[英]Compile and Link C++ with Fortran
I am trying to compile a valid Fortran 77 file using the gfortran
compiler. 我正在尝试使用
gfortran
编译器编译有效的Fortran 77文件。 I use the following command to compile the Fortran: 我使用以下命令来编译Fortran:
gfortran -c main.f -o main-fortran.o -llapack -lblas
I also need to link this with a C++ program, which is compiled, like so: 我还需要将此链接与已编译的C ++程序进行链接,如下所示:
g++ -c main.cpp -o main-cpp.o
Both of these files compile without any errors or warnings. 这两个文件编译时都没有任何错误或警告。
However, I cannot link them together into an executable. 但是,我无法将它们链接在一起成为可执行文件。 Here is the command I am using:
这是我正在使用的命令:
g++ main-cpp.o main-fortran.o -o run.exe -lgfortran -llapack -lblas
The linker then gives this error: 链接器然后给出此错误:
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
You can find the source files here: C++ and Fortran 77 . 您可以在此处找到源文件: C ++和Fortran 77 。
Any idea what I can do to overcome this? 知道我能做些什么来克服这个问题吗?
You have two main programs: one in C++ and one in Fortran. 您有两个主要程序:一个在C ++中,一个在Fortran中。 Delete the Fortran one either by
删除Fortran之一
Option 1: The first bit of your Fortran program should be a BLOCK DATA segment. 选项1:Fortran程序的第一位应该是BLOCK DATA段。 Just add
只需添加
BLOCK DATA INFO
At the start. 在开始时。
Option 2: Delete everything up to the first END. 选项2:删除所有内容,直到第一个END。
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