[Bug gas/27074] New: Warning option for "bare" symbol names in .intel_syntax noprefix mode

[josh at joshtriplett dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=27074

            Bug ID: 27074
           Summary: Warning option for "bare" symbol names in
                    .intel_syntax noprefix mode
           Product: binutils
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: josh at joshtriplett dot org
  Target Milestone: ---

In .intel_syntax noprefix mode, the assembler accepts code like this:

mov rax, some_symbol

The assembler treats the bare "some_symbol" as equivalent to "[some_symbol]".
I've seen many people misunderstand this, and think that it's equivalent to
"offset some_symbol" instead. This leads to confusion, and challenging
debugging adventures.

The warning would suggest either using 

mov rax, [some_symbol]

to refer to the memory pointed to by the symbol, or

mov rax, offset some_symbol

to refer to the address of the symbol.

This warning would be useful in standalone assembly files, and in GCC inline
assembly; for the latter I'd want to be able to plumb it through to a GCC
warning option.

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