[mythtv] Android 32bit build

[Peter Bennett]

On 08/08/2018 08:14 PM, Mark Spieth wrote:
> On 09/08/18 08:37, Peter Bennett wrote:
>> I am trying to build the libraries for 32bit.
>>
>> liblzo fails in the configure "C compiler cannot create executables"
>>
>> makelibs.sh has, for 32bit,     CPU="armv7-a"
>>
>> The configure runs this
>>
>> /home/peter/android/android-ndk/my-android-toolchain/bin/arm-linux-androideabi-gcc 
>> -isysroot 
>> /home/peter/android/android-ndk/my-android-toolchain/sysroot 
>> -mcpu=armv7-a   conftest.c
>>
>> The error is
>>
>> arm-linux-androideabi-gcc: error: unrecognized argument in option 
>> '-mcpu=armv7-a'
>> arm-linux-androideabi-gcc: note: valid arguments to '-mcpu=' are: 
>> arm1020e arm1020t arm1022e arm1026ej-s arm10e arm10tdmi arm1136j-s 
>> arm1136jf-s arm1156t2-s arm1156t2f-s arm1176jz-s arm1176jzf-s arm2 
>> arm250 arm3 arm6 arm60 arm600 arm610 arm620 arm7 arm70 arm700 arm700i 
>> arm710 arm7100 arm710c arm710t arm720 arm720t arm740t arm7500 
>> arm7500fe arm7d arm7di arm7dm arm7dmi arm7m arm7tdmi arm7tdmi-s arm8 
>> arm810 arm9 arm920 arm920t arm922t arm926ej-s arm940t arm946e-s 
>> arm966e-s arm968e-s arm9e arm9tdmi cortex-a12 cortex-a15 
>> cortex-a15.cortex-a7 cortex-a5 cortex-a53 cortex-a57 
>> cortex-a57.cortex-a53 cortex-a7 cortex-a8 cortex-a9 cortex-m0 
>> cortex-m0plus cortex-m1 cortex-m3 cortex-m4 cortex-r4 cortex-r4f 
>> cortex-r5 cortex-r7 ep9312 fa526 fa606te fa626 fa626te fa726te fmp626 
>> generic-armv7-a iwmmxt iwmmxt2 marvell-pj4 mpcore mpcorenovfp native 
>> strongarm strongarm110 strongarm1100 strongarm1110 xscale
>>
>> I tried changing CPU to use generic-armv7-a which is one of the 
>> "valid" arguments according to above message. That gives the same 
>> error, but this time not even displaying the list of "valid arguments".
>>
>> ndk is android-ndk-r13b
>>
>> Any suggestions?
>>
> try this.
>
> diff --git a/android/makelibs.sh b/android/makelibs.sh
> index 9d737b2..8c54895 100755
> --- a/android/makelibs.sh
> +++ b/android/makelibs.sh
> @@ -1179,17 +1179,15 @@ OPATH=$PATH
>  #              ;;
>  #      *)
>  #END
> +export PATH="$PATH:$CROSSPATH"
>  ./configure \
> -       CFLAGS="-isysroot $SYSROOT -mcpu=$CPU" \
> -       CXXFLAGS="-isysroot $SYSROOT -mcpu=$CPU" \
> -       CC="$CROSSPATH/$MY_ANDROID_NDK_TOOLS_PREFIX-gcc" \
> -       CXX="$CROSSPATH/$MY_ANDROID_NDK_TOOLS_PREFIX-g++" \
> -       CPP="$CROSSPATH/$MY_ANDROID_NDK_TOOLS_PREFIX-cpp" \
> -       --host=arm-linux-androideabi \
> +       --host=$MY_ANDROID_NDK_TOOLS_PREFIX \
>         --prefix=$INSTALLROOT \
>         --enable-shared \
>         --enable-static && \
>  make clean && \
> +CFLAGS="-isysroot $SYSROOT -mcpu=$CPU" \
> +CXXFLAGS="-isysroot $SYSROOT -mcpu=$CPU" \
>  make -j$NCPUS src/liblzo2.la && \
>  make install-libLTLIBRARIES install-data-am
>  ERR=$?
>
> builds for me both 32 and 64 but untested on targets.
>
> Mark
>
>
Thank you, it now builds and installs on my 32-bit tablet. However it 
does not run.

D/dalvikvm( 6836): Trying to load lib 
/data/data/org.mythtv.mythfrontend/lib/libQt5Core.so 0x4199b580
E/dalvikvm( 6836): 
dlopen("/data/data/org.mythtv.mythfrontend/lib/libQt5Core.so") failed: 
Cannot load library: soinfo_relocate(linker.cpp:976): cannot locate 
symbol "srand" referenced by "libQt5Core.so"...
W/System.err( 6836): java.lang.reflect.InvocationTargetException
...
W/System.err( 6836): Caused by: java.lang.UnsatisfiedLinkError: Cannot 
load library: soinfo_relocate(linker.cpp:976): cannot locate symbol 
"srand" referenced by "libQt5Core.so"...

Some internet links about this -

/For those stumbling onto this thread while having trouble with 
srand/atof on NDK r10c: Make sure you set your android target to 19. 
Your app should then work on Android 5 (21) as well as all lower versions.//
/
/if i use Android 19 to compile the codes that invoke srand(), because 
srand() is a static inline function, so it will invoke srand48 instead, 
which means cocos2d-x depends on srand48 instead of srand. srand48 is 
defined in all Android versions, so there is not problem.//
//i using Android 21+ to compiling the codes, srand() is defined like 
void srand(unsigned int);, so cocos2d-x depends on srand. Because srand 
is not defined below Android 21, so it will have problem if running on 
Android version below 21.//
/
My tablet has android 4.2.2, which should be ok with api version 21, I 
would think.

Peter
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