使用gcc链接fortran和c ++二进制文件 [英] Linking fortran and c++ binaries using gcc

问题描述

我可以使用gcc分别通过g ++或gfortran在c和c ++之间或c和fortran之间进行调用。但是如果我尝试在c ++和fortran之间进行过程调用，则在使用g ++或gfortran编译时会遇到错误，因为它们不知道其他所需的库。如何链接使用在c ++和fortran中编写的源代码的项目？

I can use gcc to make calls between c and c++ or between c and fortran by using g++ or gfortran, respectively. But if I try to make procedure calls between c++ and fortran I get errors when compiling with either g++ or gfortran because neither knows about the other's required libraries. How can I link a project that uses source code written in both c++ and fortran?

$ cat print_hi.f90
subroutine print_hi() bind(C)
  implicit none
  write(*,*) "Hello from Fortran."
end subroutine print_hi

$ cat main.cpp
#include <iostream>

extern "C" void print_hi(void);

using namespace std;

int main() {
  print_hi();
  cout << "Hello from C++" << endl;
  return 0;
}
$ gfortran -c print_hi.f90 -o print_hi.o
$ g++ -c main.cpp -o main.o

我尝试与g ++连接：

I try linking with g++:

$ g++ main.o print_hi.o -o main
print_hi.o: In function `print_hi':
print_hi.f90:(.text+0x3f): undefined reference to `_gfortran_st_write'

以及关于未定义引用的其他错误。

and further errors regarding undefined references.

与gfortran：

$ gfortran main.o print_hi.o -o main
main.o: In function `main':
main.cpp:(.text+0xf): undefined reference to `std::cout'

。

如何使用gfortran和g ++库将二进制文件链接在一起？

How can I link binaries using the gfortran and g++ libraries together?

推荐答案

您正在寻找
g ++ main.o print_hi.o -o main -lgfortran 链接到标准Fortran库。

You're looking for g++ main.o print_hi.o -o main -lgfortran to link in the standard Fortran libraries.

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