[Bug symtab/30174] Rework 'main' name yet again

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

https://sourceware.org/bugzilla/show_bug.cgi?id=30174

--- Comment #5 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom Tromey from comment #4)
> > I build the branch (I had to build with gcc-12, I ran into a build breaker
> > with gcc-7)
> 
> What was that?

This one:
...
In file included from /data/vries/gdb/src/gdb/dwarf2/cooked-index.h:39:0,
                 from /data/vries/gdb/src/gdb/dwarf2/cooked-index.c:21:
/data/vries/gdb/src/gdb/../gdbsupport/task-group.h:90:34: error: use of deleted
function ‘std::ato\
mic<int>::atomic(const std::atomic<int>&)’
   std::atomic<int> m_completed = 0;
                                  ^
In file included from /usr/include/c++/7/future:42:0,
                 from /data/vries/gdb/src/gdb/../gdbsupport/thread-pool.h:31,
                 from /data/vries/gdb/src/gdb/dwarf2/cooked-index.h:33,
                 from /data/vries/gdb/src/gdb/dwarf2/cooked-index.c:21:
/usr/include/c++/7/atomic:668:7: note: declared here
       atomic(const atomic&) = delete;
       ^~~~~~
/usr/include/c++/7/atomic:672:17: note:   after user-defined conversion:
constexpr std::atomic<int\
>::atomic(std::atomic<int>::__integral_type)
       constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
                 ^~~~~~
...
and two more like it.

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