content: add "Go 1.5 is released" article

Change-Id: Iba64aa52334522c6ece1cfa4a4c13566dd0a1324
Reviewed-on: https://go-review.googlesource.com/13665
Reviewed-by: Rob Pike <r@golang.org>

1 files changed, 77 insertions, 0 deletions

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+Go 1.5 is released
+19 Aug 2015
+
+Andrew Gerrand
+adg@golang.org
+
+* Introduction
+
+Today the Go project is proud to release Go 1.5,
+the sixth major stable release of Go.
+
+This release includes significant changes to the implementation.
+The compiler tool chain was [[https://golang.org/doc/go1.5#c][translated from C to Go]],
+removing the last vestiges of C code from the Go code base.
+The garbage collector was [[https://golang.org/doc/go1.5#gc][completely redesigned]],
+yielding a [[https://talks.golang.org/2015/go-gc.pdf][dramatic reduction]]
+in garbage collection pause times.
+Related improvements to the scheduler allowed us to change the default
+[[https://golang.org/pkg/runtime/#GOMAXPROCS][GOMAXPROCS]] value
+(the number of concurrently executing goroutines)
+from 1 to the number of logical CPUs.
+Changes to the linker enable distributing Go packages as shared libraries to
+link into Go programs, and building Go packages into archives or shared
+libraries that may be linked into or loaded by C programs
+([[https://golang.org/s/execmodes][design doc]]).
+
+The release also includes [[https://golang.org/doc/go1.5#go_command][improvements to the developer tools]].
+Support for [[https://golang.org/s/go14internal]["internal" packages]]
+permits sharing implementation details between packages.
+[[https://golang.org/s/go15vendor][Experimental support]] for "vendoring"
+external dependencies is a step toward a standard mechanism for managing
+dependencies in Go programs.
+The new "[[https://golang.org/cmd/trace/][go tool trace]]" command enables the
+visualisation of  program traces generated by new tracing infrastructure in the
+runtime.
+The new "[[https://golang.org/cmd/go/#hdr-Show_documentation_for_package_or_symbol][go doc]]"
+command provides an improved command-line interface for viewing Go package documentation.
+
+There are also several [[https://golang.org/doc/go1.5#ports][new operating system and architecture ports]].
+The more mature new ports are darwin/arm,
+darwin/arm64 (Apple's iPhone and iPad devices),
+and linux/arm64.
+There is also experimental support for ppc64 and ppc64le
+(IBM 64-bit PowerPC, big and little endian).
+
+The new darwin/arm64 port and external linking features fuel the
+[[https://godoc.org/golang.org/x/mobile][Go mobile project]], an experiment to
+see how Go might be used for building apps on Android and iOS devices.
+(The Go mobile work itself is not part of this release.)
+
+The only language change is very minor,
+[[https://golang.org/doc/go1.5#language][the lifting of a restriction in the map literal syntax]]
+to make them more succinct and consistent with slice literals.
+
+The standard library saw many additions and improvements, too.
+The flag package now shows [[https://golang.org/doc/go1.5#flag][cleaner usage messages]].
+The math/big package now provides a [[https://golang.org/pkg/math/big/#Float][Float]]
+type for computing with arbitrary-precision floating point numbers.
+An [[https://golang.org/doc/go1.5#net][improvement]] to the DNS resolver on
+Linux and BSD systems has removed the cgo requirement for programs that do name
+lookups.
+The [[https://golang.org/pkg/go/types/][go/types]] package has been
+[[https://golang.org/doc/go1.5#go_types][moved]] to the standard library from
+the [[https://godoc.org/golang.org/x/tools][golang.org/x/tools]] repository.
+(The new [[https://golang.org/pkg/go/constant/][go/constant]] and
+[[https://golang.org/pkg/go/importer/][go/importer]] packages are also a result
+of this move.)
+The reflect package has added the
+[[https://golang.org/pkg/reflect/#ArrayOf][ArrayOf]] and
+[[https://golang.org/pkg/reflect/#FuncOf][FuncOf]] functions, analogous to the
+existing [[https://golang.org/pkg/reflect/#SliceOf][SliceOf]] function.
+And, of course, there is the usual
+[[https://golang.org/doc/go1.5#minor_library_changes][list of smaller fixes and improvements]].
+
+For the full story, see the [[https://golang.org/doc/go1.5][detailed release notes]].
+Or if you just can't wait to get started,
+head over to the [[https://golang.org/dl/][downloads page]] to get Go 1.5 now.