From b09812daf72afae4b07526c9398a1c5f5ce90d57 Mon Sep 17 00:00:00 2001
From: Ulf Hermann <ulf.hermann@qt.io>
Date: Thu, 6 May 2021 10:45:19 +0200
Subject: Workaround mingw compiler bug

std::acosh(v) wrongly returns NaN for v == Inf on mingw. This makes the
ecmascript tests fail.

Fixes: QTBUG-93175
Change-Id: Ic6677b3259dad591b946b23d4d6a6859f6e70b0f
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Reviewed-by: Maximilian Goldstein <max.goldstein@qt.io>
Reviewed-by: Andrei Golubev <andrei.golubev@qt.io>
(cherry picked from commit 3a8c0fd5cb9bfec439c306593bce19f434c871ce)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
---
 src/qml/jsruntime/qv4mathobject.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/qml/jsruntime/qv4mathobject.cpp b/src/qml/jsruntime/qv4mathobject.cpp
index 382185657e..aad38339e4 100644
--- a/src/qml/jsruntime/qv4mathobject.cpp
+++ b/src/qml/jsruntime/qv4mathobject.cpp
@@ -148,6 +148,11 @@ ReturnedValue MathObject::method_acosh(const FunctionObject *, const Value *, co
 #ifdef Q_OS_ANDROID // incomplete std :-(
     RETURN_RESULT(Encode(std::log(v +std::sqrt(v + 1) * std::sqrt(v - 1))));
 #else
+#ifdef Q_CC_MINGW
+    // Mingw has a broken std::acosh(). It returns NaN when passed Infinity.
+    if (std::isinf(v))
+        RETURN_RESULT(Encode(v));
+#endif
     RETURN_RESULT(Encode(std::acosh(v)));
 #endif
 }
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