I attempted to use the libperl++ library to embed Perl in C++. The procedure I followed and the problems I faced are listed below:

1. Installation
I downloaded the library from following location
http://www.vulpes.com/libperl++-1.1.tar.gz

Then unzipped it as

tar -xzvf libperl++-1.1.tar.gz

This produces a folder libperl++1.1.

Then, as instructed in the README file, i installed the library as

$perl Makefile.pl
$make
$make test
$make install

The library is now installed in the following location:
/usr/lib/perl5/site_perl/5.8.5/i386-linux-thread-multi/ExtUtils/libperl++/gnu

Following files are installed:
1. libperl++ header and class files
2. libperl++.so.1.1
3. libperl++.a
4. libperl++.so

2. Library Test
Then i wrote a simple program as instructed in a tutorial here:
http://www.perl.org/tpc/1998/User_Ap...ugh/paper.html

#include <perl++.hh>

wPerlScalar r = 0;
for (int i = 0; i < 100; ++i)
{
r = r + i;
}

I tried to compile this program as:
$ g++ test.cpp -o test
-I /usr/lib/perl5/site_perl/5.8.5/i386-linux-thread-multi/ExtUtils/libperl++/gnu
-L /usr/lib/perl5/site_perl/5.8.5/i386-linux-thread-multi/ExtUtils/libperl++/gnu
/usr/lib/perl5/site_perl/5.8.5/i386-linux-thread-multi/ExtUtils/libperl++/gnu/libperl++.a
-lperl -lm

I tried to compile both including and excluding the libperl++.a library. But all these times, i got the following error message

/tmp/cc85zT3J.o(.text+0x27): In function `main':
: undefined reference to `wPerlScalar::wPerlScalar(int)'
/tmp/cc85zT3J.o(.text+0x46): In function `main':
: undefined reference to `wPerlScalar:perator+=(int)'
/tmp/cc85zT3J.o(.text+0x62): In function `main':
: undefined reference to `wPerlScalar::~wPerlScalar()'
/tmp/cc85zT3J.o(.text+0x7f): In function `main':
: undefined reference to `wPerlScalar::~wPerlScalar()'
collect2: ld returned 1 exit status

This is all I have done so far and here I am stuck with this error. I would appreciate it very much if someone helped me get out of this. Thanks.

If you don't get a reply soon here, try the Perl gurus at perlmonks.org. Some of the guys who write Perl itself hang out there.

Thanks for sharing, Chris.

I managed to compile and link my C++ program with the libperl++ library. I declared a variable wPerlScalar which is supported by the library. However, my requirement is that I need to embed Perl Script in C++ application and this library has a class called wPerl which has eval() function that allows to run Perl script. However, the wPerl class constructor has been declared as protected, which means I cannot instantiate the wPerl class. I tried to make the constructor public and built the library again, but it didn't help, Segmentation error. Can any one help me with this ?

I have been trying to embed perl with c++ for one of my projects.
There I followed the instructions given in this thread (libperl++)

$perl Makefile.pl - works fine
$make - doesn't work, it gives errors as follows.

make[1]: Entering directory `/home/kumudu/wingPerf/perl/libperl++-1.1/libperl++'
make[2]: Entering directory `/home/kumudu/wingPerf/perl/libperl++-1.1/libperl++/NamedConfig'
Manifying ../../blib/man3/ExtUtils::Libperlxx::NamedConfig.3pm
make[2]: Leaving directory `/home/kumudu/wingPerf/perl/libperl++-1.1/libperl++/NamedConfig'
make[2]: Entering directory `/home/kumudu/wingPerf/perl/libperl++-1.1/libperl++/Default'
Manifying ../../blib/man3/ExtUtils::Libperlxx:efault.3pm
make[2]: Leaving directory `/home/kumudu/wingPerf/perl/libperl++-1.1/libperl++/Default'
make[2]: Entering directory `/home/kumudu/wingPerf/perl/libperl++-1.1/libperl++/static'
g++ -Wall -g -DHAS_BOOL -I../source -I/usr/lib/perl/5.10/CORE -c -o interp.o ../source/interp.cc
In file included from ../source/perl++/interp.hh:5,
from ../source/interp.cc:7:
../source/perl++/scalar.hh:88: error: ‘wPerlArray’ has not been declared
../source/perl++/scalar.hh:89: error: ‘wPerlArray’ has not been declared
../source/perl++/scalar.hh:90: error: ‘wPerlArray’ has not been declared
../source/perl++/scalar.hh:91: error: ‘wPerlArray’ has not been declared
../source/perl++/scalar.hh:107: error: ‘wPerlArray’ has not been declared
../source/interp.cc: In function ‘void libperl_xs_init(PerlInterpreter*)’:
../source/interp.cc:13: warning: deprecated conversion from string constant to ‘char*’
../source/interp.cc: In static member function ‘static wPerl* wPerl::start()’:
../source/interp.cc:216: warning: deprecated conversion from string constant to ‘char*’
../source/interp.cc:216: warning: deprecated conversion from string constant to ‘char*’
make[2]: *** [interp.o] Error 1
make[2]: Leaving directory `/home/kumudu/wingPerf/perl/libperl++-1.1/libperl++/static'
make[1]: *** [subdirs] Error 2
make[1]: Leaving directory `/home/kumudu/wingPerf/perl/libperl++-1.1/libperl++'
make: *** [subdirs] Error 2



can someone help me on this.?

hello kumuduharshani,
i have exactly the same issue.
did you resolve it?
thank you very much,
charlotte

edit -- ok i have installed libboost-dev and it works =)