1、安装其实很简单,由于Eigen只是用到其头文件,故安装Eigen只需把解压后文件移动至系统目录下即可:
sudo cp -r /home/bruce/software/eigen_333 /usr/local/include
以上命令把eigen3.3.3移动至/usr/local/include目录下,可以理解为安装成功。
2、如果按此方法安装了多个版本,时间一长可能会记不清某个文件夹是哪个Eigen版本,可通过如下命令进行查看:
cat /usr/local/include/eigen_333/Eigen/src/Core/util/Macros.h | grep VERSION
输出结果如下:
#define EIGEN_WORLD_VERSION 3
#define EIGEN_MAJOR_VERSION 3
#define EIGEN_MINOR_VERSION 3
#define EIGEN_VERSION_AT_LEAST(x,y,z) (EIGEN_WORLD_VERSION>x || (EIGEN_WORLD_VERSION>=x && \
(EIGEN_MAJOR_VERSION>y || (EIGEN_MAJOR_VERSION>=y && \
EIGEN_MINOR_VERSION>=z))))
#if defined(__CC_ARM) || defined(__ARMCC_VERSION)
((defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901)) \
|| (defined(_LIBCPP_VERSION) && !defined(_MSC_VER)))
这就表示是Eigen3.3.3版本。
3、在安装某些包或编译工程文件的时候会遇到一个问题,比如,即使在CMakeLists.txt文件里添加了
set(EIGEN_INCLUDE_DIR "/usr/local/include/eigen_333")
、find_package(Eigen 3.3 REQUIRED)
,但是仍然找不到
所需的Eigen版本,它会自动找到usr/include/eigen3
文件夹下,这就需要修改工程包含的FindEigen.cmake
文件了,作如下修改即可(根据自己的文件夹而定):
if (EIGEN3_FOUND)
set(FOUND_INSTALLED_EIGEN_CMAKE_CONFIGURATION TRUE)
set(EIGEN_FOUND ${EIGEN3_FOUND})
set(EIGEN_INCLUDE_DIR "/usr/local/include/eigen_333" CACHE STRING
"Eigen include directory" FORCE)
else()
一般情况下,就能成功解决,若不成功,尝试把文件中类似的全部改。
有些时候.cmake文件会不一样,但是修改方法大同小异:
macro(EIGEN_REPORT_NOT_FOUND REASON_MSG)
unset(EIGEN_FOUND)
unset(EIGEN_INCLUDE_DIRS)
# Make results of search visible in the CMake GUI if Eigen has not
# been found so that user does not have to toggle to advanced view.
mark_as_advanced(CLEAR EIGEN_INCLUDE_DIR)
# Note <package>_FIND_[REQUIRED/QUIETLY] variables defined by FindPackage()
# use the camelcase library name, not uppercase.
if (Eigen_FIND_QUIETLY)
message(STATUS "Failed to find Eigen - " ${REASON_MSG} ${ARGN})
elseif (Eigen_FIND_REQUIRED)
message(FATAL_ERROR "Failed to find Eigen - " ${REASON_MSG} ${ARGN})
else()
# Neither QUIETLY nor REQUIRED, use no priority which emits a message
# but continues configuration and allows generation.
message("-- Failed to find Eigen - " ${REASON_MSG} ${ARGN})
endif ()
return()
endmacro(EIGEN_REPORT_NOT_FOUND)
# Protect against any alternative find_package scripts for this library having
# been called previously (in a client project) which set EIGEN_FOUND, but not
# the other variables we require / set here which could cause the search logic
# here to fail.
unset(EIGEN_FOUND)
# Search user-installed locations first, so that we prefer user installs
# to system installs where both exist.
list(APPEND EIGEN_CHECK_INCLUDE_DIRS
/usr/local/include
/usr/local/homebrew/include # Mac OS X
/opt/local/var/macports/software # Mac OS X.
/opt/local/include
/usr/include
/usr/local/include/eigen_333)
# Additional suffixes to try appending to each search path.
list(APPEND EIGEN_CHECK_PATH_SUFFIXES
eigen3 # Default root directory for Eigen.
