c - 使用 FANN 的链接错误

Question

我正在尝试使用 MinGW 在 Windows 上构建一个基本的 FANN(快速人工神经网络)项目。然而，每当我尝试链接可执行文件时，我都会遇到一堆 undefined reference 错误。有趣的是，如果我根本不链接该库，我会收到更多错误，这意味着该库至少有一部分正在工作。我尝试编译和链接的文件的代码是:

#include "doublefann.h"

int main() {
    const unsigned int num_input_neurons = 9;
    const unsigned int num_output_neurons = 1;
    const unsigned int num_layers = 3;
    const unsigned int num_hidden_neurons = 9;
    const float desired_error = (const float) 0;
    const unsigned int max_epochs = 500000;
    const unsigned int epochs_between_reports = 1000;

    struct fann *ann = fann_create_standard(num_layers,
                                            num_input_neurons,
                                            num_hidden_neurons,
                                            num_output_neurons);

    fann_set_activation_function_hidden(ann, FANN_SIGMOID_SYMMETRIC);
    fann_set_activation_function_output(ann, FANN_SIGMOID_SYMMETRIC);

    fann_train_on_file(ann,
                       "titanic-training.data",
                       max_epochs,
                       epochs_between_reports,
                       desired_error);

    fann_save(ann, "titanic.net");

    fann_destroy(ann);

    return 0;
}

我用来编译和链接的命令是:

gcc -Wall -Ifann\src\include titanic-train.c -Lfann\bin -lfanndouble -o titanic-train.exe

我返回的错误是:

C:\Users\kunkelwe\AppData\Local\Temp\ccsWQg66.o:titanic-train.c:(.text+0x7f): undefined reference to `fann_set_activation_function_hidden'           
C:\Users\kunkelwe\AppData\Local\Temp\ccsWQg66.o:titanic-train.c:(.text+0x93): undefined reference to `fann_set_activation_function_output'           
C:\Users\kunkelwe\AppData\Local\Temp\ccsWQg66.o:titanic-train.c:(.text+0xbf): undefined reference to `fann_train_on_file'                            
C:\Users\kunkelwe\AppData\Local\Temp\ccsWQg66.o:titanic-train.c:(.text+0xd3): undefined reference to `fann_save'                                     
C:\Users\kunkelwe\AppData\Local\Temp\ccsWQg66.o:titanic-train.c:(.text+0xdf): undefined reference to `fann_destroy'                                  
c:/fragileprograms/mingw-native/bin/../lib/gcc/mingw32/4.8.1/../../../../mingw32/bin/ld.exe: C:\Users\kunkelwe\AppData\Local\Temp\ccsWQg66.o: bad reloc address 0x64 in section `.rdata'                                                                                                                 
c:/fragileprograms/mingw-native/bin/../lib/gcc/mingw32/4.8.1/../../../../mingw32/bin/ld.exe: final link failed: Invalid operation                   
collect2.exe: error: ld returned 1 exit status 

如果我根本不链接库，我会得到:

C:\Users\kunkelwe\AppData\Local\Temp\ccyOO3jL.o:titanic-train.c:(.text+0x67): undefined reference to `fann_create_standard'
C:\Users\kunkelwe\AppData\Local\Temp\ccsWQg66.o:titanic-train.c:(.text+0x7f): undefined reference to `fann_set_activation_function_hidden'           
C:\Users\kunkelwe\AppData\Local\Temp\ccsWQg66.o:titanic-train.c:(.text+0x93): undefined reference to `fann_set_activation_function_output'           
C:\Users\kunkelwe\AppData\Local\Temp\ccsWQg66.o:titanic-train.c:(.text+0xbf): undefined reference to `fann_train_on_file'                            
C:\Users\kunkelwe\AppData\Local\Temp\ccsWQg66.o:titanic-train.c:(.text+0xd3): undefined reference to `fann_save'                                     
C:\Users\kunkelwe\AppData\Local\Temp\ccsWQg66.o:titanic-train.c:(.text+0xdf): undefined reference to `fann_destroy'                                  
c:/fragileprograms/mingw-native/bin/../lib/gcc/mingw32/4.8.1/../../../../mingw32/bin/ld.exe: C:\Users\kunkelwe\AppData\Local\Temp\ccsWQg66.o: bad reloc address 0x64 in section `.rdata'                                                                                                                 
c:/fragileprograms/mingw-native/bin/../lib/gcc/mingw32/4.8.1/../../../../mingw32/bin/ld.exe: final link failed: Invalid operation                   
collect2.exe: error: ld returned 1 exit status

编辑:

根据 Haroogan 的要求，我运行了 nm fanndouble.lib。输出相当广泛，因此我没有将其全部粘贴到此处，而是通过此处的 Pastebin 提供了它:http://pastebin.com/raw.php?i=vybFhEcX

我不熟悉 nm，但文件中似乎确实存在缺失的符号。

编辑#2:

doublefann.h的内容为:http://pastebin.com/mrHKJi8C

以及 fann.h 的内容，其中包括:http://pastebin.com/gTrHCYAg

用MinGW重新编译库可以解决这个问题吗？

编辑＃3:

哈罗根建议的改变奏效了!除了这些更改之外，我还必须通过添加以下内容来修改 FANN 的 CMakeLists.txt 文件:

if (WIN32)
ADD_DEFINITIONS(-DFANN_DLL_EXPORTS)
endif (WIN32)

然后，在项目根目录中运行 cmake -G "MinGW Makefiles" 和 mingw32-make 生成一个文件 libdoublefann.dll，当链接到该文件时并包含在 .exe 目录中，终于允许我运行我的程序。

Answer 1

在doublefann.h中的第#116行:

#if (_MSC_VER > 1300)

更改为:

#if (_MSC_VER > 1300) || defined(__MINGW32__) || defined(__MINGW64__)

此外，第 121 行:

#if defined(_MSC_VER) && (defined(FANN_USE_DLL) || defined(FANN_DLL_EXPORTS))

更改为:

#if (defined(_MSC_VER) || defined(__MINGW32__) || defined(__MINGW64__)) && \
    (defined(FANN_USE_DLL) || defined(FANN_DLL_EXPORTS))