[英]Why doesn't g++ link with the dynamic library I create?
I've been trying to make some applications which all rely on the same library, and dynamic libraries were my first thought: So I began writing the "Library": 我一直在尝试制作一些都依赖于同一个库的应用程序,动态库是我的第一个想法:所以我开始编写“库”:
/* ThinFS.h */
class FileSystem {
public:
static void create_container(string file_name); //Creates a new container
};
/* ThinFS.cpp */
#include "ThinFS.h"
void FileSystem::create_container(string file_name) {
cout<<"Seems like I am going to create a new file called "<<file_name.c_str()<<endl;
}
I then compile the "Library" 我然后编译“图书馆”
g++ -shared -fPIC FileSystem.cpp -o ThinFS.o
I then quickly wrote a file that uses the Library: 然后我迅速写了一个使用Library的文件:
#include "ThinFS.h"
int main() {
FileSystem::create_container("foo");
return (42);
}
I then tried to compile that with 然后我尝试用它编译
g++ main.cpp -L. -lThinFS
But it won't compile with the following error: 但它不会编译时出现以下错误:
/usr/bin/ld: cannot find -lThinFS
collect2: ld returned 1 exit status
I think I'm missing something very obvious, please help me :) 我想我错过了一些非常明显的东西,请帮帮我:)
-lfoo
在当前库路径中查找名为libfoo.a
(static)或libfoo.so
(shared)的库,因此要创建库,需要使用g++ -shared -fPIC FileSystem.cpp -o libThinFS.so
You can use 您可以使用
g++ main.cpp -L. -l:ThinFS
The use of "colon" will use the library name as it is, rather requiring a prefix of "lib" 使用“冒号”将原样使用库名称,而不需要前缀“lib”
the name of the output file should be libThinFS.so , eg 输出文件的名称应该是libThinFS.so ,例如
g++ -shared -fPIC FileSystem.cpp -olibThinFS.
so
The result of g++ -shared -fPIC FileSystem.cpp
is not an object file, so it should not end with .o
. g++ -shared -fPIC FileSystem.cpp
的结果不是目标文件,因此它不应该以.o
结尾。 Also, shared libraries should be named libXXX.so
. 此外,共享库应命名为
libXXX.so
。 Rename the library and it will work. 重命名库,它将工作。
Check out this article. 看看这篇文章。
http://www.yolinux.com/TUTORIALS/LibraryArchives-StaticAndDynamic.html http://www.yolinux.com/TUTORIALS/LibraryArchives-StaticAndDynamic.html
A good resource on how to build different types of libraries. 关于如何构建不同类型库的良好资源。 It also describes how and where to use them.
它还描述了如何以及在何处使用它们。
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