Re: [boost] Problems using Boost, Pls Advise

From: Rene Rivera (grafik.list_at_[hidden])
Date: 2004-04-27 14:32:26

Steve Bobrowski wrote:

> Hi,
> 
> I'm a C++ newbie trying to use the Boost regex libraries. Here's my
> situation.
> 
> My system is Red Hat Linux 9, using the Borland C++BuilderX Personal IDE
> (which uses the g++ compiler).
> 
> I downloaded and installed Boost from boost.org using the command:
> 
> bjam -sTOOLS=gcc install
> 
> The install seemed to complete fine, with 2900+ targets updated.

Good :-)

> The libraries install in /usr/local/include/boost-1_31/boost.
> 
> I created the following link:
> 
> ln -s /usr/local/include/boost-1_31/boost /usr/include/boost

Very reasonable thing to do ;-)

> I then use C++BuilderX to try and compile one of the example programs
> for the regex libaries that I found in the documentation. The source
> code is:

[cut]

> In function `boost::reg_expression<char, boost::regex_traits<char>,
> std::allocator<char> > const&
> boost::re_detail::get_default_expression<char>(char)':
> "perl_matcher_common.hpp":
> /usr/include/boost/regex/v4/perl_matcher_common.hpp undefined reference
> to `boost::reg_expression<char, boost::regex_traits<char>,
> std::allocator<char> >::reg_expression[in-charge](char const*, unsigned,
> std::allocator<char> const&)' at line 734
> linux/Debug_Build/splittest.o(.gnu.linkonce.t._ZN5boost11regex_splitISt20bac
> k_insert_iteratorISt4listISsSaISsEEEcSt11char_traitsIcESaIcENS_12reg
> ex_traitsIcEES8_EEjT_RSbIT0_T1_T2_ERKNS_14reg_expressionISC_T3_T4_EENS_15reg
> ex_constants12_match_flagsEj+0x12e):

That would be a link error.

[cut]

> After searching around extensively, I've not come up with any solution
> to my problem. Can someone please point me in the right direction? It
> seems like I'm just missing some configuration step along the way.

Since Boost.Regex is not a header only library you need to link to the 
built regex library. The install procedure installed a bunch of these 
built libraries in "/usr/local/lib" for you. Look for libboost_regex* 
files. Depending on what your use requirements are you need to pick one 
of them and tell C++BuilderX to link to it. What the various names mean 
is describe in the Getting Started docs.

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