Blame SOURCES/gcc11-pr105331.patch
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2022-04-21 Jakub Jelinek <jakub@redhat.com>
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PR target/105331
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* config/i386/i386.c (ix86_gimplify_va_arg): Mark va_arg_tmp
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temporary TREE_ADDRESSABLE before trying to gimplify ADDR_EXPR
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of it.
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* gcc.dg/pr105331.c: New test.
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--- gcc/config/i386/i386.c.jj 2022-04-12 09:20:07.566662842 +0200
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+++ gcc/config/i386/i386.c 2022-04-21 12:03:32.201951522 +0200
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@@ -4891,6 +4891,7 @@ ix86_gimplify_va_arg (tree valist, tree
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{
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int i, prev_size = 0;
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tree temp = create_tmp_var (type, "va_arg_tmp");
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+ TREE_ADDRESSABLE (temp) = 1;
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/* addr = &tem;; */
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t = build1 (ADDR_EXPR, build_pointer_type (type), temp);
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--- gcc/testsuite/gcc.dg/pr105331.c.jj 2022-04-21 12:09:34.398906718 +0200
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+++ gcc/testsuite/gcc.dg/pr105331.c 2022-04-21 12:09:07.304283903 +0200
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@@ -0,0 +1,11 @@
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+/* PR target/105331 */
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+/* { dg-do compile } */
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+/* { dg-options "-O -Wuninitialized" } */
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+
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+#include <stdarg.h>
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+
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+int
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+foo (va_list *va)
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+{
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+ return va_arg (*va, double _Complex); /* { dg-bogus "may be used uninitialized" } */
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+}
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