Question

I have no trouble building 1.35.0, as well as 1.36.0 on the timesys arm-gcc toolchain, both statically (link-static) as well as dynamically (.so, default option).

However, when I try to link a simple sample filesystem app:

#include <boost/filesystem.hpp> #include <iostream>  namespace fs = boost::filesystem;  int main(int argc, char *argv[]) {     const char* fileName = argv[1];     std::cout << 'file: ' << fileName << ' => ' << fs::exists(fileName) << std::endl;     return 0; } 

I get the following linker error:

 developer@eldp01:~/boost/test$ /opt/timesys/at91sam9263_ek/toolchain/bin/armv5l-timesys-linux-gnueabi-gcc    exists.cpp -o exists.exe -I ../boost_1_35_0/ -lboost_filesystem -lboost_system -lstdc++ -L .  /tmp/ccex3NGb.o: In function `boost::detail::atomic_decrement(int*)': exists.cpp:(.text._ZN5boost6detail16atomic_decrementEPi[boost::detail::atomic_decrement(int*)]+0x1c):    undefined reference to `__sync_fetch_and_add_4'  /tmp/ccex3NGb.o: In function `boost::detail::atomic_increment(int*)': exists.cpp:(.text._ZN5boost6detail16atomic_incrementEPi[boost::detail::atomic_increment(int*)]+0x1c):    undefined reference to `__sync_fetch_and_add_4'  collect2: ld returned 1 exit status 

Does anyone know how I can get Boost to build for the gcc-arm toolchain?

Answer 1

You need to add in file ‘boost_1_35_0/boost/config/user.hpp’:

#define BOOST_SP_USE_PTHREADS 

btw, you need to set the gcc tool-chain in file ‘boost_1_35_0/tools/build/v2/user-config.jam’ to:

using gcc         : arm         : /opt/timesys/at91sam9263_ek/toolchain/bin/armv5l-timesys-linux-gnueabi-gcc ; 

This will solve the problem of linking now.