DF *UND*  00000000 getpwnam
                                00000000      DF *UND*  00000000 getuid
                                00000000      DF *UND*  00000000 getpwuid
                                00000000      DF *UND*  00000000 qsort
                                001deba9 g    DF .text  00000068 operator new(unsigned int)
                                00000000      DF *UND*  00000000 pthread_mutex_init
                                00000000      DF *UND*  00000000 pthread_mutex_destroy
                                001deffd g    DF .text  00000008 operator delete(void*)
                                00000000      DF *UND*  00000000 pthread_mutex_lock
                                00000000      DF *UND*  00000000 pthread_mutex_unlock
                                00000000      DF *UND*  00000000 mkdir
                                00000000      DF *UND*  00000000 truncate
                                00000000      DF *UND*  00000000 unlink
                                00000000      DF *UND*  00000000 rename
                                00000000      DF *UND*  00000000 wmemcmp
                                00000000      DF *UND*  00000000 memset
                                00000000      DF *UND*  00000000 fmodf
                                00000000      DF *UND*  00000000 fmod
                                00000000      DF *UND*  00000000 strlen
                                00000000      DF *UND*  00000000 pthread_attr_init
                                00000000      DF *UND*  00000000 pthread_attr_setdetachstate
                                00000000      DF *UND*  00000000 pthread_create
                                00000000      DF *UND*  00000000 sched_yield
                                000162a5  w   DF .text  00000018 tolower
                                00000000      DO *UND*  00000000 _tolower_tab_
                                000162bd  w   DF .text  00000018 toupper
                                00000000      DO *UND*  00000000 _toupper_tab_
                                001df1f5 g    DF .text  00000014 operator new[](unsigned int)
                                001dee45 g    DF .text  00000004 operator delete[](void*)
                                00000000      DF *UND*  00000000 wcslen
                                00000000      DF *UND*  00000000 wcsncpy
                                00000000      DF *UND*  00000000 strncpy
                                00000000      DF *UND*  00000000 memcpy
                                00000000      DF *UND*  00000000 gmtime
                                00000000      DF *UND*  00000000 localtime
                                001de4a9 g    DF .text  00000004 operator delete(void*, std::nothrow_t const&)
                                002f3fc0 g    DO .rodata        00000001 std::nothrow
                                001df449 g    DF .text  00000050 operator new(unsigned int, std::nothrow_t const
                                &)
                                00000000      DF *UND*  00000000 strftime
                                00000000      DF *UND*  00000000 time
                                00000000      DF *UND*  00000000 memmove
                                00000000      DF *UND*  00000000 pow
                                00000000      DF *UND*  00000000 powf
                                00000000      DF *UND*  00000000 ceil
                                001df3f5 g    DF .text  00000018 __cxa_pure_virtual
                                001de38d g    DF .text  0000009a __cxa_guard_acquire
                                001de469 g    DF .text  0000003e __cxa_guard_release
                                001de429 g    DF .text  00000040 __cxa_guard_abort
                                00000000      DF *UND*  00000000 logf
                                00000000      DF *UND*  00000000 log
                                00000000      DF *UND*  00000000 log10
                                00000000      DF *UND*  00000000 log10f
                                00000000      DF *UND*  00000000 floorf
                                00000000      DF *UND*  00000000 memcmp
                                00000000      DF *UND*  00000000 strtod
                                00000000      DF *UND*  00000000 strchr
                                00000000      DF *UND*  00000000 atoi
                                00000000      DF *UND*  00000000 uncompress
                                00000000      DF *UND*  00000000 compress2
                                00000000      DF *UND*  00000000 atan2f
                                00000000      DF *UND*  00000000 ceilf
                                00000000      DF *UND*  00000000 setlocale
                                001d5d0d  w   DF .text  00000024 isspace
                                00000000      DO *UND*  00000000 _ctype_
                                00000000      DF *UND*  00000000 strncmp
                                00000000      DF *UND*  00000000 snprintf
                                00000000      DF *UND*  00000000 sscanf
                                00000000      DF *UND*  00000000 fseek
                                00000000      DF *UND*  00000000 fgetc
                                00000000      DF *UND*  00000000 ferror
                                00000000      DF *UND*  00000000 ftell
                                00000000      DF *UND*  00000000 fread
