https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83468
--- Comment #2 from Hannes Roest <hannesroest at gmx dot ch> --- > -Wsystem-headers enables the warning. only when compiling with optimizations on. If you simply use "-Wuninitialized -Werror -Wall -Wextra -Wsystem-headers" then it compiles. Also "-Wuninitialized -Werror -Wall -Wextra -O3" compiles whereas "-Wuninitialized -Werror -Wall -Wextra -O3 -Wsystem-headers" is the only configuration where it emits the warning.
