undefined symbol: _ZL22__gthrw_pthread_cancelm error-Collection of common programming errors

I have a C++/C application which needs to be compiled as a 32 bit application (as there are certain third-party libraries only available for 32 bit). However, the compilation as well as the execution will happen on CentOS 6.4 x86_64 machine.

I am using gnu autotools for building. After doing a lot of googling, finally figured a sets of options to give to ./configure to create 32 bit executables/shared objects. Set the LD_LIBRARY_PATH to search in /lib, /usr/lib/, /usr/lib/gcc/... instead of /lib64, ... Verified that all the generated .so and executable are 32 bit by using file command.

But I get the error: “undefined symbol: _ZL22__gthrw_pthread_cancelm” if I run the executable.

Any clues?

1. It seems you forgot to link to pthreads with -lpthread.

   GCC adds a layer of abstraction over pthreads and this abstraction use weak symbols, so you can build your executable without link error but fail at runtime.

2. Is there a 32bits pthread library on your target host? If not, I guess you need to get one installed. Also inspect the output of ldd on your target host, this might help you find out what is missing.

Originally posted 2013-11-09 23:11:31.