[Bug gas/32391] New: \@ incorrectly handled in nested macros

[regis.duchesne at broadcom dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=32391

            Bug ID: 32391
           Summary: \@ incorrectly handled in nested macros
           Product: binutils
           Version: 2.38
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: regis.duchesne at broadcom dot com
  Target Milestone: ---

Compiling this code

===
.macro outer
   before_inner_\@:
      nop
   .macro inner
      inside_inner_\@:
         nop
   .endm
   inner
   inner
   after_inner_\@:
      nop
.end
outer
===

errors out with

===
Error: symbol `inside_inner_0' is already defined
===

This occurs because \@ in the inner macro evaluates to the same value as \@ in
the outer macro (in this case 0), and since the inner macro is executed twice
the inside_inner_0 label is output twice, i.e. redefined.

However, the sole purpose of the \@ pseudo-variable is to generate unique names
inside macros, so this behavior is highly unexpected and in my opinion a bug.

What is expected is that this code should compile without errors, and produce
this output

===
before_inner_0:
   nop
inside_inner_1:
   nop
inside_inner_2:
   nop
after_inner_0:
   nop
===

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