https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115624
Bug ID: 115624
Summary: '-Wnrvo' is not an option that controls warnings
Product: gcc
Version: 14.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: albrecht.guendel at web dot de
Target Milestone: ---
Hi,
the new -Wnrvo warning is an amazing diagnostic.
However it does not play well with the #pragma GCC diagnostic directive. Yet.
Test-Case: https://godbolt.org/z/Tq8e8zPx8
For the sake of completeness, here is the code:
using GCC 14.1 with "-Wnrvo" option
#include <string>
#pragma GCC diagnostic ignored "-Wnrvo"
std::string no_nrvo(int i)
{
std::string ret{};
if (i % 2)
return {};
return ret;
}
Current behavior:
warning: '-Wnrvo' is not an option that controls warnings [-Wpragmas]
warning: not eliding copy on return in 'std::string no_nrvo(int)' [-Wnrvo]
Expected behavior:
accept the "#pragma GCC diagnostic ignored" and do not diagnose the missed
optimization.
