[Bug ld/26103] New: Assertion failure at ldlang.c:7269 when compiling with LTO on MinGW

[markus.boeck02 at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=26103

            Bug ID: 26103
           Summary: Assertion failure at ldlang.c:7269 when compiling with
                    LTO on MinGW
           Product: binutils
           Version: 2.35 (HEAD)
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: markus.boeck02 at gmail dot com
  Target Milestone: ---

Since a patch that has been included in GCC 9 using LTO with target
x86_64-mingw32 has been causing an assertion in ld when using a static build of
libstdc++. I have looked around and found a similar issue here:
https://sourceware.org/bugzilla/show_bug.cgi?id=24567 and applied the same
logging which yields following result:

A:c:/gcc/bin/../lib/gcc/x86_64-w64-mingw32/10/crtend.o
B:c:/gcc/bin/../lib/gcc/x86_64-w64-mingw32/10/crtend.o
A:C:\Users\Markus\AppData\Local\Temp\ccnx0ebg.ltrans0.ltrans.o
B:C:\Users\Markus\AppData\Local\Temp\ccnx0ebg.ltrans0.ltrans.o
A:(c:/gcc/bin/../lib/gcc/x86_64-w64-mingw32/10\libstdc++.a)ios.o
B:c:/gcc/bin/../lib/gcc/x86_64-w64-mingw32/10\libstdc++.a(ios.o)
C:c:/gcc/bin/../lib/gcc/x86_64-w64-mingw32/10\libstdc++.a(iostream-inst.o)
c:/gcc/bin/../lib/gcc/x86_64-w64-mingw32/10/../../../../x86_64-w64-mingw32/bin/ld.exe:
internal error ../../ld/ldlang.c 7274
collect2.exe: error: ld returned 1 exit status

A simple reproduction is a cpp file with the content:

#include <sstream>

int main()
{
    std::stringstream ss;
}

which must then be compiled using the command

g++-10 -static-libstdc++ -flto -fno-fat-lto-objects test.cpp

Tested specifically with ld from current master
(cebd6b8ac1c5a2a847a50e3efe932ff2d0867b3e) and current HEAD of GCC 8
(33ebf40daa79a73e66c379728b4c0ef7297297fe), GCC 9
(6dee1cefd81bd7e5fb1fbee727794e073f5e34a6) and GCC 10
(7783ab7bceb912373d9513af658aba40ede87b1b) on both windows and linux as host
operating system

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