[llvm-bugs] [Bug 38106] Undefined reference error when "static const" variable is initialized in line (but works out of line)

via llvm-bugs llvm-bugs at lists.llvm.org
Mon Jul 9 10:23:08 PDT 2018


David Blaikie <dblaikie at gmail.com> changed:

           What    |Removed                     |Added
             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID
                 CC|                            |dblaikie at gmail.com

--- Comment #1 from David Blaikie <dblaikie at gmail.com> ---
This code (with the static member definition commented out) exhibits undefined
behavior due to an ODR use of 'foo' without a definition of 'foo'.

The "const static long long foo = 5;" (even with the "= 5") is only a
declaration of foo and must have an out of line definition (the initial value
("= 5") can remain in the declaration if you want/for various reasons).

If you want to keep the initial value inline at the declaration, then omit the
initial value in the definition (write it as "const long long Foo::foo;").

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