https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66329
Manuel López-Ibáñez <manu at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |manu at gcc dot gnu.org --- Comment #3 from Manuel López-Ibáñez <manu at gcc dot gnu.org> --- This is warned by -Wparentheses (which is enabled by -Wall): test.cc:9:8: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] if (y&1 == 0) ^ You should use -Wall -Wextra before reporting bugs, as the bug reporting instructions say. (although the warning text has never sounded clear to me)