QT在主窗口.o和***.o文件中重复符号

Question

我有点困惑，我正在尝试开发一个简单的应用程序。

应用程序流程：主窗口->对话框1->对话框2。

MainWindow导入Dialog1.h，Dialog1.h导入Dialog2.h

1） 如果我在Dialog1.cpp和Dialog2.cpp中都导入TinyXML库，编译器抛出以下错误：重复符号**RANDOM TINYXML CLASS*，位于：对话框1.o对话框2.o

2） 当Dialog1.h导入Dialog2.h时，即使我尝试仅在Dialog2.h中导入TinyXML库，我仍然会收到以下错误：重复符号**RANDOM TINYXML CLASS*，位于：主窗口-omoc_Dialog2.o

我没有在主窗口中导入任何内容。尽管如此，错误仍然存在。

我哪里出了问题，有什么帮助吗？

错误日志（有732，只是复制粘贴了一堆）：

duplicate symbol __ZN11TiXmlString7reserveEm in:
    mainwindow.o
    selectorteach.o
duplicate symbol __ZN11TiXmlString8nullrep_E in:
    mainwindow.o
    selectorteach.o
duplicate symbol __ZN11TiXmlString6assignEPKcm in:
    mainwindow.o
    selectorteach.o
duplicate symbol __ZN11TiXmlString6appendEPKcm in:
    mainwindow.o
    selectorteach.o
duplicate symbol __ZplRK11TiXmlStringS1_ in:
    mainwindow.o
    selectorteach.o
duplicate symbol __ZplRK11TiXmlStringPKc in:
    mainwindow.o
    selectorteach.o
duplicate symbol __ZplPKcRK11TiXmlString in:
    mainwindow.o
    selectorteach.o
duplicate symbol __Z10TiXmlFOpenPKcS0_ in:
    mainwindow.o
    selectorteach.o
duplicate symbol __ZN9TiXmlBase12EncodeStringERK11TiXmlStringPS0_ in:
    mainwindow.o
    selectorteach.o
duplicate symbol __ZN9TiXmlBase6entityE in:
    mainwindow.o
    selectorteach.o
duplicate symbol __ZN9TiXmlNodeC2ENS_8NodeTypeE in:
    mainwindow.o
    selectorteach.o
duplicate symbol __ZTV9TiXmlNode in:
    mainwindow.o
    selectorteach.o
duplicate symbol __ZN9TiXmlNodeD2Ev in:
    mainwindow.o
    selectorteach.o
duplicate symbol __ZN9TiXmlNodeD1Ev in:
    mainwindow.o
    selectorteach.o
duplicate symbol __ZN9TiXmlNodeD0Ev in:
    mainwindow.o
    selectorteach.o
duplicate symbol __ZNK9TiXmlNode6CopyToEPS_ in:
    mainwindow.o
    selectorteach.o
duplicate symbol __ZN9TiXmlNode5ClearEv in:
    mainwindow.o
    selectorteach.o
--------------------------------------------------------------------
duplicate symbol __ZNK12TiXmlElement22QueryUnsignedAttributeEPKcPj in:
    mainwindow.o
    teachmode.o
duplicate symbol __ZNK12TiXmlElement18QueryBoolAttributeEPKcPb in:
    mainwindow.o
    teachmode.o
duplicate symbol __ZN9TiXmlBase11StringEqualEPKcS1_b13TiXmlEncoding in:
    mainwindow.o
    teachmode.o
duplicate symbol __ZNK12TiXmlElement20QueryDoubleAttributeEPKcPd in:
    mainwindow.o
    teachmode.o
duplicate symbol __ZN12TiXmlElement12SetAttributeEPKci in:
    mainwindow.o
    teachmode.o
duplicate symbol __ZN17TiXmlAttributeSet12FindOrCreateEPKc in:
    mainwindow.o
    teachmode.o
duplicate symbol __ZN14TiXmlAttribute11SetIntValueEi in:
    mainwindow.o
    teachmode.o
duplicate symbol __ZN17TiXmlAttributeSet3AddEP14TiXmlAttribute in:
    mainwindow.o
    teachmode.o
duplicate symbol __ZN12TiXmlElement18SetDoubleAttributeEPKcd in:
    mainwindow.o
    teachmode.o
duplicate symbol __ZN14TiXmlAttribute14SetDoubleValueEd in:
    mainwindow.o
    teachmode.o
duplicate symbol __ZNK12TiXmlElement5PrintEP7__sFILEi in:
    mainwindow.o
    teachmode.o
duplicate symbol __ZNK12TiXmlElement6AcceptEP12TiXmlVisitor in:
    mainwindow.o
    teachmode.o
duplicate symbol __ZNK12TiXmlElement5CloneEv in:
    mainwindow.o
    teachmode.o
duplicate symbol __ZNK12TiXmlElement7GetTextEv in:
    mainwindow.o
    teachmode.o
duplicate symbol __ZN13TiXmlDocumentC2Ev in:
--------------------------------------------------------------------
duplicate symbol __ZN9TiXmlBase6entityE in:
    mainwindow.o
    moc_selectorteach.o
duplicate symbol __ZN9TiXmlNodeC2ENS_8NodeTypeE in:
    mainwindow.o
    moc_selectorteach.o
duplicate symbol __ZTV9TiXmlNode in:
    mainwindow.o
    moc_selectorteach.o
duplicate symbol __ZN9TiXmlNodeD2Ev in:
    mainwindow.o
