[patch] Shorten Windows path

[Ian Lance Taylor]

On Tue, Mar 25, 2014 at 1:58 AM, Joey Ye <joey.ye@arm.com> wrote:
> Ping

This code looks different on mainline.

Writing "if ( do_canonical )" is not GCC style.

This patch does not respect the configure option
--disable-canonical-system-headers.

Also I personally don't actually know what the consequences would be.
Are there any downsides to canonicalizing header names?

Ian


>> -----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)
>
>