如何在ubuntu下使用eigen3的cholmodsupport

Question

我做了一个很小的示例：

solver.h

#pragma once
#include <Eigen/Dense>
#include <Eigen/Sparse>
#include <Eigen/CholmodSupport>
typedef Eigen::SparseMatrix<double> SpMat;
class UseCholmodSolver
{
    public:
        UseCholmodSolver() {}
        ~UseCholmodSolver() {}
    private:
        Eigen::CholmodSupernodalLLT<SpMat> cholmod;
};

solver.cpp

#include "solver.h"

main.cpp

#include "solver.h"
int main()
{
    return 0;
}

makefile

CXXFLAGS=-g -O2 -Wall -DNDEBUG -I./ext/eigen -I/usr/include/suitesparse
CXX=g++
all: t1
clean:
    rm -f *.o main
main.o: main.cpp solver.h
solver.o: solver.cpp solver.h
t1: main.o
    $(CXX) main.o -o main -lcholmod
t2: main.o solver.o
    $(CXX) main.o solver.o -o main -lcholmod

当我执行" Make T1"时，一切都很好。但是，当我键入" make t2"时，会有重新定义错误：

g++ main.o solver.o -o main -lcholmod
solver.o: In function `int Eigen::internal::cm_start<long>(cholmod_common_struct&)':
/home/xiang/Code/testEigen/./ext/eigen/Eigen/src/CholmodSupport/CholmodSupport.h:177: multiple definition of `int Eigen::internal::cm_start<long>(cholmod_common_struct&)'
main.o:/home/xiang/Code/testEigen/./ext/eigen/Eigen/src/CholmodSupport/CholmodSupport.h:177: first defined here
solver.o: In function `int Eigen::internal::cm_finish<long>(cholmod_common_struct&)':
/home/xiang/Code/testEigen/./ext/eigen/Eigen/src/CholmodSupport/CholmodSupport.h:178: multiple definition of `int Eigen::internal::cm_finish<long>(cholmod_common_struct&)'
main.o:/home/xiang/Code/testEigen/./ext/eigen/Eigen/src/CholmodSupport/CholmodSupport.h:178: first defined here
solver.o: In function `int Eigen::internal::cm_free_factor<long>(cholmod_factor_struct*&, cholmod_common_struct&)':
/home/xiang/Code/testEigen/./ext/eigen/Eigen/src/CholmodSupport/CholmodSupport.h:180: multiple definition of `int Eigen::internal::cm_free_factor<long>(cholmod_factor_struct*&, cholmod_common_struct&)'
main.o:/home/xiang/Code/testEigen/./ext/eigen/Eigen/src/CholmodSupport/CholmodSupport.h:180: first defined here
solver.o: In function `int Eigen::internal::cm_free_dense<long>(cholmod_dense_struct*&, cholmod_common_struct&)':
/home/xiang/Code/testEigen/./ext/eigen/Eigen/src/CholmodSupport/CholmodSupport.h:181: multiple definition of `int Eigen::internal::cm_free_dense<long>(cholmod_dense_struct*&, cholmod_common_struct&)'
main.o:/home/xiang/Code/testEigen/./ext/eigen/Eigen/src/CholmodSupport/CholmodSupport.h:181: first defined here
solver.o: In function `int Eigen::internal::cm_free_sparse<long>(cholmod_sparse_struct*&, cholmod_common_struct&)':
/home/xiang/Code/testEigen/./ext/eigen/Eigen/src/CholmodSupport/CholmodSupport.h:182: multiple definition of `int Eigen::internal::cm_free_sparse<long>(cholmod_sparse_struct*&, cholmod_common_struct&)'
main.o:/home/xiang/Code/testEigen/./ext/eigen/Eigen/src/CholmodSupport/CholmodSupport.h:182: first defined here
solver.o: In function `cholmod_factor_struct* Eigen::internal::cm_analyze<long>(cholmod_sparse_struct&, cholmod_common_struct&)':
/home/xiang/Code/testEigen/./ext/eigen/Eigen/src/CholmodSupport/CholmodSupport.h:184: multiple definition of `cholmod_factor_struct* Eigen::internal::cm_analyze<long>(cholmod_sparse_struct&, cholmod_common_struct&)'
main.o:/home/xiang/Code/testEigen/./ext/eigen/Eigen/src/CholmodSupport/CholmodSupport.h:184: first defined here
solver.o: In function `cholmod_dense_struct* Eigen::internal::cm_solve<long>(int, cholmod_factor_struct&, cholmod_dense_struct&, cholmod_common_struct&)':
/home/xiang/Code/testEigen/./ext/eigen/Eigen/src/CholmodSupport/CholmodSupport.h:187: multiple definition of `cholmod_dense_struct* Eigen::internal::cm_solve<long>(int, cholmod_factor_struct&, cholmod_dense_struct&, cholmod_common_struct&)'
main.o:/home/xiang/Code/testEigen/./ext/eigen/Eigen/src/CholmodSupport/CholmodSupport.h:187: first defined here
solver.o: In function `cholmod_sparse_struct* Eigen::internal::cm_spsolve<long>(int, cholmod_factor_struct&, cholmod_sparse_struct&, cholmod_common_struct&)':
/home/xiang/Code/testEigen/./ext/eigen/Eigen/src/CholmodSupport/CholmodSupport.h:190: multiple definition of `cholmod_sparse_struct* Eigen::internal::cm_spsolve<long>(int, cholmod_factor_struct&, cholmod_sparse_struct&, cholmod_common_struct&)'
main.o:/home/xiang/Code/testEigen/./ext/eigen/Eigen/src/CholmodSupport/CholmodSupport.h:190: first defined here
solver.o: In function `int Eigen::internal::cm_factorize_p<long>(cholmod_sparse_struct*, double*, long*, unsigned long, cholmod_factor_struct*, cholmod_common_struct&)':
/home/xiang/Code/testEigen/./ext/eigen/Eigen/src/CholmodSupport/CholmodSupport.h:195: multiple definition of `int Eigen::internal::cm_factorize_p<long>(cholmod_sparse_struct*, double*, long*, unsigned long, cholmod_factor_struct*, cholmod_common_struct&)'
main.o:/home/xiang/Code/testEigen/./ext/eigen/Eigen/src/CholmodSupport/CholmodSupport.h:195: first defined here
collect2: error: ld returned 1 exit status
Makefile:14: recipe for target 't2' failed
make: *** [t2] Error 1

看来，原因是" Cholmodsupport.h"中的"长"类型专用模板函数。解决此问题的想法吗？

Answer 1

在eigen的开发单元中，cholmodsupport有一个问题，我在这里固定了：https://bitbucket.org/eigen/eigen/commits/5ecddbf9fae7f5a4d4e587b8888888809d92873068885d3

问题在于，某些辅助功能(用于委派给适当的内部霍尔莫德函数(的功能未标记为inline，因此在不同的汇编单元中编译时具有多个定义。

。

对于特征3.3和特征3.2您的最小示例应该可以正常工作。