https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67980
Bug ID: 67980
Summary: left shift count is negative [-Wshift-count-negative]
generated for unreachable code
Product: gcc
Version: 5.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: nacitar at ubercpp dot com
Target Milestone: ---
Created attachment 36519
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36519&action=edit
test driver
With -Wall, unreachable code in a constexpr function generates a warning if
written using c++14's expanded constexpr and using actual if statements,
however does not in the case of a ternary-styled c++11 constexpr function.
This can be worked around using template specializations, but certainly this
error shouldn't happen given that these values are all known at compilation
time and it's impossible for that count to ever actually be negative.
This is a simplification of the problem from a larger issue.
