Re: [Boost-users] How do you compile Boost C++ code in Ubuntu?

Greetings, I realized that when I installed certain packages from the Ubuntu Software Center, I had broken some dependencies. That may have caused the problem. Now, I have reinstalled Boost C++. See the following for a snippet from the Terminal session that indicates the availability of the previously missing files. Go Bears >ls -al | grep libboost_system -rw-r--r-- 1 root root 48666 Jan 2 2012 libboost_system.a lrwxrwxrwx 1 root root 17 Jan 2 2012 libboost_system-mt.a -> libboost_system.a lrwxrwxrwx 1 root root 25 Jan 2 2012 libboost_system-mt.so -> libboost_system.so.1.46.1 lrwxrwxrwx 1 root root 25 Jan 2 2012 libboost_system.so -> libboost_system.so.1.46.1 -rw-r--r-- 1 root root 14568 Jan 2 2012 libboost_system.so.1.46.1 Go Bears > Go Bears >make all g++ -L/usr/lib -lboost_system get_sys_info.cpp /tmp/cckONUUl.o: In function `__static_initialization_and_destruction_0(int, int)': get_sys_info.cpp:(.text+0x13f): undefined reference to `boost::system::generic_category()' get_sys_info.cpp:(.text+0x14b): undefined reference to `boost::system::generic_category()' get_sys_info.cpp:(.text+0x157): undefined reference to `boost::system::system_category()' /tmp/cckONUUl.o: In function `boost::filesystem3::path::codecvt()': get_sys_info.cpp:(.text._ZN5boost11filesystem34path7codecvtEv[boost::filesystem3::path::codecvt()]+0x5): undefined reference to `boost::filesystem3::path::wchar_t_codecvt_facet()' collect2: ld returned 1 exit status make: *** [all] Error 1 Go Bears > So, I am back to square one with the "undefined reference" compilation error. Can you please kindly suggest how can I resolve this problem? Thank you. Regards On Thu, Feb 7, 2013 at 8:33 AM, Mateusz Loskot wrote:

On 7 February 2013 15:21, Giovanni wrote:

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I had set the shell variable $LD_LIBRARY_PATH to: /usr/lib/libboost_system.so. It was originally empty. I used the "echo" command to reflect the path that I had set it to.

I tried to make a point not about how you did set the variable, but about the fact it has incorrect value. Let me copy it once again:

"LD_LIBRARY_PATH, which is a colon-separated list of directories" [1]

[1] http://tldp.org/HOWTO/Program-Library-HOWTO/shared-libraries.html

And you may learn from that what the LD_LIBRARY_PATH is meant to be.

...

I had installed it with Ubuntu Software Center. Here is a snippet of: /usr/lib [...] -rw-r--r-- 1 root root 14568 Jan 2 2012 libboost_system.so.1.46.1 -rw-r--r-- 1 root root 14568 Jan 5 2012 libboost_system.so.1.48.0

You seem to be missing libboost_system.so library or symlink named libboost_system.so with one of the two as a target. It may look the installation is broken.

...

When I followed your instructions to install it (again), I couldn't. Here is the transcript from the Terminal. Go Bears >sudo apt-get install libboost-system-dev [sudo] password for arvind: Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation:

The following packages have unmet dependencies: libboost-system-dev : Depends: libboost-system1.46-dev but it is not going to be installed E: Unable to correct problems, you have held broken packages.

Clearly, something is broken with installation of boost packages in your system. You should seek for help from Ubuntu folks, it's unrelated to Boost.