问题标签 [duplicate-symbol]
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c - C中的重复符号错误
我有以下代码布局
头文件.h
和两个文件（我们称它们为 file1.c 和 file2.c）
所以编译工作正常，但链接器命令失败，因为编译器说有重复的函数定义。如何在仍然使用头文件的情况下避免这种情况？当我只在标头中定义函数并创建另一个包含完整函数的 .c 文件时，它工作正常。我一直认为在标题中声明它是要走的路。
c - Why redefinition of a function which is already present in dynamic or static library does not throw any error?
Wy redefinition of function already present in dynamic library does not throws any compilation and linking error?
In the below function
Inside the shared library Definition of mean function already present as below.
The definition of mean function is already present in the shared library libmean.so. But during compilation I don't see any redefinition error and compilation is successful.
And on successful execution the o/p I see is 0 instead of 4 so the function definition of mean inside the shared library is not getting executed but the one inside the main module is getting executed.
Why is this happening so?
c++ - 关于链接器命令失败，退出代码为 1
我在我创建的头文件（MapData.h）中定义了命名空间“MAPDATA”，并在“MAPDATA”中定义了一个变量。
地图数据.h
但是，如果我在 else 类中写 #include "MapData.h"，Linker 会出现以下错误。
但是，如果我删除名称空间的名称（MAPDATA）并在其他类中写入#include“MapData.h”，错误就会消失。
删除命名空间名称后
如果有人能清楚地解释为什么错误消失了，我将永远感激不尽。
ios - iOS 模拟器启动失败，应用程序在 iPhone 上启动正常
尝试在 iOS 模拟器上启动应用程序（在 iPhone 4S 上启动时没有问题）时出现 Mach-O 链接器错误。
错误：
ld：架构 i386 clang 的 224 个重复符号：错误：链接器命令失败，退出代码为 1（使用 -v 查看调用）
我对重复符号错误感到困惑，而且这似乎只是模拟器上的一个问题。
c++ - Why do C++ member functions defined in a class not produce duplicate symbols, whereas they do in C?
C Example
bb.c:
main.c:
aa.h:
bb.h:
C Result
Compiled with clang main.c bb.c:
C++ Example
b.cpp:
main.cpp:
a.hpp:
b.hpp:
C++ Result
The above compiles fine with clang++ main.cpp b.cpp and the output to the program is:
Questions
Why does the duplicate error not occur with the C++ version?
Does the fact that the function
void a::doit()is defined in the header file rather than a source file mean that the compiler will automatically inline the function?
ios - ld：架构 armv7 Xcode 项目的 xx 个重复符号
大家好，我有一个 Xcode 项目，每次尝试构建项目时都会出现此错误：
ld：架构armv7 Xcode项目clang的xx重复符号：错误：链接器命令失败，退出代码为1 ...
我搜索了一下，大多数解决方案都说要在项目的构建阶段->编译资源部分中删除重复文件，或者在某些文件中将导入 .m 更改为 .h。问题是编译资源的列表甚至没有排序，我什至不知道要修复哪些文件，因为我的项目中有很多文件。关于如何清理它的任何建议？
xcode - 目标 C，Mach-O 链接器错误
在这里，我需要修复一个 Mach-0 链接器错误。我发现另一个问题与我的非常相似，但解决方案不可行。我该如何解决这个问题？
更新 1：添加了重复的符号
ld /Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Products/Debug-iphonesimulator/SliderGalore-game.app/SliderGalore-game normal i386 cd "/Volumes/GEOFF'S USB/SliderGalore-game " setenv IPHONEOS_DEPLOYMENT_TARGET 7.0 setenv PATH "/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/bin: /bin:/usr/sbin:/sbin" /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch i386 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms /iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator7.0。sdk -L/Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Products/Debug-iphonesimulator -F/Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/ Build/Products/Debug-iphonesimulator -filelist /Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator/SliderGalore-game.build/Objects-正常/i386/SliderGalore-game.LinkFileList -Xlinker -objc_abi_version -Xlinker 2 -fobjc-arc -fobjc-link-runtime -Xlinker -no_implicit_dylibs -mios-simulator-version-min=7。0 -framework CoreGraphics -framework UIKit -framework Foundation -Xlinker -dependency_info -Xlinker /Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator/SliderGalore -game.build/Objects-normal/i386/SliderGalore-game_dependency_info.dat -o /Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Products/Debug-iphonesimulator/SliderGalore-game.app /SliderGalore-游戏
重复符号 _OBJC_IVAR_$_SliderGaloreController.tileImageView 在：/Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator/SliderGalore-game.build/Objects- normal/i386/SliderGaloreController.o /Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator/SliderGalore-game.build/Objects-normal/ i386/SliderGaloreFlipsideViewController.o 重复符号 _OBJC_IVAR_$_SliderGaloreController.tiles 在：/Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator/SliderGalore-game .build/Objects-normal/i386/SliderGaloreController.o /Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator/SliderGalore-game.build/ Objects-normal/i386/SliderGaloreFlipsideViewController.o 重复符号_NUM_HORIZONTAL_PIECES 在：/Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator/SliderGalore-game .build/Objects-normal/i386/SliderGaloreController.o /Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator/SliderGalore-game.build /Objects-正常/i386/SliderGaloreFlipsideViewController。