ubunutu eigen3包的查找

find_package查找不到eigen3

Could not find apackage configuration file provided by "Eigen3" with any
of the followingnames:
Eigen3Config.cmake
eigen3-config.cmake
Add theinstallation prefix of "Eigen3" to CMAKE_PREFIX_PATH or set
"Eigen3_DIR"to a directory containing one of the above files. If "Eigen3"

解决方法

将FindEigen3.cmake文件放置到源代码文件夹下的CMakeModules文件夹内即可

set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/CMakeModules)

 FindEigen3.cmake可在eigen/cmake文件夹里面查到

# - Try to find Eigen3 lib

#

# This module supports requiring a minimum version, e.g. you can do

#   find_package(Eigen3 3.1.2)

# to require version 3.1.2 or newer of Eigen3.

#

# Once done this will define

#

#  EIGEN3_FOUND - system has eigen lib with correct version

#  EIGEN3_INCLUDE_DIR - the eigen include directory

#  EIGEN3_VERSION - eigen version

#

# and the following imported target:

#

#  Eigen3::Eigen - The header-only Eigen library

#

# This module reads hints about search locations from 

# the following environment variables:

#

# EIGEN3_ROOT

# EIGEN3_ROOT_DIR



# Copyright (c) 2006, 2007 Montel Laurent, <montel@kde.org>

# Copyright (c) 2008, 2009 Gael Guennebaud, <g.gael@free.fr>

# Copyright (c) 2009 Benoit Jacob <jacob.benoit.1@gmail.com>

# Redistribution and use is allowed according to the terms of the 2-clause BSD license.



if(NOT Eigen3_FIND_VERSION)

  if(NOT Eigen3_FIND_VERSION_MAJOR)

    set(Eigen3_FIND_VERSION_MAJOR 2)

  endif()

  if(NOT Eigen3_FIND_VERSION_MINOR)

    set(Eigen3_FIND_VERSION_MINOR 91)

  endif()

  if(NOT Eigen3_FIND_VERSION_PATCH)

    set(Eigen3_FIND_VERSION_PATCH 0)

  endif()



  set(Eigen3_FIND_VERSION "${Eigen3_FIND_VERSION_MAJOR}.${Eigen3_FIND_VERSION_MINOR}.${Eigen3_FIND_VERSION_PATCH}")

endif()



macro(_eigen3_check_version)

  file(READ "${EIGEN3_INCLUDE_DIR}/Eigen/src/Core/util/Macros.h" _eigen3_version_header)



  string(REGEX MATCH "define[ 	]+EIGEN_WORLD_VERSION[ 	]+([0-9]+)" _eigen3_world_version_match "${_eigen3_version_header}")

  set(EIGEN3_WORLD_VERSION "${CMAKE_MATCH_1}")

  string(REGEX MATCH "define[ 	]+EIGEN_MAJOR_VERSION[ 	]+([0-9]+)" _eigen3_major_version_match "${_eigen3_version_header}")

  set(EIGEN3_MAJOR_VERSION "${CMAKE_MATCH_1}")

  string(REGEX MATCH "define[ 	]+EIGEN_MINOR_VERSION[ 	]+([0-9]+)" _eigen3_minor_version_match "${_eigen3_version_header}")

  set(EIGEN3_MINOR_VERSION "${CMAKE_MATCH_1}")



  set(EIGEN3_VERSION ${EIGEN3_WORLD_VERSION}.${EIGEN3_MAJOR_VERSION}.${EIGEN3_MINOR_VERSION})

  if(${EIGEN3_VERSION} VERSION_LESS ${Eigen3_FIND_VERSION})

    set(EIGEN3_VERSION_OK FALSE)

  else()

    set(EIGEN3_VERSION_OK TRUE)

  endif()



  if(NOT EIGEN3_VERSION_OK)



    message(STATUS "Eigen3 version ${EIGEN3_VERSION} found in ${EIGEN3_INCLUDE_DIR}, "

                   "but at least version ${Eigen3_FIND_VERSION} is required")

  endif()

endmacro()



if (EIGEN3_INCLUDE_DIR)



  # in cache already

  _eigen3_check_version()

  set(EIGEN3_FOUND ${EIGEN3_VERSION_OK})

  set(Eigen3_FOUND ${EIGEN3_VERSION_OK})



else ()

  

  # search first if an Eigen3Config.cmake is available in the system,

  # if successful this would set EIGEN3_INCLUDE_DIR and the rest of

  # the script will work as usual

  find_package(Eigen3 ${Eigen3_FIND_VERSION} NO_MODULE QUIET)



  if(NOT EIGEN3_INCLUDE_DIR)

    find_path(EIGEN3_INCLUDE_DIR NAMES signature_of_eigen3_matrix_library

        HINTS

        ENV EIGEN3_ROOT 

        ENV EIGEN3_ROOT_DIR

        PATHS

        ${CMAKE_INSTALL_PREFIX}/include

        ${KDE4_INCLUDE_DIR}

        PATH_SUFFIXES eigen3 eigen

      )

  endif()



  if(EIGEN3_INCLUDE_DIR)

    _eigen3_check_version()

  endif()



  include(FindPackageHandleStandardArgs)

  find_package_handle_standard_args(Eigen3 DEFAULT_MSG EIGEN3_INCLUDE_DIR EIGEN3_VERSION_OK)



  mark_as_advanced(EIGEN3_INCLUDE_DIR)



endif()



if(EIGEN3_FOUND AND NOT TARGET Eigen3::Eigen)

  add_library(Eigen3::Eigen INTERFACE IMPORTED)

  set_target_properties(Eigen3::Eigen PROPERTIES

    INTERFACE_INCLUDE_DIRECTORIES "${EIGEN3_INCLUDE_DIR}")

endif()