    moc_selectorteach.o
duplicate symbol __ZN9TiXmlNodeD1Ev in:
    mainwindow.o
    moc_selectorteach.o
duplicate symbol __ZN9TiXmlNodeD0Ev in:
    mainwindow.o
    moc_selectorteach.o
duplicate symbol __ZNK9TiXmlNode6CopyToEPS_ in:
    mainwindow.o
    moc_selectorteach.o
duplicate symbol __ZN9TiXmlNode5ClearEv in:
    mainwindow.o
    moc_selectorteach.o
duplicate symbol __ZN9TiXmlNode12LinkEndChildEPS_ in:
    mainwindow.o
    moc_selectorteach.o
duplicate symbol __ZN13TiXmlDocument8SetErrorEiPKcP16TiXmlParsingData13TiXmlEncoding in:
    mainwindow.o
    moc_selectorteach.o
duplicate symbol __ZNK9TiXmlNode11GetDocumentEv in:
    mainwindow.o
    moc_selectorteach.o
duplicate symbol __ZN9TiXmlBase11errorStringE in:
    mainwindow.o
    moc_selectorteach.o
duplicate symbol __ZN16TiXmlParsingData5StampEPKc13TiXmlEncoding in:
    mainwindow.o
    moc_selectorteach.o
duplicate symbol __ZN9TiXmlNode14InsertEndChildERKS_ in:
    mainwindow.o
    moc_selectorteach.o
duplicate symbol __ZN9TiXmlNode17InsertBeforeChildEPS_RKS_ in:
    mainwindow.o
    moc_selectorteach.o
duplicate symbol __ZN9TiXmlNode16InsertAfterChildEPS_RKS_ in:
    mainwindow.o
    moc_selectorteach.o
duplicate symbol __ZN9TiXmlNode12ReplaceChildEPS_RKS_ in:
--------------------------------------------------------------------
    moc_teachmode.o
duplicate symbol __ZN9TiXmlText5ParseEPKcP16TiXmlParsingData13TiXmlEncoding in:
    mainwindow.o
    moc_teachmode.o
duplicate symbol __ZN16TiXmlDeclaration5ParseEPKcP16TiXmlParsingData13TiXmlEncoding in:
    mainwindow.o
    moc_teachmode.o
duplicate symbol __ZTV12TiXmlPrinter in:
    mainwindow.o
    moc_teachmode.o
duplicate symbol __ZTV14TiXmlAttribute in:
    mainwindow.o
    moc_teachmode.o
duplicate symbol __ZTV12TiXmlUnknown in:
    mainwindow.o
    moc_teachmode.o
duplicate symbol __ZTV9TiXmlText in:
    mainwindow.o
    moc_teachmode.o
duplicate symbol __ZN11TiXmlString4nposE in:
    mainwindow.o
    moc_teachmode.o
duplicate symbol __ZTI9TiXmlNode in:
    mainwindow.o
    moc_teachmode.o
duplicate symbol __ZTI12TiXmlElement in:
    mainwindow.o
    moc_teachmode.o
duplicate symbol __ZTI13TiXmlDocument in:
    mainwindow.o
    moc_teachmode.o
duplicate symbol __ZTI12TiXmlComment in:
    mainwindow.o
    moc_teachmode.o
duplicate symbol __ZTI16TiXmlDeclaration in:
    mainwindow.o
    moc_teachmode.o
duplicate symbol __ZTI14TiXmlAttribute in:
    mainwindow.o
    moc_teachmode.o
duplicate symbol __ZTS14TiXmlAttribute in:
    mainwindow.o
    moc_teachmode.o
duplicate symbol __ZTS9TiXmlNode in:
    mainwindow.o
    moc_teachmode.o
duplicate symbol __ZTS12TiXmlComment in:
    mainwindow.o
    moc_teachmode.o
duplicate symbol __ZTI9TiXmlText in:
    mainwindow.o
    moc_teachmode.o
duplicate symbol __ZTS9TiXmlText in:
    mainwindow.o
    moc_teachmode.o
duplicate symbol __ZTS16TiXmlDeclaration in:
    mainwindow.o
    moc_teachmode.o
duplicate symbol __ZTI12TiXmlUnknown in:
    mainwindow.o
    moc_teachmode.o
duplicate symbol __ZTS12TiXmlUnknown in:
    mainwindow.o
    moc_teachmode.o
duplicate symbol __ZTS13TiXmlDocument in:
    mainwindow.o
    moc_teachmode.o
duplicate symbol __ZTI12TiXmlPrinter in:
    mainwindow.o
    moc_teachmode.o
duplicate symbol __ZTS12TiXmlPrinter in:
    mainwindow.o
    moc_teachmode.o
duplicate symbol __ZTS12TiXmlElement in:
    mainwindow.o
    moc_teachmode.o
ld: 732 duplicate symbols for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [untitled.app/Contents/MacOS/untitled] Error 1
19:03:15: The process "/usr/bin/make" exited with code 2.
Error while building/deploying project untitled (kit: Desktop Qt 5.4.0 clang 64bit)
When executing step "Make"

