[r16-4421 Regression] FAIL: std/ranges/adaptors/93978.cc -std=gnu++26 (test for excess errors) on Linux/x86_64

"Jiang, Haochen via Gcc-regression" <[email protected]>
Newsgroups gmane.comp.gcc.regression,gmane.comp.gcc.patches
Message-ID <SJ5PPF77D28E3C2F6AD6717451F56520D22ECE9A@SJ5PPF77D28E3C2.namprd11.prod.outlook.com>
On Linux/x86_64,

59cabe08b57a262d5d7d041515889a012189c908 is the first bad commit
commit 59cabe08b57a262d5d7d041515889a012189c908
Author: Tomasz KamiÅ"ski <[email protected]>
Date:   Tue Jul 8 18:50:50 2025 +0200

    libstdc++: Implement _Escaping_sink to avoid construction of string

caused

FAIL: g++.dg/warn/uninit-pr105562.C  -std=gnu++26 (test for excess errors)
FAIL: g++.dg/warn/Wstringop-overflow-6.C  -std=gnu++26 (test for excess errors)
FAIL: g++.old-deja/g++.robertl/eb73.C  -std=gnu++26 (test for excess errors)
FAIL: std/ranges/adaptors/93978.cc  -std=gnu++26 (test for excess errors)

with GCC configured with

../../gcc/configure --prefix=/export/users3/haochenj/src/gcc-bisect/master/master/r16-4421/usr --enable-clocale=gnu --with-system-zlib --with-demangler-in-ld --with-fpmath=sse --enable-languages=c,c++,fortran --enable-cet --without-isl --enable-libmpx x86_64-linux --disable-bootstrap

To reproduce:

$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=g++.dg/warn/uninit-pr105562.C --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=g++.dg/warn/uninit-pr105562.C --target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=g++.dg/warn/uninit-pr105562.C --target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=g++.dg/warn/uninit-pr105562.C --target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=g++.dg/warn/Wstringop-overflow-6.C --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=g++.dg/warn/Wstringop-overflow-6.C --target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=g++.dg/warn/Wstringop-overflow-6.C --target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=g++.dg/warn/Wstringop-overflow-6.C --target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="old-deja.exp=g++.old-deja/g++.robertl/eb73.C --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="old-deja.exp=g++.old-deja/g++.robertl/eb73.C --target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="old-deja.exp=g++.old-deja/g++.robertl/eb73.C --target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="old-deja.exp=g++.old-deja/g++.robertl/eb73.C --target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/x86_64-linux/libstdc++-v3/testsuite && make check RUNTESTFLAGS="conformance.exp=std/ranges/adaptors/93978.cc --target_board='unix{-m32}'"
$ cd {build_dir}/x86_64-linux/libstdc++-v3/testsuite && make check RUNTESTFLAGS="conformance.exp=std/ranges/adaptors/93978.cc --target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/x86_64-linux/libstdc++-v3/testsuite && make check RUNTESTFLAGS="conformance.exp=std/ranges/adaptors/93978.cc --target_board='unix{-m64}'"
$ cd {build_dir}/x86_64-linux/libstdc++-v3/testsuite && make check RUNTESTFLAGS="conformance.exp=std/ranges/adaptors/93978.cc --target_board='unix{-m64\ -march=cascadelake}'"

(Please directly reply to this email for question about this report.)
(If you met problems with cascadelake related, disabling AVX512F in command line might save that.)
(However, please make sure that there is no potential problems with AVX512.)
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