Re: gcj: error trying to exec 'ecj1': execvp

[Andrew Haley <aph at redhat dot com>]

David Michel wrote:
> Thanks it compiles fine now, but now I get an Exception at runtime:
> 
> Exception in thread "main" java.awt.AWTError: Cannot load AWT toolkit:
>    at java.awt.Toolkit.getDefaultToolkit(Toolkit.java:607)
>    at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:103)
>    at java.awt.Window.<init>(Window.java:133)
>    at java.awt.Frame.<init>(Frame.java:246)
>    at javax.swing.JFrame.<init>(JFrame.java:114)
>    at nl.kbna.dioscuri.GUI.<init>(dioscuri)
>    at nl.kbna.dioscuri.GUI.<init>(dioscuri)
>    at nl.kbna.dioscuri.GUI.main(dioscuri)
> Caused by: java.lang.ClassNotFoundException:
>    at java.lang.Class.forName(natClass.cc:101)
>    at java.awt.Toolkit.getDefaultToolkit(Toolkit.java:583)
>    ...7 more
> 
> I simply run this for all the java source code to produce the object files:
> /local/gcc-4_4-branch/install/bin/gcj -O0 -g0 -c "--classpath=./:"
> foo.java -o foo.o
> 
> and then, link them together with:
> /local/gcc-4_4-branch/install/bin/gcj -O0 -g0 --main=GUI foo1.o
> foo2.o..... -o ./a.out
> 
> Obviously, it seems that it cannot find AWT, but I don't know why and
> how to solve this.

http://gcc.gnu.org/install/configure.html

AWT-Specific Options

--with-x
    Use the X Window System.

--enable-java-awt=PEER(S)

    Specifies the AWT peer library or libraries to build alongside
    `libgcj'. If this option is unspecified or disabled, AWT will be
    non-functional. Current valid values are gtk and xlib. Multiple
    libraries should be separated by a comma
    (i.e. --enable-java-awt=gtk,xlib).

I'd use gtk.

Andrew.