[C++] Add casts to obstack_base calls

The recent libiberty import of upstream obstack.h (314dee8ea9) makes
obstack_base return a 'void *', with the consequence that a few places
in gdb need a (char *) cast.

gdb/ChangeLog:
2015-11-18  Simon Marchi  <simon.marchi@ericsson.com>
	    Pedro Alves  <palves@redhat.com>

	* break-catch-sig.c (signal_catchpoint_print_one): Add cast.
	* c-exp.y (parse_string_or_char, yylex): Add casts.
	* c-lang.c (evaluate_subexp_c): Add casts.
	* d-exp.y (parse_string_or_char, yylex): Add casts.
	* go-exp.y (parse_string_or_char, build_packaged_name): Add casts.
	* p-valprint.c (pascal_object_print_value_fields): Add casts.
	* valprint.c (generic_emit_char, generic_printstr): Add casts.

gdb/ChangeLog

@@ -1,3 +1,14 @@
+2015-11-18  Simon Marchi  <simon.marchi@ericsson.com>
+	    Pedro Alves  <palves@redhat.com>
+
+	* break-catch-sig.c (signal_catchpoint_print_one): Add cast.
+	* c-exp.y (parse_string_or_char, yylex): Add casts.
+	* c-lang.c (evaluate_subexp_c): Add casts.
+	* d-exp.y (parse_string_or_char, yylex): Add casts.
+	* go-exp.y (parse_string_or_char, build_packaged_name): Add casts.
+	* p-valprint.c (pascal_object_print_value_fields): Add casts.
+	* valprint.c (generic_emit_char, generic_printstr): Add casts.
+
 2015-11-18  Simon Marchi  <simon.marchi@ericsson.com>
 
 	* valops.c (value_cstring): Constify 'ptr' parameter.

gdb/break-catch-sig.c

@@ -279,7 +279,7 @@ signal_catchpoint_print_one (struct breakpoint *b,
 	  obstack_grow (&text, name, strlen (name));
         }
       obstack_grow (&text, "", 1);
-      ui_out_field_string (uiout, "what", obstack_base (&text));
+      ui_out_field_string (uiout, "what", (const char *) obstack_base (&text));
       do_cleanups (cleanup);
     }
   else

gdb/c-exp.y

@@ -2247,7 +2247,7 @@ parse_string_or_char (const char *tokptr, const char **outptr,
   ++tokptr;
 
   value->type = type;
-  value->ptr = obstack_base (&tempbuf);
+  value->ptr = (char *) obstack_base (&tempbuf);
   value->length = obstack_object_size (&tempbuf);
 
   *outptr = tokptr;
@@ -3173,7 +3173,7 @@ yylex (void)
 	  obstack_grow (&name_obstack, next->value.sval.ptr,
 			next->value.sval.length);
 
-	  yylval.sval.ptr = obstack_base (&name_obstack);
+	  yylval.sval.ptr = (const char *) obstack_base (&name_obstack);
 	  yylval.sval.length = obstack_object_size (&name_obstack);
 	  current.value = yylval;
 	  current.token = classification;

gdb/c-lang.c

@@ -701,7 +701,7 @@ evaluate_subexp_c (struct type *expect_type, struct expression *exp,
 			obstack_object_size (&output));
 	      }
 	    else
-	      result = value_cstring (obstack_base (&output),
+	      result = value_cstring ((const char *) obstack_base (&output),
 				      obstack_object_size (&output),
 				      type);
 	  }

gdb/d-exp.y

@@ -1005,7 +1005,7 @@ parse_string_or_char (const char *tokptr, const char **outptr,
   else
     value->type = C_STRING;
 
-  value->ptr = obstack_base (&tempbuf);
+  value->ptr = (char *) obstack_base (&tempbuf);
   value->length = obstack_object_size (&tempbuf);
 
   *outptr = tokptr;
@@ -1558,7 +1558,7 @@ yylex (void)
 	      obstack_grow (&name_obstack, next->value.sval.ptr,
 			    next->value.sval.length);
 
-	      yylval.sval.ptr = obstack_base (&name_obstack);
+	      yylval.sval.ptr = (char *) obstack_base (&name_obstack);
 	      yylval.sval.length = obstack_object_size (&name_obstack);
 
 	      current.token = classify_name (pstate, expression_context_block);
@@ -1638,7 +1638,7 @@ yylex (void)
 	  obstack_grow (&name_obstack, next->value.sval.ptr,
 			next->value.sval.length);
 
-	  yylval.sval.ptr = obstack_base (&name_obstack);
+	  yylval.sval.ptr = (char *) obstack_base (&name_obstack);
 	  yylval.sval.length = obstack_object_size (&name_obstack);
 	  current.value = yylval;
 	  current.token = classification;

gdb/go-exp.y

@@ -975,7 +975,7 @@ parse_string_or_char (const char *tokptr, const char **outptr,
   ++tokptr;
 
   value->type = C_STRING | (quote == '\'' ? C_CHAR : 0); /*FIXME*/
-  value->ptr = obstack_base (&tempbuf);
+  value->ptr = (char *) obstack_base (&tempbuf);
   value->length = obstack_object_size (&tempbuf);
 
   *outptr = tokptr;
@@ -1363,7 +1363,7 @@ build_packaged_name (const char *package, int package_len,
   obstack_grow_str (&name_obstack, ".");
   obstack_grow (&name_obstack, name, name_len);
   obstack_grow (&name_obstack, "", 1);
-  result.ptr = obstack_base (&name_obstack);
+  result.ptr = (char *) obstack_base (&name_obstack);
   result.length = obstack_object_size (&name_obstack) - 1;
 
   return result;

gdb/p-valprint.c

@@ -535,7 +535,8 @@ pascal_object_print_value_fields (struct type *type, const gdb_byte *valaddr,
 				  int dont_print_statmem)
 {
   int i, len, n_baseclasses;
-  char *last_dont_print = obstack_next_free (&dont_print_statmem_obstack);
+  char *last_dont_print
+    = (char *) obstack_next_free (&dont_print_statmem_obstack);
 
   type = check_typedef (type);
 

gdb/valprint.c

@@ -2362,7 +2362,7 @@ generic_emit_char (int c, struct type *type, struct ui_file *stream,
 			     sizeof (gdb_wchar_t), &output, translit_char);
   obstack_1grow (&output, '\0');
 
-  fputs_filtered (obstack_base (&output), stream);
+  fputs_filtered ((const char *) obstack_base (&output), stream);
 
   do_cleanups (cleanups);
 }
@@ -2717,7 +2717,7 @@ generic_printstr (struct ui_file *stream, struct type *type,
 			     sizeof (gdb_wchar_t), &output, translit_char);
   obstack_1grow (&output, '\0');
 
-  fputs_filtered (obstack_base (&output), stream);
+  fputs_filtered ((const char *) obstack_base (&output), stream);
 
   do_cleanups (cleanup);
 }