[r16-7292 Regression] FAIL: g++.dg/concepts/expression.C -std=gnu++17 (test for excess errors) on Linux/x86_64

Haochen Jiang via Gcc-regression <[email protected]>
Newsgroups gmane.comp.gcc.regression,gmane.comp.gcc.patches
Message-ID <[email protected]>
On Linux/x86_64,

3f7905550483408a2c4c5096a1adc8d7e863eb12 is the first bad commit
commit 3f7905550483408a2c4c5096a1adc8d7e863eb12
Author: Nathan Myers <[email protected]>
Date:   Mon Sep 22 23:52:52 2025 -0400

    libstdc++: container erasure overloads (P2077) [PR117404]

caused

FAIL: g++.dg/concepts/expression.C  -std=gnu++17 (test for excess errors)

with GCC configured with

../../gcc/configure --prefix=/export/users3/haochenj/src/gcc-bisect/master/master/r16-7292/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/concepts/expression.C --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=g++.dg/concepts/expression.C --target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=g++.dg/concepts/expression.C --target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=g++.dg/concepts/expression.C --target_board='unix{-m64\ -march=cascadelake}'"

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(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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