Extern Variable linkage error

in my Qt project i have a QString variable in one class(variable is gloablly defined in dialog1.cpp)

QString d;

i am trying to access the same variable from another class (variable is declared as extern in timeall.cpp)

extern QString d;

Wen i compile the file, there appears to be a linker error

collect2: ld returned 1 exit status

can you please post the actual error message.

here is the compile output

collect2: ld returned 1 exit status
make: Leaving directory `/root/Desktop/deep (copy)'
make: *** [UNI] Error 1
Exited with code 2.
Error while building project UNI
When executing build step 'Make'

Quote:

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in my Qt project i have a QString variable in one class(variable is gloablly defined in dialog1.cpp)

QString d;

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Can you show the code surrounding this declaration?