ceres-solver&eigen fatal error: Eigen/Core: No such file or directory #include ＜Eigen/Core＞ // For

本文链接：https://blog.youkuaiyun.com/weixin_43731435/article/details/117033816

make报错：

~/slam/ceres-solver/build$ make 
[ 50%] Building CXX object CMakeFiles/learn1.dir/learn1.cpp.o
In file included from /usr/local/include/ceres/internal/array_selector.h:38:0,
                 from /usr/local/include/ceres/internal/autodiff.h:148,
                 from /usr/local/include/ceres/autodiff_cost_function.h:130,
                 from /usr/local/include/ceres/ceres.h:37,
                 from /home/tonglu/slam/ceres-solver/learn1.cpp:2:
/usr/local/include/ceres/internal/fixed_array.h:33:10: fatal error: Eigen/Core: No such file or directory
 #include <Eigen/Core>  // For Eigen::aligned_allocator
          ^~~~~~~~~~~~
compilation terminated.
CMakeFiles/learn1.dir/build.make:62: recipe for target 'CMakeFiles/learn1.dir/learn1.cpp.o' failed
make[2]: *** [CMakeFiles/learn1.dir/learn1.cpp.o] Error 1
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/learn1.dir/all' failed
make[1]: *** [CMakeFiles/learn1.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2
tonglu@tonglu:~/slam/ceres-solver/build$ make 
-- Configuring done
-- Generating done
-- Build files have been written to: /home/tonglu/slam/ceres-solver/build
[ 50%] Building CXX object CMakeFiles/learn1.dir/learn1.cpp.o
In file included from /usr/local/include/ceres/internal/array_selector.h:38:0,
                 from /usr/local/include/ceres/internal/autodiff.h:148,
                 from /usr/local/include/ceres/autodiff_cost_function.h:130,
                 from /usr/local/include/ceres/ceres.h:37,
                 from /home/tonglu/slam/ceres-solver/learn1.cpp:2:
/usr/local/include/ceres/internal/fixed_array.h:33:10: fatal error: Eigen/Core: No such file or directory
 #include <Eigen/Core>  // For Eigen::aligned_allocator
          ^~~~~~~~~~~~
compilation terminated.
CMakeFiles/learn1.dir/build.make:62: recipe for target 'CMakeFiles/learn1.dir/learn1.cpp.o' failed
make[2]: *** [CMakeFiles/learn1.dir/learn1.cpp.o] Error 1
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/learn1.dir/all' failed
make[1]: *** [CMakeFiles/learn1.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2

确认已经安装了eigen3和ceres，找不到eigen3报错。

解决 fatal error: Eigen/Core: No such file or directory

当调用 eigen 库时，会报错：fatal error: Eigen/Core: No such file or directory

这是因为 eigen 库默认安装在了 /usr/include/eigen3/Eigen 路径下，需使用下面命令映射到 /usr/include 路径下

sudo ln -s /usr/include/eigen3/Eigen /usr/include/Eigen

解决