I managed to compile and run the library for android on emulator, which I compile the project just a libhellojni.so

compile using paramater like this

ppcarm -Scghi -O1 -Parm -gl -b -B -XX -Xc -XD -CpARMv6 -CfSOFT -dandroid -vewnhi -l -XParm-linux-
-Fi/home/herux/workspace/hellojni/jni/lib/arm-linux/ -Fu. -FUlib/arm-linux/ -o../libs/armeabi/libhellojni.so -FD/usr/share/fpcsrc/binutils/ hellojni.lpr

on Kubuntu 10.04 x86_64

library code:

library hellojni;
{$ ifdef fpc}
  {$ mode delphi}
{$ endif}
uses
     JNI, log;
Java_com_herux_hellojni_MainActivity_Hellojni function (env: PJNIEnv; Thiz:
jobject): jstring; cdecl;
begin
   result: = env ^. NewStringUTF (env, PChar ('Hello JNI from FreePascal
..'));
end;
exports
        Java_com_herux_hellojni_MainActivity_Hellojni name
'Java_com_herux_hellojni_MainActivity_Hellojni';
begin
end;

then I try to use classes unit or sysutils, the project succeeded in compiling, but the library did not loaded by the emulator. there is an error SIGSEGV

D/dalvikvm( 1082): Trying to load lib
/data/data/com.herux.hellojni/lib/libhellojni.so 0x44e7ea48 I/DEBUG ( 31): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
I/DEBUG ( 31): Build fingerprint:
'generic/sdk/generic/:2.2/FRF91/43546:eng/test-keys' I/DEBUG ( 31): pid: 1082, tid: 1082 >>> com.herux.hellojni <<< I/DEBUG ( 31): signal 11 (SIGSEGV), fault addr 7eb67b08 I/DEBUG ( 31): r0 7eb67b08 r1 7eb67b08 r2 00000000 r3 0000003d I/DEBUG ( 31): r4 00000006 r5 809aa4cc r6 b001037c r7 00000000 I/DEBUG ( 31): r8 80813b00 r9 0000ccb0 10 4186b904 fp beb1986c I/DEBUG ( 31): ip beb19870 sp beb19818 lr 809ab5d4 pc 809ab56c cpsr 60000010
I/DEBUG ( 31): #00 pc 000ab56c
/data/data/com.herux.hellojni/lib/libhellojni.so
I/DEBUG ( 31): #01 lr 809ab5d4
/data/data/com.herux.hellojni/lib/libhellojni.so
I/DEBUG ( 31):
I/DEBUG ( 31): code around pc:

if anyone has ever experienced it? or is it a bug?

thanks

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W dniu 2011-04-12 11:56, herux pisze:

How You prepare crosscompiler
did You use -dARMEL -CpARMv6

or problems with binutils

On Android each bug in linking is showing the same

Darek

I use this binutils http://www.gnu.org/software/binutils/ using this command to build crosscompiler

make clean crossinstall CPU_TARGET=arm OS_TARGET=linux CROSSBINDIR=/usr/share/fpcsrc/binutils/ OPT="-dFPC_ARMEL -O- -gl" CROSSOPT="-dANDROID -CpARMv6 -gl -CfSOFT -O-"

I may have to repeat it

thank u

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Have you done "Step 2" described here:

http://wiki.lazarus.freepascal.org/Android_Interface#Using_the_pre-compiled_compiler

?

I know that those instructions are different from what you are doing, but Step 2 should apply anyway.

CROSSOPT="-dANDROID -CpARMv6 -dFPC_ARMEL "

I've trace Your debug log. Bug is on line where library is loaded. It seems be corrupted. I always had once more line with absent of dlopen

D/dalvikvm( 1082): Trying to load lib
/data/data/com.herux.hellojni/lib/libhellojni.so 0x44e7ea48

here something with "dlopen", I don't remember exactly. ^^^^^^^^^^^
I/DEBUG ( 31): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***

Darek

Hi,

Fyi, there is an unresolved issue with Android shared library initialization code which affects the use of the sysutils unit, see http://bugs.freepascal.org/view.php?id=18833 for more details.

Thomas

My problem is resolved, I apply the patch contained in that link. reported by Dejan Boras.
then rebuild cross compiler with this:

make clean crossinstall CPU_TARGET=arm OS_TARGET=linux CROSSBINDIR="/usr/share/fpcsrc/binutils" OPT="-dFPC_ARMEL -O- -gl" CROSSOPT="-dANDROID -CpARMv5 -gl -CfSOFT -O-"

now it's work. libhellojni.so loaded succesfully.

thanks

herux

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