PThread Issue: -pthread vs. -lpthread for a new port

[Ulrich Spoerlein]

On Mon, 03.01.2005 at 16:36:36 +0100, Michael Nottebrock wrote:
> > And running a ruby program requiring wxruby I get this error:
> > /libexec/ld-elf.so.1: /usr/local/lib/libgthread-2.0.so.400: Undefined
> > symbol "pthread_getschedparam"
> 
> This is expected: When shared libraries are linked with -pthread, the linker 
> only resolves the necessary symbols but does not emit a DT_NEEDED symbol for 
> the resulting shared library, it only does for programs.
> 
> Bottom line: Pthread symbols must always be resolved through the actual 
> program. Make sure the program that uses wxruby is linked with -pthread as 
> well.

wxruby.so get's loaded by ruby on demand. That is when using 'require
wxruby'. I'm pretty sure we don't want to link pthread into ruby itself.

% irb
irb(main):001:0> require "wxruby"
/libexec/ld-elf.so.1: /usr/local/lib/libgthread-2.0.so.400: Undefined symbol "pthread_getschedparam"

% LD_PRELOAD=/usr/lib/libpthread.so.1 irb
irb(main):001:0> require "wxruby"
=> true
irb(main):002:0>

Preloading libc_r.so works too, of course.

(irb is the interactive ruby shell)

Ulrich Spoerlein
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Ok, which part of "Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn."
didn't you understand?
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