Re: [ooc-compiler] libgc - how to make dynamic?

[Michael v. A. <mi...@de...>]

Alan Freed <Ala...@gr...> writes:

> Hi,
> 
> I have tried to make OOC dynamically load its garbage collector with no
> luck.
> The only way I can get it to work is to have gc.a statically linked into
> the compiler
> when I build it.  Can anyone offer some suggestions?
> 
> First, here is some background information.
> 
> I run RedHat linux versions 7.1 and 7.2, which have libtool
> installed on them.  GC does not come with RedHat, nor is an rpm
> version available for it (to the best of my knowledge), so I built
> the GC from scratch and copied libgc.so.0 into the directory
> /usr/local/lib, which is in my path (it appears in /etc/ld.so.conf).
> 
> When I remove /gc from my /oo2c directory, make the distribution
> clean, and rerun configure, I get an error message stating that
> configure could not locate an installed libgc...  The only way I can
> build oo2c is leaving /gc under /oo2c, and when I do this the
> building of oo2c statically binds the garbage collector to it.  This
> is verified by executing ldd /usr/local/bin/oo2c where libgc.so.0 is
> found missing (the other dynamic links are present, when compared
> with Stewart Greenhill's output).

The test for libgc performed by configure tries to link against the
lib.  Possible causes for problems:

a) there is a stale config.cache file from a previous configure run
   ("make distclean" should have removed this, so this probably not
   the reason here)

b) the shared library was installed incompletely; IRIC, there must be
   at least a link without the version suffix to the "real" so file,
   like

     mia@freeman:/usr/lib$ ls -l libgc.so*
     lrwxrwxrwx    1 root     root           10 Dec 30  1999 libgc.so -> libgc.so.0*
     -rwxr-xr-x    1 root     root        89189 Oct 29  1999 libgc.so.0*

c) the libgc so file has wrong permissions (rx for world is probably
   required)

d) the shared library cache must be updated by running ldconfig (with
   -v it lists all the shared libs it picked up)

Hope this helps.

-- mva