https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66505
Bug ID: 66505
Summary: -Wno-error=pedantic does not reverse -Werror
-Wpedantic
Product: gcc
Version: 4.9.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: preprocessor
Assignee: unassigned at gcc dot gnu.org
Reporter: chrysn at fsfe dot org
Target Milestone: ---
the -Wno-error=pedantic option fails to undo the combined effects of -Werror
and -Wpedantic, for example when dealing with binary constants.
code like
int main() { int i = 0b0; }
fails to compile with `-Werror -Wpedantic`, while it does compile with either
option, and adding the `-Wno-error=pedantic` option does not change that.
the error message shown is
error: binary constants are a GCC extension [-Werror]
which indicates that no special-purpose warning exists for the behavior. it has
been suggested by redi on irc that a `-Wbinary-constants` should be introduced
(along with other specific labels like imaginary-constants) to combat this, and
that the relevant code is around libcpp/expr.c:697.
as a workaround, i'm explicitly setting every -Wfoo option (except -Wpedantic)
as -Werror=foo.
