首先,介绍下Apple
LLVM compiler 4.2 与LLVM GCC的区别:
某些项目采用了一些第三方库,有时候可能会因为编译方式的不同导致无法项目编译通过,目前xcode 最新的默认的Compiler for C/C++/Objective C为apple LLVM compiler 4.2, 但其采用的C++ Standard Library 却为libc++(LLVM C++ standard libraryth C++ 11 support), 有些开源类的第三方库可能会采用 原始的LLVM GCC编译器(c++ 标准库为libstdC++)。而libstdC++
与 libc++(LLVM C++ standard libraryth C++ 11 support) 是有很大区别的,具体的历史渊源可以维基百科等等的查询一下,这里就不详细的讲解了。
解决方式有两种:
1. 选择 apple LLVM compiler 4.2, c++ 标准库改为libstdc++(GNU C++ standard library)
2. 选择LLVM GCC, c++标准库为libstdC++
下面是对应真机的处理器:
armv7 , armv7s对应真机的32位处理器,
arm64对应真机的64位模拟器,
i386对应模拟器的32位模拟器;
x86_64对应模拟器的64位模拟器。
碰到一个类似上述的问题,感觉还是stl的C++库加载造成的问题。
即使通过gcc -v查看了编译过程,
然后用gcc -E 导出了预编译后的文件,
查看到的仍然只是std::string,为什么会出现接口中
有的是fucn(std::string)
有的是func(std::__1::basic_string...)
仍然没有搞清楚,网上有一篇似乎可以处理这个问题的文章,如下:
http://blog.csdn.net/kaizi318/article/details/10362673
但是尝试后,发现xcode仍然报错。
通过在后台用nm查看调用。
发现如果用libstdc++库,则需要使用指定头文件,添加头文件路径如下:
-I $(shell $(XCRUN) --show-sdk-path)/usr/include/c++/4.2.1
其对应使用的std::string类型就是std::string。
而若是不指定用libstdc++,而是使用默认的libc++库,则使用的是默认的C++头文件,
其对应使用的std::string变成了std::__1::basic_string(........)之类的
因此,c++头文件使用的不同导致其他使用stl的库的函数签名和实现都不同了
参考文章如下:
Undefined symbols for architecture i386或者armv7:
“_OBJC_CLASS_$_XXX
Undefined symbols for architecture i386:
“_OBJC_CLASS_$_XXX”, referenced
from:
objc-class-ref in XXX
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)
如果真机调试就是 undefined symbols for architecture armv7错误!
发生这种错误通常是project.pbxproj这个文件引起的,尤其在多人合作开发的时候,svn提交不规范可能导致project.pbxproj发生错误,导致文件的引用不在project.pbxproj文件中。
xcode项目import文件会根据project.pbxproj来查找,查找不到文件的引用则会有上述的错误。
解决方法点击工程,在主界面中点击Build Phases,根据提示信息“XXX”来判断缺少什么文件,一般如果缺少自定义的文件,XXX会是缺少的类名,那么就在Complie Sources中加入该文件。如果缺少类库,则在Link Binary With Libraries中加入该类库。
Undefined
symbols for architecture
i386: |
02 |
"TextureMan::LoadTexture(std::__1::basic_string,
std::__1::allocator > const&, int, bool)" ,
referenced from: |
03 |
tolua_gameinterface_TextureMan_loadTexture00(lua_State*) in libCoreClientiOS.a(tolua_gameinterface.o) |
04 |
"SoundManager::BgndMusicPlay(std::__1::basic_string,
std::__1::allocator > const&, bool)" ,
referenced from: |
05 |
tolua_gameinterface_SoundManager_BgndMusicPlay00(lua_State*) in libCoreClientiOS.a(tolua_gameinterface.o) |
06 |
"SoundManager::BgndMusicStop(std::__1::basic_string,
std::__1::allocator > const&, bool)" ,
referenced from: |
07 |
tolua_gameinterface_SoundManager_BgndMusicStop00(lua_State*) in libCoreClientiOS.a(tolua_gameinterface.o) |
08 |
"Font::LoadFont(std::__1::basic_string,
std::__1::allocator > const&)" ,
referenced from: |
09 |
tolua_gameinterface_Font_loadFont00(lua_State*) in libCoreClientiOS.a(tolua_gameinterface.o) |
10 |
"System::MakeDocumentPath(std::__1::basic_string,
std::__1::allocator > const&) const" ,
referenced from: |
11 |
tolua_gameinterface_System_makeDocumentPath00(lua_State*) in libCoreClientiOS.a(tolua_gameinterface.o) |
12 |
"System::MakeResourcePath(std::__1::basic_string,
std::__1::allocator > const&) const" ,
