Re: [Boost-users] Trouble building 32bit version

Subject: Re: [Boost-users] Trouble building 32bit version
From: Vladimir Prus (vladimir_at_[hidden])
Date: 2010-08-06 01:12:50

Noah Roberts wrote:

> I have a 64bit Linux system and I need to build boost for 32bit in order
> to link to this library I have to use.  Trouble is that I keep getting
> this error when I try to link to any boost library:
> 
> nroberts_at_Adad:~$ g++ test.cpp -m32 -L/home/nroberts/boost-x86/lib
> -lboost_thread-gcc44-mt
> /home/nroberts/boost-x86/lib/libboost_thread-gcc44-mt.so: undefined
> reference to `__sync_fetch_and_add_4'
> collect2: ld returned 1 exit status
> 
> test.cpp just contains an empty main().
> 
> I've tried google and arrived at various places:
> 
> http://stackoverflow.com/questions/130740/link-error-when-compiling-gcc-atomic-operation-in-32-
bit-mode
> http://old.nabble.com/compiling-32-bit-boost-libraries-on-a-64-bit-system--%28gcc,-Linux%29-
td22087063.html
> 
> Among others.  I'm trying to build version 1.38.
> 
> Here's my last attempt at supplying bjam with the correct parameters:
> 
> bjam architecture=x86 address-model=32 toolset=gcc instruction-set=i686
> stage

This seems about right. You might want to add 

        -a --with-thread

to completely rebuild the thread library. Then, check timestamp at 

        /home/nroberts/boost-x86/lib/libboost_thread-gcc44-mt.so

to make sure it was rebuilt.

> It's funny though, even at the link in the reply held at nabble.com the
> documentation doesn't seem to have anything on any of these parameters.
>   They don't appear in the bjam --help output either.  So I seem to be
> kind of screwed in figuring this out myself.  I'm just trying to guess
> until I get it but I'm out of ideas.  

You might want to thanks gcc developers for this mess. __sync_fetch_and_add_4
is a popular error with Boost, especially for not-exactly-native configurations,
due to the fact that gcc always provides certain builtin, which sometimes does
not work.

- Volodya

> What do I need to do?
> 
> Thanks.