o 重复符号 _OBJC_IVAR_$_SliderGaloreController.tileWidth 在：/Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator/SliderGalore-game.build/Objects -normal/i386/SliderGaloreController.o /Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator/SliderGalore-game.build/Objects-normal /i386/SliderGaloreFlipsideViewController.o 重复符号_NUM_VERTICAL_PIECES 在：/Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator/SliderGalore-game.build/对象-正常/i386/SliderGaloreController。o /Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator/SliderGalore-game.build/Objects-normal/i386/SliderGaloreFlipsideViewController.o 重复符号 _OBJC_IVAR_$_SliderGaloreController.tileHeight 在：/Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator/SliderGalore-game.build/Objects-normal /i386/SliderGaloreController.o /Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator/SliderGalore-game.build/Objects-normal/i386 /SliderGaloreFlipsideViewController。o 重复符号 _OBJC_IVAR_$_SliderGaloreController.blankPosition 在：/Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator/SliderGalore-game.build/Objects -normal/i386/SliderGaloreController.o /Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator/SliderGalore-game.build/Objects-normal /i386/SliderGaloreFlipsideViewController.o 重复符号 _OBJC_IVAR_$_SliderGaloreController.timer 在：/Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator/SliderGalore-游戏。build/Objects-normal/i386/SliderGaloreController.o /Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator/SliderGalore-game.build/ Objects-normal/i386/SliderGaloreFlipsideViewController.o 重复符号_countmove 在：/Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator/SliderGalore-game .build/Objects-normal/i386/SliderGaloreController.o /Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator/SliderGalore-game.build /Objects-normal/i386/SliderGaloreFlipsideViewController.o 复制符号 _thetime 在：/Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator/SliderGalore-game.build/Objects-normal/i386/SliderGaloreController.o /Users /GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator/SliderGalore-game.build/Objects-normal/i386/SliderGaloreFlipsideViewController.o重复符号_OBJC_IVAR_$ _SliderGaloreController.image查看在：/Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator/SliderGalore-game.build/Objects-normal/i386/ SliderGaloreController。o /Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator/SliderGalore-game.build/Objects-normal/i386/SliderGaloreFlipsideViewController.o 重复符号_OBJC_IVAR_$_SliderGaloreFlipsideViewController.Puzzle图片在：/Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator/SliderGalore-game.build/Objects-normal /i386/SliderGaloreController.o /Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator/SliderGalore-game.build/Objects-normal/i386 /SliderGaloreFlipsideViewController。o 重复符号 _OBJC_IVAR_$_SliderGaloreFlipsideViewController.CountMoves 在：/Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator/SliderGalore-game.build/Objects -normal/i386/SliderGaloreController.o /Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator/SliderGalore-game.build/Objects-normal /i386/SliderGaloreFlipsideViewController.o 重复符号 _OBJC_IVAR_$_SliderGaloreFlipsideViewController.Timer 在：/Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build-Debug-iphoneGalore/Slider游戏。build/Objects-normal/i386/SliderGaloreController.o /Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator/SliderGalore-game.build/ Objects-normal/i386/SliderGaloreFlipsideViewController.o 重复符号 _OBJC_IVAR_$_SliderGaloreFlipsideViewController.PuzzleLayoutX 在：/Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/-Debugsimulator /SliderGalore-game.build/Objects-normal/i386/SliderGaloreController.o /Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator/SliderGalore -游戏。build/Objects-normal/i386/SliderGaloreFlipsideViewController.o 重复符号 _OBJC_IVAR_$_SliderGaloreFlipsideViewController.PuzzleLayoutY 在：/Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/ -iphonesimulator/SliderGalore-game.build/Objects-normal/i386/SliderGaloreController.o /Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator /SliderGalore-game.build/Objects-normal/i386/SliderGaloreFlipsideViewController.o 重复符号_OBJC_IVAR_$_SliderGaloreFlipsideViewController.Refresh in：/Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic-Build/Intermediates/SliderG游戏。