Re: Dependencies when using gcc-generated object files in another compiler

[David Daney <ddaney at avtrex dot com>]

Looks like the greenhills compilers don't use the same ABI and GCC. 
Interpoperation at the C++ and Java level would be quite difficult.  You 
don't say what the OS is, but the java runtime (libgcj) would need 
porting as well.  It relies heavily on the OS for thread support, signal 
handling, locks...

Your best bet might be to use gcc for everything if possible.

FWIW, we are using GCC to run java programs on embedded mips (on Linux) 
with great success.

David Daney

Lehner, Michael wrote:
> Hi,
>
> I am working on including java-code into an self-written operating system. The used tool chain is a Greenhills one, but it is not able to translate java to native code. For this reason I am using gcj to translate my java code to native mips code and then link with Greenhills the whole project. But the linker complains, as expected, about unresolved symbols, even when I include all the archives from the libs dir of my cross compiler. The Problem is I have no idea, where I could search for the rest of the objects I need. Perhaps someone could tell me if gcc searches somewhere else too for libs when cross compiling.
>
> Errors by Greenhills:
>
> [elxr] (error) unresolved symbols: 61
>  __gcj_personality_v0   from Main.o
>  _gp_disp   from Main.o
>  _Unwind_Resume   from gnulib.a(Class.o)
>  _Jv_Throw from gnulib.a(Class.o)
>  __fixdfdi from gnulib.a(lt15-lang.o)
>  __fixsfdi from gnulib.a(lt15-lang.o)
>  __floatdisf      from gnulib.a(lt15-lang.o)
>  __floatdidf      from gnulib.a(lt15-lang.o)
>  __moddi3   from gnulib.a(lt15-lang.o)
>  __divdi3   from gnulib.a(lt15-lang.o)
>  _ZN4java4util5regex7Pattern7compileEPNS_4lang6StringE      from gnulib.a(lt15-lang.o)
>  _ZN4java4util5regex7Pattern5splitEPNS_4lang12CharSequenceEi      from gnulib.a(lt15-lang.o)
>  _ZN4java4util5regex7Pattern7matcherEPNS_4lang12CharSequenceE     from gnulib.a(lt15-lang.o)
>  _ZN4java4util5regex7Matcher10replaceAllEPNS_4lang6StringE from gnulib.a(lt15-lang.o)
>  _ZN4java4util5regex7Matcher12replaceFirstEPNS_4lang6StringE      from gnulib.a(lt15-lang.o)
>  _ZN4java4util5regex7Pattern7matchesEPNS_4lang6StringEPNS3_12CharSequenceE    from gnulib.a(lt15-lang.o)
>  _ZN4java4util5regex7Matcher5groupEi      from gnulib.a(lt18-net.o)
>  _ZN4java4util5regex7Matcher7matchesEv    from gnulib.a(lt18-net.o)
>  _ZN4java4util5regex7Pattern6class$E      from gnulib.a(lt18-net.o)
>  _ZN4java4util5regex7Matcher9lookingAtEv from gnulib.a(lt29-text.o)
>  _ZN4java4util5regex7Matcher3endEv from gnulib.a(lt29-text.o)
>  __libc_malloc_initialized    from gnulib.a(mcheck.o)
>  __free_hook      from gnulib.a(mcheck.o)
>  __malloc_hook    from gnulib.a(mcheck.o)
>  __memalign_hook from gnulib.a(mcheck.o)
>  __realloc_hook   from gnulib.a(mcheck.o)
>  memalign   from gnulib.a(mcheck.o)
>  __udivdi3 from gnulib.a(posix-threads.o)
>  __umoddi3 from gnulib.a(posix-threads.o)
>  _errno     from gnulib.a(pthread.o)
>  _ZN3gnu9classpath5debug12SystemLogger6class$E from gnulib.a(security.o)
>  _ZN3gnu9classpath5debug12SystemLogger6SYSTEME from gnulib.a(security.o)
>  _ZN3gnu9classpath5debug9Component6POLICYE      from gnulib.a(security.o)
>  _ZN3gnu9classpath5debug9Component6class$E      from gnulib.a(security.o)
>  _Unwind_Backtrace      from gnulib.a(stacktrace.o)
>  _Unwind_GetRegionStart       from gnulib.a(stacktrace.o)
>  _Unwind_GetIP    from gnulib.a(stacktrace.o)
>  ____strtoul_l_internal       from gnulib.a(strtoul.o)
>  _ZN3gnu9classpath5debug9Component4X509E from gnulib.a(x509.o)
>  _ZN3gnu9classpath5debug9Component6CRYPTOE      from gnulib.a(crypto.o)
>  __current_locale_name from gnulib.a(dcigettext.o)
>  _IO_vfprintf     from gnulib.a(iovsprintf.o)
>  _ZN3gnu4java6locale17LocaleInformation6class$E       from gnulib.a(lang.o)
>  _ZN3gnu4java6locale8Calendar6class$E     from gnulib.a(lang.o)
>  __real_malloc    from gnulib.a(mf-runtime.o)
>  __real_free      from gnulib.a(mf-runtime.o)
>  __real_calloc    from gnulib.a(mf-runtime.o)
>  __real_main      from gnulib.a(mf-runtime.o)
>  __libc_memalign from gnulib.a(dl-tls.o)
>  __fini_array_start     from gnulib.a(elf-init.o)
>  __fini_array_end       from gnulib.a(elf-init.o)
>  __preinit_array_start from gnulib.a(elf-init.o)
>  __preinit_array_end    from gnulib.a(elf-init.o)
>  __init_array_start     from gnulib.a(elf-init.o)
>  __init_array_end       from gnulib.a(elf-init.o)
>  __real_mmap      from gnulib.a(mf-hooks1.o)
>  __real_munmap    from gnulib.a(mf-hooks1.o)
>  __real_realloc   from gnulib.a(mf-hooks1.o)
>  __strtod_internal      from gnulib.a(vfscanf.o)
>  ____strtoll_l_internal       from gnulib.a(strtoll.o)
>  ____strtoull_l_internal      from gnulib.a(strtoull.o)
>
> [elxr] (error) errors during processing
>
> Michael