Adapt and integrate string_view tests

The previous patch copied the string_view tests from libstdc++.  This
patch adjusts them in a similar way that the libstdc++ optional tests
are integrated in our unit test suite.

Not all tests are used, some of them require language features not
present in c++11.  For example, we can't use a string_view constructor
where the length is not explicit in a constexpr, because
std::char_traits::length is not a constexpr itself (it is in c++17
though).  Nevertheless, a good number of tests are integrated, which
covers pretty well the string_view features.

gdb/ChangeLog:

	* Makefile.in (SUBDIR_UNITTESTS_SRCS): Add
	string_view-selftests.c.
	* unittests/basic_string_view/capacity/1.cc: Adapt to GDB
	testsuite.
	* unittests/basic_string_view/cons/char/1.cc: Likewise.
	* unittests/basic_string_view/cons/char/2.cc: Likewise.
	* unittests/basic_string_view/cons/char/3.cc: Likewise.
	* unittests/basic_string_view/element_access/char/1.cc:
	Likewise.
	* unittests/basic_string_view/element_access/char/empty.cc:
	Likewise.
	* unittests/basic_string_view/element_access/char/front_back.cc:
	Likewise.
	* unittests/basic_string_view/inserters/char/2.cc: Likewise.
	* unittests/basic_string_view/modifiers/remove_prefix/char/1.cc:
	Likewise.
	* unittests/basic_string_view/modifiers/remove_suffix/char/1.cc:
	Likewise.
	* unittests/basic_string_view/modifiers/swap/char/1.cc:
	Likewise.
	* unittests/basic_string_view/operations/compare/char/1.cc:
	Likewise.
	* unittests/basic_string_view/operations/compare/char/13650.cc:
	Likewise.
	* unittests/basic_string_view/operations/copy/char/1.cc:
	Likewise.
	* unittests/basic_string_view/operations/data/char/1.cc:
	Likewise.
	* unittests/basic_string_view/operations/find/char/1.cc:
	Likewise.
	* unittests/basic_string_view/operations/find/char/2.cc:
	Likewise.
	* unittests/basic_string_view/operations/find/char/3.cc:
	Likewise.
	* unittests/basic_string_view/operations/find/char/4.cc:
	Likewise.
	* unittests/basic_string_view/operations/rfind/char/1.cc:
	Likewise.
	* unittests/basic_string_view/operations/rfind/char/2.cc:
	Likewise.
	* unittests/basic_string_view/operations/rfind/char/3.cc:
	Likewise.
	* unittests/basic_string_view/operations/substr/char/1.cc:
	Likewise.
	* unittests/basic_string_view/operators/char/2.cc: Likewise.
	* unittests/string_view-selftests.c: New file.

1 files changed, 17 insertions, 7 deletions

diff --git a/gdb/unittests/basic_string_view/capacity/1.cc b/gdb/unittests/basic_string_view/capacity/1.cc
index d49ecbd..f297853 100644
--- a/gdb/unittests/basic_string_view/capacity/1.cc
+++ b/gdb/unittests/basic_string_view/capacity/1.cc
@@ -19,9 +19,7 @@
 
 // string_view size, length
 
-#include <string_view>
-#include <cstring>
-#include <testsuite_hooks.h>
+namespace capacity_1 {
 
 template<typename T>
   struct A { };
@@ -36,13 +34,19 @@ template<typename T>
 
 struct B { };
 
+} // namespace capacity_1
+} // namespace string_view
+} // namespace selftests
+
 // char_traits specialization
 namespace std
 {
   template<>
-    struct char_traits<A<B> >
+    struct char_traits<selftests::string_view::capacity_1::A<
+	selftests::string_view::capacity_1::B> >
     {
-      typedef A<B> 		char_type;
+      typedef selftests::string_view::capacity_1::A<
+	  selftests::string_view::capacity_1::B> char_type;
       // Unsigned as wint_t in unsigned.
       typedef unsigned long  	int_type;
       typedef streampos 	pos_type;
@@ -123,11 +127,15 @@ namespace std
     };
 } // namespace std
 
+namespace selftests {
+namespace string_view {
+namespace capacity_1 {
+
 void
 test01()
 {
-  std::basic_string_view<A<B>> str02;
-  typedef std::basic_string_view< A<B> >::size_type size_type_o;
+  gdb::basic_string_view<A<B>> str02;
+  typedef gdb::basic_string_view< A<B> >::size_type size_type_o;
   size_type_o sz03;
   size_type_o sz04;
 
@@ -160,3 +168,5 @@ main()
 
   return 0;
 }
+
+} // namespace capacity_1