[Bug libstdc++/103445] New: build failure for old versions of mingw32 (not mingw-w64)

[Bug libstdc++/103445] New: build failure for old versions of mingw32 (not mingw-w64)

[unlvsur at live dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103445

            Bug ID: 103445
           Summary: build failure for old versions of mingw32 (not
                    mingw-w64)
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: unlvsur at live dot com
  Target Milestone: ---

Created attachment 51885
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=51885&action=edit
error message

i tried to use an dev c++ 4.9.9.2's mingw crt to build gcc, we have some
filesystem build failures

[Bug libstdc++/103445] build failure for old versions of mingw32 (not mingw-w64)

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103445

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
How old is that? We generally only support building with recent versions that
are still supported by mingw.

[Bug libstdc++/103445] build failure for old versions of mingw32 (not mingw-w64)

[unlvsur at live dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103445

--- Comment #2 from cqwrteur <unlvsur at live dot com> ---
(In reply to Jonathan Wakely from comment #1)
> How old is that? We generally only support building with recent versions
> that are still supported by MinGW.

dev C++'s mingw.

that is mingw-w64. not mingw.

[Bug libstdc++/103445] build failure for old versions of mingw32 (not mingw-w64)

[unlvsur at live dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103445

--- Comment #3 from cqwrteur <unlvsur at live dot com> ---
(In reply to cqwrteur from comment #2)
> (In reply to Jonathan Wakely from comment #1)
> > How old is that? We generally only support building with recent versions
> > that are still supported by MinGW.
> 
> dev C++'s mingw.
> 
> that is mingw-w64. not mingw.

because gcc does not seem to be able to cross-compile correctly on old
versions' windows.

[Bug libstdc++/103445] build failure for old versions of mingw32 (not mingw-w64)

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103445

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Sorry, I don't understand anything above. I don't care whether you're using
mingw or mingw-w64, what I asked is how old it is. Libstdc++ expects a recent
version, and I'm not surprised if it doesn't work with older versions. It's
just not worth the effort to support very old version.

Maybe we can add some more configure checks for _wstat64 and ftruncate64 and
skip all the filesystem code if building against an old CRT.

[Bug libstdc++/103445] build failure for old versions of mingw32 (not mingw-w64)

[unlvsur at live dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103445

--- Comment #5 from cqwrteur <unlvsur at live dot com> ---
(In reply to Jonathan Wakely from comment #4)
> Sorry, I don't understand anything above. I don't care whether you're using
> mingw or mingw-w64, what I asked is how old it is. Libstdc++ expects a
> recent version, and I'm not surprised if it doesn't work with older
> versions. It's just not worth the effort to support very old version.
> 
> Maybe we can add some more configure checks for _wstat64 and ftruncate64 and
> skip all the filesystem code if building against an old CRT.

I do not know how old it is. it comes from dev c++ 4.9.9.2 (dev c++ is a dead
project) which uses gcc 3.4.2.

The issue I encountered is that mingw-w64 does not run properly sometimes for
certain reasons on old version of windows.

"Maybe we can add some more configure checks for _wstat64 and ftruncate64 and
skip all the filesystem code if building against an old CRT."
Yeah. Sounds good. But I think support that version of crt from dev c++ has
more issues than just this.

I think just better just add a configure to skip filesystem code manually. That
would trivialize a lot of things, rather than wasting time supporting old
versions of crt.

[Bug libstdc++/103445] build failure for old versions of mingw32 (not mingw-w64)

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103445

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |WONTFIX

--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Just don't use old junk, or stick to older versions of gcc.