ecj1 in cross-compile

[Daniel Andrzejewski]

Andrew Haley wrote:
> 
> Daniel Andrzejewski wrote:
>> 
>> 
>> Andrew Haley wrote:
>>> Daniel Andrzejewski wrote:
>>>>
>>>> David Daney wrote:
>>>>> Andrew Haley wrote:
>>>>>> Matthijs van de Water wrote:
>>>>>>
>>>>>>   
>>>>>>> I've got my GCC 4.3 toolchain working ok now, but for some reason I
>>>>>>> fail to get an ecj1 binary.
>>>>>>>
>>>>>>> I'm cross-compiling for ARM and I've tried --with-ecj-jar=XXX (which
>>>>>>> doesn't result in an ecj1) and also tried putting ecj.jar in my
>>>>>>> build
>>>>>>> dir (which complains about a missing java compiler).
>>>>>>> I must be doing something wrong, but I'm not sure what.
>>>>>>>
>>>>>>> I expect an i686 ecj1 binary to be compiled from the ecj-latest.jar
>>>>>>> that I download in my build. Preferably standalone, like the Ubuntu
>>>>>>> one.
>>>>>>> The build machine doesn't have an i686 GCJ or JAVAC installed, is
>>>>>>> that
>>>>>>> a problem?
>>>>>>>
>>>>>>> What am I missing?
>>>>>>>     
>>>>>> I don't know how you think this is going to work.  ecj1 is a Java
>>>>>> program
>>>>>> and thus it needs some sort of Java runtime library.  You are going
>>>>>> to
>>>>>> need
>>>>>> an i686 gcj installed.  
>>>>> That's right.  It is a new requirement for GCC-4.3 cross compilers.
>>>>> Either install a native build of gcj/libgcj in your PATH, or as Andrew
>>>>> suggested use the little shell script to invoke the jar file.
>>>>>
>>>>> You have to be careful though, if you may not always want a native
>>>>> GCC-4.3 in your PATH, perhaps only when invoking the cross compiler.
>>>>> You could just copy or link the native ecj1 to the cross compiler bin
>>>>> directory.
>>>>>
>>>>> David Daney
>>>>>
>>>>>
>>>>>
>>>> Hi,
>>>>
>>>> I have successfully compiled gcc-4.3.0. I need to cross-compile java
>>>> code
>>>> to
>>>> binary executables which wouldn't need shared libraries. So, I used
>>>> options
>>>> like 
>>>> --disable-shared
>>>> --enable-languages=java
>>>> --with-ecj-jar=/home/daniel/ecj.jar
>>>>
>>>> Now, when I try to compile a java program I get the following error:
>>>>
>>>> ~> gcj --main=HelloWorld -o HelloWorld HelloWorld.java
>>>>
>>>> Exception in thread "main" java.lang.NoClassDefFoundError:
>>>> org.eclipse.jdt.internal.compiler.batch.GCCMain
>>>>    at gnu.java.lang.MainThread.run(MainThread.java:102)
>>>> Caused by: java.lang.ClassNotFoundException:
>>>> org.eclipse.jdt.internal.compiler.batch.GCCMain not found in
>>>> gnu.gcj.runtime.SystemClassLoader{urls=[file:./],
>>>> parent=gnu.gcj.runtime.ExtensionClassLoader{urls=[], parent=null}}
>>>>    at java.net.URLClassLoader.findClass(URLClassLoader.java:529)
>>>>    at java.lang.ClassLoader.loadClass(ClassLoader.java:442)
>>>>    at java.lang.ClassLoader.loadClass(ClassLoader.java:377)
>>>>    at gnu.java.lang.MainThread.run(MainThread.java:98)
>>>>
>>>>
>>>> I cannot figure out what to fix. I tried to move the existing ecj1
>>>> file,
>>>> and
>>>> that's what I got:
>>>>
>>>> ~> gcj --main=HelloWorld -o HelloWorld HelloWorld.java
>>>>
>>>> gcj: error trying to exec 'ecj1': execvp: Permission denied
>>>>
>>>>
>>>> It's understandable, I just renamed the ecj1 to something else.
>>>>
>>>> Now, when I use a short bash script that is provided above, I get
>>>> different
>>>> error:
>>>>
>>>> ~> gcj --main=HelloWorld -o HelloWorld HelloWorld.java
>>>>
>>>> Exception in thread "main" java.lang.NoClassDefFoundError:
>>>> org.eclipse.jdt.internal.compiler.batch.GCCMain
>>>> *** Got java.lang.NullPointerException while trying to print stack
>>>> trace.
>>> My bash script is:
>>>
>>> #!/bin/sh
>>> gij -cp /home/aph/gcc/trunk/ecj.jar \
>>>     org.eclipse.jdt.internal.compiler.batch.GCCMain \
>>>     ${1+"$@"}
>>>
>>> Andrew.
>>>
>>>
>> 
>> So, I used your script, just made an adjustment to the path to ecj.jar
>> file,
>> and as I mentioned earlier, I got this error:
>> 
>> Exception in thread "main" java.lang.NoClassDefFoundError:
>> org.eclipse.jdt.internal.compiler.batch.GCCMain
>> *** Got java.lang.NullPointerException while trying to print stack trace. 
>> 
>> What should I fix? I seem to get stuck.
> 
> In your gcc 4.3 build directory, type:
> 
> make check-target-libjava
> 
> Andrew.
> 
> 

Hi Andrew,

Thank you for your reply. 

I'm going to try 'make check-target-libjava', but for now it looks like I
found the solution to my compilation problem:

export CLASSPATH=.:/home/scratch/daniel/:/sw/java-jdk/ecj.jar

~> /scratch/daniel> gcj --main=HelloWorld -o HelloWorld HelloWorld.java
~> /scratch/daniel> ./HelloWorld
Hello World!

Success! But ...

~> /scratch/daniel> file HelloWorld

HelloWorld: ELF 64-bit LSB executable, AMD x86-64, version 1 (SYSV), for
GNU/Linux 2.4.1, dynamically linked (uses shared libs), not stripped

~> /scratch/daniel> ldd HelloWorld
        libm.so.6 => /lib64/tls/libm.so.6 (0x00002b1b953be000)
        libpthread.so.0 => /lib64/tls/libpthread.so.0 (0x00002b1b95515000)
        librt.so.1 => /lib64/tls/librt.so.1 (0x00002b1b95629000)
        libz.so.1 => /lib64/libz.so.1 (0x00002b1b95732000)
        libdl.so.2 => /lib64/libdl.so.2 (0x00002b1b95845000)
        libc.so.6 => /lib64/tls/libc.so.6 (0x00002b1b95948000)
        /lib64/ld-linux-x86-64.so.2 => /lib64/ld-linux-x86-64.so.2
(0x00002b1b952a7000)


I really need to build gcc with static libraries, so my final result would
look like this:

daniel@acai ~/mpi> ldd hello
        not a dynamic executable

daniel@acai ~/mpi> file hello
hello: ELF 64-bit LSB executable, AMD x86-64, version 1 (SYSV), for
GNU/Linux 2.4.1, statically linked, for GNU/Linux 2.4.1, not stripped


What should I do? Do you have any suggestions? 

Regards,

Daniel Andrzejewski

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