poco c++ static linking problems with undefined references to symbols

Question

I'm trying to link to static versions of the POCO C++ libs like this:

g++ BCCMain.o -L$_POCO_LIBS -Wl,-Bstatic $_POCO_LIBS/libPocoFoundation.a $_POCO_LIBS/libPocoUtil.a $_POCO_LIBS/libPocoXML.a $_POCO_LIBS/libPocoJSON.a -Wl,-Bdynamic -o BCMain

Unfortunatelly this gives errors about some undefined references to symbols like:

Poco::Logger::get(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)

even though Poco::Logger::get(std::string const&) actually IS defined in libPocoFoundation.a.

Now if I try to link to a shared version of the foundation lib it works:

g++ BCCMain.o -L$_POCO_LIBS -Wl,-Bstatic $_POCO_LIBS/libPocoFoundation.a $_POCO_LIBS/libPocoUtil.a $_POCO_LIBS/libPocoXML.a $_POCO_LIBS/libPocoJSON.a -Wl,-Bdynamic -lPocoFoundation -o BCMain

Static and shared versions of the libs have the same symbols so I find it hard to figure what I'm doing wrong.

Ubuntu/Linaro. g++ 4.6.3

Answer 1

My experience is that the order of linking the Poco libraries is important when statically linked. Seems important Foundation to be the last one.

The order that works for me is:

1. Util
2. Net
3. XML
4. Foundation