gcj static crosscompiling raises issues with boehm-gc

Wed Oct 6 16:53:00 GMT 2010

Am Mittwoch, 6. Oktober 2010, um 08:51:40 schrieb David Daney:
> On 10/06/2010 07:25 AM, Andrew Haley wrote:
> > On 10/06/2010 09:43 AM, Andreas Frisch wrote:
> >> hi gcj experts,
> >> 
> >> i've spent some time already trying to statically cross compile a java
> >> source for an embedded mipsel architecture. i'm using openembedded
> >> and gcc-4.4.4 with the latest java part imported from master
> >> 
> >> in the makefile, i am using the command
> >> 
> >> $(CROSS_COMPILE)gcj $(JFLAGS) $(SOURCES) \
> >> 
> >> 		-static-libgcj \
> >> 		-fjni \
> >> 		-g \
> >> 		-o dumphd-mipsel-static \
> >> 		
> >> 		 --main=dumphd.core.DumpHD \
> >> 		
> >> 		-nostdlib \
> >> 		-L/dream/oe1.6/dm8000/build/tmp/staging/mipsel-oe-linux/usr/lib 
\
> >> 		-L/dream/projects/bluray/aacskeys-0.4.0c-mipsel/lib/linux/ \
> >> 		-Wl,-rpath-link,/dream/oe1.6/dm8000/build/tmp/staging/mipsel-oe-
> >> 
> >> linux/usr/lib \
> >> 
> >> 		-Wl,-rpath-link,/dream/projects/bluray/aacskeys-0.4.0c-
> >> 
> >> mipsel/lib/linux/ -laacskeys \
> >> 
> >> 		-shared-libgcc -Wl,-non_shared -lgcj -Wl,-call_shared -lstdc++ -
> >> 
> >> Wl,--as-needed -lgcc_s -lpthread -lc -lm -ldl -lrt -Wl,--no-as-needed
> >> -Wl,-O1
> >> 
> >> this may contain a lot of redundancies or look silly in many ways but
> >> for right now i just aggregated as much as possible in there from
> >> what i could find online.
> >> 
> >> i've also set
> >> CLASSPATH=/dream/oe1.6/dm8000/build/tmp/cross/mipsel/bin/ecj.jar:./
> >> 
> >> when i run make, linking fails:
> >> 
> >> /dream/oe1.6/dm8000/build/tmp/cross/mipsel/lib/gcc/mipsel-oe-
> >> linux/4.4.4/../../../../mipsel-oe-linux/bin/ld: warning: cannot find
> >> entry symbol __start; defaulting to 00000000004084b0
> >> /dream/oe1.6/dm8000/build/tmp/cross/mipsel/lib/gcc/mipsel-oe-
> >> linux/4.4.4/../../../../mipsel-oe-linux/lib/libgcj.a(dyn_load.o): In
> >> function `GC_register_dynamic_libraries_dl_iterate_phdr':
> >> /dream/oe1.6/dm8000/build/tmp/work/mipsel-oe-linux/gcc-cross-4.4.4-
> >> r0.1/gcc-4.4.4/boehm-gc/dyn_load.c:454: undefined reference to
> >> `__data_start'
> >> /dream/oe1.6/dm8000/build/tmp/cross/mipsel/lib/gcc/mipsel-oe-
> >> linux/4.4.4/../../../../mipsel-oe-linux/lib/libgcj.a(os_dep.o): In
> >> function `GC_register_data_segments':
> >> /dream/oe1.6/dm8000/build/tmp/work/mipsel-oe-linux/gcc-cross-4.4.4-
> >> r0.1/gcc-4.4.4/boehm-gc/os_dep.c:1450: undefined reference to
> >> `__data_start' collect2: ld returned 1 exit status
> >> make: *** [dumphd-static-new] Error 1
> >> 
> >> i'd be grateful for any suggestions or hints.
> > 
> > This looks completely broken: it seems to be trying to statically link
> > against libgcj. Try it without -non_shared.
>> To expound on this, the '-static-libgcj' option was created so that all
> the other things you have there would be unneeded.
>> I doubt you want any of: -shared-libgcc -Wl,-non_shared -lgcj
> -Wl,-call_shared -lstdc++ -Wl,--as-needed -lgcc_s -lpthread -lc -lm -ldl
> -lrt -Wl,--no-as-needed -Wl,-O1
>>> Start off with -static-libgcj on a very simple 'hello-world' type
> program. Then start adding all your other things in.
>> David Daney

hi david!
actually i was already successful statically cross compiling java programs as 
complex as projectx:
it works both the traditional way
projectx-static-oldfashioned: $(OBJS)
	$(CROSS_COMPILE)gcj $(JFLAGS) -c -o ac3.o --resource ac3.bin 
../resources/ac3.bin
	$(CROSS_COMPILE)gcj $(JFLAGS) -c -o pjxresources_en.o --resource 
pjxresources_en.properties ../resources/pjxresources_en.properties
	$(CROSS_COMPILE)gcj $(JFLAGS) $(OBJS) pjxresources_en.o ac3.o -
Djava.awt.headless=true --main=net.sourceforge.dvb.projectx.common.Start -
save-temps
	$(CROSS_COMPILE)gcc -o projectx $(OBJS) pjxresources_en.o ac3.o 
./net.sourceforge.dvb.projectx.common.Startmain.i \
	-shared-libgcc -Wl,-non_shared -lgcj -Wl,-call_shared -lsupc++ -Wl,--as-
needed -lgcc_s -lpthread -lc -lm -ldl -lrt -Wl,--no-as-needed
	$(CROSS_COMPILE)strip --strip-all projectx
and with the new nifty -static-libgcj convenience parameter
projectx-static:
	$(CROSS_COMPILE)gcj $(JFLAGS) -c -o ac3.o --resource ac3.bin 
../resources/ac3.bin
	$(CROSS_COMPILE)gcj $(JFLAGS) -c -o pjxresources_en.o --resource 
pjxresources_en.properties ../resources/pjxresources_en.properties
	$(CROSS_COMPILE)gcj -static-libgcj -o projectx $(SOURCES) 
pjxresources_en.o ac3.o \
	-Djava.awt.headless=true --main=net.sourceforge.dvb.projectx.common.Start
	$(CROSS_COMPILE)strip --strip-all projectx
however, what's different about this new program is that it requires that c++ 
compiled shared object libaacskeys.so and that's what causes my problems i 
guess
andreas