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[release-branch.go1.15] doc/go1.15: mention 1.15.3 cgo restriction on empty structs

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For #40954

Change-Id: I6a30aed31a16e820817f4ca5c7f591222e922946
Reviewed-on: https://go-review.googlesource.com/c/go/+/277432
Trust: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
(cherry picked from commit 129bb1917b)
Reviewed-on: https://go-review.googlesource.com/c/go/+/278573
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
This commit is contained in:
Ian Lance Taylor 2020-12-11 19:10:00 -08:00
parent 9b955d2d3f
commit 069f9d96d1
1 changed files with 13 additions and 0 deletions
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doc/go1.15.html
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@ -397,6 +397,19 @@ Do not send CLs removing the interior tags from such phrases.
documentation</a> for more information.
</p>
<p><!-- CL 250940 -->
In Go 1.15.3 and later, cgo will not permit Go code to allocate an
undefined struct type (a C struct defined as just <code>struct
S;</code> or similar) on the stack or heap.
Go code will only be permitted to use pointers to those types.
Allocating an instance of such a struct and passing a pointer, or a
full struct value, to C code was always unsafe and unlikely to work
correctly; it is now forbidden.
The fix is to either rewrite the Go code to use only pointers, or to
ensure that the Go code sees the full definition of the struct by
including the appropriate C header file.
</p>
<h3 id="commonname">X.509 CommonName deprecation</h3>
<p><!-- CL 231379 -->