注意：当我只在Dialog2.cpp中包含这些文件时，项目会编译，所有函数都能按预期工作。只有当我把它放在头文件中时，问题才会出现。我的TinyXML包含指令：-

   #include <tinystr.h>
   #include <tinyxml.h>
   #include <tinystr.cpp>
   #include <tinyxmlerror.cpp
   #include <tinyxml.cpp>
   #include <tinyxmlparser.cpp>

如果我只包括源文件，例如：

#include <tinystr.h>
#include <tinyxml.h>

我得到以下错误日志：

Undefined symbols for architecture x86_64:
  "TiXmlString::assign(char const*, unsigned long)", referenced from:
      TiXmlString::operator=(char const*) in teachmode.o
  "TiXmlString::nullrep_", referenced from:
      TiXmlString::quit() in teachmode.o
  "TiXmlElement::SetAttribute(char const*, char const*)", referenced from:
      saveData(product) in teachmode.o
  "TiXmlElement::SetAttribute(char const*, int)", referenced from:
      saveData(product) in teachmode.o
  "TiXmlElement::TiXmlElement(char const*)", referenced from:
      saveData(product) in teachmode.o
  "TiXmlDocument::LoadFile(char const*, TiXmlEncoding)", referenced from:
      saveData(product) in teachmode.o
  "TiXmlDocument::TiXmlDocument()", referenced from:
      saveData(product) in teachmode.o
  "TiXmlDeclaration::TiXmlDeclaration(char const*, char const*, char const*)", referenced from:
      saveData(product) in teachmode.o
  "TiXmlNode::LinkEndChild(TiXmlNode*)", referenced from:
      saveData(product) in teachmode.o
  "TiXmlNode::TiXmlNode(TiXmlNode::NodeType)", referenced from:
      TiXmlText::TiXmlText(char const*) in teachmode.o
  "TiXmlNode::~TiXmlNode()", referenced from:
      TiXmlDocument::~TiXmlDocument() in teachmode.o
      TiXmlText::TiXmlText(char const*) in teachmode.o
  "TiXmlDocument::SaveFile(char const*) const", referenced from:
      saveData(product) in teachmode.o
  "TiXmlNode::FirstChildElement() const", referenced from:
      TiXmlNode::FirstChildElement() in teachmode.o
  "vtable for TiXmlDocument", referenced from:
      TiXmlDocument::~TiXmlDocument() in teachmode.o
  NOTE: a missing vtable usually means the first non-inline virtual member function has no definition.
  "vtable for TiXmlText", referenced from:
      TiXmlText::TiXmlText(char const*) in teachmode.o
  NOTE: a missing vtable usually means the first non-inline virtual member function has no definition.
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [untitled.app/Contents/MacOS/untitled] Error 1
19:25:51: The process "/usr/bin/make" exited with code 2.
Error while building/deploying project untitled (kit: Desktop Qt 5.4.0 clang 64bit)
When executing step "Make"

Answer 1

不要包含源文件，这就是导致问题的原因！

只包括头文件，然后像编译和链接自己的源文件一样编译和链接源文件。

---

源文件包含所有函数的定义，并且程序中只能有一个定义。