Declaring a common variable in a header gives linker error
45671
duplicate symbol error C++
20598
gcc does not include extern variables in symbol table when optimisation is used
149350
'foo' was not declared in this scope c++
150533
What's the difference between a header file and a library?
14909
How do I use extern to share variables between source files?
130199
Main Program and Shared Library initializes same static variable in __static_initialization_and_destruction_0
34264
Why is my HelloWorld function not declared in this scope?
146862
Compiler error: "initializer element is not a compile-time constant"
129766
decltype in class method declaration: error when used before "referenced" member is declared
142743
Template issue causes linker error (C++)
65880
Why can't structs be declared as const?
96756
Is it a good practice to place C++ definitions in header files?
108400
Using "namespace foo {" instead of explicitly qualifying outside of header files
125535
How do I fix this "identifier is not declared in the current scope" error?
33453
Why do I get "unresolved external symbol" errors when using templates?
52420
Programs compiles in g++ but exits with linker errors in gcc
120041
Why does c++ pointer * associate to the variable declared, not the type?