[r11-6448 Regression] 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" on Linux/x86_64

[sunil.k.pandey via Gcc-patches]

On Linux/x86_64,

a5469584f61abeec98ff89347294f9ed72eca280 is the first bad commit
commit a5469584f61abeec98ff89347294f9ed72eca280
Author: Nathan Sidwell <nat...@acm.org>
Date:   Mon Jan 4 07:45:36 2021 -0800

    c++: Add stdlib module test cases

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"

with GCC configured with

../../gcc/configure 
--prefix=/local/skpandey/gccwork/toolwork/gcc-bisect-master/master/r11-6448/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)