[Bug gas/31396] New: Symbols referenced from ".if"/"==" end up in the symbol table

[palmer at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=31396

            Bug ID: 31396
           Summary: Symbols referenced from ".if"/"==" end up in the
                    symbol table
           Product: binutils
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: palmer at gcc dot gnu.org
  Target Milestone: ---

Nathan and I were playing around with some odd behavior in dav1d and I've
managed to reduce the test case down to something small.  I'm just not actually
sure the behavior is a bug.  We were looking at the RISC-V port, but the
behavior seems the same on x86 as well:

$ cat test.s
.text

.if undefined == 0
.endif

.global main
main:
$ gcc test.s -o test.o -c
$ objdump -dt test.o

test.o:     file format elf64-x86-64

SYMBOL TABLE:
0000000000000000         *UND*  0000000000000000 undefined
0000000000000000 g       .text  0000000000000000 main

The resulting objects link fine, I guess because nothing is actually trying to
resolve a reference to the undefined symbol.  It just seems a little odd to
have something unreferenced and undefined end up in the symbol table.

I haven't really spent much time touching these more generic bits of GAS and
just grepping for "==" is pretty useless, thus I'm a bit lost here.  As far as
I can tell this isn't actually causing any adverse effects, but I figured I'd
at least file something in case anyone else is interested.

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