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@@ -14,13 +14,13 @@ Do not send CLs removing the interior tags from such phrases.
main ul li { margin: 0.5em 0; }
</style>
-<h2 id="introduction">DRAFT RELEASE NOTES — Introduction to Go 1.17</h2>
+<h2 id="introduction">Introduction to Go 1.17</h2>
<p>
- <strong>
- Go 1.17 is not yet released. These are work-in-progress
- release notes. Go 1.17 is expected to be released in August 2021.
- </strong>
+ The latest Go release, version 1.17, arrives six months after <a href="/doc/go1.16">Go 1.16</a>.
+ Most of its changes are in the implementation of the toolchain, runtime, and libraries.
+ As always, the release maintains the Go 1 <a href="/doc/go1compat">promise of compatibility</a>.
+ We expect almost all Go programs to continue to compile and run as before.
</p>
<h2 id="language">Changes to the language</h2>
@@ -134,35 +134,54 @@ Do not send CLs removing the interior tags from such phrases.
<h3 id="go-command">Go command</h3>
-<h4 id="lazy-loading">Lazy module loading</h4>
+<a id="lazy-loading"><!-- for existing links only --></a>
+<h4 id="graph-pruning">Pruned module graphs in <code>go 1.17</code> modules</h4>
<p><!-- golang.org/issue/36460 -->
+ If a module specifies <code>go</code> <code>1.17</code> or higher, the module
+ graph includes only the <em>immediate</em> dependencies of
+ other <code>go</code> <code>1.17</code> modules, not their full transitive
+ dependencies. (See <a href="/ref/mod#graph-pruning">Module graph pruning</a>
+ for more detail.)
+</p>
+
+<p>
+ For the <code>go</code> command to correctly resolve transitive imports using
+ the pruned module graph, the <code>go.mod</code> file for each module needs to
+ include more detail about the transitive dependencies relevant to that module.
If a module specifies <code>go</code> <code>1.17</code> or higher in its
- <code>go.mod</code> file, its transitive requirements are now loaded lazily,
- avoiding the need to download or read <code>go.mod</code> files for
- otherwise-irrelevant dependencies. To support lazy loading, in Go 1.17 modules
- the <code>go</code> command maintains <em>explicit</em> requirements in
- the <code>go.mod</code> file for every dependency that provides any package
- transitively imported by any package or test within the module.
- See <a href="https://golang.org/design/36460-lazy-module-loading">the design
- document</a> for more detail.
- <!-- TODO(bcmills): replace the design-doc link with proper documentation. -->
+ <code>go.mod</code> file, its <code>go.mod</code> file now contains an
+ explicit <a href="/ref/mod#go-mod-file-require"><code>require</code>
+ directive</a> for every module that provides a transitively-imported package.
+ (In previous versions, the <code>go.mod</code> file typically only included
+ explicit requirements for <em>directly</em>-imported packages.)
+<p>
+
+<p>
+ Since the expanded <code>go.mod</code> file needed for module graph pruning
+ includes all of the dependencies needed to load the imports of any package in
+ the main module, if the main module specifies
+ <code>go</code> <code>1.17</code> or higher the <code>go</code> tool no longer
+ reads (or even downloads) <code>go.mod</code> files for dependencies if they
+ are not needed in order to complete the requested command.
+ (See <a href="/ref/mod#lazy-loading">Lazy loading</a>.)
</p>
<p><!-- golang.org/issue/45965 -->
- Because the number of additional explicit requirements in the go.mod file may
- be substantial, in a Go 1.17 module the newly-added requirements
- on <em>indirect</em> dependencies are maintained in a
- separate <code>require</code> block from the block containing direct
- dependencies.
+ Because the number of explicit requirements may be substantially larger in an
+ expanded Go 1.17 <code>go.mod</code> file, the newly-added requirements
+ on <em>indirect</em> dependencies in a <code>go</code> <code>1.17</code>
+ module are maintained in a separate <code>require</code> block from the block
+ containing direct dependencies.
</p>
<p><!-- golang.org/issue/45094 -->
- To facilitate the upgrade to lazy loading, the
- <code>go</code> <code>mod</code> <code>tidy</code> subcommand now supports
- a <code>-go</code> flag to set or change the <code>go</code> version in
- the <code>go.mod</code> file. To enable lazy loading for an existing module
- without changing the selected versions of its dependencies, run:
+ To facilitate the upgrade to Go 1.17 pruned module graphs, the
+ <a href="/ref/mod#go-mod-tidy"><code>go</code> <code>mod</code> <code>tidy</code></a>
+ subcommand now supports a <code>-go</code> flag to set or change
+ the <code>go</code> version in the <code>go.mod</code> file. To convert
+ the <code>go.mod</code> file for an existing module to Go 1.17 without
+ changing the selected versions of its dependencies, run:
</p>
<pre>
@@ -199,10 +218,10 @@ Do not send CLs removing the interior tags from such phrases.
</p>
<p><!-- golang.org/issue/46366 -->
- The <code>go</code> <code>mod</code> <code>graph</code> subcommand also
- supports the <code>-go</code> flag, which causes it to report the graph as
- seen by the indicated Go version, showing dependencies that may otherwise be
- pruned out by lazy loading.
+ The <a href="/ref/mod#go-mod-graph"><code>go</code> <code>mod</code> <code>graph</code></a>
+ subcommand also supports the <code>-go</code> flag, which causes it to report
+ the graph as seen by the indicated Go version, showing dependencies that may
+ otherwise be pruned out.
</p>
<h4 id="module-deprecation-comments">Module deprecation comments</h4>
@@ -270,7 +289,8 @@ Do not send CLs removing the interior tags from such phrases.
<p><!-- golang.org/issue/36876 -->
If the main module specifies <code>go</code> <code>1.17</code> or higher,
- <code>go</code> <code>mod</code> <code>vendor</code> now annotates
+ <a href="/ref/mod#go-mod-vendor"><code>go</code> <code>mod</code> <code>vendor</code></a>
+ now annotates
<code>vendor/modules.txt</code> with the <code>go</code> version indicated by
each vendored module in its own <code>go.mod</code> file. The annotated
version is used when building the module's packages from vendored source code.
@@ -468,6 +488,15 @@ func Foo() bool {
and compare functions by code pointer.
</p>
+<h3 id="link">Linker</h3>
+
+<p><!-- CL 310349 -->
+ When the linker uses external linking mode, which is the default
+ when linking a program that uses cgo, and the linker is invoked
+ with a <code>-I</code> option, the option will now be passed to the
+ external linker as a <code>-Wl,--dynamic-linker</code> option.
+</p>
+
<h2 id="library">Core library</h2>
<h3 id="runtime/cgo"><a href="/pkg/runtime/cgo">Cgo</a></h3>