re PR other/5620 (GCC -save-temps foo.c fails to build foo.o)

	PR 5620
	* gcc.c (struct stat input_stat): Don't define if
	HOST_LACKS_INODE_NUMBERS
	(do_spec_1): If HOST_LACKS_INODE_NUMBERS, use lrealpath rather
	than stat to determine if temp file is same as input file.
	* doc/hostconfig.texi: Document HOST_LACKS_INODE_NUMBERS.
	* config/i386/xm-mingw32.h: Define HOST_LACKS_INODE_NUMBERS

From-SVN: r86311

gcc/ChangeLog

+2004-08-20  Danny Smith  <dannysmith@users.sourceforge.net>
+
+	PR 5620
+	* gcc.c (struct stat input_stat): Don't define if
+	HOST_LACKS_INODE_NUMBERS
+	(do_spec_1): If HOST_LACKS_INODE_NUMBERS, use lrealpath rather
+	than stat to determine if temp file is same as input file.
+	* doc/hostconfig.texi: Document HOST_LACKS_INODE_NUMBERS.
+	* config/i386/xm-mingw32.h: Define HOST_LACKS_INODE_NUMBERS
+
 2004-08-20  Richard Sandiford  <rsandifo@redhat.com>
 
 	* configure.ac (mips*-*-*): Print an error if not using GAS.

gcc/config/i386/xm-mingw32.h

@@ -27,3 +27,6 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA
 
 /* This is the name of the null device on windows.  */
 #define HOST_BIT_BUCKET "nul"
+
+/*  The st_ino field of struct stat is always 0.  */
+#define HOST_LACKS_INODE_NUMBERS

gcc/doc/hostconfig.texi

@@ -163,6 +163,10 @@ If you do not define this macro, GCC will use the default version. You
 should define this macro if the default version does not reliably remove
 the temp file as, for example, on VMS which allows multiple versions
 of a file.
+
+@item HOST_LACKS_INODE_NUMBERS
+Define this macro if the host filesystem does not report meaningful inode
+numbers in struct stat.
 @end ftable
 
 @node Host Misc

gcc/gcc.c

@@ -4195,7 +4195,9 @@ static int basename_length;
 static int suffixed_basename_length;
 static const char *input_basename;
 static const char *input_suffix;
+#ifndef HOST_LACKS_INODE_NUMBERS
 static struct stat input_stat;
+#endif
 static int input_stat_set;
 
 /* The compiler used to process the current input file.  */
@@ -4759,6 +4761,7 @@ do_spec_1 (const char *spec, int inswitch, const char *soft_matched_part)
 		    *((char *) temp_filename + temp_filename_length) = '\0';
 		    if (strcmp (temp_filename, input_filename) != 0)
 		      {
+#ifndef HOST_LACKS_INODE_NUMBERS
 			struct stat st_temp;
 
 			/* Note, set_input() resets input_stat_set to 0.  */
@@ -4773,11 +4776,19 @@ do_spec_1 (const char *spec, int inswitch, const char *soft_matched_part)
 			   and we can do the stat for the temp_filename
 			   then the they could still refer to the same
 			   file if st_dev/st_ino's are the same.  */
-
 			if (input_stat_set != 1
 			    || stat (temp_filename, &st_temp) < 0
 			    || input_stat.st_dev != st_temp.st_dev
 			    || input_stat.st_ino != st_temp.st_ino)
+#else
+			/* Just compare canonical pathnames.  */
+			char* input_realname = lrealpath (input_filename);
+			char* temp_realname = lrealpath (temp_filename);
+			bool files_differ = strcmp (input_realname, temp_realname);
+			free (input_realname);
+			free (temp_realname);
+			if (files_differ) 	
+#endif
 			  {
 			    temp_filename = save_string (temp_filename,
 							 temp_filename_length + 1);