[r11-7560 Regression] FAIL: g++.dg/modules/builtin-3_a.C -std=c++2b scan-lang-dump module "Wrote GMF:-[0-9]* type_decl:'::__builtin_va_list'@builtins" on Linux/x86_64

[sunil.k.pandey]

On Linux/x86_64,

bc56d27de97ecea813279ce5ba45b278dcccfe21 is the first bad commit
commit bc56d27de97ecea813279ce5ba45b278dcccfe21
Author: Nathan Sidwell <nathan@acm.org>
Date:   Mon Mar 8 11:55:26 2021 -0800

    C++: Enable c++2b module mode [PR 99436]

caused

FAIL: g++.dg/modules/builtin-3_a.C -std=c++17  scan-lang-dump module "Writing:-[0-9]*'s named merge key \\(decl\\) type_decl:'::__builtin_va_list'"
FAIL: g++.dg/modules/builtin-3_a.C -std=c++17  scan-lang-dump module "Wrote GMF:-[0-9]* type_decl:'::__builtin_va_list'@builtins"
FAIL: g++.dg/modules/builtin-3_a.C -std=c++2a  scan-lang-dump module "Writing:-[0-9]*'s named merge key \\(decl\\) type_decl:'::__builtin_va_list'"
FAIL: g++.dg/modules/builtin-3_a.C -std=c++2a  scan-lang-dump module "Wrote GMF:-[0-9]* type_decl:'::__builtin_va_list'@builtins"
FAIL: g++.dg/modules/builtin-3_a.C -std=c++2b  scan-lang-dump module "Writing:-[0-9]*'s named merge key \\(decl\\) type_decl:'::__builtin_va_list'"
FAIL: g++.dg/modules/builtin-3_a.C -std=c++2b  scan-lang-dump module "Wrote GMF:-[0-9]* type_decl:'::__builtin_va_list'@builtins"

with GCC configured with

../../gcc/configure --prefix=/local/skpandey/gccwork/toolwork/gcc-bisect-master/master/r11-7560/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/builtin-3_a.C --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="modules.exp=g++.dg/modules/builtin-3_a.C --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)