为什么在使用 Core Plot 构建 iPhone 应用程序时会看到以下链接器错误？

Question

在构建使用 Core Plot 框架的 iPhone 应用程序时，我看到以下链接器错误：

ld: warning: ignoring file /Users/taxtmart5/Library/Developer/Xcode/DerivedData/Solagen_Calculator-cwvwcdlnuukfftakggygqoczxyuy/Build/Products/Debug-iphoneos/libCorePlot-CocoaTouch.a, file was built for archive which is not the architecture being linked (armv6)
Undefined symbols for architecture armv6:
  "_OBJC_CLASS_$_CPPlotRange", referenced from:
      objc-class-ref in VerticalBarChart.o
  "_OBJC_CLASS_$_CPXYGraph", referenced from:
      objc-class-ref in VerticalBarChart.o
  "_OBJC_CLASS_$_CPLineStyle", referenced from:
      objc-class-ref in VerticalBarChart.o
  "_OBJC_CLASS_$_CPTextStyle", referenced from:
      objc-class-ref in VerticalBarChart.o
  "_OBJC_CLASS_$_CPAxisLabel", referenced from:
      objc-class-ref in VerticalBarChart.o
  "_OBJC_CLASS_$_CPBarPlot", referenced from:
      objc-class-ref in VerticalBarChart.o
  "_CPDecimalFromString", referenced from:
      -[VerticalBarChart renderInLayer:withTheme:] in VerticalBarChart.o
  "_OBJC_CLASS_$_CPColor", referenced from:
      objc-class-ref in PlotItem.o
      objc-class-ref in VerticalBarChart.o
  "_OBJC_CLASS_$_CPMutableTextStyle", referenced from:
      objc-class-ref in PlotItem.o
  "_OBJC_CLASS_$_CPFill", referenced from:
      objc-class-ref in VerticalBarChart.o
  "_OBJC_CLASS_$_CPGraphHostingView", referenced from:
      objc-class-ref in PlotItem.o
  "_CPDecimalFromFloat", referenced from:
      -[VerticalBarChart renderInLayer:withTheme:] in VerticalBarChart.o
  "_kCPPlainWhiteTheme", referenced from:
      -[VerticalBarChart renderInLayer:withTheme:] in VerticalBarChart.o
  "_OBJC_CLASS_$_CPTheme", referenced from:
      objc-class-ref in VerticalBarChart.o
ld: symbol(s) not found for architecture armv6
collect2: ld returned 1 exit status

在 Xcode 3.x 下，我能够成功构建此项目，但使用 Xcode 4 时，它在定位设备时会出现上述错误（模拟器仍然可以正确构建）。

可能是什么原因导致这些错误，以及如何修复这些错误？

Answer 1

来解决我的问题

我可以通过更改构建设置、

架构

：标准（armv6，armv7）仅构建活动架构：是。

Answer 2

清理您的项目，库之间似乎不匹配，因此链接不起作用。