                                00000000      DF *UND*  00000000 fopen
                                00000000      DF *UND*  00000000 fclose
                                00000000      DF *UND*  00000000 printf
                                00000000      DO *UND*  00000000 __sF
                                00000000      DF *UND*  00000000 vfprintf
                                00000000      DF *UND*  00000000 vsnprintf
                                00000000      DF *UND*  00000000 __android_log_print
                                00000000      DF *UND*  00000000 syscall
                                00000000      DF *UND*  00000000 abort
                                00000000      DF *UND*  00000000 pthread_key_delete
                                00000000      DF *UND*  00000000 pthread_getspecific
                                00000000      DF *UND*  00000000 pthread_setspecific
                                00000000      DF *UND*  00000000 pthread_key_create
                                00000000      DF *UND*  00000000 write
                                00000000      DF *UND*  00000000 acos
                                00000000      DF *UND*  00000000 asin
                                00000000      DF *UND*  00000000 atan
                                00000000      DF *UND*  00000000 atan2
                                00000000      DF *UND*  00000000 cos
                                00000000      DF *UND*  00000000 cosh
                                00000000      DF *UND*  00000000 exp
                                00000000      DF *UND*  00000000 frexp
                                00000000      DF *UND*  00000000 sqrt
                                00000000      DF *UND*  00000000 modf
                                00000000      DF *UND*  00000000 sin
                                00000000      DF *UND*  00000000 sinh
                                00000000      DF *UND*  00000000 tan
                                00000000      DF *UND*  00000000 tanh
                                00000000      DF *UND*  00000000 wmemcpy
                                00000000      DF *UND*  00000000 vsprintf
                                00000000      DF *UND*  00000000 memchr
                                00000000      DF *UND*  00000000 wcsftime
                                00000000      DF *UND*  00000000 pthread_once
                                00000000      DF *UND*  00000000 fflush
                                00000000      DF *UND*  00000000 fdopen
                                00000000      DF *UND*  00000000 setvbuf
                                00000000      DF *UND*  00000000 read
                                00000000      DF *UND*  00000000 writev
                                00000000      DF *UND*  00000000 lseek
                                00000000      DF *UND*  00000000 ioctl
                                00000000      DF *UND*  00000000 poll
                                00000000      DF *UND*  00000000 fstat
                                00000000      DF *UND*  00000000 wmemchr
                                00000000      DF *UND*  00000000 strcoll
                                00000000      DF *UND*  00000000 strxfrm
                                00000000      DF *UND*  00000000 wcscoll
                                00000000      DF *UND*  00000000 wcsxfrm
                                00000000      DF *UND*  00000000 fwrite
                                00000000      DF *UND*  00000000 getwc
                                00000000      DF *UND*  00000000 putwc
                                00000000      DF *UND*  00000000 getc
                                00000000      DF *UND*  00000000 ungetc
                                00000000      DF *UND*  00000000 ungetwc
                                00000000      DF *UND*  00000000 putc
                                00000000      DF *UND*  00000000 wmemset
                                00000000      DF *UND*  00000000 wmemmove
                                00000000      DF *UND*  00000000 wctype
                                00000000      DF *UND*  00000000 towupper
                                00000000      DF *UND*  00000000 towlower
                                00000000      DF *UND*  00000000 iswctype
                                00000000      DF *UND*  00000000 wctob
                                00000000      DF *UND*  00000000 btowc
                                00000000      DF *UND*  00000000 pthread_cond_destroy
                                00000000      DF *UND*  00000000 pthread_cond_wait
                                00000000      DF *UND*  00000000 pthread_cond_signal
                                00000000      DF *UND*  00000000 pthread_cond_broadcast
                                00000000      DF *UND*  00000000 strerror
                                00000000      DF *UND*  00000000 fputs
                                00000000      DF *UND*  00000000 fputc
                                00000000      DF *UND*  00000000 sprintf
                                00304458 g    D  *ABS*  00000000 _edata
                                00304458 g    D  *ABS*  00000000 __bss_start
                                0030a329 g    D  *ABS*  00000000 _end
                                00000000  w   DF *UND*  00000000 __gnu_Unwind_Find_exidx
                                00000000      DF *UND*  00000000 raise
                                

