"Multiple definition" error only for additional header file in Qt CMakeFile

[ben.boeckel (Ben Boeckel (Kitware))]

@prex

I added static , which solves this issue. Is this a valid solution?

Each TU will get its own copy of the string list. This is fine as long as you don’t require that the address of each error string is the same between TUs.

@prex

But why do I even need to add any header files in add_executable ?

If you don’t list the headers, automoc doesn’t know which files to scan for Q_OBJECT and friends.

@prex

And even if I add the header files to add_library , it still gets me the undefined reference error.

I suspect some other headers are likely missing in that case. Depends on the exact errors.