Not able to link against boost library

[Andreas S.]

Hi,

I don't any solution any more... I have written a small tool wich uses
the boost library. It compiles fine, but I can't link it.

I am on a Fedora Core 6 x86_64 system. The boost library is installed
with "yum install boost" - so this should be fine.

ldconfig | grep boost gives me a list with all the installed boost
libraries, including the two (libboost_files ystem.so and
libboost_regex. so) I need.

The LDFLAG is set to "-lstdc++ -newlib -libboost_regex
-libboost_filesy stem", which should include the boost libraries for the
linker, as far as I know.

but when i call g++ to link my two object files to the binary, it fails:

g++ -o hrmmerge HRMmerge.o fileinfo.o -L/usr/lib64

HRMmerge.o: In function `open_files(cha r*)':
HRMmerge.cpp:(. text+0x1f9): undefined reference to
`boost::filesys tem::path::path (char const*)'
HRMmerge.cpp:(. text+0x202): undefined reference to
`boost::filesys tem::exists(boo st::filesystem: :path const&)'
HRMmerge.cpp:(. text+0x254): undefined reference to
`boost::filesys tem::path::path (char const*)'
HRMmerge.cpp:(. text+0x29e): undefined reference to
`boost::filesys tem::path::leaf () const'
HRMmerge.cpp:(. text+0x2c2): undefined reference to
`boost::filesys tem::is_directo ry(boost::files ystem::path const&)'
HRMmerge.o: In function
`boost::filesys tem::directory_ iterator::direc tory_iterator(b oost::filesyste m::path
const&)':
HRMmerge.cpp:(. text._ZN5boost1 0filesystem18di rectory_iterato rC1ERKNS0_4path E[boost::filesyst em::directory_i terator::direct ory_iterator(bo ost::filesystem ::path
const&)]+0x2c): undefined reference to
`boost::filesys tem::detail::di r_itr_init(boos t::shared_ptr<b oost::filesyste m::detail::dir_ itr_imp>&,
boost::filesyst em::path const&)'
HRMmerge.o: In function `boost::basic_r egex<char,
boost::regex_tr aits<char, boost::cpp_rege x_traits<char >::assign(cha r
const*, char const*, unsigned int)':
HRMmerge.cpp:(. text._ZN5boost1 1basic_regexIcN S_12regex_trait sIcNS_16cpp_reg ex_traitsIcEEEE E6assignEPKcS7_ j[boost::basic_re gex<char,
boost::regex_tr aits<char, boost::cpp_rege x_traits<char >::assign(cha r
const*, char const*, unsigned int)]+0x27): undefined reference to
`boost::basic_r egex<char, boost::regex_tr aits<char,
boost::cpp_rege x_traits<char >::do_assign(ch ar const*, char const*,
unsigned int)'
and so on...

Anybody an idea what to do? My c++ experience is not really fresh
anymore and I am not too familiar with g++ and building software on
linux. So I am stuck :-(

Thanks in advance!
Andreas

[Daniel Kay]

Andreas S. wrote:

[...]

The LDFLAG is set to "-lstdc++ -newlib -libboost_regex
-libboost_filesy stem", which should include the boost libraries for the
linker, as far as I know.

Try to replace -libboost_regex against -lboost_regex and
-libboost_filesy stem against -lboost_filesyst em in your linker call.

[...]

CU,
Daniel Kay

[Rolf Magnus]

Andreas S. wrote:

The LDFLAG is set to "-lstdc++ -newlib -libboost_regex
-libboost_filesy stem",

libstdc++ is automatically linked, so you should drop it. Are you sure you
need newlib? It is meant for relatively small embedded systems, which you
don't seem to be writing your code for. Then change
'-libboost_regex -libboost_filesy stem'
into '-boost_regex -lboost_filesyst em'

which should include the boost libraries for the
linker, as far as I know.

but when i call g++ to link my two object files to the binary, it fails:

g++ -o hrmmerge HRMmerge.o fileinfo.o -L/usr/lib64

Uhm, where are your LDFLAGS?

Anybody an idea what to do? My c++ experience is not really fresh
anymore and I am not too familiar with g++ and building software on
linux. So I am stuck :-(

As a matter of fact, you are quite off-topic here, because this newsgroup is
only about the C++ language itself, not any build tools/compilers/linkers.
I suggest something like comp.unix.progr ammer .

[Andreas S.]

Daniel Kay wrote:

Andreas S. wrote:

[...]

>The LDFLAG is set to "-lstdc++ -newlib -libboost_regex
-libboost_filesy stem", which should include the boost libraries for
the linker, as far as I know.

Try to replace -libboost_regex against -lboost_regex and
-libboost_filesy stem against -lboost_filesyst em in your linker call.

[...]

CU,
Daniel Kay

Thanks! This and changing the order of the files to link solved the
problem. :-)
Greets,
Andreas