Go patch committed: Mark structs to use structural equality

[Ian Lance Taylor <iant at golang dot org>]

The Go frontend relies on the ability to convert from one struct type
to another, which it does using VIEW_CONVERT_EXPR.  For complete type
safety doing this we need to mark struct types as using structural
equality, which we were not doing.  We mostly got away with this, but
https://golang.org/issue/23667 shows a case where that fails (many
test failures were caused by a single miscompilation in the library).
This patch changes the Go frontend to GCC interface to mark structs as
using structural equality.  Bootstrapped and ran Go testsuite on
x86_64-pc-linux-gnu and powerpc64le-unknown-linux-gnu.  Committed to
mainline.

Ian


2018-02-03  Ian Lance Taylor  <iant@golang.org>

* go-gcc.cc (Gcc_backend::fill_in_struct): Mark struct types as
using structural equality.

Attachment: patch.txt
Description: Text document