[C++ Patch] Locations related grokdeclarator tweak

[Paolo Carlini <paolo.carlini@oracle.com>]

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Hi,

a tweak to typespec_loc, where the existing conditional turns out to be 
just a special case of the full min_location that we want in order to do 
the right thing for testcases like diagnostic/trailing1.C. Tested 
x86_64-linux.

Thanks, Paolo.

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/cp
2018-01-18  Paolo Carlini  <paolo.carlini@oracle.com>

	* decl.c (grokdeclarator): Fix value assigned to typespec_loc, use
	min_location.

/testsuite
2018-01-18  Paolo Carlini  <paolo.carlini@oracle.com>

	* g++.dg/diagnostic/trailing1.C: New.

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Index: cp/decl.c
===================================================================
--- cp/decl.c	(revision 268062)
+++ cp/decl.c	(working copy)
@@ -10341,9 +10341,9 @@ grokdeclarator (const cp_declarator *declarator,
 
   location_t typespec_loc = smallest_type_quals_location (type_quals,
 						      declspecs->locations);
+  typespec_loc = min_location (typespec_loc,
+			       declspecs->locations[ds_type_spec]);
   if (typespec_loc == UNKNOWN_LOCATION)
-    typespec_loc = declspecs->locations[ds_type_spec];
-  if (typespec_loc == UNKNOWN_LOCATION)
     typespec_loc = input_location;
 
   /* Look inside a declarator for the name being declared
Index: testsuite/g++.dg/diagnostic/trailing1.C
===================================================================
--- testsuite/g++.dg/diagnostic/trailing1.C	(nonexistent)
+++ testsuite/g++.dg/diagnostic/trailing1.C	(working copy)
@@ -0,0 +1,5 @@
+// { dg-do compile { target c++11 } }
+
+int const foo1() -> double;  // { dg-error "1:.foo1. function with trailing return type" }
+int volatile foo2() -> double;  // { dg-error "1:.foo2. function with trailing return type" }
+int const volatile foo3() -> double;  // { dg-error "1:.foo3. function with trailing return type" }