On Linux/x86_64,

1ba71fabb78b18884e9f479f45a257bab50e8959 is the first bad commit
commit 1ba71fabb78b18884e9f479f45a257bab50e8959
Author: Nathan Sidwell <nat...@acm.org>
Date:   Fri Jan 15 06:47:13 2021 -0800

    preprocessor: Make quoting : [PR 95253]

caused

FAIL: g++.dg/modules/dep-1_a.C -std=c++17  scan-file \\nm\\\\:part\\.c\\+\\+m: 
gcm.cache/m-part\\.gcm
FAIL: g++.dg/modules/dep-1_a.C -std=c++17  scan-file \\n\\.PHONY: 
m\\\\:part\\.c\\+\\+m
FAIL: g++.dg/modules/dep-1_a.C -std=c++2a  scan-file \\nm\\\\:part\\.c\\+\\+m: 
gcm.cache/m-part\\.gcm
FAIL: g++.dg/modules/dep-1_a.C -std=c++2a  scan-file \\n\\.PHONY: 
m\\\\:part\\.c\\+\\+m
FAIL: g++.dg/modules/dep-2.C -std=c++17  scan-file \\nm\\\\:part\\.c\\+\\+m: 
gcm.cache/m-part\\.gcm
FAIL: g++.dg/modules/dep-2.C -std=c++17  scan-file \\n\\.PHONY: 
m\\\\:part\\.c\\+\\+m
FAIL: g++.dg/modules/dep-2.C -std=c++2a  scan-file \\nm\\\\:part\\.c\\+\\+m: 
gcm.cache/m-part\\.gcm
FAIL: g++.dg/modules/dep-2.C -std=c++2a  scan-file \\n\\.PHONY: 
m\\\\:part\\.c\\+\\+m

with GCC configured with

../../gcc/configure 
--prefix=/local/skpandey/gccwork/toolwork/gcc-bisect-master/master/r11-6725/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/dep-1_a.C --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="modules.exp=g++.dg/modules/dep-1_a.C --target_board='unix{-m32\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="modules.exp=g++.dg/modules/dep-1_a.C --target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="modules.exp=g++.dg/modules/dep-1_a.C --target_board='unix{-m64\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="modules.exp=g++.dg/modules/dep-2.C --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="modules.exp=g++.dg/modules/dep-2.C --target_board='unix{-m32\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="modules.exp=g++.dg/modules/dep-2.C --target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="modules.exp=g++.dg/modules/dep-2.C --target_board='unix{-m64\ 
-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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