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":
/* 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"
g++ -shared -fPIC FileSystem.cpp -o ThinFS.o
I then quickly wrote a file that uses the Library:
#include "ThinFS.h"
int main() {
FileSystem::create_container("foo");
return (42);
}
I then tried to compile that with
g++ main.cpp -L. -lThinFS
But it won't compile with the following error:
/usr/bin/ld: cannot find -lThinFS
collect2: ld returned 1 exit status
I think I'm missing something very obvious, please help me :)
-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
g++ main.cpp -L. -l:ThinFS
The use of "colon" will use the library name as it is, rather requiring a prefix of "lib"
the name of the output file should be libThinFS.so , eg
g++ -shared -fPIC FileSystem.cpp -o ThinFS.
The result of g++ -shared -fPIC FileSystem.cpp
is not an object file, so it should not end with .o
. Also, shared libraries should be named libXXX.so
. Rename the library and it will work.
Check out this article.
http://www.yolinux.com/TUTORIALS/LibraryArchives-StaticAndDynamic.html
A good resource on how to build different types of libraries. It also describes how and where to use them.
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