[patch] Shorten Windows path

[Joey Ye]

Ping

> -----Original Message-----
> From: Joey Ye [mailto:joey.ye@arm.com]
> Sent: 19 February 2014 15:45
> To: gcc-patches@gcc.gnu.org; Ian Lance Taylor (iant@google.com)
> Subject: [patch] Shorten Windows path
> 
> Max length of path on Windows is 255, which is easy to exceed in a
> complicated project. Ultimate solution may be complex but canonizing the
> path and skipping the ".."s in path is helpful.
> 
> Relative discussion in gcc-patches:
> http://gcc.gnu.org/ml/gcc-patches/2013-11/msg00582.html
> 
> OK to trunk stage 1?
> 
> ChangeLog.libcpp:
>     * files.c (find_file_in_dir): Always try to shorten for DOS.
> 
> diff --git a/libcpp/files.c b/libcpp/files.c index 7e88778..9dcc71f 100644
> --- a/libcpp/files.c
> +++ b/libcpp/files.c
> @@ -386,9 +386,18 @@ find_file_in_dir (cpp_reader *pfile, _cpp_file *file,
> bool *invalid_pch)
>        hashval_t hv;
>        char *copy;
>        void **pp;
> +      bool do_canonical;
> 
> +#ifdef HAVE_DOS_BASED_FILE_SYSTEM
> +      /* For DOS based file system, we always try to shorten file path
> +       * to as it has a shorter constraint on max path length.  */
> +      do_canonical = true;
> +#else
>        /* We try to canonicalize system headers.  */
> -      if (CPP_OPTION (pfile, canonical_system_headers) &&
file->dir->sysp)
> +      do_canonical = (CPP_OPTION (pfile, canonical_system_headers)
> +                      && file->dir->sysp); #endif
> +      if ( do_canonical )
>  	{
>  	  char * canonical_path = maybe_shorter_path (path);
>  	  if (canonical_path)