Bad patchwork: libgcj.so: undefined reference to `gcj_describe_type_fn'

Thu Mar 16 20:25:00 GMT 2006

> Martin> $ blah-blah-nm-blah-grep
> Martin> U gcj_describe_type_fn
>> Is this in boehm-gc? It is somewhat odd to have boehm-gc depend on
> symbols provided by libgcj -- that is backward.
That is indeed backwards, yes... But it's only temporary debug stuff - 
and hopefully it will work...
> Martin> and libjava/boehm.o does indeed contain the function (or what):
> Martin> libjava/ $ powerpc-405-linux-gnu-nm boehm.o | grep gcj_de
> Martin> 00000960 T _Z20gcj_describe_type_fnPvPc
>> This is the mangled form, whereas the above is not.
>> This is presumably because you are referencing the symbol from C
> code, but the function definition is in C++. You need an 'extern "C"'
> to fix this.
I now added the extern "C" part, and did a lot of make'ing. The 
libgcjgc_convenience.a still seem to contain a "undefined" reference to 
the gcj_describe_type_fn, but nevertheless, I tried compiling my 
application again (don't know why I tried, though), and now it no longer 
complains about it. Don't know if it was the "make all" or the 'extern 
"C"' that did it...
So, at least my application compiles now, but let's see in the morrow if 
it works on runtime :-)
Thanks so far,
 Martin - still stuck behind a paranoid firewall at work!