See bug #752012
Created attachment 681817 [details] build.log and emerge --info.txt I can reproduce with gcc-11.0.9999-d54be5a but I believe it's safe to say there's no need to report more of these for QT components given the issue appears generalized, especially if all there is to say is reference another bug.
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=608616191dce3dca8e059a86bd960c2ab0e44c39 commit 608616191dce3dca8e059a86bd960c2ab0e44c39 Author: Andreas Sturmlechner <asturm@gentoo.org> AuthorDate: 2021-01-11 00:20:19 +0000 Commit: Andreas Sturmlechner <asturm@gentoo.org> CommitDate: 2021-01-24 13:03:14 +0000 dev-qt: Fix build for QT5_MODULE=qtbase w/ GCC-11 Closes: https://bugs.gentoo.org/752012 Closes: https://bugs.gentoo.org/764038 Package-Manager: Portage-3.0.12, Repoman-3.0.2 Signed-off-by: Andreas Sturmlechner <asturm@gentoo.org> dev-qt/qtconcurrent/Manifest | 1 + dev-qt/qtconcurrent/qtconcurrent-5.15.2.ebuild | 4 ++++ dev-qt/qtcore/Manifest | 1 + dev-qt/qtcore/qtcore-5.15.2-r2.ebuild | 3 +++ dev-qt/qtdbus/Manifest | 1 + dev-qt/qtdbus/qtdbus-5.15.2.ebuild | 4 ++++ dev-qt/qtgui/Manifest | 1 + dev-qt/qtgui/qtgui-5.15.2-r1.ebuild | 4 +++- dev-qt/qtnetwork/Manifest | 1 + dev-qt/qtnetwork/qtnetwork-5.15.2-r1.ebuild | 2 ++ dev-qt/qtopengl/Manifest | 1 + dev-qt/qtopengl/qtopengl-5.15.2.ebuild | 4 ++++ dev-qt/qtprintsupport/Manifest | 1 + dev-qt/qtprintsupport/qtprintsupport-5.15.2.ebuild | 4 ++++ dev-qt/qtsql/Manifest | 1 + dev-qt/qtsql/qtsql-5.15.2.ebuild | 5 +++++ dev-qt/qttest/Manifest | 1 + dev-qt/qttest/qttest-5.15.2.ebuild | 4 ++++ dev-qt/qtwidgets/Manifest | 1 + dev-qt/qtwidgets/qtwidgets-5.15.2.ebuild | 3 +++ dev-qt/qtxml/Manifest | 1 + dev-qt/qtxml/qtxml-5.15.2.ebuild | 4 ++++ 22 files changed, 51 insertions(+), 1 deletion(-)