Michael Mohr wrote: > On Wed, 24 May 2006 10:26:05 -0700 > David Daney <ddaney@xxxxxxxxxx> wrote: > > >>Michael Mohr wrote: >> >>>Hello, >>> >>>I'm currently attempting to use GCC 4.1's gcj to compile a medium-sized (6000-line) java application. Unfortunately, it requires raw access to serial ports, as implemented by RXTX. It appears that RXTX has already been modified to compile using CNI; however, the port appears to be in early alpha stage. >>> >>>I am able to compile RXTX (mostly) without complaint. I am also able to compile my application -- GPSExplorer -- with no warnings or errors using GCC 4.1. However, it exits when run with the following exception: >>> >>>Exception in thread "main" java.lang.UnsupportedOperationException >>> at gnu.java.awt.peer.gtk.GdkGraphicsEnvironment.getAllFonts (lib-gnu-java-awt-peer-gtk.so) >>> at GPSExplorer.<init> (GPSExplorer) >>> at GPSExplorer.main (GPSExplorer) >>> >> >>Looks like GraphicsEnvironment.getAllFonts() is not supported by your >>libgcj. > > > Okay. Is there a person who I could contact that is working on related classes? I'd be happy to lend a hand, at least in regards to implementing functions missing from my own application. > The classpath project is the source of the culpable code. See http://www.gnu.org/software/classpath/ > >>>The program makes use of the AWT and Swing classes. It runs perfectly under any JVM after 1.2 (and probably before, but I haven't tested that far back). I compile and link GPSExplorer as follows: >>> >>>rm -f *.o *.s GPSExplorer >>> >>>for x in *.java >>>do >>> gcj -classpath .:$PWD/RXTX/RXTX.jar -c $x >>>done >>> >>>gcj *.o -L$PWD/RXTX -lrxtx -o GPSExplorer --main=GPSExplorer >>> >>>As I see it, there are 3 possibilities: >>> o Something is wrong with the app in question, GPSExplorer >> >>Perhaps. >> >> >>> o Something went wrong with the CNI RXTX port >> >>Again, perhaps, but that is not the problem you are seeing. >> >> >>> o Something isn't right with GCJ >>> >> >>Yeah. The AWT support is not complete yet. > > > I figured that, but I didn't want to seem pretentious by stating that there was a problem with GCJ. There may still be problems with GPSExplorer under GCJ, but as of yet this is the most visible issue. Incidentally, why was I able to compile and link GPSExplorer if a used function was not available? Many methods are stubbed out so that you don't get compile time errors. That this is a good thing is up for debate. > > >> >>>The text of the error leads me to Door #3, but I could be very wrong. This is my first attempt to compile a large Java application using GCJ. >>> >>>Here's the output of gcc -v: >>>Using built-in specs. >>>Target: i686-pc-linux-gnu >>>Configured with: /var/tmp/portage/gcc-4.1.0-r1/work/gcc-4.1.0/configure --prefix=/usr --bindir=/usr/i686-pc-linux-gnu/gcc-bin/4.1.0 --includedir=/usr/lib/gcc/i686-pc-linux-gnu/4.1.0/include --datadir=/usr/share/gcc-data/i686-pc-linux-gnu/4.1.0 --mandir=/usr/share/gcc-data/i686-pc-linux-gnu/4.1.0/man --infodir=/usr/share/gcc-data/i686-pc-linux-gnu/4.1.0/info --with-gxx-include-dir=/usr/lib/gcc/i686-pc-linux-gnu/4.1.0/include/g++-v4 --host=i686-pc-linux-gnu --build=i686-pc-linux-gnu --disable-altivec --enable-nls --without-included-gettext --with-system-zlib --disable-checking --disable-werror --disable-libunwind-exceptions --disable-multilib --disable-libmudflap --disable-libssp --enable-java-awt=gtk --enable-languages=c,c++,java,fortran --enable-shared --enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu >>>Thread model: posix >>>gcc version 4.1.0 (Gentoo 4.1.0-r1) >>> >>>When I enable -Wall, I get hundreds of warnings, all of which are either: >>> o warning: Discouraged redundant use of 'public' modifier in declaration of abstract method >>> o warning: An empty declaration is a deprecated feature that should not be used. >>> >>>Other than those two errors, nothing is reported. This is the contents of GPSExplorermain.i after the final link with -save-temps: >>> >> >>Then don't enable -Wall. > > > I'm perfectly aware that I can choose not to enable -Wall. I was following precisely the directions given for filing a bug report, which state at http://gcc.gnu.org/bugs.html : > > "Before reporting that GCC compiles your code incorrectly, please compile it with gcc -Wall and see whether this shows anything wrong with your code that could be the cause instead of a bug in GCC." > > I wanted it to be clear that I had read the directions and was following procedure. > Right, good point. David Daney
