[Bug preprocessor/65852] Incorrect escaping in depfiles

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65852

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Here is what the comment says in the source:
/* Given a filename, quote characters in that filename which are
   significant to Make.  Note that it's not possible to quote all such
   characters - e.g. \n, %, *, ?, [, \ (in some contexts), and ~ are
   not properly handled.  It isn't possible to get this right in any
   current version of Make.  (??? Still true?  Old comment referred to
   3.76.1.)  */

So maybe there was an issue with make at one point.  Basically \ is not mungled
to be what it should be done.