[Bug build/28318] New: [gdb/build] std::thread support configure check does not used CXX_DIALECT

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=28318

            Bug ID: 28318
           Summary: [gdb/build] std::thread support configure check does
                    not used CXX_DIALECT
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: build
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

As reported here
(https://sourceware.org/pipermail/gdb-patches/2021-September/181862.html ):
...
I find:
...
CXX_DIALECT='-std=gnu++11'
...
in the config.log, but that setting is not used when checking for
CXX_STD_THREAD, so we have:
...
configure:14614: checking for std::thread
configure:14631: g++ -c -pthread -Wall -O2 -g     conftest.cpp >&5
In file included from /usr/include/c++/4.8/thread:35:0,
                 from conftest.cpp:167:
/usr/include/c++/4.8/bits/c++0x_warning.h:32:2: error: #error This file
requires compiler and library support for the ISO C++ 2011 standard.
This support is currently experimental, and must be enabled with the
-std=c++11 or -std=gnu++11 compiler options.
 #error This file requires compiler and library support for the \
  ^
conftest.cpp: In function 'int main()':
conftest.cpp:172:1: error: 'thread' is not a member of 'std'
 std::thread t(callback);
 ^
conftest.cpp:172:13: error: expected ';' before 't'
 std::thread t(callback);
             ^
configure:14631: $? = 1
...

It could be that:
...
$ g++ -std=gnu++11 -c -pthread -Wall -O2 -g     conftest.cpp
...
actually would succeed.
...

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