Re: Problem linking in pthread librarry.... (Newbie)

[Ross Johnson <rpj at callisto dot canberra dot edu dot au>]

Ed Hume wrote:

> I believe the __imp__ prefix comes from the functions being declared
> as DLL imported/exported symbols.  So I think you need to go review
> the header files, and fix up some macros in your makefile so that the
> __declspec(dllexport) macros are not used.  (For example, have your
> definition of PTW_EXTERN)

If that's all that's required, I propose to change the following in 
pthread.h:-

#ifdef _DLL
#  ifdef PTW32_BUILD
#    define PTW32_DLLPORT __declspec (dllexport)
#  else
#    define PTW32_DLLPORT __declspec (dllimport)
#  endif
#endif

to:-

#ifndef PTW32_STATIC
#  ifdef PTW32_BUILD
#    define PTW32_DLLPORT __declspec (dllexport)
#  else
#    define PTW32_DLLPORT __declspec (dllimport)
#  endif
#endif

And require that PTW32_STATIC be defined explicitly as a compiler flag 
for both static library build and application build.

Thanks.
Ross

> Srdjan wrote:
>
> > Hi,
> >
> > After reading all the readme's and FAQs I still have a bit of a problem
> > linking with pthread for win32. Somebody might have already solved it...
> >
> > Here is the problem....
> >
> > I am porting a small daemon program from linux to win32 (... yes, I
> > know...). Anyway, becasue this little beast is supposed to be used on
> > systems that I am unable to install the pthread.dll, I am trying to 
> > build a
> > static pthread library and link it in with my code.
> >
> > I have fudged building process using VC7.1 (.NET) so it does build a 
> > .lib
> > file, however, when I try linking with my code, I get the following link
> > problems:
> >
> > ============================================================================
> > =============
> > fdca.obj : error LNK2019: unresolved external symbol __imp__pthread_join
> > referenced in function _main
> > fdca.obj : error LNK2019: unresolved external symbol 
> > __imp__pthread_create
> > referenced in function _main
> > fdca_schedule.obj : error LNK2001: unresolved external symbol
> > __imp__pthread_create
> > fdca_collect.obj : error LNK2019: unresolved external symbol
> > __imp__pthread_exit referenced in function _fdca_collect
> > fdca_command.obj : error LNK2019: unresolved external symbol
> > __imp__pthread_exit referenced in function _fdca_command
> > fdca_schedule.obj : error LNK2001: unresolved external symbol
> > __imp__pthread_exit
> > ds.lib(ds.obj) : error LNK2019: unresolved external symbol
> > __imp__pthread_mutex_init referenced in function _ds_list_init
> > ds.lib(ds.obj) : error LNK2019: unresolved external symbol
> > __imp__pthread_mutex_unlock referenced in function _ds_list_insert
> > ds.lib(ds.obj) : error LNK2019: unresolved external symbol
> > __imp__pthread_mutex_lock referenced in function _ds_list_insert
> > .\/winagent.exe : fatal error LNK1120: 7 unresolved externals
> > ============================================================================
> > =============
> >
> > Now, I am sure I have stuffed up something, but I can't figure out what
> > (obvious conclusion :-). My code seems to generate 
> > '__imp__function_name'
> > instead of '_function_name'. I have a number of other external static
> > libraries I am linking with, but they all seem to be linking in happily.
> >
> > The Makefile with nmake builds only a DLL version, and I am trying at 
> > the
> > moment to get it to build a static lib too, but with not much success.
> >
> > I would be ethernally grateful if somebody was able to quickly 
> > identify what
> > I am doing wrong.
> >
> > Cheers,
> >
> > Srdjan
> > Melbourne
> >
> >
> >