gcc链接器和OGDF“未定义对`OGDF：：Initialization：：Initialization()‘的引用”

Question

我正在尝试让OGDF工作，看看它是否适合我的项目，但我在使用示例程序时遇到了问题。

我正在尝试编译this example program

#include <ogdf/basic/Graph.h>
#include <ogdf/basic/graph_generators.h>
#include <ogdf/layered/DfsAcyclicSubgraph.h>

using namespace ogdf;

int main()
{
    Graph G;
    randomSimpleGraph(G, 10, 20);
    DfsAcyclicSubgraph DAS;
    DAS.callAndReverse(G);
    G.writeGML("test.gml");

    return 0;
}

使用以下命令：

$g++ -pthread -I ./OGDF/ -L ./OGDF/_release/ -lOGDF test2.cpp 

但是我得到了以下错误

/tmp/ccbpkfdt.o: In function `main':
test2.cpp:(.text+0x12): undefined reference to `ogdf::Graph::Graph()'
test2.cpp:(.text+0x2e): undefined reference to `ogdf::randomSimpleGraph(ogdf::Graph&, int, int)'
test2.cpp:(.text+0x4e): undefined reference to `ogdf::AcyclicSubgraphModule::callAndReverse(ogdf::Graph&)'
test2.cpp:(.text+0x62): undefined reference to `ogdf::Graph::writeGML(char const*) const'
test2.cpp:(.text+0x7f): undefined reference to `ogdf::Graph::~Graph()'
test2.cpp:(.text+0xa1): undefined reference to `ogdf::Graph::~Graph()'
/tmp/ccbpkfdt.o: In function `__static_initialization_and_destruction_0(int, int)':
test2.cpp:(.text+0xfb): undefined reference to `ogdf::Initialization::Initialization()'
test2.cpp:(.text+0x112): undefined reference to `ogdf::Initialization::~Initialization()'
/tmp/ccbpkfdt.o: In function `ogdf::DfsAcyclicSubgraph::DfsAcyclicSubgraph()':
test2.cpp:(.text._ZN4ogdf18DfsAcyclicSubgraphC2Ev[_ZN4ogdf18DfsAcyclicSubgraphC5Ev]+0x16): undefined reference to `vtable for ogdf::DfsAcyclicSubgraph'
/tmp/ccbpkfdt.o: In function `ogdf::DfsAcyclicSubgraph::~DfsAcyclicSubgraph()':
test2.cpp:(.text._ZN4ogdf18DfsAcyclicSubgraphD2Ev[_ZN4ogdf18DfsAcyclicSubgraphD5Ev]+0xb): undefined reference to `vtable for ogdf::DfsAcyclicSubgraph'
collect2: error: ld returned 1 exit status

我尝试使用来自OGDF的include编译hello world，但我仍然得到：

undefined reference to `ogdf::Initialization::Initialization()'

我想我的链接不正确还是怎么的？

Answer 1

当你链接到一个库的时候，你必须非常小心你输入内容的顺序。尝试将test2.cpp放在-lOGDF之前，如下所示：

g++ -pthread -I ./OGDF/ -L ./OGDF/_release/ test2.cpp -lOGDF 

Answer 2

当使用-DOGDF_DLL作为共享库时，您必须使用OGDF构建您的程序。

查看此处：http://www.ogdf.net/doku.php/tech:defines