[squeak-dev] Re: [Pharo-project] Alien & Squeak FFI issues on
Snow Leopard.
John M McIntosh
johnmci at smalltalkconsulting.com
Wed Sep 30 18:19:55 UTC 2009
The reason for the SqueakPluginsBuiltInOrLocalOnly was to prevent the
VM from looking in about 100 places for a plugin before deciding to
use the one built into the VM
this saved several 10 of ms in launch time. At the time there was also
a transition period between PowerPC and Universal plugins, the
historical algorithm would try to load powerpc
plugins lying loose in a developer's various libraries, versus using
the newly complied ones supplied by the VM.
So setting SqueakPluginsBuiltInOrLocalOnly to NO might lead to other
interesting issues, versus for example doing a 'ln -s /usr/lib/
libc.dylib libc.dylib in the VM's resource folder.
I will look at changing sqMacUnixExternalPrims.c to allow absolute
paths, and also consider the changes Ian made lately to reduce the
amount of searching that the original UnixExternalPrims.c did.
On 2009-09-30, at 9:04 AM, Eliot Miranda wrote:
> Craig Latta found a simple work-around which is to set the VM's
> Info.plist variable "SqueakPluginsBuiltInOrLocalOnly" to false, so
> that libraries are found on Snow Leopard. Up until now things have
> been being found through vagaries if the Mac OS X dlopen call which
> would, I think, search the paths in an executable used to find
> dlls. i.e. prior to Snow Leopard if you tried to run something in
> libSystem.B.dylib and you traced the logic in
> sqMacUnixExternalPrims.c you'd find that dlopen was "finding"
> libSystem.B.dylib in VM.app/Contents/Resources, even though it is
> not there.
>
> Personally I think that sqMacUnixExternalPrims.c is ripe for a
> rewrite. It is torturously complex. But Craig's workaround works
> for us and takes the pressure off.
>
> P.S. I'm not on the Pharo list. Can someone forward this for me?
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John M. McIntosh <johnmci at smalltalkconsulting.com> Twitter:
squeaker68882
Corporate Smalltalk Consulting Ltd. http://www.smalltalkconsulting.com
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