Eigen/include/eigen3 # Windows (for C:/Program Files prefix) < 3.3
Eigen3/include/eigen3
Eigen) # Windows (for C:/Program Files prefix) >= 3.3
# Search supplied hint directories first if supplied.
find_path(EIGEN_INCLUDE_DIR
NAMES Eigen/Core
#PATHS ${EIGEN_INCLUDE_DIR_HINTS}
PATHS $"/usr/local/include/eigen_333"
${EIGEN_CHECK_INCLUDE_DIRS}
PATH_SUFFIXES ${EIGEN_CHECK_PATH_SUFFIXES})
if (NOT EIGEN_INCLUDE_DIR OR
NOT EXISTS ${EIGEN_INCLUDE_DIR})
eigen_report_not_found(
"Could not find eigen3 include directory, set EIGEN_INCLUDE_DIR to "
"path to eigen3 include directory, e.g. /usr/local/include/eigen_333")
endif (NOT EIGEN_INCLUDE_DIR OR
NOT EXISTS ${EIGEN_INCLUDE_DIR})
# Mark internally as found, then verify. EIGEN_REPORT_NOT_FOUND() unsets
# if called.
set(EIGEN_FOUND TRUE)
# Extract Eigen version from Eigen/src/Core/util/Macros.h
if (EIGEN_INCLUDE_DIR)
set(EIGEN_VERSION_FILE /usr/local/include/eigen_333/Eigen/src/Core/util/Macros.h)
if (NOT EXISTS ${EIGEN_VERSION_FILE})
eigen_report_not_found(
"Could not find file: ${EIGEN_VERSION_FILE} "
"containing version information in Eigen install located at: "
"${EIGEN_INCLUDE_DIR}.")
else (NOT EXISTS ${EIGEN_VERSION_FILE})
file(READ ${EIGEN_VERSION_FILE} EIGEN_VERSION_FILE_CONTENTS)
string(REGEX MATCH "#define EIGEN_WORLD_VERSION [0-9]+"
EIGEN_WORLD_VERSION "${EIGEN_VERSION_FILE_CONTENTS}")
string(REGEX REPLACE "#define EIGEN_WORLD_VERSION ([0-9]+)" "\\1"
EIGEN_WORLD_VERSION "${EIGEN_WORLD_VERSION}")
string(REGEX MATCH "#define EIGEN_MAJOR_VERSION [0-9]+"
EIGEN_MAJOR_VERSION "${EIGEN_VERSION_FILE_CONTENTS}")
string(REGEX REPLACE "#define EIGEN_MAJOR_VERSION ([0-9]+)" "\\1"
EIGEN_MAJOR_VERSION "${EIGEN_MAJOR_VERSION}")
string(REGEX MATCH "#define EIGEN_MINOR_VERSION [0-9]+"
EIGEN_MINOR_VERSION "${EIGEN_VERSION_FILE_CONTENTS}")
string(REGEX REPLACE "#define EIGEN_MINOR_VERSION ([0-9]+)" "\\1"
EIGEN_MINOR_VERSION "${EIGEN_MINOR_VERSION}")
# This is on a single line s/t CMake does not interpret it as a list of
# elements and insert ';' separators which would result in 3.;2.;0 nonsense.
set(EIGEN_VERSION "${EIGEN_WORLD_VERSION}.${EIGEN_MAJOR_VERSION}.${EIGEN_MINOR_VERSION}")
endif (NOT EXISTS ${EIGEN_VERSION_FILE})
endif (EIGEN_INCLUDE_DIR)
# Set standard CMake FindPackage variables if found.
if (EIGEN_FOUND)
set(EIGEN_INCLUDE_DIRS ${EIGEN_INCLUDE_DIR})
endif (EIGEN_FOUND)
# Handle REQUIRED / QUIET optional arguments and version.
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(Eigen
REQUIRED_VARS EIGEN_INCLUDE_DIRS
VERSION_VAR EIGEN_VERSION)
# Only mark internal variables as advanced if we found Eigen, otherwise
# leave it visible in the standard GUI for the user to set manually.
if (EIGEN_FOUND)
mark_as_advanced(FORCE EIGEN_INCLUDE_DIR)
endif (EIGEN_FOUND)
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