Re: compilation problems with ecj.jar

[Marco Trudel <mtrudel at gmx dot ch>]

Andrew Haley wrote:
> The *real* cause is that, for some reason, gcj isn't being passed the
> correct path to libgcj.jar in the host system.  Instead, this happens:
>
> jc1 /mnt/zebedee/aph/gcc/trunk/libjava/.././libjava/../ecj.jar \
>  -fhash-synchronization \
>  -fno-use-divide-subroutine \
>  -fuse-boehm-gc \
>  -fnon-call-exceptions \
>  -fkeep-inline-functions \
>  -quiet \
>  -dumpbase ecj.jar \
>  -mtune=generic \
>  -auxbase ecj \
>  -g \
>  -O2 \
>  -version \
>  -ffloat-store \
>  -fomit-frame-pointer \
>  -findirect-dispatch \
>  -fbootclasspath=./:/tmp/prefix/share/java/libgcj-4.3.0.jar \
>  -o /tmp/ccD80X4c.s
>
> Note that the bootclasspath at this point is wrong: there's no
> libgcj.jar in the install dir yet.  The first "./" item in the string
> is wrong because the .class files we need are no longer in the build
> dir: they're in the srcdir.
>
> This oughta do it:
>
> Index: Makefile.am
> ===================================================================
> --- Makefile.am	(revision 120638)
> +++ Makefile.am	(working copy)
> @@ -670,7 +670,7 @@
>  ecjx_LDFLAGS = $(ECJX_BASE_FLAGS) -Djava.class.path=$(ECJ_JAR)
>  else !ENABLE_SHARED
>  ## Use ecj.jar at compile time.
> -ecjx_LDFLAGS = $(ECJX_BASE_FLAGS) $(ECJ_BUILD_JAR)
> +ecjx_LDFLAGS = $(ECJX_BASE_FLAGS) $(ECJ_BUILD_JAR) -fbootclasspath=$(BOOTCLASSPATH)
>  endif !ENABLE_SHARED
>  
>  ecjx_LDADD = -L$(here)/.libs libgcj.la

No, still the same:
/home/Marco/Desktop/compile-lin-lin/gcc-build/gcc/gcj 
-B/home/Marco/Desktop/compile-lin-lin/gcc-build/i686-pc-linux-gnu/libjava/ 
-B/home/Marco/Desktop/compile-lin-lin/gcc-build/gcc/ -ffloat-store 
-fomit-frame-pointer -g -O2 -o ecjx -findirect-dispatch 
--main=org.eclipse.jdt.internal.compiler.batch.GCCMain 
/usr/local/src/gcc/libjava/.././libjava/../ecj.jar 
-L/home/Marco/Desktop/compile-lin-lin/gcc-build/i686-pc-linux-gnu/libjava 
-L/home/Marco/Desktop/compile-lin-lin/gcc-build/i686-pc-linux-gnu/libjava/.libs 
./.libs/libgcj.a 
-L/home/Marco/Desktop/compile-lin-lin/gcc-build/i686-pc-linux-gnu/libstdc++-v3/src 
-L/home/Marco/Desktop/compile-lin-lin/gcc-build/i686-pc-linux-gnu/libstdc++-v3/src/.libs 
-lpthread -lrt -ldl 
-L/home/Marco/Desktop/compile-lin-lin/gcc-build/./gcc 
-L/home/Marco/Desktop/compile-lin-lin/gcc-XYZXYZ-lin/i686-pc-linux-gnu/bin 
-L/home/Marco/Desktop/compile-lin-lin/gcc-XYZXYZ-lin/i686-pc-linux-gnu/lib 
-lgcc -lc -lgcc
gcj: Internal error: Segmentation fault (program jc1)
Please submit a full bug report.

Maybe I patched the wrong Makefile.am? I patched the one in the libjava 
dir...

Another question: I noticed that ecj.jar is compiled at the end. How can 
then gcj compile all java sources before that? Is ecj.jar called by gij? 
Just thought about it and I'm curious...


>  > BTW,l there are more problems with compiling ecj.jar for
>  > cross-compiling. Creating a host-linux, target-windows GCJ will
>  > create a ecj.exe what is definitely the wrong thing to do.
>
> It's the right thing to do.  You have to build the ecj.exe for
> GNU/Linux as a separate step when building the GNU/Linux native
> compiler.  If you don't want ecj.exe for the target, don't include
> ecj.jar in the build tree.

What do I need a "exe" for on Linux? If I create a gcj with host=Linux 
and target=Windows, I'd assume that I get a "ecj" binary for Linux that 
compiles for Windows. All other created binaries (gcc, gcj, objdump, 
...) are also for Linux and not exes. If I get a ecj.exe, what can I do 
with it? I wont be able to compile .java files on Linux and its useless 
on Windows as far as I can see. But I'd be glad to learn better...


thanks
Marco