Eclipse-CDT/C++：尽管创建了正确的 .o 文件并将其传递给链接器，但未定义的引用错误

发布于 2024-12-18 04:31:10 字数 743 浏览 3 评论 0原文

首先：我没有使用已经编译的库。

情况是这样的：我在 eclipse CDT 中有一个 C++ 项目，其文件夹结构如下：

project
  somefoldername
    src
    include
  library
    src
    include

somefoldername/src 和library/src 被定义为源文件夹，somefoldername/include 以及library/include 被定义为包含文件夹（在 C/C++ 常规 -> 路径和符号下，这也会影响编译器 -I 选项）。

“library”文件夹包含我自己的代码使用的库的源代码（可以在“somefolder”中找到）。嗯，整个项目的编译工作正常，但链接崩溃，库源代码中出现一大堆“未定义的引用”错误。

尽管创建了可以在其中找到缺失函数的 *.o 文件，并且随后也将其传递给链接器，但仍会发生未定义的引用错误。

我做错了什么？

编辑：更新到当前配置并尝试解决问题。

编辑2：接受的答案对我有所帮助，但最大的问题似乎是“立即链接所有内容”策略，然后是日食。我转到 autoconf 并首先构建了库，然后将其链接到主应用程序。虽然这需要更多工作，但这是一种更干净的方法。

原文

At first: I am not using an already compiled library.

Here's the situation: I've got a C++ project in eclipse CDT that has a folder structure like this:

project
  somefoldername
    src
    include
  library
    src
    include

somefoldername/src and library/src are defined as source folders and somefoldername/include as well as library/include are defined as include folders (under C/C++ General->Paths and Symbols, which also affects the compilers -I option).

The "library" folder contains the source code of a library used by my own code (which can be found in "somefolder"). Well, compiling of the whole project works fine, but linking crashes with a whole bunch of "undefined reference" errors in the library's source.

The undefined reference errors occur, although *.o-files are created in which the missing functions should be found - and also are passed to the linker afterwards.

What am I doing wrong?

Edit: Updated to current configuration and the attempts to solve the problem.

Edit2: The accepted answer helped me out a bit, but the biggest problem seemed to be the "linking everything at once"-policy followed by eclipse. I went to autoconf and built the library first, before linking it to the main application. Although it's more work, it's a cleaner approach.

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凹づ凸ル 2024-12-25 04:31:10

三种可能性：

1）“未定义”符号实际上不在您的库中

 This is unlikely, but you can verify using the "nm" Linux command

2）您没有在 Eclipse 中正确设置库搜索路径（“dash-big-L”）

在 eclipse cdt 中链接静态库
...或...
3) 也许您使用“C”链接构建了库，但您的程序正在使用 C++ 链接（反之亦然）。如果您使用的是“C”（gcc）编译器，或者有任何“*.c”源文件，请确保所有函数在您的.h标头中都有原型，并且所有原型都使用“extern“C””酌情：
& http://msdn.microsoft.com/ en-us/library/0603949d%28v=vs.80%29.aspx

Three possibilities:

1) The "undefined" symbols aren't actually in your library

 This is unlikely, but you can verify using the "nm" Linux command

2) You aren't setting the library search path ("dash-big-L") correctly in Eclipse

link static lib in eclipse cdt
... or ...
3) Perhaps you built the library with "C" linkage, but your program is using C++ linkage (or vice versa). If you're using the "C" (gcc") compiler, or have any "*.c" source files, then make sure all functions have prototypes in your .h header, and all prototypes use "extern "C"" as appropriate:
& http://msdn.microsoft.com/en-us/library/0603949d%28v=vs.80%29.aspx

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