                                It is clear the functions I'm trying to use are simply not there. So I have probably no other option then to compile the library myself.

                                jsulmJ 1 Reply Last reply
                                0
                                • V vlada

                                  Thank you for the tip. So it seems it is not the correct library. This is the output I got from objdump (I found it when trying to find how to use nm):

                                  DYNAMIC SYMBOL TABLE:
                                  00000000      DF *UND*  00000000 __libc_init
                                  00000000      DF *UND*  00000000 __cxa_atexit
                                  00000000      DF *UND*  00000000 strcmp
                                  00000000      DF *UND*  00000000 __errno
                                  00000000      DF *UND*  00000000 lstat
                                  00000000      DF *UND*  00000000 __stack_chk_fail
                                  00000000      DO *UND*  00000000 __stack_chk_guard
                                  00000000      DF *UND*  00000000 stat
                                  00000000      DF *UND*  00000000 realloc
                                  00000000      DF *UND*  00000000 malloc
                                  00000000      DF *UND*  00000000 free
                                  00000000      DF *UND*  00000000 strcpy
                                  00000000      DF *UND*  00000000 opendir
                                  00000000      DF *UND*  00000000 mbrtowc
                                  00000000      DF *UND*  00000000 closedir
                                  00000000      DF *UND*  00000000 readdir
                                  00000000      DF *UND*  00000000 issetugid
                                  00000000      DF *UND*  00000000 getlogin
                                  00000000      DF *UND*  00000000 getenv
                                  00000000      DF *UND*  00000000 getpwnam
                                  00000000      DF *UND*  00000000 getuid
                                  00000000      DF *UND*  00000000 getpwuid
                                  00000000      DF *UND*  00000000 qsort
                                  001deba9 g    DF .text  00000068 operator new(unsigned int)
                                  00000000      DF *UND*  00000000 pthread_mutex_init
                                  00000000      DF *UND*  00000000 pthread_mutex_destroy
                                  001deffd g    DF .text  00000008 operator delete(void*)
                                  00000000      DF *UND*  00000000 pthread_mutex_lock
                                  00000000      DF *UND*  00000000 pthread_mutex_unlock
                                  00000000      DF *UND*  00000000 mkdir
                                  00000000      DF *UND*  00000000 truncate
                                  00000000      DF *UND*  00000000 unlink
                                  00000000      DF *UND*  00000000 rename
                                  00000000      DF *UND*  00000000 wmemcmp
                                  00000000      DF *UND*  00000000 memset
                                  00000000      DF *UND*  00000000 fmodf
                                  00000000      DF *UND*  00000000 fmod
                                  00000000      DF *UND*  00000000 strlen
                                  00000000      DF *UND*  00000000 pthread_attr_init
                                  00000000      DF *UND*  00000000 pthread_attr_setdetachstate
                                  00000000      DF *UND*  00000000 pthread_create
                                  00000000      DF *UND*  00000000 sched_yield
                                  000162a5  w   DF .text  00000018 tolower
                                  00000000      DO *UND*  00000000 _tolower_tab_
                                  000162bd  w   DF .text  00000018 toupper
                                  00000000      DO *UND*  00000000 _toupper_tab_
                                  001df1f5 g    DF .text  00000014 operator new[](unsigned int)
                                  001dee45 g    DF .text  00000004 operator delete[](void*)
                                  00000000      DF *UND*  00000000 wcslen
                                  00000000      DF *UND*  00000000 wcsncpy
                                  00000000      DF *UND*  00000000 strncpy
                                  00000000      DF *UND*  00000000 memcpy
                                  00000000      DF *UND*  00000000 gmtime
                                  00000000      DF *UND*  00000000 localtime
                                  001de4a9 g    DF .text  00000004 operator delete(void*, std::nothrow_t const&)
                                  002f3fc0 g    DO .rodata        00000001 std::nothrow
