g++ can't find header files for libeigen

[Pavlo]

libeigen3-dev.

Header files invisible for g++. Problem can be fixed manually but it is not normal, for me. Since all variable in namespace it would be very nice to have those file in the g++ search path.

Description: Ubuntu 12.04 LTS
Release: 12.04

3.2.0-24-generic #38-Ubuntu SMP Tue May 1 16:18:50 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
ii libeigen3-dev 3.0.5-1 lightweight C++ template library for linear algebra
ii libeigen3-doc 3.0.5-1 eigen3 API documentation
ii g++ 4:4.6.3-1ubuntu5 GNU C++ compiler
ii g++-4.5 4.5.3-12ubuntu2 GNU C++ compiler
ii g++-4.6 4.6.3-1ubuntu5 GNU C++ compiler

[Pavlo (pavlo-solntsev)]

I forgot to show you file i tried to compile:

#include <Eigen/Core>
#include <Eigen/LU>

using namespace Eigen;

int main(int argc, char *argv[])
{
......
}

[Julian Taylor (jtaylor)]

g++ main.cpp `pkg-config --cflags eigen3` works fine here

[Anton Gladky (gladky-anton)]

I would prefer to keep header-files in /usr/include/eigen3 as it is.

We have also eigen2, which will definitely conflict with eigen3, if
header-files from both packages will be placed into /usr/include.

Also eigen has an "unsupported" folder which will be confusing, if we
put it directly into /usr/include

Anton

[Pavlo (pavlo-solntsev)]

I didn't know trick with pkg-config. There is no info about that. It does work. Bug can be closed. We just probably need to add info about pkg-config somewhere to clarify this situation. Thank you.

PS.

[Julian Taylor (jtaylor)]

yes that information should be placed in README.Debian

[Julian Taylor (jtaylor)]

/usr/share/doc/libeigen3-dev/README.Debian that is
that is the normal place to put debian package specific information.

[Anton Gladky (gladky-anton)]

Strange, Launchpad does not send not all messages of this bug per email...

Pavlo, I think the following line should also compile your code:

g++ -I/usr/include/eigen3 main.cpp

[Pavlo (pavlo-solntsev)]

2Anton.

It does. As i said it is not normal way. pkg-config works perfect and it is solution. Bug is closed.