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Editorial Team
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Asked: 2026-05-12T15:40:59+00:00

This is the specific error I am getting: libFoo.so: undefined reference to `IID_IFOOBAR’ collect2:

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This is the specific error I am getting:

libFoo.so: undefined reference to `IID_IFOOBAR'
collect2: ld returned 1 exit status
make: *** [/home/F.exe] Error 1

when I try to check the symbols in my object file A.o

nm A.obj | grep IID_

I get no symbols listed in my object file of the ‘IID_IFOOBAR’ that should be there since it is defined in a header file as:

extern const blahType IID_IFOOBAR

Am I missing something? Should IID_IFOOBAR be defined differently somewhere since it is an extern variable? If this question is too specific I will remove it. But perhaps someone’s intuition will help me here.

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1 Answer

  1. Editorial Team

    [EDIT]
    Add the definition of the variable somewhere (without extern). Extern identifiers without initializers are not definitions – the definition must be somewhere else.

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