Eigen doesn't include correctly outside GTSAM project

[Jing Dong]

When we compile any project using GTSAM Vector, it has the error

/usr/local/include/gtsam/base/Vector.h:29:22: fatal error: Eigen/Core: No such file or directory
 #include <Eigen/Core>

Since system Eigen path is in <eigen3/Eigen/Core>, or use GTSAM embedded Eigen path in <gtsam/3rdparty/Eigen/Core>

This issue only happens outside GTSAM project so unit test cannot detect this.

Any idea? Change it back to <gtsam/3rdparty/Eigen/Core>?

[Chris Beall]

See pull request #132

[Chris Beall]

Merged in fix/EigenIncludeDependentProject (pull request #132)

Eigen include path for dependent projects

Fixes issue #228

→ <<cset 0a0d2a29f677>>

[Ignacio Vizzo]

This is not working again.

I tried a fresh install from scratch and it didn't work. I get this error if I try to compile outside GTSAM project.

/usr/local/include/gtsam/base/OptionalJacobian.h:22:10: fatal error: Eigen/Dense: No such file or directory
 #include <Eigen/Dense>

I'm invoking the compiler in this way :

$ g++-7 -std=c++0x -Wfatal-errors -O0 -g3 -c -fmessage-length=0 -MMD -MP -MF"gtsam_adaptor_test.d" -MT"gtsam_adaptor_test.o" -o "gtsam_adaptor_test.o" "../gtsam_adaptor_test.cpp"

I can fix this doing (adding -I /usr/local/include/gtsam/3rdparty/Eigen/):

g++-7 -std=c++0x -I /usr/local/include/gtsam/3rdparty/Eigen/ -Wfatal-errors -O0 -g3 -c -fmessage-length=0 -MMD -MP -MF"gtsam_adaptor_test.d" -MT"gtsam_adaptor_test.o" -o "gtsam_adaptor_test.o" "../gtsam_adaptor_test.cpp"

But I didn't need to do this in previous versions of gtsam. I tried to fix this, but I'm not used to the build system.

It seems to be a very simple issue, we are not appending to the compiler path the directory where is Eigen.