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games-arcade/jazz2: apply strict aliasing fix

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Closes: https://bugs.gentoo.org/940326
Signed-off-by: Petr Vaněk <arkamar@gentoo.org>
This commit is contained in:
Petr Vaněk
2024-10-01 10:44:21 +02:00
parent dc33fa0119
commit 0a662a6a35
2 changed files with 34 additions and 0 deletions
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33
games-arcade/jazz2/files/jazz2-2.8.0-strict-aliasing.patch Normal file
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@@ -0,0 +1,33 @@
From ac7e3bf7237c12ac5a43fef52d42d31779cd62f6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Petr=20Van=C4=9Bk?= <arkamar@atlas.cz>
Date: Mon, 30 Sep 2024 09:54:56 +0200
Subject: [PATCH] Use union for int-float type conversion
Union based type punning seems to be safer for int-float type conversion
as it works around strict aliasing rules, which improves portability.
PR: https://github.com/deathkiller/jazz2-native/pull/80
diff --git a/Sources/nCine/Base/Algorithms.cpp b/Sources/nCine/Base/Algorithms.cpp
index 99fa88bf..e7805fda 100644
--- a/Sources/nCine/Base/Algorithms.cpp
+++ b/Sources/nCine/Base/Algorithms.cpp
@@ -247,12 +247,16 @@ namespace nCine
static inline std::uint32_t as_uint32(const float x)
{
- return *(std::uint32_t*)&x;
+ union {float f; uint32_t i;} u;
+ u.f = x;
+ return u.i;
}
static inline float as_float(const std::uint32_t x)
{
- return *(float*)&x;
+ union {float f; uint32_t i;} u;
+ u.i = x;
+ return u.f;
}
float halfToFloat(std::uint16_t value)

1
games-arcade/jazz2/jazz2-2.8.0.ebuild → games-arcade/jazz2/jazz2-2.8.0-r1.ebuild
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@@ -34,6 +34,7 @@ RDEPEND="${DEPEND}"
PATCHES=(
"${FILESDIR}/${P}-about-section.patch"
"${FILESDIR}/${P}-strict-aliasing.patch" #940326
)
src_prepare() {