referenced from: |
13 |
ExUnit::LogicThread::Run() in libCoreClientiOS.a(logicthread.o) |
14 |
tolua_gameinterface_System_makeResourcePath00(lua_State*) in libCoreClientiOS.a(tolua_gameinterface.o) |
15 |
"std::__1::__vector_base_common::__throw_length_error()
const" ,
referenced from: |
16 |
void
std::__1::vector >::__push_back_slow_path(float const&&&) in libCoreClientiOS.a(tolua_gameinterface.o) |
17 |
void
std::__1::vector, std::__1::allocator > >::__push_back_slow_path const&>(std::__1::basic_string, std::__1::allocator > const&&&) in libCoreClientiOS.a(tolua_gameinterface.o) |
18 |
void
std::__1::vector >::__push_back_slow_path(int const&&&) in libCoreClientiOS.a(tolua_gameinterface.o) |
19 |
"std::__1::locale::use_facet(std::__1::locale::id&)
const" ,
referenced from: |
20 |
std::__1::basic_ostream
>& std::__1::endl >(std::__1::basic_ostream >&) in libCoreClientiOS.a(logicthread.o) |
21 |
"std::__1::ios_base::getloc()
const" ,
referenced from: |
22 |
std::__1::basic_ostream
>& std::__1::endl >(std::__1::basic_ostream >&) in libCoreClientiOS.a(logicthread.o) |
23 |
"std::__1::basic_string,
std::__1::allocator >::__init(char const*, unsigned long)" ,
referenced from: |
24 |
_l_registercallback in libCoreClientiOS.a(logicthread.o) |
25 |
_luapanic in libCoreClientiOS.a(logicthread.o) |
26 |
ExUnit::LogicThread::Run() in libCoreClientiOS.a(logicthread.o) |
27 |
ExUnit::LogicThread::HandleError() in libCoreClientiOS.a(logicthread.o) |
28 |
ExUnit::LogicThread::CallVA(char
const*, char const*, ...) in libCoreClientiOS.a(logicthread.o) |
29 |
ExUnit::LogicThread::RemoveCallback(char
const*) in libCoreClientiOS.a(logicthread.o) |
30 |
ExUnit::LogicThread::SetCallback(char
const*, int) in libCoreClientiOS.a(logicthread.o) |
32 |
"std::__1::basic_string,
std::__1::allocator >::assign(char const*)" ,
referenced from: |
33 |
System::SetEngineScriptPath(char
const*) in libCoreClientiOS.a(tolua_gameinterface.o) |
34 |
"std::__1::basic_string,
std::__1::allocator >::basic_string(std::__1::basic_string, std::__1::allocator > const&)" ,
referenced from: |
35 |
tolua_gameinterface_vector_string___geti00(lua_State*) in libCoreClientiOS.a(tolua_gameinterface.o) |
36 |
tolua_gameinterface_vector_string___geti01(lua_State*) in libCoreClientiOS.a(tolua_gameinterface.o) |
37 |
tolua_gameinterface_vector_string__push_back00(lua_State*) in libCoreClientiOS.a(tolua_gameinterface.o) |
38 |
void
std::__1::vector, std::__1::allocator > >::__push_back_slow_path const&>(std::__1::basic_string, std::__1::allocator > const&&&) in libCoreClientiOS.a(tolua_gameinterface.o) |
39 |
"std::__1::basic_string,
std::__1::allocator >::~basic_string()" ,
referenced from: |
40 |
_l_registercallback in libCoreClientiOS.a(logicthread.o) |
41 |
_luapanic in libCoreClientiOS.a(logicthread.o) |
42 |
ExUnit::LogicThread::Run() in libCoreClientiOS.a(logicthread.o) |
43 |
ExUnit::LogicThread::HandleError() in libCoreClientiOS.a(logicthread.o) |
