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

[David Daney <ddaney at avtrex dot com>]

Martin Egholm Nielsen wrote:
> Hi,
>
> (For those not reading my desparate attempts on the GC list:)
> I'm trying to trace some stuff in the garbage collector being 
> responsible for doubling my GC times.
> In that attempt Hans Boehm has guided me into using the method 
> "gcj_describe_type_fn" defined in "libjava/boehm.cc" - defined for newer 
> releases, that is. Now, I'm quite stuck with the 3.4.x branch, hence 
> this method is not there.
> So I just patched it in from SVN trunk (though removing the 
> static'ness), and everything (boehm and libjava) compiles just fine. 
> However, the minute I try to compile my own application, I get the 
> following error message:
>
> --- 8< 8< 8< ---
> lib/libgcj.so: undefined reference to `gcj_describe_type_fn'
> collect2: ld returned 1 exit status
> --- 8< 8< 8< ---

I don't know for sure, but the object file containing the definition of 
that function should probably be in:

libgcjgc_convenience.a

You may want to use nm to confirm that that symbol is defined in said 
library.

David Daney.