C ++链接问题，似乎我不能链接到标准的C ++东西 [英] C++ linking problems, seems like I cant link against standard C++ stuff

问题描述

我想使用我在iOS应用程式中编译的图书馆。库是Tesseract OCR库。看起来像编译（和它的依赖）已经确定。

I am trying to use a library I've compiled myself in an iOS app. The library is the Tesseract OCR lib. It seems like compiling that (and its dependencies) have gone ok.

但是，当我尝试在我的应用程序项目中链接到这个库时，应用程序无法链接。链接错误让我惊讶;它似乎有问题的Tesseract东西找到漂亮的标准C ++的东西。

However, when I try to link against this lib in my app project, the app fails to link. The link errors surprise me; it seems like there are problems with the Tesseract stuff finding pretty standard C++ stuff.

关于我可能做错的任何建议将是最有帮助的。

Any suggestions about what I might be doing wrong would be most helpful.

这是我看到的链接错误类型的代码段。

Here is a snippet of the kind of link errors I'm seeing.

Undefined symbols for architecture armv7:
"std::string::find_last_of(char const*, unsigned long) const", referenced from:
  tesseract::WordSizeModel::Init(std::string const&, std::string const&) in    libtesseract.a(word_size_model.o)
"std::string::find_first_of(std::string const&, unsigned long) const", referenced from:
  tesseract::CubeUtils::SplitStringUsing(std::string const&, std::string const&, std::vector<std::string, std::allocator<std::string> >*) in libtesseract.a(cube_utils.o)
"std::string::find_first_not_of(std::string const&, unsigned long) const", referenced from:
  tesseract::CubeUtils::SplitStringUsing(std::string const&, std::string const&, std::vector<std::string, std::allocator<std::string> >*) in libtesseract.a(cube_utils.o)
"std::string::data() const", referenced from:
  tesseract::CubeUtils::SplitStringUsing(std::string const&, std::string const&, std::vector<std::string, std::allocator<std::string> >*) in libtesseract.a(cube_utils.o)
"std::string::find(char, unsigned long) const", referenced from:
  tesseract::TessLangModel::IsLeadingPunc(int) in libtesseract.a(tess_lang_model.o)

推荐答案

谢谢你大家的答案。我发现了我的特定问题，所以会在这里分享它，以防任何人打它。

Thank you everyone for your answers. I found out what my particular problem was, so will share it here in case anybody else hits it.

我的问题是一个项目构建设置。在Apple LLVM Compiler 5.0 - Language - C ++下，有一个C ++标准库的设置。其值需要更改为编译器默认值。

My problem was a project build setting. Under "Apple LLVM Compiler 5.0 - Language - C++" there is a setting for "C++ standard library". Its value needed to be changed to "Compiler Default".

几小时浪费，但问题解决了！

Several hours wasted, but problem solved!

这篇关于C ++链接问题，似乎我不能链接到标准的C ++东西的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！