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re PR c++/5748 (g++ dies with optimization)

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PR c++/5748
	* stmt.c (expand_anon_union_decl): Set TREE_USED on the anon union
	decl if any of elements was TREE_USED.

	* g++.dg/opt/anonunion1.C: New test.

From-SVN: r49971
This commit is contained in:
Jakub Jelinek 2002-02-22 22:09:09 +01:00 • committed by Jakub Jelinek
parent 9e0625a316
commit 3256b817fc
4 changed files with 40 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2002-02-22 Jakub Jelinek <jakub@redhat.com>
PR c++/5748
* stmt.c (expand_anon_union_decl): Set TREE_USED on the anon union
decl if any of elements was TREE_USED.
2002-02-22 Alexandre Oliva <aoliva@redhat.com>
* config/sparc/sol2.h: Don't include sys/mman.h.

5
gcc/stmt.c
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@ -4201,6 +4201,11 @@ expand_anon_union_decl (decl, cleanup, decl_elts)
tree cleanup_elt = TREE_PURPOSE (t);
enum machine_mode mode = TYPE_MODE (TREE_TYPE (decl_elt));
/* If any of the elements are addressable, so is the entire
union. */
if (TREE_USED (decl_elt))
TREE_USED (decl) = 1;
/* Propagate the union's alignment to the elements. */
DECL_ALIGN (decl_elt) = DECL_ALIGN (decl);
DECL_USER_ALIGN (decl_elt) = DECL_USER_ALIGN (decl);

4
gcc/testsuite/ChangeLog
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@ -1,3 +1,7 @@
2002-02-22 Jakub Jelinek <jakub@redhat.com>
* g++.dg/opt/anonunion1.C: New test.
2002-02-22 Nathan Sidwell <nathan@codesourcery.com>
* g++.dg/template/qualttp19.C: New test.

25
gcc/testsuite/g++.dg/opt/anonunion1.C Normal file
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@ -0,0 +1,25 @@
// PR c++/5748
// This testcase ICEd because used flag from the anon union variables
// was not propagated back to the anon union itself, causing addressof
// not to be replaced with stack slot.
// { dg-do compile }
// { dg-options "-O2" }
struct A {
A ();
~A ();
int foo ();
int bar (void *x, int y);
};
int A::foo()
{
union {
int a;
int b;
};
if (bar (&a, sizeof (int)) != 32)
return 16;
return 0;
}