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[Bug preprocessor/63831] [5 Regression] r217292 causes segfaults with -MM


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63831

emsr at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #33949|0                           |1
        is obsolete|                            |
  Attachment #33952|0                           |1
        is obsolete|                            |

--- Comment #10 from emsr at gcc dot gnu.org ---
Created attachment 33958
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33958&action=edit
Add a callback for preprocessor pretty printing.

As noted, the real answer to prevent these preprocessor-only crashes is to
provide a callback that handles __has_attribute.

I don't know how "pretty" the output is - I figure we can address that later if
needs be.

But the crashing doesn't happen and we get output.

Testsuite is still running.
--------------------------------------------------

libcpp:

2014-11-13  Edward Smith-Rowland  <3dw4rd@verizon.net>

    * expr.c (parse_has_attribute): Only call pfile->cb.has_attribute
    if it is non-null.


gcc/c-family:

2014-11-13  Edward Smith-Rowland  <3dw4rd@verizon.net>

    * c-lex.c (cb_has_attribute): Remove old comment.
    * c-cppbuiltin.c (cb_has_attribute): New callback;
    (init_pp_output): Set it.


gcc/testsuite:

2014-11-13  Edward Smith-Rowland  <3dw4rd@verizon.net>

    * g++.dg/cpp1y/pr63831.C: New.
    * g++.dg/cpp1y/pr63831.h: New.


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