Boost static linking

Question

I am using the Boost library in Linux, GCC. After installing and building the Boost, I found that programs using Regex and Thread use shared Boost libraries. For my purposes, I need static linking. How can I change linking type? Should I rebuild the Boost, or maybe I can set linking type by defining some constant in my own projects or Boost configuration files?

Answer 1

Specify -Lpath/to/library/ to the linker.

Answer 2

Just add -static to your build invocation. Here is a quick example session:

$ cat boost_formatted_time.cpp
#include <iostream>
#include <boost/date_time/posix_time/posix_time.hpp>
#include <boost/date_time/posix_time/posix_time_io.hpp>

using namespace boost::posix_time;
using namespace std;

int main(int argc, char **argv) {
  time_facet *facet = new time_facet("%d-%b-%Y %H:%M:%S");
  cout.imbue(locale(cout.getloc(), facet));
  cout << second_clock::local_time() << endl;
}
$ g++ -o /tmp/bft_dyn boost_formatted_time.cpp -lboost_date_time
$ g++ -static -o /tmp/bft_stc boost_formatted_time.cpp -lboost_date_time
$ ls -lh /tmp/bft_*
-rwxr-xr-x 1 edd edd 216K 2010-02-24 12:34 /tmp/bft_dyn    
-rwxr-xr-x 1 edd edd 1.5M 2010-02-24 12:34 /tmp/bft_stc    
$ /tmp/bft_dyn
24-Feb-2010 12:34:55
$ /tmp/bft_stc
24-Feb-2010 12:34:59
$

Note how the static binary is 1.5mb as opposed to 216kb for the dynamically-linked variant. All done on Debian testing with the default Boost packages.