[Bug ld/23304] New: ARM linker fails to combine identical typeinfo sections

[nickc at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=23304

            Bug ID: 23304
           Summary: ARM linker fails to combine identical typeinfo
                    sections
           Product: binutils
           Version: 2.31 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: nickc at redhat dot com
  Target Milestone: ---
            Target: ARM

Created attachment 11078
  --> https://sourceware.org/bugzilla/attachment.cgi?id=11078&action=edit
testcase.

The ARM linker fails to combine identical typeinfo sections from different
compilation units.

To see this compile the source files in the attached testcase with:

  g++ -c inst1.cpp inst2.cpp main.cpp
  g++ inst1.o inst2.o main.o

For the ARM target this will produce messages like this:

  ld-new: inst2.o:(.rodata+0x0): multiple definition of `typeinfo for 
  test_template<long, 2l>'; inst1.o:(.rodata+0x0): first defined here

Other targets, eg AArch64 and x86_64, do not have this problem.

This bug was originally reported alongside a memory exhaustion problem 
in the Fedora version of the linker:

  https://bugzilla.redhat.com/show_bug.cgi?id=1584711

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