https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91391
Bug ID: 91391
Summary: Bogus -Wcomma-subscript
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: sbergman at redhat dot com
Target Milestone: ---
With recent git master (4ad9380bafd772cea54392c7189cab07a2121fc9 here):
> $ cat test.cc
> #include <map>
> #include <utility>
> int main() {
> std::map<std::pair<int, int>, int> m;
> m[std::pair<int, int>(0, 0)] = 0;
> }
> $ g++ -fsyntax-only -std=c++2a test.cc
> test.cc: In function ‘int main()’:
> test.cc:5:20: warning: top-level comma expression in array subscript is
> deprecated [-Wcomma-subscript]
> 5 | m[std::pair<int, int>(0, 0)] = 0;
> | ^
It should apparently not warn about the nested comma in the
template-parameter-list, and I wonder whether it should warn about a
(hypothetical) comma expression in a call to an overloaded operator [] at all.
