[Bug gas/26253] New: Support SHF_LINK_ORDER with sh_link=0

[i at maskray dot me]

https://sourceware.org/bugzilla/show_bug.cgi?id=26253

            Bug ID: 26253
           Summary: Support SHF_LINK_ORDER with sh_link=0
           Product: binutils
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: i at maskray dot me
  Target Milestone: ---

After the resolution to bug 25381, we have a way to mark a section as
SHF_LINK_ORDER. We probably need a way to support sh_link=0.

For one thing, sh_link=0 may be generated by a relocatable link. It may be a
good idea having a way to "serialize" the output into an assembly file and GNU
as applying on the file can give back the object file. For the second use case,
the linked-to object may be optimized out in a code generation step and we need
a way to represent it.

I am currently thinking of representing sh_link=0 with a literal 0

.section .meta,"ao",@progbits,0

Note that 

.text
"0":
.section .meta,"ao",@progbits,"0"

is supposed to link .text . However, GNU as doesn't currently like "0"

a.s: Assembler messages:
a.s: Error: undefined linked-to symbol `0"' on section `.meta'

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