[Cocci] Using a macro for variable attributes

[Paul Chaignon <paul@cilium.io>]

Hi all,

I am working on a small semantic patch to annotate specific variables in
our codebase with __attribute__((aligned(8))). The following program works
fine.

  @r@
  expression e1, e2;
  identifier x;
  @@
  (
    struct \(icmphdr\|icmp6hdr\) x
  + __attribute__((aligned(8)))
    ;
  |
    struct \(icmphdr\|icmp6hdr\) x
  + __attribute__((aligned(8)))
    = ...;
  )
    ... when exists
    ctx_load_bytes(e1, e2, &x, ...)

However, when I replace __attribute__((aligned(8))) with our internal
macro __align_stack_8, it fails with the following error:

  plus: parse error:
    File "/home/paul/cilium/contrib/coccinelle/aligned.cocci", line 7, column 2, charpos = 77
    around = '__align_stack_8',
    whole content = + __align_stack_8

I've tried adding '#define __align_stack_8' in a file passed with
--macro-file, without success. Is this a known limitation for macros or
am I missing something?

Thanks,
Paul
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