doc/go1.15: document toolchain changes
Updates #37419.
Change-Id: I403cb12083d37359187b45c392046f307054a5b8
Reviewed-on: https://go-review.googlesource.com/c/go/+/236618
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: David Chase <drchase@google.com>
diff --git a/doc/go1.15.html b/doc/go1.15.html
index e376379..19f124a 100644
--- a/doc/go1.15.html
+++ b/doc/go1.15.html
@@ -55,6 +55,13 @@
on Windows.
</p>
+<p><!-- CL 227003 -->
+ The <code>-race</code> and <code>-msan</code> flags now always
+ enable <code>-d=checkptr</code>, which checks uses
+ of <code>unsafe.Pointer</code>. This was previously the case on all
+ OSes except Windows.
+</p>
+
<p><!-- CL 211139 -->
Go-built DLLs no longer cause the process to exit when it receives a
signal (such as Ctrl-C at a terminal).
@@ -245,6 +252,15 @@
aggressively eliminating unused type metadata.
</p>
+<p><!-- CL 219357, CL 231600 -->
+ The toolchain now mitigates
+ <a href="https://www.intel.com/content/www/us/en/support/articles/000055650/processors.html">Intel
+ CPU erratum SKX102</a> on <code>GOARCH=amd64</code> by aligning
+ functions to 32 byte boundaries and padding jump instructions. While
+ this padding increases binary sizes, this is more than made up for
+ by the binary size improvements mentioned above.
+</p>
+
<p><!-- CL 222661 -->
Go 1.15 adds a <code>-spectre</code> flag to both the
compiler and the assembler, to allow enabling Spectre mitigations.
@@ -253,6 +269,19 @@
See the <a href="https://github.com/golang/go/wiki/Spectre">Spectre wiki page</a> for details.
</p>
+<p><!-- CL 228578 -->
+ The compiler now rejects <code>//go:</code> compiler directives that
+ have no meaning for the declaration they are applied to with a
+ "misplaced compiler directive" error. Such misapplied directives
+ were broken before, but were silently ignored by the compiler.
+</p>
+
+<p><!-- CL 206658, CL 205066 -->
+ The compiler's <code>-json</code> optimization logging now reports
+ large (>= 128 byte) copies and includes explanations of escape
+ analysis decisions.
+</p>
+
<h2 id="linker">Linker</h2>
<p>
@@ -283,6 +312,14 @@
improvements expected in future releases.
</p>
+<h2 id="objdump">Objdump</h2>
+
+<p><!-- CL 225459 -->
+ The <a href="/cmd/objdump/">objdump</a> tool now supports
+ disassembling in GNU assembler syntax with the <code>-gnu</code>
+ flag.
+</p>
+
<h2 id="library">Core library</h2>
<h3 id="time/tzdata">New embedded tzdata package</h3>
