Problem linking java program

[Michael Koch]

On Thu, Nov 10, 2005 at 02:06:34PM +0100, Julien Claassen wrote:
> Hello all!
>   I wanted to compile a helloworld program with selfcompiled gcc-3.4.3 (see
> below for more info). It had linking problems. Compile only works fine.
>   The program was:
> // Begin of Test.java
> 
> import java.lang.*;
> 
> class Test
> {
> 	public static void main(String args[])
> 	{
> 		System.out.println("Hello world.\n");
> 	}
> };
> 
> // EOF
>   The gcj call and output was:
> gcj Test.java
> 
> /usr/lib/crt1.o: In function `_start':
> /usr/lib/crt1.o(.text+0x18): undefined reference to `main'
> collect2: ld returned 1 exit status
>   I tried gcc, which gave some additional info:
> gcc Test.java

use this:

gcj --main=Test Test.java -o test

That is all well described in the gcj documentation.


Cheers,
Michael
> 
> /usr/lib/crt1.o: In function `_start':
> /usr/lib/crt1.o(.text+0x18): undefined reference to `main'
> /tmp/ccq72aMH.o: In function `Test::main(JArray<java::lang::String*>*)':
> /tmp/ccq72aMH.o(.text+0x8): undefined reference to `java::lang::System::class$'
> /tmp/ccq72aMH.o(.text+0x1b): undefined reference to `_Jv_InitClass'
> /tmp/ccq72aMH.o(.text+0x28): undefined reference to `java::lang::System::class$'
> /tmp/ccq72aMH.o(.text+0x2d): undefined reference to `_Jv_InitClass'
> /tmp/ccq72aMH.o(.text+0x37): undefined reference to `java::lang::System::out'
> /tmp/ccq72aMH.o: In function `Test::Test()':
> /tmp/ccq72aMH.o(.text+0x5f): undefined reference to `java::lang::Object::Object()'
> /tmp/ccq72aMH.o(.data+0x50): undefined reference to `java::lang::Object::finalize()'
> /tmp/ccq72aMH.o(.data+0x54): undefined reference to `java::lang::Object::hashCode()'
> /tmp/ccq72aMH.o(.data+0x58): undefined reference to `java::lang::Object::equals(java::lang::Object*)'
> /tmp/ccq72aMH.o(.data+0x5c): undefined reference to `java::lang::Object::toString()'
> /tmp/ccq72aMH.o(.data+0x60): undefined reference to `java::lang::Object::clone()'
> /tmp/ccq72aMH.o(.data+0xa0): undefined reference to `vtable for java::lang::Class'
> /tmp/ccq72aMH.o(.data+0xb4): undefined reference to `java::lang::Object::class$'
> /tmp/ccq72aMH.o(.eh_frame+0x11): undefined reference to `__gcj_personality_v0'
> collect2: ld returned 1 exit status
> My gcc was compiled with this config:
> gcc -v
> Reading specs from /usr/local/gcc343/lib/gcc/i686-pc-linux-gnu/3.4.3/specs
> Configured with: ../gcc-3.4.3/configure --prefix=/usr/local/gcc343 --enable-threads=posix --enable-__cxa_atexit --enable-version-specific-runtime-libs --enable-languages=c,c++,f77,objc,java --enable-gather-detailed-mem-stats --enable-nls --with-included-gettext --enable-interpreter --enable-libgcj-multifile --with-x --enable-java-awt=xlib
> Thread model: posix
> gcc version 3.4.3
>   I've got an i686 athlon (k7) machine with SuSE 8.1 glibc-2.2.5 (the crt1.o
> is in that package).
>   I looked into the crt1.o with nm, here's the small output:
> nm /usr/lib/crt1.o
> 
> 00000004 R _IO_stdin_used
> 00000000 D __data_start
>          U __libc_start_main
>          U _fini
> 00000000 R _fp_hw
>          U _init
> 00000000 T _start
> 00000000 W data_start
>          U main
>   Can anyone help me? Did I forget to install/update something? How about
> environment variables anything SPECIAL I need?
>   Kindest regards and thanks for any help
>             Julien
> 
> --------
> Music was my first love and it will be my last (John Miles)
> 
> ======== FIND MY WEB-PROJECT AT: ========
> http://ltsb.sourceforge.net - the Linux TextBased Studio guide
> 

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