Linking to Pthreads - Undefined References With Mingw

I'm trying to use pthreads and am getting undefined references. Here's the command line

Code:

C:/Bin/Mingw/bin/../libexec/gcc/mingw32/3.4.2/collect2.exe -Bdynamic -o Stktest.exe C:/Bin/Mingw/bin/../lib/gcc/mingw32/3.4.2/../../../crt2.o C:/Bin/Mingw/bin/../lib/gcc/mingw32/3.4.2/crtbegin.o -LC:\Bin\Stk\bin -LC:\Bin\Mingw\Lib -LC:\Bin\Pthreads\lib -LC:/Bin/Mingw/bin/../lib/gcc/mingw32/3.4.2 -LC:/Bin/Mingw/bin/../lib/gcc -LC:/Bin/Mingw/bin/../lib/gcc/mingw32/3.4.2/../../../../mingw32/lib -LC:/Bin/Mingw/bin/../lib/gcc/mingw32/3.4.2/../../.. Debug\stdafx.o Debug\Stktest.o -lpthreadGC2 -lstk -lstdc++ -lmingw32 -lgcc -lmoldname -lmingwex -lmsvcrt -luser32 -lkernel32 -ladvapi32 -lshell32 -lmingw32 -lgcc -lmoldname -lmingwex -lmsvcrt C:/Bin/Mingw/bin/../lib/gcc/mingw32/3.4.2/crtend.o C:\Bin\Stk\bin/libstk.a(RtAudio.o): In function `ZN5RtApiD0Ev':C:/Bin/Stk/src/RtAudio.cpp:263: undefined reference to `_imp__pthread_mutex_destroy' C:\Bin\Stk\bin/libstk.a(RtAudio.o): In function `ZN5RtApiD1Ev':C:/Bin/Stk/src/RtAudio.cpp:263: undefined reference to `_imp__pthread_mutex_destroy' C:\Bin\Stk\bin/libstk.a(RtAudio.o): In function `ZN5RtApiD2Ev':C:/Bin/Stk/src/RtAudio.cpp:263: undefined reference to `_imp__pthread_mutex_destroy' C:\Bin\Stk\bin/libstk.a(RtAudio.o): In function `ZN5RtApiC1Ev':C:/Bin/Stk/src/RtAudio.cpp:258: undefined reference to `_imp__pthread_mutex_init' C:\Bin\Stk\bin/libstk.a(RtAudio.o): In function `ZN5RtApiC2Ev':C:/Bin/Stk/src/RtAudio.cpp:258: undefined reference to `_imp__pthread_mutex_init'

Here's the dumpbin of the pthreads library I'm linking against

Code:

C:\Bin\Pthreads\lib>dumpbin libpthreadGC2.a /exports Microsoft (R) COFF/PE Dumper Version 8.00.50727.762 Copyright (C) Microsoft Corporation. All rights reserved. Dump of file libpthreadGC2.a File Type: LIBRARY Exports ordinal name _sem_wait _sem_unlink _sem_trywait _sem_timedwait _sem_post_multiple ... _pthread_mutexattr_destroy _pthread_mutex_unlock _pthread_mutex_trylock _pthread_mutex_timedlock _pthread_mutex_lock _pthread_mutex_init _pthread_mutex_destroy ... Summary 0 .bss 0 .data 14 .idata$2 1D4 .idata$4 1D4 .idata$5 B10 .idata$6 1DC .idata$7 398 .text C:\Bin\Pthreads\lib>

A similar thread I found was here: http://sourceware.org/ml/pthreads-wi.../msg00056.html
Answer here: http://sourceware.org/ml/pthreads-wi.../msg00058.html

But the case of link order doesn't seem to be the issue, but my dumpbin doesn't contain these '_imp_xxx' references, so I'm not exactly sure what to do

Quote:

Originally Posted by Tonto

But the case of link order doesn't seem to be the issue, but my dumpbin doesn't contain these '_imp_xxx' references, so I'm not exactly sure what to do

Have you actually TRIED putting it last on the link line? Libraries often contain weak symbols which alias other symbols in the library. The _imp_xxx symbols might be there, but dumpbin isn't showing them.

Ah that is very interesting (I only dumped the exports, didn't know I should look at anything else)

Code:

String Table Size = 0x5D bytes COFF SYMBOL TABLE 000 00000000 SECT1 notype Static | .text 001 00000000 SECT2 notype Static | .data 002 00000000 SECT3 notype Static | .bss 003 00000000 SECT4 notype Static | .idata$7 004 00000000 SECT5 notype Static | .idata$5 005 00000000 SECT6 notype Static | .idata$4 006 00000000 SECT7 notype Static | .idata$6 007 00000000 SECT1 notype External | _pthread_mutexattr_init 008 00000000 SECT5 notype External | __imp__pthread_mutexattr_init 009 00000000 UNDEF notype External | __head_libpthreadGC2_a String Table Size = 0x49 bytes COFF SYMBOL TABLE 000 00000000 SECT1 notype Static | .text 001 00000000 SECT2 notype Static | .data 002 00000000 SECT3 notype Static | .bss 003 00000000 SECT4 notype Static | .idata$7 004 00000000 SECT5 notype Static | .idata$5 005 00000000 SECT6 notype Static | .idata$4 006 00000000 SECT7 notype Static | .idata$6 007 00000000 SECT1 notype External | _pthread_mutex_destroy 008 00000000 SECT5 notype External | __imp__pthread_mutex_destroy 009 00000000 UNDEF notype External | __head_libpthreadGC2_a

>> Have you actually TRIED putting it last on the link line?

Yeah I don't know how I read it this way but I just thought it meant after the object files on the command line. Sorry about that, it now compiles perfectly. Gahd I'm thickheaded.

>> Libraries often contain weak symbols which alias other symbols in the library.

Cool, I didn't know that.

Quote:

Originally Posted by Tonto

Yeah I don't know how I read it this way but I just thought it meant after the object files on the command line. Sorry about that, it now compiles perfectly. Gahd I'm thickheaded.

The exact error message was a clue:

Quote:

C:\Bin\Stk\bin/libstk.a(RtAudio.o): In function `ZN5RtApiD0Ev':C:/Bin/Stk/src/RtAudio.cpp:263: undefined reference to `_imp__pthread_mutex_destroy'

The undefined reference is in libstk.a, NOT your code. That means the pthreads library had to be listed AFTER libstk on the link line.

Pay attention to the error messages ;-)