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Re: Building Emacs from a new MinGW environment

From: Dani Moncayo
Subject: Re: Building Emacs from a new MinGW environment
Date: Sat, 14 Sep 2013 17:42:28 +0200

> You need to step further down into init_callproc.  It should correctly
> initialize Vdata_directory here:
>   if (data_dir == 0)
>     {
>       Lisp_Object tem, tem1, srcdir;
>       srcdir = Fexpand_file_name (build_string ("../src/"),
>                                   build_string (PATH_DUMPLOADSEARCH));
>       tem = Fexpand_file_name (build_string ("GNU"), Vdata_directory);
>       tem1 = Ffile_exists_p (tem);
>       if (!NILP (Fequal (srcdir, Vinvocation_directory)) || NILP (tem1))
>         {
>           Lisp_Object newdir;
>           newdir = Fexpand_file_name (build_string ("../etc/"),
>                                       build_string (PATH_DUMPLOADSEARCH));
>           tem = Fexpand_file_name (build_string ("GNU"), newdir);
>           tem1 = Ffile_exists_p (tem);
>           if (!NILP (tem1))
>             Vdata_directory = newdir;  <<<<<<<<<<<<<<<<<<<<<<<<<<<<<
>         }
>     }

The sentence you marked doesn't get executed, because "NILP(tem1)" is 1.

> If that doesn't work, perhaps PATH_DUMPLOADSEARCH has the wrong value
> (it comes from src/epaths.h).

It's defined like this:
  #define PATH_DUMPLOADSEARCH "/home/dani/emacs/emacs.git/lisp"

Although that path doesn't have a literal "%emacs_dir%", I don't know
if it is correct, because it's relative to my MSYS (which is installed
in "c:\msys").

And BTW, looking at the file, I see many strings including a literal
"%emacs_dir%", e.g.:

I don't know if that is correct either.

> should not have any %emacs_dir% in it, then look at the value of 'tem'
> 3 lines above the line I marked:
>   (gdb) p tem
>   (gdb) xtype
>   (gdb) xstring

(gdb) p tem
$1 = 57503793
(gdb) xtype
Undefined command: "xtype".  Try "help".
(gdb) xstring
Undefined command: "xstring".  Try "help".

I glanced over etc/DEBUG, and saw this:

  Some GDB versions by default do not automatically load .gdbinit files
  in the directory where you invoke GDB.  With those versions of GDB,
  you will see a warning when GDB starts, like this:

    warning: File ".../src/.gdbinit" auto-loading has been declined by
your `auto-load safe-path' set to "$debugdir:$datadir/auto-load".

  There are several ways to overcome that difficulty, they are all
  described in the node "Auto-loading safe path" in the GDB user manual.

and after looking at that node in the GDB manual, I created a file
~/.gdbinit with this line:
  add-auto-load-safe-path C:\msys\home\dani

That removes the warning issued by gdb at startup, but the "xtype" and
"xstring" commands remain unknown to gdb.  What am I doing wrong?

> If the result of 'xstring' indeed shows the etc subdirectory of your
> Emacs source tree, then perhaps the trouble happens inside
> Ffile_exists_p: it should return non-nil in this case.  You can
> display its result:
>   (gdb) p tem1
>   (gdb) xtype
>   (gdb) xsymbol

Dani Moncayo

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