[Bug c/100140] New: Reference gcc development github mirror - Latest Development Build

["j130496 at live dot co.uk" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100140

            Bug ID: 100140
           Summary: Reference gcc development github mirror - Latest
                    Development Build
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: j130496 at live dot co.uk
  Target Milestone: ---

Dear sir

Posting as under:

Used ../configure --enable-multilib and then make -s from build directory
created inside source downloaded from
https://github.com/gcc-mirror/gcc/commit/d64720a07f611c55e8c815c775a852d650a2e738
(link of latest GCC administrator bump on GCC development github mirror)

I am reproducing the comment posted there which gives entire details required
for bug tracking and resolving. Unfortunately, no developers are responding to
my messages on Github development builds since last 2 days hence posting here:

Posted as under on Github: 

Dear sir

As conveyed earlier - even after latest daily bump, the following error while
using ../configure --enable-multilib followed by make -s persists. Request you
and entire community of developers to look into - I am not a developer myself
otherwise I could look into this and resolve myself and would have posted pull
request to be merged instead of requesting again and again. Facing this make -s
error since last 3 days. As I have personal interest in testing new development
of GCC 11 version (although not a developer and also not knowing much about C
and C++) - I am daily testing after changes. Error copied from terminal screen
is as under:

113 | "~" |
| ^~~~~~~~
gengtype-lex.c:365:15: warning: this statement may fall through
[-Wimplicit-fallthrough=]
365 | #define YY_DO_BEFORE_ACTION
| ~~~~~~~~~~~~~^~~~~~~
../../gcc/gengtype-lex.l:138:1: note: in expansion of macro
‘YY_DO_BEFORE_ACTION’
138 | ;
| ^ ~
../../gcc/gengtype-lex.l:134:1: note: here
134 | "ENUM_BITFIELD"{WS}?"("{WS}?{ID}{WS}?")" {
| ^~~~
/usr/local/x86_64-pc-linux-gnu/bin/ld:
/home/admin/Downloads/gcc_18042021_1708hrs_IST/build/prev-x86_64-pc-linux-gnu/libstdc++-v3/src/.libs/libstdc++.a(guard.o):
in function __gnu_cxx::__is_single_threaded()':
/home/admin/Downloads/gcc_18042021_1708hrs_IST/build/x86_64-pc-linux-gnu/libstdc++-v3/include/ext/atomicity.h:52:
undefined reference to __libc_single_threaded'
/usr/local/x86_64-pc-linux-gnu/bin/ld:
/home/admin/Downloads/gcc_18042021_1708hrs_IST/build/x86_64-pc-linux-gnu/libstdc++-v3/include/ext/atomicity.h:52:
undefined reference to __libc_single_threaded'
/usr/local/x86_64-pc-linux-gnu/bin/ld:
/home/admin/Downloads/gcc_18042021_1708hrs_IST/build/x86_64-pc-linux-gnu/libstdc++-v3/include/ext/atomicity.h:52:
undefined reference to __libc_single_threaded'
collect2: error: ld returned 1 exit status
make[3]: *** [Makefile:3008: build/genpreds] Error 1
make[2]: *** [Makefile:4822: all-stage2-gcc] Error 2
make[1]: *** [Makefile:25993: stage2-bubble] Error 2
make: *** [Makefile:1001: all] Error 2

My OS details: OS - AlmaLinux 8.3 x86_64 - kernel - 5.11.11-1.el8.elrepo.x86_64

Current stable GCC version details from terminal screen:

[root@admin build]# gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/x86_64-pc-linux-gnu/10.3.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../configure --enable-multilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 10.3.0 (GCC)

Once again requesting all to look into. 

Thank you in advance.

Regards,