                                  001df449 g    DF .text  00000050 operator new(unsigned int, std::nothrow_t const
                                  &)
                                  00000000      DF *UND*  00000000 strftime
                                  00000000      DF *UND*  00000000 time
                                  00000000      DF *UND*  00000000 memmove
                                  00000000      DF *UND*  00000000 pow
                                  00000000      DF *UND*  00000000 powf
                                  00000000      DF *UND*  00000000 ceil
                                  001df3f5 g    DF .text  00000018 __cxa_pure_virtual
                                  001de38d g    DF .text  0000009a __cxa_guard_acquire
                                  001de469 g    DF .text  0000003e __cxa_guard_release
                                  001de429 g    DF .text  00000040 __cxa_guard_abort
                                  00000000      DF *UND*  00000000 logf
                                  00000000      DF *UND*  00000000 log
                                  00000000      DF *UND*  00000000 log10
                                  00000000      DF *UND*  00000000 log10f
                                  00000000      DF *UND*  00000000 floorf
                                  00000000      DF *UND*  00000000 memcmp
                                  00000000      DF *UND*  00000000 strtod
                                  00000000      DF *UND*  00000000 strchr
                                  00000000      DF *UND*  00000000 atoi
                                  00000000      DF *UND*  00000000 uncompress
                                  00000000      DF *UND*  00000000 compress2
                                  00000000      DF *UND*  00000000 atan2f
                                  00000000      DF *UND*  00000000 ceilf
                                  00000000      DF *UND*  00000000 setlocale
                                  001d5d0d  w   DF .text  00000024 isspace
                                  00000000      DO *UND*  00000000 _ctype_
                                  00000000      DF *UND*  00000000 strncmp
                                  00000000      DF *UND*  00000000 snprintf
                                  00000000      DF *UND*  00000000 sscanf
                                  00000000      DF *UND*  00000000 fseek
                                  00000000      DF *UND*  00000000 fgetc
                                  00000000      DF *UND*  00000000 ferror
                                  00000000      DF *UND*  00000000 ftell
                                  00000000      DF *UND*  00000000 fread
                                  00000000      DF *UND*  00000000 fopen
                                  00000000      DF *UND*  00000000 fclose
                                  00000000      DF *UND*  00000000 printf
                                  00000000      DO *UND*  00000000 __sF
                                  00000000      DF *UND*  00000000 vfprintf
                                  00000000      DF *UND*  00000000 vsnprintf
                                  00000000      DF *UND*  00000000 __android_log_print
                                  00000000      DF *UND*  00000000 syscall
                                  00000000      DF *UND*  00000000 abort
                                  00000000      DF *UND*  00000000 pthread_key_delete
                                  00000000      DF *UND*  00000000 pthread_getspecific
                                  00000000      DF *UND*  00000000 pthread_setspecific
                                  00000000      DF *UND*  00000000 pthread_key_create
                                  00000000      DF *UND*  00000000 write
                                  00000000      DF *UND*  00000000 acos
                                  00000000      DF *UND*  00000000 asin
                                  00000000      DF *UND*  00000000 atan
                                  00000000      DF *UND*  00000000 atan2
                                  00000000      DF *UND*  00000000 cos
                                  00000000      DF *UND*  00000000 cosh
                                  00000000      DF *UND*  00000000 exp
                                  00000000      DF *UND*  00000000 frexp
                                  00000000      DF *UND*  00000000 sqrt
                                  00000000      DF *UND*  00000000 modf
                                  00000000      DF *UND*  00000000 sin
                                  00000000      DF *UND*  00000000 sinh
                                  00000000      DF *UND*  00000000 tan
                                  00000000      DF *UND*  00000000 tanh
                                  00000000      DF *UND*  00000000 wmemcpy
