[RFA] Fix issues with DOSish file names in symbol tables

["Eli Zaretskii" <eliz@is.elta.co.il>]

The following minor changes fix GDB handling of DOS-style file and
directory names recorded in the debug info.  The specific issues are:
the form of an absolute file name and the case-insensitive nature of
the underlying file system, which can leak into the debug info.

It seems like Jim Blandy and/or Elena need to approve this.

Okay to commit?

2001-04-28  Eli Zaretskii  <eliz@is.elta.co.il>

	* buildsym.c (start_subfile): Use FILENAME_CMP instead of STREQ.
	(top-level): #include filenames.h.

	* dwarf2read.c (dwarf2_start_subfile): Use IS_ABSOLUTE_PATH and
	FILENAME_CMP, to DTRT on non-Posix platforms.
	(top-level): #include filenames.h.

--- gdb/buildsym.c~0	Fri Dec 15 03:01:44 2000
+++ gdb/buildsym.c	Sat Apr 28 11:19:40 2001
@@ -37,6 +37,7 @@
 #include "expression.h"		/* For "enum exp_opcode" used by... */
 #include "language.h"		/* For "longest_local_hex_string_custom" */
 #include "bcache.h"
+#include "filenames.h"		/* For DOSish file names */
 /* Ask buildsym.h to define the vars it normally declares `extern'.  */
 #define	EXTERN
 /**/
@@ -531,7 +532,7 @@ start_subfile (char *name, char *dirname
 
   for (subfile = subfiles; subfile; subfile = subfile->next)
     {
-      if (STREQ (subfile->name, name))
+      if (FILENAME_CMP (subfile->name, name) == 0)
 	{
 	  current_subfile = subfile;
 	  return;
--- gdb/dwarf2read.c~0	Wed Jan 24 02:22:46 2001
+++ gdb/dwarf2read.c	Sat Apr 28 11:14:34 2001
@@ -35,6 +35,7 @@
 #include "buildsym.h"
 #include "demangle.h"
 #include "expression.h"
+#include "filenames.h"	/* for DOSish file names */
 
 #include "language.h"
 #include "complaints.h"
@@ -4058,14 +4059,14 @@ dwarf2_start_subfile (char *filename, ch
   /* If the filename isn't absolute, try to match an existing subfile
      with the full pathname.  */
 
-  if (*filename != '/' && dirname != NULL)
+  if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL)
     {
       struct subfile *subfile;
       char *fullname = concat (dirname, "/", filename, NULL);
 
       for (subfile = subfiles; subfile; subfile = subfile->next)
 	{
-	  if (STREQ (subfile->name, fullname))
+	  if (FILENAME_CMP (subfile->name, fullname) == 0)
 	    {
 	      current_subfile = subfile;
 	      xfree (fullname);