Revert revision 217149 because it breaks Ada:

gcc/testsuite/ChangeLog:

2014-11-05  Anthony Brandon  <anthony.brandon@gmail.com>

        PR driver/36312
        * gcc.misc-tests/output.exp: New test case for identical input and
        output files.

include/ChangeLog:

2014-11-05  Anthony Brandon  <anthony.brandon@gmail.com>

        PR driver/36312
        * filenames.h: Add prototype for canonical_filename_eq.

gcc/ChangeLog:

2014-11-05  Anthony Brandon  <anthony.brandon@gmail.com>

        PR driver/36312
        * diagnostic-core.h: Add prototype for fatal_error.
        * diagnostic.c (fatal_error): New function fatal_error.
        * gcc.c (store_arg): Remove have_o_argbuf_index.
        (process_command): Check if input and output files are the same.
        * toplev.c (init_asm_output): Check if input and output files are
        the same.

libiberty/ChangeLog:

2014-11-05  Anthony Brandon  <anthony.brandon@gmail.com>

        PR driver/36312
        * filename_cmp.c (canonical_filename_eq): New function to check if
        file names are the same.
        * functions.texi: Updated with documentation for new function.

From-SVN: r217159

1 files changed, 7 insertions, 12 deletions

diff --git a/gcc/gcc.c b/gcc/gcc.c
index 6f144de..e013d52 100644
--- a/gcc/gcc.c
+++ b/gcc/gcc.c
@@ -1702,15 +1702,17 @@ typedef const char *const_char_p; /* For DEF_VEC_P.  */
 
 static vec<const_char_p> argbuf;
 
+/* Position in the argbuf vector containing the name of the output file
+   (the value associated with the "-o" flag).  */
+
+static int have_o_argbuf_index = 0;
+
 /* Were the options -c, -S or -E passed.  */
 static int have_c = 0;
 
 /* Was the option -o passed.  */
 static int have_o = 0;
 
-/* Pointer to output file name passed in with -o. */
-static const char *output_file = 0;
-
 /* This is the list of suffixes and codes (%g/%u/%U/%j) and the associated
    temp file.  If the HOST_BIT_BUCKET is used for %j, no entry is made for
    it here.  */
@@ -1760,6 +1762,8 @@ store_arg (const char *arg, int delete_always, int delete_failure)
 {
   argbuf.safe_push (arg);
 
+  if (strcmp (arg, "-o") == 0)
+    have_o_argbuf_index = argbuf.length ();
   if (delete_always || delete_failure)
     {
       const char *p;
@@ -3709,7 +3713,6 @@ driver_handle_option (struct gcc_options *opts,
 #if defined(HAVE_TARGET_EXECUTABLE_SUFFIX) || defined(HAVE_TARGET_OBJECT_SUFFIX)
       arg = convert_filename (arg, ! have_c, 0);
 #endif
-      output_file = arg;
       /* Save the output name in case -save-temps=obj was used.  */
       save_temps_prefix = xstrdup (arg);
       /* On some systems, ld cannot handle "-o" without a space.  So
@@ -4049,14 +4052,6 @@ process_command (unsigned int decoded_options_count,
 			   CL_DRIVER, &handlers, global_dc);
     }
 
-  if (output_file && strcmp (output_file, "-"))
-    {
-      int i;
-      for (i = 0; i < n_infiles; i++)
-	if (canonical_filename_eq (infiles[i].name, output_file))
-	  fatal_error ("output file %s is the same as input file", output_file);
-    }
-
   /* If -save-temps=obj and -o name, create the prefix to use for %b.
      Otherwise just make -save-temps=obj the same as -save-temps=cwd.  */
   if (save_temps_flag == SAVE_TEMPS_OBJ && save_temps_prefix != NULL)