私は、このような小さな例作られたUbuntuの

Question

下Eigen3でCholmodSupportを使用する方法：

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に

#include "solver.h" 

int main() 
{ 
    return 0; 
} 

メイクファイル

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 

"make t1"を実行すると、すべて正常です。私は「T2を作る」と入力するとき ただし、再定義エラーがあります

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 

理由が「CholmodSupport.h」で「長い」タイプの特殊なテンプレート関数であるようです。この問題を解決するにはどんなアイデアですか？

Answer 1

私はちょうどここに固定固有のdevelの枝でCholmodSupportに問題がありました： https://bitbucket.org/eigen/eigen/commits/5ecddbf9fae7f5a4d4e587b8809d9287306885d3

問題は（内部cholmod-の機能を適切に委譲するために使用される）、いくつかのヘルパー関数がなかったということでしたが、 inlineとマークされ、異なるコンパイル単位でコンパイルされたときに複数の定義を持っていました。

Eigen 3.3とEigen 3.2の場合、最小限の例でうまくいくはずです。