if a DSO_load(NULL,...) operation fails, it will have to call DSO_free() on
the DSO structure it created and that will filter through to this "unload"
call.
If the stack size is "< 1", then the library never actually loaded. To keep
things clean higher up, I'll treat this as a vacuous case without an error.
It makes the error stack easier to follow real world cases, and the error
this ignores was only useful for catching bugs in internal code, not
mismatched calls from applications (which should be handled in the generic
DSO layer).
technique used is far from perfect and alternatives are welcome.
Basically if the translation flag is set, the string is not too
long, and there appears to be no path information in the string,
then it is converted to whatever the standard should be for the
DSO_METHOD in question, eg;
blah --> libblah.so on *nix, and
blah --> blah.dll on win32.
This change also introduces the DSO_ctrl() function that is used
by the name translation stuff.
* "no-dso" option available in Configure so that all DSO methods will
return NULL, overriding any support the platform might otherwise
have built.
* dlfcn_no_h config string now available rather than just dlfcn. This
is for platforms that have dlfcn.h functions but do not have (or
need) the dlfcn.h header file.
the build process (an upcoming commit no doubt), and is very much *new*
code - what that means is that it compiles ok - usually. It certainly
doesn't mean it runs well or even properly yet. Please don't muck round
with this unless you're looking to help out and hunt bugs. :-)
Currently this code doesn't have any support for controlling the "load"
behaviour (eg. paths, filename translations, etc). That'll be handled
using DSO_ctrl() and various flags, once we work out a sensible set of
flags.
