*: remove lots of GCC 4.8 fallback code

We can remove those C++11 and C++14 kludges because we require GCC 4.9
now.

src/db/Helpers.cxx

@@ -46,19 +46,11 @@ StatsVisitTag(DatabaseStats &stats, StringSet &artists, StringSet &albums,
 	for (const auto &item : tag) {
 		switch (item.type) {
 		case TAG_ARTIST:
-#if CLANG_OR_GCC_VERSION(4,8)
 			artists.emplace(item.value);
-#else
-			artists.insert(item.value);
-#endif
 			break;
 
 		case TAG_ALBUM:
-#if CLANG_OR_GCC_VERSION(4,8)
 			albums.emplace(item.value);
-#else
-			albums.insert(item.value);
-#endif
 			break;
 
 		default:

src/db/plugins/upnp/UpnpDatabasePlugin.cxx

@@ -625,11 +625,7 @@ UpnpDatabase::VisitUniqueTags(const DatabaseSelection &selection,
 
 			const char *value = dirent.tag.GetValue(tag);
 			if (value != nullptr) {
-#if CLANG_OR_GCC_VERSION(4,8)
 				values.emplace(value);
-#else
-				values.insert(value);
-#endif
 			}
 		}
 	}

src/neighbor/plugins/SmbclientNeighborPlugin.cxx

@@ -212,14 +212,7 @@ SmbclientNeighborExplorer::Run()
 			prev = i;
 		} else {
 			/* can't see it anymore: move to "lost" */
-#if CLANG_OR_GCC_VERSION(4,7)
 			lost.splice_after(lost.before_begin(), list, prev);
-#else
-			/* the forward_list::splice_after() lvalue
-			   reference overload is missing in gcc 4.6 */
-			lost.emplace_front(std::move(*i));
-			list.erase_after(prev);
-#endif
 		}
 	}
 

src/output/plugins/httpd/HttpdInternal.hxx

@@ -158,10 +158,7 @@ public:
 	static HttpdOutput *Create(EventLoop &event_loop,
 				   const ConfigBlock &block);
 
-#if CLANG_OR_GCC_VERSION(4,7)
-	constexpr
-#endif
-	static HttpdOutput *Cast(AudioOutput *ao) {
+	static constexpr HttpdOutput *Cast(AudioOutput *ao) {
 		return &ContainerCast(*ao, &HttpdOutput::base);
 	}
 

src/storage/CompositeStorage.cxx

@@ -130,13 +130,8 @@ CompositeStorage::Directory::Make(const char *uri)
 	Directory *directory = this;
 	while (*uri != 0) {
 		const std::string name = NextSegment(uri);
-#if CLANG_OR_GCC_VERSION(4,8)
 		auto i = directory->children.emplace(std::move(name),
 						     Directory());
-#else
-		auto i = directory->children.insert(std::make_pair(std::move(name),
-								   Directory()));
-#endif
 		directory = &i.first->second;
 	}
 

src/tag/Pool.cxx

@@ -90,10 +90,7 @@ calc_hash(TagType type, const char *p)
 	return hash ^ type;
 }
 
-#if CLANG_OR_GCC_VERSION(4,7)
-	constexpr
-#endif
-static inline TagPoolSlot *
+static inline constexpr TagPoolSlot *
 tag_item_to_slot(TagItem *item)
 {
 	return &ContainerCast(*item, &TagPoolSlot::item);

src/tag/Set.cxx

@@ -76,11 +76,7 @@ TagSet::InsertUnique(const Tag &src, TagType type, const char *value,
 	else
 		builder.AddItem(type, value);
 	CopyTagMask(builder, src, group_mask);
-#if CLANG_OR_GCC_VERSION(4,8)
 	emplace(builder.Commit());
-#else
-	insert(builder.Commit());
-#endif
 }
 
 bool

src/util/Alloc.cxx

@@ -76,8 +76,6 @@ xstrndup(const char *s, size_t n)
 	return p;
 }
 
-#if CLANG_OR_GCC_VERSION(4,7)
-
 template<typename... Args>
 static inline size_t
 FillLengths(size_t *lengths, const char *a, Args&&... args)
@@ -107,14 +105,11 @@ StringCat(char *p, const size_t *lengths, const char *a)
 	memcpy(p, a, *lengths);
 }
 
-#endif
-
 template<typename... Args>
 gcc_malloc gcc_nonnull_all
 static inline char *
 t_xstrcatdup(Args&&... args)
 {
-#if CLANG_OR_GCC_VERSION(4,7)
 	constexpr size_t n = sizeof...(args);
 
 	size_t lengths[n];
@@ -124,22 +119,6 @@ t_xstrcatdup(Args&&... args)
 	StringCat(p, lengths, args...);
 	p[total] = 0;
 	return p;
-#else
-	/* fallback implementation for gcc 4.6, because that old
-	   compiler is too buggy to compile the above template
-	   functions */
-	const char *const argv[] = { args... };
-
-	size_t total = 0;
-	for (auto i : argv)
-		total += strlen(i);
-
-	char *p = (char *)xalloc(total + 1), *q = p;
-	for (auto i : argv)
-		q = stpcpy(q, i);
-
-	return p;
-#endif
 }
 
 char *

src/util/Cast.hxx

@@ -84,10 +84,7 @@ ContainerAttributeOffset(const A C::*p)
  * Cast the given pointer to a struct member to its parent structure.
  */
 template<class C, class A>
-#if CLANG_OR_GCC_VERSION(4,7)
-constexpr
-#endif
-static inline C &
+static inline constexpr C &
 ContainerCast(A &a, A C::*member)
 {
 	return *OffsetCast<C, A>(&a, ContainerAttributeOffset<C, A>(member));
@@ -97,10 +94,7 @@ ContainerCast(A &a, A C::*member)
  * Cast the given pointer to a struct member to its parent structure.
  */
 template<class C, class A>
-#if CLANG_OR_GCC_VERSION(4,7)
-constexpr
-#endif
-static inline const C &
+static inline constexpr const C &
 ContainerCast(const A &a, A C::*member)
 {
 	return *OffsetCast<const C, const A>(&a, ContainerAttributeOffset<C, A>(member));