crosscompile for android
lazarus / 43-Android

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herux · 2011-03-28 05:01

Hi all,
please help me with the following error,
I try to arm crosscompile for android OS. only a HelloWorld project
that uses dynlibs.pas unit.


/helloworld$ ppcarm -Tlinux -O- -XP -Xd
-Fu/usr/share/fpcsrc/rtl/units/arm-linux/
-FD/usr/share/fpcsrc/binutils/  helloworld.lpr
Free Pascal Compiler version 2.5.1 [2011/03/24] for arm
Copyright (c) 1993-2010 by Florian Klaempfl
Target OS: Linux for ARMEL
Compiling helloworld.lpr
Assembling helloworld
Compiling resource helloworld.or
Linking helloworld
/usr/share/fpcsrc/rtl/units/arm-linux/cprt0.o: In function `_start':
(.text+0x4c): undefined reference to `__libc_start_main'
/usr/share/fpcsrc/rtl/units/arm-linux/cprt0.o: In function
`_haltproc_eabi':
(.text+0x88): undefined reference to `_fini'
/usr/share/fpcsrc/rtl/units/arm-linux/cprt0.o: In function
`_haltproc_eabi':
(.text+0x90): undefined reference to `_init'
/usr/share/fpcsrc/rtl/units/arm-linux/dl.o: In function `DL_init':
/usr/share/fpcsrc/rtl/linux/../unix/dl.pp:100: undefined reference to
`dladdr'
helloworld.lpr(80) Error: Error while linking
helloworld.lpr(80) Fatal: There were 1 errors compiling module,
stopping
Fatal: Compilation aborted
I use a cross library of android NDK

thanks

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felipemdc · 2011-03-28 09:48

How have you installed FPC? Which instructions have you followed to do
that?

What is the source code of your test program?

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herux · 2011-03-28 10:47

Thanks for the replay

I follows this http://wiki.lazarus.freepascal.org/Cross_compiling
or this http://alexmogurenko.com/blog/programming/android-building-
free-pascal-compiler-for-android/
both links produce the same error
here is my helloworld code that work:
Code: [Select]program helloworld;
begin
  writeln('Hello android from freepascal');
end.

and here is the code that error on compile,
Code: [Select]program helloworld;
uses dynlibs;
begin
  writeln('Hello android from freepascal');
end.


I found this link http://honeypod.blogspot.com/2007/12/initialize-
libc-for-android.html
but I don't understand yet, can someone explain it ?

EDIT:
Sorry, I am using
- ubuntu 10.04 x86_64.
- fpc from svn
- build ppcrossarm using cross binary binutils source or this
http://www.codesourcery.com/

I have tried using the option -Xc to pass the linker and its compile
succesfully, but if running on emulator or real device, i got
"segmentation fault"

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felipemdc · 2011-03-28 11:40

Does it work if you use these instructions instead:

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

?

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herux · 2011-03-29 10:30

Hi @felipemdc
I have followed your instruction, but error still the same.
now I am using mandriva 2010 on virtualbox,

what should I do now?

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Laksen · 2011-03-29 11:18

Are you linking to the correct libraries, i.e have you copied the
libraries from the target phone?

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marcov · 2011-03-29 11:24

Does this target have glibc or some embedded libc ?

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herux · 2011-03-29 12:48

yes. I use the correct library. it's from android NDK (Native
Development Kit) http://developer.android.com/sdk/ndk/index.html

there are some libraries there, namely libc.so libdl.so, libz.so etc.