From dfbf09f4b936eaf6042fb0b2ab431eb986c330d2 Mon Sep 17 00:00:00 2001
From: Shauren <shauren.trinity@gmail.com>
Date: Mon, 17 Jul 2023 20:32:07 +0200
Subject: GCC build fix

---
 src/common/Utilities/advstd.h                      | 24 ++++++++++++++++++++++
 .../game/Entities/AreaTrigger/AreaTrigger.cpp      |  5 +++--
 2 files changed, 27 insertions(+), 2 deletions(-)

(limited to 'src')

diff --git a/src/common/Utilities/advstd.h b/src/common/Utilities/advstd.h
index 5b9991854bf..5bdfb52b533 100644
--- a/src/common/Utilities/advstd.h
+++ b/src/common/Utilities/advstd.h
@@ -18,6 +18,13 @@
 #ifndef TRINITY_ADVSTD_H
 #define TRINITY_ADVSTD_H
 
+#include <version>
+
+#ifdef __cpp_lib_bit_cast
+#include <bit>
+#else
+#include <cstring> // for memcpy
+#endif
 #include <compare>
 
 // this namespace holds implementations of upcoming stdlib features that our c++ version doesn't have yet
@@ -26,6 +33,23 @@ namespace advstd
 // libc++ is missing these two
 [[nodiscard]] constexpr bool is_eq(std::partial_ordering cmp) noexcept { return cmp == 0; }
 [[nodiscard]] constexpr bool is_neq(std::partial_ordering cmp) noexcept { return cmp != 0; }
+
+#ifdef __cpp_lib_bit_cast
+using std::bit_cast;
+#else
+// libstdc++ v10 is missing this
+template <typename To, typename From,
+    std::enable_if_t<std::conjunction_v<
+        std::bool_constant<sizeof(To) == sizeof(From)>,
+        std::is_trivially_copyable<To>,
+        std::is_trivially_copyable<From>>, int> = 0>
+[[nodiscard]] constexpr To bit_cast(From const& from) noexcept
+{
+    To to;
+    std::memcpy(&to, &from, sizeof(To));
+    return to;
+}
+#endif
 }
 
 #endif
diff --git a/src/server/game/Entities/AreaTrigger/AreaTrigger.cpp b/src/server/game/Entities/AreaTrigger/AreaTrigger.cpp
index 80a31903120..8bf33886a55 100644
--- a/src/server/game/Entities/AreaTrigger/AreaTrigger.cpp
+++ b/src/server/game/Entities/AreaTrigger/AreaTrigger.cpp
@@ -39,6 +39,7 @@
 #include "Transport.h"
 #include "Unit.h"
 #include "UpdateData.h"
+#include "advstd.h"
 #include <bit>
 
 AreaTrigger::AreaTrigger() : WorldObject(false), MapObject(), _spawnId(0), _aurEff(nullptr), _maxSearchRadius(0.0f),
@@ -364,7 +365,7 @@ float AreaTrigger::GetScaleCurveValue(UF::ScaleCurve const& scaleCurve, float x)
 
     // unpack ParameterCurve
     if (*scaleCurve.ParameterCurve & 1)
-        return std::bit_cast<float>(*scaleCurve.ParameterCurve & ~1);
+        return advstd::bit_cast<float>(*scaleCurve.ParameterCurve & ~1);
 
     std::array<DBCPosition2D, 2> points;
     for (std::size_t i = 0; i < scaleCurve.Points.size(); ++i)
@@ -394,7 +395,7 @@ void AreaTrigger::SetScaleCurve(UF::MutableFieldReference<UF::ScaleCurve, false>
 
     if (float const* simpleFloat = std::get_if<float>(&curve->Curve))
     {
-        uint32 packedCurve = std::bit_cast<uint32>(*simpleFloat);
+        uint32 packedCurve = advstd::bit_cast<uint32>(*simpleFloat);
         packedCurve |= 1;
 
         SetUpdateFieldValue(scaleCurveMutator.ModifyValue(&UF::ScaleCurve::ParameterCurve), packedCurve);
-- 
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