LinuxQuestions.org - [SOLVED] undefined reference to 'pthread

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- - undefined reference to 'pthread_create' from linker (https://www.linuxquestions.org/questions/programming-9/undefined-reference-to-pthread_create-from-linker-818399/)

undefined reference to 'pthread_create' from linker

I am having trouble linking the pthread library.

I have -lpthread -lm as options for the GNU GCC compiler.

Build Log
------------------------------------------------------------
Compiling: main.c
Compiling: matrix.c
Compiling: newmalloc.c
Linking console executable: bin/Release/optimizer-4
obj/Release/main.o: In function `main':
main.c:(.text+0x132): undefined reference to `pthread_attr_setstacksize'
main.c:(.text+0x224): undefined reference to `pthread_create'
main.c:(.text+0x35b): undefined reference to `pthread_join'
collect2: ld returned 1 exit status
Process terminated with status 1 (0 minutes, 1 seconds)
3 errors
-------------------------------------------------------------
library search:
dlyon@dlyon-desktop2:~$ ls /usr/lib |grep pthread
libgpgme-pthread.so.11
libgpgme-pthread.so.11.7.0
libpthread.a
libpthread_nonshared.a
libpthread.so
dlyon@dlyon-desktop2:~$
-------------------------------------------------------------

Any ideas would be greatly appreciated! Thanks!

with out knowing what you are building we can not even guess
something is missing in some code ?? as to what ??
without seeing it ....

From man gcc (search for -llibrary in there)

Quote:

It makes a difference where in the command you write this option; the linker searches and processes libraries and object files in the order they are specified. Thus, foo.o -lz bar.o searches library z after file foo.o but before bar.o. If bar.o refers to functions in z, those functions may not be loaded.

Maybe that's the problem?