[Bug c++/93805] [8/9/10 Regression] A suspicious -Werror=noexcept warning since r8-2461-g9fb82e652cee118b
cvs-commit at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Mon Mar 23 20:12:30 GMT 2020
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93805
--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Patrick Palka <ppalka@gcc.gnu.org>:
https://gcc.gnu.org/g:1f6c1c82eb5001a844b5ac535f6aba4a3257031f
commit r10-7345-g1f6c1c82eb5001a844b5ac535f6aba4a3257031f
Author: Patrick Palka <ppalka@redhat.com>
Date: Fri Mar 13 14:30:39 2020 -0400
c++: Avoid a suspicious -Wnoexcept warning [PR93805]
In this PR we're emitting -Wnoexcept warnings about potentially-throwing
NSDMIs
when computing the noexcept specification of a class's defaulted default
constructor. Although these warnings are in some sense valid, this patch
takes
the route of suppressing them, because:
1. the warning message is confusing in its current form;
2. warning for 'struct C { B b = B(); };' but not for 'struct C { B b;
};'
is inconsistent; and
3. emitting a warning here arguably doesn't fall under the umbrella of
-Wnoexcept, whose documentation says it warns only when a
noexcept-expression evaluates to false, but there are no
noexcept-expressions here.
gcc/cp/ChangeLog:
PR c++/93805
* except.c (maybe_noexcept_warning): Add TODO comment.
* method.c (walk_field_subobs): Pass tf_none to expr_noexcept_p.
gcc/testsuite/ChangeLog:
PR c++/93805
* g++.dg/warn/Wnoexcept2.C: New test.
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