Re: Tcl_CreateSlave error (pg 7.1.2, RH 7.2)

Janine Sisk <janine(at)furfly(dot)net> writes:
> gcc -pipe -shared -Wl,-soname,libtcl.so.0 -o pltcl.so pltcl.o -L/usr/lib
> -ltcl -ldl -lieee -lm -lc

Oh, oh, oh ... now I remember. See that -Wl,-soname,libtcl.so.0 switch?
That's causing pltcl.so to be marked internally with the soname
libtcl.so.0, thus the linker does not think it needs to link anything
else to resolve that reference. (This is arguably a bug in the Red Hat
RPMs for Tcl: they put that switch into the link arguments that the Tcl
config script advertises as being correct to use when trying to link
against Tcl. PG 7.2 has a defense against this, but 7.1.* did not.)

Probably your easiest fix is to manually repeat the link step for
pltcl.so with the -Wl bit removed, ie just

gcc -pipe -shared -o pltcl.so pltcl.o -L/usr/lib -ltcl -ldl -lieee -lm -lc

regards, tom lane