On Linux/x86_64,

d8889c99aab4b599aa7ceb7079e69a9766171336 is the first bad commit
commit d8889c99aab4b599aa7ceb7079e69a9766171336
Author: Nathan Sidwell <nat...@acm.org>
Date:   Wed Feb 17 10:43:21 2021 -0800

    c++: Macros need to be GTY-reachable [PR 99023]

caused

FAIL: g++.dg/modules/pr99023_a.H module-cmi ,/pr99023_a.H 
(gcm.cache/,/pr99023_a.H.gcm)
FAIL: g++.dg/modules/pr99023_a.H (test for excess errors)

with GCC configured with

../../gcc/configure 
--prefix=/local/skpandey/gccwork/toolwork/gcc-bisect-master/master/r11-7271/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/pr99023_a.H 
--target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="modules.exp=g++.dg/modules/pr99023_a.H --target_board='unix{-m32\ 
-march=cascadelake}'"

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

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