Re: Compiler Errors

[Kjell Ahlstedt <kjell ahlstedt bredband net>]

2012-05-16 19:19, Santhosh Edukulla skrev:
> Actually iam doing the same i.e., using a makefile and provided the
> additional args as below.
>
> I was under assumption that i have configured something wrong and it
> was not able to detect the relevant includes for compiling.
>
> Any ways, thats ok. I have few other questions though:
>
> 1. We have a libxml lib written in c and are using all these days
> through a wrapper. I found this to be very simple and interesting. If
> we provide this lib as part of our production environment, will there
> be any issues in terms of footprint size for this? Also, any conflicts
> with base libxml packages already there?
Of course the C++ wrappers add some extra overhead, both in execution 
time and memory footprint, but I don't think you need to worry about 
that. The overhead is small. It's the same technique that's used in 
several other packages, e.g. in gtkmm which contains C++ wrappers for 
the C functions in gtk+.
A can't think of any conflicts with libxml (libxml2). libxml++ itself 
depends on it, and calls its functions. If you have other xml libraries 
installed, I suppose name collisions would be possible, but improbable.
> 2. I hope it is open source and available under GPL?
Yes, it's open source. libxml++ and most of the packages it depends on 
are available under LGPL. The exception is the C library libxml2, which 
is available under the MIT license 
(http://www.opensource.org/licenses/mit-license.html).
> Thanks in Advance!
> Santhosh
> On 5/16/12, Kjell Ahlstedt<kjell ahlstedt bredband net>  wrote:
> > 2012-05-16 16:00, Santhosh Edukulla skrev:
> > > Hi All,
> > >
> > > I have installed libxml++ from below link:
> > >
> > > 1/ When i compile my code file using the command below (EX), It works fine
> > > :
> > >
> > > g++  -g res_parser.cpp -o program `pkg-config --cflags --libs
> > > libxml++-2.6`
> > >
> > > 2/ But, when i run like below. It gives tons of errors.
> > > g++  -g res_parser.cpp -o program
> > >
> > > Few of the errors are below:
> > >
> > > /usr/include/libxml++/validators/dtdvalidator.h:24: error: expected
> > > ‘,’ or ‘...’ before ‘::’ token
> > > /usr/include/libxml++/validators/dtdvalidator.h:25: error: expected
> > > ‘,’ or ‘...’ before ‘::’ token
> > > /usr/include/libxml++/validators/dtdvalidator.h:25: error:
> > > ‘xmlpp::DtdValidator::DtdValidator(int)’ cannot be overloaded
> > > /usr/include/libxml++/validators/dtdvalidator.h:24: error: with
> > > ‘xmlpp::DtdValidator::DtdValidator(int)’
> > > /usr/include/libxml++/validators/dtdvalidator.h:28: error: expected
> > > ‘,’ or ‘...’ before ‘::’ token
> > > /usr/include/libxml++/validators/dtdvalidator.h:29: error: expected
> > > ‘,’ or ‘...’ before ‘::’ token
> > > /usr/include/libxml++/validators/dtdvalidator.h:30: error: expected
> > > ‘,’ or ‘...’ before ‘::’ token
> > >
> > > Any idea as to why these errors are?
> > >
> > > Thanks in Advance!
> > > Santhosh
> > These errors (at least the first few, I didn't check all of them) comes
> > from lines where Glib::ustring is mentioned. Some of the libxml++ header
> > files include<glibmm/ustring.h>, and without `pkg-config --cflags
> > --libs libxml++-2.6` g++ can't find that file.
> >
> > What makes you think that you should be able to compile and link without
> > `pkg-config --cflags --libs libxml++-2.6`? Is there any documentation
> > that says so? In that case, it's wrong. Or what's the problem with
> > including `pkg-config --cflags --libs libxml++-2.6` in the g++ command?
> > You can store it in a makefile or a shell script. You don't have to
> > write it every time you compile your program.
> >
> > Kjell