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

[Ross Johnson <rpj@callisto.canberra.edu.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
>>
>>
>>  
>>
>