使用Fortran编译和链接C ++ [英] Compile and Link C++ with Fortran

问题描述

我正在尝试使用 gfortran 编译器来编译有效的Fortran 77文件.我使用以下命令来编译Fortran:

I am trying to compile a valid Fortran 77 file using the gfortran compiler. I use the following command to compile the Fortran:

gfortran -c main.f -o main-fortran.o -llapack -lblas

我还需要将此链接与已编译的C ++程序链接，如下所示:

I also need to link this with a C++ program, which is compiled, like so:

g++ -c main.cpp -o main-cpp.o

这两个文件都可以编译，没有任何错误或警告.

Both of these files compile without any errors or warnings.

但是，我无法将它们链接到一个可执行文件中.这是我正在使用的命令:

However, I cannot link them together into an executable. Here is the command I am using:

g++ main-cpp.o main-fortran.o -o run.exe -lgfortran -llapack -lblas

链接器然后给出此错误:

The linker then gives this error:

main-fortran.o: In function `main':
main.f:(.text+0x2e18): multiple definition of `main'
main-cpp.o:main.cpp:(.text+0x8e9): first defined here
collect2: ld returned 1 exit status

您可以在以下位置找到源文件: C ++ 和 Fortran 77 .

You can find the source files here: C++ and Fortran 77.

有什么办法可以克服这个问题吗?

Any idea what I can do to overcome this?

推荐答案

您有两个主要程序:一个在C ++中，一个在Fortran中.通过以下方式删除Fortran之一

You have two main programs: one in C++ and one in Fortran. Delete the Fortran one either by

选项1:Fortran程序的第一位应该是BLOCK DATA段.只需添加

Option 1: The first bit of your Fortran program should be a BLOCK DATA segment. Just add

BLOCK DATA INFO

在一开始.

选项2:删除所有内容，直到第一个END.

Option 2: Delete everything up to the first END.

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