[Bug ld/23388] New: [2.31 Regression] produces large 64-bit multilib libraries on i386

[doko at debian dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=23388

            Bug ID: 23388
           Summary: [2.31 Regression] produces large 64-bit multilib
                    libraries on i386
           Product: binutils
           Version: 2.31
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: doko at debian dot org
  Target Milestone: ---

[ forwarded from https://bugs.debian.org/903376 ]

This is seen at least when building x86_64 and x86_64-gnux32 libraries on
i686-linux-gnu:

> Package: libc6-amd64
> Version: 2.27-4
> Severity: important
>
> On i386, libc6-amd64 and libc6-x32 install more than one gigabyte each:
>
> ,----
> | $ apt-cache show libc6-amd64 libc6-x32 | grep Installed-Size
> | Installed-Size: 1143839
> | Installed-Size: 1143407
> `----
>
> Looking at /lib64, all the .so files from libc6-amd64 are over four
> megs, although file(1) reports them as stripped.

Looks like that is a binutils bug, I see the same problem when building
the ncurses multilib packages.  Apparently this started when I upgraded
binutils from 2.30-22 to 2.30.90.20180627-1.

These libraries have a large number of null bytes in them, their
occupied space is reduced considerably in a sparse copy:

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