Question

Am getting the following error when i tried to cmompile the code which uses the library

http://msgpack.org/ , i tried the first example in C++ section ( documentation of library )

g++ hello.cc -lmsgpack -o hello

/usr/local/lib/libmsgpack.so: undefined reference to `__sync_sub_and_fetch_4'

Any help is appreciable ..

g++ version details ..

$ g++ -v
Using built-in specs.
Target: i386-redhat-linux
Configured with: ../configure –prefix=/usr –mandir=/usr/share/man –infodir=/usr/share/info –enable-shared –enable-threads=posix –enable-checking=release –with-system-zlib –enable-__cxa_atexit –disable-libunwind-exceptions –enable-libgcj-multifile –enable-languages=c,c++,objc,obj-c++,java,fortran,ada –enable-java-awt=gtk –disable-dssi –enable-plugin –with-java-home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre –with-cpu=generic –host=i386-redhat-linux
Thread model: posix
gcc version 4.1.2 20080704 (Red Hat 4.1.2-46)

Answer 1

This one worked for me …

Update your GCC tool-chain. Or try to add -march=pentium or -march=i486, etc.

@qehgt Thanks a lot 🙂