[Bug ld/29998] New: ld terminated with signal 11 [Segmentation fault] under mingw with LTO

[medhefgo at web dot de]

https://sourceware.org/bugzilla/show_bug.cgi?id=29998

            Bug ID: 29998
           Summary: ld terminated with signal 11 [Segmentation fault]
                    under mingw with LTO
           Product: binutils
           Version: 2.39
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: medhefgo at web dot de
  Target Milestone: ---

The following build steps will result in bfd crashing. This only seems to
happen with a mingw gcc toolchain and only if LTO is used. I can reproduce this
with mingw gcc 12 on arch and debian unstable. This does not happen with the
mingw gcc 10 from debian stable. This crash only happens with mingw, I was not
able to reproduce with a regular gcc targeting ELF.

$ cat test1.c 
void test1(void) {
}

$ cat test2.c
void test1(void);
void test2(void) {
        char a[4096];
        test1();
}

$ rm -f libtest.a *.obj
lto="-flto=auto"
x86_64-w64-mingw32-gcc $lto -o test1.obj -c test1.c
x86_64-w64-mingw32-gcc $lto -o test2.obj -c test2.c
x86_64-w64-mingw32-gcc-ar csrDT libtest.a test1.obj
x86_64-w64-mingw32-gcc $lto -nostdlib -o test test2.obj libtest.a -lgcc
collect2: fatal error: ld terminated with signal 11 [Segmentation fault], core
dumped
compilation terminated.

$ x86_64-w64-mingw32-gcc --version
x86_64-w64-mingw32-gcc (GCC) 12-win32

$ x86_64-w64-mingw32-ld --version
GNU ld (GNU Binutils) 2.39.90.20230110

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