[Bug ld/19480] [2.26.51 regression] ld creates wrong output for libstdc++6.dll for mingw32 (32-bit)

[steve at sk2 dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=19480

--- Comment #6 from Stephen Kitt <steve at sk2 dot org> ---
Hi Nick,

> First of all, please try out the patch that I am about to upload.  It may be
> that the problem is that the linker is garbage collecting sections that are
> really needed, because the linker script failed to mark those sections as
> KEEP.  (You may need to check that the linker script you are using is the one
> that is fixed by the uploaded patch.  Add -Wl,--verbose to the gcc command
> line to check this).

The only difference I see is that the exception tables are preserved with 2.26
and your patch. I'm attaching the logs of two builds with --verbose and
--print-gc-sections, one with ld 2.25.90.20151209 (the version where we saw
this starting) and one with ld 2.26 and your patch.

> If that does not work then try adding -Wl,--print-gc-sections to the bad DLL
> creation command line.  See what gets thrown away, see if this matches up with
> the undefined symbols, and try to work out why they are being thrown away.

There are a lot of sections being thrown away, and they do match the undefined
symbols. I haven't figured out why they're being thrown away yet.

Regards,

Stephen

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