CODEWITHSUNDEEP
iosobjective-cxcodelinker-errors
samb90
samb90

Reputation: 1073

Linker Error - Objective C

This error happens when I try to import the file "VARendererViewController.h" from the file "VAMenuScreenViewController"

duplicate symbol _gestureMinimumTranslation in:
/Users/Sam/Library/Developer/Xcode/DerivedData/Virtual_Human_Avatar-fwgdkxpnkzapxrdzkggtmbnfhjwb/Build/Intermediates/Virtual Human Avatar.build/Debug-iphonesimulator/Virtual Human Avatar.build/Objects-normal/i386/VARendererViewController.o
/Users/Sam/Library/Developer/Xcode/DerivedData/Virtual_Human_Avatar-fwgdkxpnkzapxrdzkggtmbnfhjwb/Build/Intermediates/Virtual Human Avatar.build/Debug-iphonesimulator/Virtual Human Avatar.build/Objects-normal/i386/VAMenuScreenViewController.o

ld: 1 duplicate symbol for architecture i386 clang: error: linker command failed with exit code 1 (use -v to see invocation)

Could anyone provide me with some

Upvotes: 0

Views: 1517

Answers (2)

Matt Melton
Matt Melton

Reputation: 2643

The linker is trying to join a set of objects with a common symbol. This often happens when the Compile Sources Build Phase has duplicate entries or a header file. Try removing these.

Upvotes: 0

bbum
bbum

Reputation: 162712

You have two compilation units -- two source files -- that are defining the same symbol.

This may be because you defined the symbol in two separate .m files (or other compilation unit; .c, .mm, etc...) or because you defined the symbol in a header file and imported it into those two files. Alternatively, if you shove a variable declaration into a header file without the extern, then it'll cause a symbol by that name to be created in every .m file it is imported into.

Assuming gestureMinimumTranslation is a variable, then if you really want a global variable, it should be defined in only one .m file as follows:

int gestureMinimumTranslation;

Then, in the corresponding header:

extern int gestureMinimumTranslation;

And the other .m file should import the above header.

Upvotes: 4

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