[Bug preprocessor/59566] [4.8/4.9 regression] g++ preprocessor output includes comments meant for GNU C Library files

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59566

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2013-12-20
   Target Milestone|---                         |4.8.3
            Summary|[4.8 regression] g++        |[4.8/4.9 regression] g++
                   |preprocessor output         |preprocessor output
                   |includes comments meant for |includes comments meant for
                   |GNU C Library files         |GNU C Library files
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
You are using -C, so what do you expect?  Note that since 4.8.x GCC
automatically
includes stdc-predef.h (which you can see when you remove the -P option).  The
comment nicely explains in the last sentence:

/* This header is separate from features.h so that the compiler can
   include it implicitly at the start of every compilation.  It must
   not itself include <features.h> or any other header that includes
   <features.h> because the implicit include comes before any feature
   test macros that may be defined in a source file before it first
   explicitly includes a system header.  GCC knows the name of this
   header in order to preinclude it.  */

Thus, it works as designed. No?