44 |
ExUnit::LogicThread::CallVA(char
const*, char const*, ...) in libCoreClientiOS.a(logicthread.o) |
45 |
ExUnit::LogicThread::RemoveCallback(char
const*) in libCoreClientiOS.a(logicthread.o) |
46 |
ExUnit::LogicThread::SetCallback(char
const*, int) in libCoreClientiOS.a(logicthread.o) |
48 |
"std::__1::basic_string,
std::__1::allocator >::operator=(std::__1::basic_string, std::__1::allocator > const&)" ,
referenced from: |
49 |
tolua_gameinterface_vector_string___seti00(lua_State*) in libCoreClientiOS.a(tolua_gameinterface.o) |
50 |
"std::__1::basic_ostream
>::put(char)" ,
referenced from: |
51 |
std::__1::basic_ostream
>& std::__1::endl >(std::__1::basic_ostream >&) in libCoreClientiOS.a(logicthread.o) |
52 |
"std::__1::basic_ostream
>::flush()" ,
referenced from: |
53 |
std::__1::basic_ostream
>& std::__1::endl >(std::__1::basic_ostream >&) in libCoreClientiOS.a(logicthread.o) |
54 |
"std::__1::basic_ostream
>::sentry::sentry(std::__1::basic_ostream >&)" ,
referenced from: |
55 |
std::__1::basic_ostream
>& std::__1::operator<<<std::__1::char_traits >(std::__1::basic_ostream >&, char const*) in libCoreClientiOS.a(logicthread.o) |
56 |
"std::__1::basic_ostream
>::sentry::~sentry()" ,
referenced from: |
57 |
std::__1::basic_ostream
>& std::__1::operator<<<std::__1::char_traits >(std::__1::basic_ostream >&, char const*) in libCoreClientiOS.a(logicthread.o) |
58 |
"std::__1::cerr" ,
referenced from: |
59 |
ExUnit::LogicThread::Run() in libCoreClientiOS.a(logicthread.o) |
60 |
ExUnit::LogicThread::ContactTriggered(b2Contact*) in libCoreClientiOS.a(logicthread.o) |
61 |
ExUnit::LogicThread::SensorTriggered(b2Contact*) in libCoreClientiOS.a(logicthread.o) |
62 |
"std::__1::ctype::id" ,
referenced from: |
63 |
std::__1::basic_ostream
>& std::__1::endl >(std::__1::basic_ostream >&) in libCoreClientiOS.a(logicthread.o) |
64 |
"std::__1::locale::~locale()" ,
referenced from: |
65 |
std::__1::basic_ostream
>& std::__1::endl >(std::__1::basic_ostream >&) in libCoreClientiOS.a(logicthread.o) |
66 |
"std::__1::ios_base::__set_badbit_and_consider_rethrow()" ,
referenced from: |
67 |
std::__1::basic_ostream
>& std::__1::operator<<<std::__1::char_traits >(std::__1::basic_ostream >&, char const*) in libCoreClientiOS.a(logicthread.o) |
68 |
"std::__1::ios_base::clear(unsigned
int)" ,
referenced from: |
69 |
std::__1::basic_ostream
>& std::__1::operator<<<std::__1::char_traits >(std::__1::basic_ostream >&, char const*) in libCoreClientiOS.a(logicthread.o) |
70 |
ld:
symbol(s) not found for architecture
i386 |
71 |
clang:
error: linker command failed
with exit code
1 (use - v to
see invocation) |
看着就非常复杂!
有这么多的link STL的错误。
其实,就是你编译静态库的时候使用不同版本的标准库, C++ Standard Library
那么如何fix掉这个issue呢?看下面这两张图!
如果你这两个在编译静态库和在使用静态库的app中设置的是一样的,应该就可以解决掉这个问题!
事实上,compiler default 足够了。
今天,使用了第三方一个库,结果,出现,iOS Undefined symbols for architecture armv7 std::basic_string<char, std::char_traits<char>
注意:不是修改Build Setting里面的设置,而是添加一个libstdc++.dylib, 搞定!