build/Debug-iphonesimulator/SliderGalore-game.build/Objects-normal/i386/SliderGaloreController.o /Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/ Debug-iphonesimulator/SliderGalore-game.build/Objects-normal/i386/SliderGaloreFlipsideViewController.o 重复符号_OBJC_IVAR_$_SliderGaloreFlipsideViewController._delegate 在：/Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/BuildIntermediate /SliderGalore-game.build/Debug-iphonesimulator/SliderGalore-game.build/Objects-normal/i386/SliderGaloreController.o /Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore -game.build/Debug-iphonesimulator/SliderGalore-game。build/Objects-normal/i386/SliderGaloreFlipsideViewController.o 重复符号 _OBJC_CLASS_$_SliderGaloreController 在：/Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator /SliderGalore-game.build/Objects-normal/i386/SliderGaloreController.o /Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator/SliderGalore -game.build/Objects-normal/i386/SliderGaloreFlipsideViewController.o 重复符号 _OBJC_METACLASS_$_SliderGaloreController 在：/Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game。build/Debug-iphonesimulator/SliderGalore-game.build/Objects-normal/i386/SliderGaloreController.o /Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/ Debug-iphonesimulator/SliderGalore-game.build/Objects-normal/i386/SliderGaloreFlipsideViewController.o 重复符号_OBJC_CLASS_$_SliderGaloreFlipsideViewController 在：/Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/Sli -game.build/Debug-iphonesimulator/SliderGalore-game.build/Objects-normal/i386/SliderGaloreController.o /Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game .build/Debug-iphonesimulator/SliderGalore-game。build/Objects-normal/i386/SliderGaloreFlipsideViewController.o 重复符号 _OBJC_METACLASS_$_SliderGaloreFlipsideViewController 在：/Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator /SliderGalore-game.build/Objects-normal/i386/SliderGaloreController.o /Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator/SliderGalore -game.build/Objects-normal/i386/SliderGaloreFlipsideViewController.o/Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator/SliderGalore-game.build/Objects-normal/i386/SliderGaloreController.o /Users /GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator/SliderGalore-game.build/Objects-normal/i386/SliderGaloreFlipsideViewController.o/Users/GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator/SliderGalore-game.build/Objects-normal/i386/SliderGaloreController.o /Users /GeoffSang/Library/Developer/Xcode/DerivedData/SliderGalore-game-gbmatdleglcvgscnctvgetfcneic/Build/Intermediates/SliderGalore-game.build/Debug-iphonesimulator/SliderGalore-game.build/Objects-normal/i386/SliderGaloreFlipsideViewController.o构建/对象-正常/i386/SliderGaloreFlipsideViewController.o构建/对象-正常/i386/SliderGaloreFlipsideViewController.o
ld：架构 i386 的 22 个重复符号 clang：错误：链接器命令失败，退出代码为 1（使用 -v 查看调用）
c++ - C 标头的重复符号问题
这是我第一次处理比简单的 write-single-source-file-and-compile 例程稍微复杂的 CUDA 项目。正如预期的那样，我遇到了 C 标头的一些问题，即重复符号。
根据链接器，在多个文件中包含以下头文件会产生冲突.cu：
env_vars.h
多显卡
adm_matrix.cu
在 Nsight Eclipse Edition 中构建项目会导致链接器抱怨h_n_osc变量被定义了两次：
通过 Internet 搜索，我意识到将变量的声明移动h_n_osc到multigpu.cu并将其重新声明为extern变量adm_matrix.cu（以及以后我可能需要它的任何地方）可以解决问题，事实上它确实如此。
问题解决了，但我想更深入地研究一下：
- 为什么链接器也不抱怨
d_n_osc变量？为什么常数（例如OMEGA_0）同样不是问题？ - 这是否意味着不能将全局变量放在头文件中？
- 最让我困惑的是，互联网上的一些消息来源指出，重复符号错误只会在头文件包含变量定义时发生，而它的简单声明不应该构成问题。我很难相信这一点的原因是即使我的标题只包含一个声明，我也面临着这个问题！我错过了什么吗？
提前感谢您的耐心等待，伙计们！
ios - iOS duplicate symbols from different versions of the same library
App A requires third-party libraries B and C. Both B and C include different versions of library D (from a further third-party). No third-party source code is available. This will give duplicate symbol errors when linking the app.
What solutions are available?
Related question involving identical libraries, allowing one copy to simply be deleted: How to handle duplicate symbol error from 3rd party libraries?
ios - xCode：目标 C：重复符号错误
在文件 CarArray（没有任何扩展名）中，我有这样的数组（这是一个非常简化的版本）：
现在我想从多个文件中的数组中读取数据，所以我只需使用#import "CarArray"
我使用循环来读取数据。然后我收到这样的错误：
我该如何解决这个问题？