I'm working on porting a large project to IA64. Therefore I'd like to use the boost thread package on IA64 using gcc 3.2.3 (standard compiler on the SL 3 Linux distribution). There are some problems which I describe below and at the end of the mail I pose my questions. Thanks for any comments ! To test I use the following code: #include <stdlib.h> #include <boost/thread/mutex.hpp> int main() { boost::mutex mut; return 0; } I downloaded boost 1.33.0 & build & install it. When I try to compile it with g++ -g -O2 -pthread -I/opt/boostTest/include/boost-1_33 -L/opt/boostTest/lib -lboost_filesystem-gcc-mt -lboost_thread-gcc-mt -lpthread -lboost_regex-gcc-mt prog.c I get In file included from /opt/boostTest/include/boost-1_33/boost/thread/detail/config.hpp:18, from /opt/boostTest/include/boost-1_33/boost/thread/mutex.hpp:15, from prog.c:2: /opt/boostTest/include/boost-1_33/boost/config/requires_threads.hpp:47:5: #error "Compiler threading support is not turned on. Please set the correct command line options for threading: -pthread (Linux), -pthreads (Solaris) or -mthreads (Mingw32)" [many more "not declared" messages] Now I use "-DBOOST_HAS_THREADS", but this also does not help : g++ -g -O2 -pthread -DBOOST_HAS_THREADS -I/op/boostTest/include/boost-1_33 -L/opt/boostTest/lib -lboost_filesystem-gcc-mt -lboost_thread-gcc-mt -lpthread -lboost_regex-gcc-mt prog.c /usr/bin/ld: cannot find -lboost_thread-gcc-mt collect2: ld returned 1 exit status In the boost mailing list archive I found an IA64 patch posted by Ben Hutchings. Applying this patch and recompiling boost I get: g++ -g -O2 -pthread -I/opt/boostTest/include/boost-1_33 -L/opt/boostTest/lib -lboost_filesystem-gcc-mt -lboost_thread-gcc-mt -lpthread -lboost_regex-gcc-mt prog.c In file included from /opt/boostTest/include/boost-1_33/boost/thread/detail/config.hpp:18, from /opt/boostTest/include/boost-1_33/boost/thread/mutex.hpp:15, from prog.c:2: /opt/boostTest/include/boost-1_33/boost/config/requires_threads.hpp:47:5: #error "Compiler threading support is not turned on. Please set the correct command line options for threading: -pthread (Linux), -pthreads (Solaris) or -mthreads (Mingw32)" But when I use "-DBOOST_HAS_THREADS" everything works fine: g++ -g -O2 -pthread -DBOOST_HAS_THREADS -I/op/boostTest/include/boost-1_33 -L/opt/boostTest/lib -lboost_filesystem-gcc-mt -lboost_thread-gcc-mt -lpthread -lboost_regex-gcc-mt prog.c Here are my questions: Boost 1.33.0 contains the file boost/detail/sp_counted_base_gcc_ia64.hpp, nevertheless thread support seems not to work with gcc3.2.3. Thread support works by applying the patch and using "-DBOOST_HAS_THREADS". What is the status of boost 1.33.0 concerning IA64 ? I guess the patch has not been incorporated into the boost distribution ? On IA32 I can compile and use boost 1.33.0 threads using gcc3.2.3 without using "-DBOOST_HAS_THREADS". Why is this the case ? Ideally I would like to use the same compiler flags to compile a project using boost on IA32 and IA64. For some reasons I'd prefer to use boost 1.32.0 on IA64 but I could not get the thread package to work. Does boost 1.32.0 threads work on IA64/gcc3.2.3 ? Or is it only with boost 1.33.0 + patch that I can use them on IA64 ? Best regards, Andreas