Re: Failure during initdb - creating dictionaries ... FATAL: could not access file "$libdir/libdict_snowball": No such file or directory

[Martin Gainty <mgainty@xxxxxxxxxxx>]

makes you wonder what possible use a MH_DYLIB library might serve

Martin
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> Date: Fri, 15 May 2009 08:36:48 +0800
> From: craig@xxxxxxxxxxxxxxxxxxxxx
> To: tgl@xxxxxxxxxxxxx
> CC: lists@xxxxxxxxxxx; pgsql-general@xxxxxxxxxxxxxx
> Subject: Re: Failure during initdb - creating dictionaries ... FATAL: could not access file "$libdir/libdict_snowball": No such file or directory
>
> Tom Lane wrote:
>
> > I don't recall the details at the moment, but I think we intentionally
> > didn't adopt the .dylib extension for these files because of some subtle
> > difference between them and plain shared libraries.
>
> If I recall correctly from porting a plugin-based app to Mac OS X a few
> years ago, there are issues with dlopen(...) on .dylib libraries.
>
> I seem to remember having issues getting dylibs to resolve symbols from
> the loading executable and already-loaded libraries; they wanted to
> resolve all symbols as direct dependencies. I needed to use a .so to get
> the library to resolve symbols in the loading application.
>
> A quick bit of reading shows that:
>
> - The extension doesn't matter, the OS doesn't care
>
> - The library type, MH_DYLIB or MH_BUNDLE, is controlled by how
> it's built only
>
> - MH_DYLIB won't resolve symbols from the loading executable
> and can't be unloaded, whereas MH_BUNDLE does and can.
>
> - Most libraries on Mac OS X are MH_DYLIB
>
> Found some info at:
>
> http://developer.apple.com/documentation/DeveloperTools/Conceptual/MachORuntime/Reference/reference.html#//apple_ref/doc/uid/20001298-BAJHHFFF
>
> under Fields, section "filetype"
>
> --
> Craig Ringer
>
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