https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62270
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> --- You can see these errors if you try to bootstrap gcc with this patch: diff --git a/gcc/c-family/c.opt b/gcc/c-family/c.opt index d619250..d84b9fe 100644 --- a/gcc/c-family/c.opt +++ b/gcc/c-family/c.opt @@ -519,7 +519,7 @@ C ObjC C++ ObjC++ Var(warn_logical_op) Init(0) Warning Warn when a logical operator is suspiciously always evaluating to true or false Wlogical-not-parentheses -C ObjC C++ ObjC++ Var(warn_logical_not_paren) Warning +C ObjC C++ ObjC++ Var(warn_logical_not_paren) Warning LangEnabledBy(C ObjC C++ ObjC++,Wall) Warn when logical not is used on the left hand side operand of a comparison Wlong-long
