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From 64535f5eb9d8e71a9af6b22bc41b7746c86fa534 Mon Sep 17 00:00:00 2001
From: "Haelwenn (lanodan) Monnier" <contact@hacktivis.me>
Date: Sun, 7 Jun 2026 02:15:01 +0200
Subject: [PATCH qbe] emit: fix aliasing-breaking pointer dereference via union
Message-ID: <20260607002047.1519619-1-contact@hacktivis.me>
X-Archived-At: https://lists.sr.ht/~mpu/qbe/patches/69989
X-Upstream-Status: merged
emit.c:186:50: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
Bug: https://bugs.gentoo.org/976975
---
emit.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/emit.c b/emit.c
index 45a6e5a..0abb3f2 100644
--- a/emit.c
+++ b/emit.c
@@ -160,6 +160,7 @@ emitfin(FILE *f, char *sec[3])
Asmbits *b;
int lg, i;
union { int32_t i; float f; } u;
+ union { int64_t i; double f; } uu;
if (!stash)
return;
@@ -178,13 +179,13 @@ emitfin(FILE *f, char *sec[3])
"\n\t.quad %"PRId64
"\n\t.quad 0\n\n",
(int64_t)b->n);
- else if (lg == 3)
+ else if (lg == 3) {
+ uu.i = b->n;
fprintf(f,
"\n\t.quad %"PRId64
" /* %f */\n\n",
- (int64_t)b->n,
- *(double *)&b->n);
- else if (lg == 2) {
+ uu.i, uu.f);
+ } else if (lg == 2) {
u.i = b->n;
fprintf(f,
"\n\t.int %"PRId32
base-commit: c0818978acec60ebb6167fade60fb7012cbf20ca
--
2.52.0
|