                                  00000000      DF *UND*  00000000 vsprintf
                                  00000000      DF *UND*  00000000 memchr
                                  00000000      DF *UND*  00000000 wcsftime
                                  00000000      DF *UND*  00000000 pthread_once
                                  00000000      DF *UND*  00000000 fflush
                                  00000000      DF *UND*  00000000 fdopen
                                  00000000      DF *UND*  00000000 setvbuf
                                  00000000      DF *UND*  00000000 read
                                  00000000      DF *UND*  00000000 writev
                                  00000000      DF *UND*  00000000 lseek
                                  00000000      DF *UND*  00000000 ioctl
                                  00000000      DF *UND*  00000000 poll
                                  00000000      DF *UND*  00000000 fstat
                                  00000000      DF *UND*  00000000 wmemchr
                                  00000000      DF *UND*  00000000 strcoll
                                  00000000      DF *UND*  00000000 strxfrm
                                  00000000      DF *UND*  00000000 wcscoll
                                  00000000      DF *UND*  00000000 wcsxfrm
                                  00000000      DF *UND*  00000000 fwrite
                                  00000000      DF *UND*  00000000 getwc
                                  00000000      DF *UND*  00000000 putwc
                                  00000000      DF *UND*  00000000 getc
                                  00000000      DF *UND*  00000000 ungetc
                                  00000000      DF *UND*  00000000 ungetwc
                                  00000000      DF *UND*  00000000 putc
                                  00000000      DF *UND*  00000000 wmemset
                                  00000000      DF *UND*  00000000 wmemmove
                                  00000000      DF *UND*  00000000 wctype
                                  00000000      DF *UND*  00000000 towupper
                                  00000000      DF *UND*  00000000 towlower
                                  00000000      DF *UND*  00000000 iswctype
                                  00000000      DF *UND*  00000000 wctob
                                  00000000      DF *UND*  00000000 btowc
                                  00000000      DF *UND*  00000000 pthread_cond_destroy
                                  00000000      DF *UND*  00000000 pthread_cond_wait
                                  00000000      DF *UND*  00000000 pthread_cond_signal
                                  00000000      DF *UND*  00000000 pthread_cond_broadcast
                                  00000000      DF *UND*  00000000 strerror
                                  00000000      DF *UND*  00000000 fputs
                                  00000000      DF *UND*  00000000 fputc
                                  00000000      DF *UND*  00000000 sprintf
                                  00304458 g    D  *ABS*  00000000 _edata
                                  00304458 g    D  *ABS*  00000000 __bss_start
                                  0030a329 g    D  *ABS*  00000000 _end
                                  00000000  w   DF *UND*  00000000 __gnu_Unwind_Find_exidx
                                  00000000      DF *UND*  00000000 raise
                                  

                                  It is clear the functions I'm trying to use are simply not there. So I have probably no other option then to compile the library myself.

                                  jsulmJ Offline
                                  jsulmJ Offline
                                  jsulm
                                  Lifetime Qt Champion
                                  wrote on last edited by
                                  #16

                                  @vlada Are you sure you called objdump on that library? That list looks like a dump from a C standard library.

                                  https://forum.qt.io/topic/113070/qt-code-of-conduct

                                  1 Reply Last reply
                                  0
                                  • V Offline
                                    V Offline
                                    vlada
                                    wrote on last edited by
                                    #17

                                    Yes, I'm pretty sure I called it on the correct library. Or at least I thought it is the correct library. I found it here.

                                    I hope I will have some time over the weekend to try to compile it myself.

                                    1 Reply Last reply
                                    0

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