On Linux/x86_64,

222f7f90191563a71dfbc710c8de950ace91c439 is the first bad commit
commit 222f7f90191563a71dfbc710c8de950ace91c439
Author: Patrick Palka <[email protected]>
Date:   Thu Aug 20 16:58:18 2026 -0400

    c++: add fixed test [PR126472]

caused

FAIL: g++.dg/cpp0x/initlist135.C  -std=c++11 (test for excess errors)
FAIL: g++.dg/cpp0x/initlist135.C  -std=c++20 (test for excess errors)
FAIL: g++.dg/cpp0x/initlist135.C  -std=c++29 (test for excess errors)

with GCC configured with

../../gcc/configure 
--prefix=/export/users3/haochenj/src/gcc-bisect/master/master/r17-3480/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/cpp0x/initlist135.C --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="dg.exp=g++.dg/cpp0x/initlist135.C --target_board='unix{-m32\ 
-march=cascadelake}'"

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(If you met problems with cascadelake related, disabling AVX512F in command 
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(However, please make sure that there is no potential problems with AVX512.)

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