On Linux/x86_64,

6e0a231a4aa2407bb7167daf98a37795a67364d8 is the first bad commit
commit 6e0a231a4aa2407bb7167daf98a37795a67364d8
Author: Jason Merrill <ja...@redhat.com>
Date:   Wed Jan 27 17:15:39 2021 -0500

    c++: alias in qualified-id in template arg [PR98570]

caused

FAIL: g++.dg/modules/xtreme-header-1_a.H module-cmi  
(gcm.cache/$srcdir/g++.dg/modules/xtreme-header-1_a.H.gcm)
FAIL: g++.dg/modules/xtreme-header-1_a.H -std=c++2a (internal compiler error)
FAIL: g++.dg/modules/xtreme-header-1_a.H -std=c++2a (test for excess errors)
FAIL: g++.dg/pr77550.C   (internal compiler error)
FAIL: g++.dg/pr77550.C   (test for excess errors)

with GCC configured with

../../gcc/configure 
--prefix=/local/skpandey/gccwork/toolwork/gcc-bisect-master/master/r11-7011/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="modules.exp=g++.dg/modules/xtreme-header-1_a.H 
--target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=g++.dg/pr77550.C 
--target_board='unix{-m32}'"

(Please do not reply to this email, for question about this report, contact me 
at skpgkp2 at gmail dot com)

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