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re PR c++/70512 (ICE on valid code on x86_64-linux-gnu: canonical types differ for identical types)

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PR c++/70512
	* class.c (fixup_may_alias): New.
	(fixup_attribute_variants): Call it.

	* g++.dg/ext/attribute-may-alias-5.C: New.

From-SVN: r234768
This commit is contained in:
Nathan Sidwell 2016-04-05 23:47:21 +00:00 committed by Nathan Sidwell
parent d5a28db09e
commit c08d28acf8
4 changed files with 41 additions and 0 deletions
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6
gcc/cp/ChangeLog
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@ -1,3 +1,9 @@
2016-04-05 Nathan Sidwell <nathan@acm.org>
PR c++/70512
* class.c (fixup_may_alias): New.
(fixup_attribute_variants): Call it.
2016-04-05 Patrick Palka <ppalka@gcc.gnu.org>
PR c++/70452

21
gcc/cp/class.c
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@ -1978,6 +1978,21 @@ fixup_type_variants (tree t)
}
}
/* KLASS is a class that we're applying may_alias to after the body is
parsed. Fixup any POINTER_TO and REFERENCE_TO types. The
canonical type(s) will be implicitly updated. */
static void
fixup_may_alias (tree klass)
{
tree t;
for (t = TYPE_POINTER_TO (klass); t; t = TYPE_NEXT_PTR_TO (t))
TYPE_REF_CAN_ALIAS_ALL (t) = true;
for (t = TYPE_REFERENCE_TO (klass); t; t = TYPE_NEXT_REF_TO (t))
TYPE_REF_CAN_ALIAS_ALL (t) = true;
}
/* Early variant fixups: we apply attributes at the beginning of the class
definition, and we need to fix up any variants that have already been
made via elaborated-type-specifier so that check_qualified_type works. */
@ -1993,6 +2008,10 @@ fixup_attribute_variants (tree t)
tree attrs = TYPE_ATTRIBUTES (t);
unsigned align = TYPE_ALIGN (t);
bool user_align = TYPE_USER_ALIGN (t);
bool may_alias = lookup_attribute ("may_alias", attrs);
if (may_alias)
fixup_may_alias (t);
for (variants = TYPE_NEXT_VARIANT (t);
variants;
@ -2007,6 +2026,8 @@ fixup_attribute_variants (tree t)
else
TYPE_USER_ALIGN (variants) = user_align;
TYPE_ALIGN (variants) = valign;
if (may_alias)
fixup_may_alias (variants);
}
}

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2016-04-05 Nathan Sidwell <nathan@acm.org>
PR c++/70512
* g++.dg/ext/attribute-may-alias-5.C: New.
2016-04-05 Jakub Jelinek <jakub@redhat.com>
PR c++/70336

9
gcc/testsuite/g++.dg/ext/attribute-may-alias-5.C Normal file
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@ -0,0 +1,9 @@
// PR c++/70512
struct S
{
S& operator= (int)
{
return *this;
}
} __attribute__ ((__may_alias__));