[Bug fortran/63413] cpp trying to expand "vector" word in commented line in fortran file on power8

["burnus at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63413

Tobias Burnus <burnus at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |burnus at gcc dot gnu.org

--- Comment #3 from Tobias Burnus <burnus at gcc dot gnu.org> ---
By the way,
  cpp -dM </dev/null
shows all predefined macros - there should be also a definition for 'vector', I
presume. (On my system, there isn't.)

You could try processing the file with "-undef", which should drastically
reduce the number of defines.

OR, looking at the code below, you could try: -std= (such as "c90", cf. "man
cpp"), which seems to disable the "vector" expansion.



What's missing is a proper Fortran support in libcpp, which is able to handle
Fortran comments etc. That's tracked, e.g., in PR 28662.

* * *

Code wise, it comes from the following code in gcc/config/spu/spu-c.c:

  if (!flag_iso)
    {
      /* Define this when supporting context-sensitive keywords.  */
      cpp_define (pfile, "__VECTOR_KEYWORD_SUPPORTED__");
      cpp_define (pfile, "vector=vector");

      /* Initialize vector keywords.  */
      __vector_keyword = get_identifier ("__vector");
      C_CPP_HASHNODE (__vector_keyword)->flags |= NODE_CONDITIONAL;
      vector_keyword = get_identifier ("vector");
      C_CPP_HASHNODE (vector_keyword)->flags |= NODE_CONDITIONAL;

      /* Enable context-sensitive macros.  */
      cpp_get_callbacks (pfile)->macro_to_expand = spu_macro_to_expand;
    }