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[release-branch.go1.15] doc/go1.15: mention 1.15.3 cgo restriction on empty structs
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>
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@ -397,6 +397,19 @@ Do not send CLs removing the interior tags from such phrases.
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documentation</a> for more information.
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</p>
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<p><!-- CL 250940 -->
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In Go 1.15.3 and later, cgo will not permit Go code to allocate an
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undefined struct type (a C struct defined as just <code>struct
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S;</code> or similar) on the stack or heap.
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Go code will only be permitted to use pointers to those types.
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Allocating an instance of such a struct and passing a pointer, or a
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full struct value, to C code was always unsafe and unlikely to work
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correctly; it is now forbidden.
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The fix is to either rewrite the Go code to use only pointers, or to
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ensure that the Go code sees the full definition of the struct by
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including the appropriate C header file.
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</p>
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<h3 id="commonname">X.509 CommonName deprecation</h3>
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<p><!-- CL 231379 -->
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