From 9de8fb9a675e3df7e15f153e7c880eaafdfc6af4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vladim=C3=ADr=20Vondru=C5=A1?= <mosra@centrum.cz>
Date: Sat, 7 Jan 2017 18:53:47 +0100
Subject: [PATCH] Math: expect minor sRGB monotonicity test failure on
 Emscripten -O3 build.

The debug output isn't even able to print the difference as it is
differing *very* little.
---
 src/Magnum/Math/Test/ColorTest.cpp | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/Magnum/Math/Test/ColorTest.cpp b/src/Magnum/Math/Test/ColorTest.cpp
index bef29727e..0841ac155 100644
--- a/src/Magnum/Math/Test/ColorTest.cpp
+++ b/src/Magnum/Math/Test/ColorTest.cpp
@@ -634,7 +634,15 @@ void ColorTest::srgbMonotonic() {
     Color3 rgb = Color3::fromSrgb(Math::Vector3<UnsignedShort>(testCaseRepeatId() + 1));
     CORRADE_COMPARE_AS(rgb, rgbPrevious, Corrade::TestSuite::Compare::Greater);
     CORRADE_COMPARE_AS(rgb, Color3(0.0f), Corrade::TestSuite::Compare::GreaterOrEqual);
-    CORRADE_COMPARE_AS(rgb, Color3(1.0f), Corrade::TestSuite::Compare::LessOrEqual);
+    {
+        #ifdef CORRADE_TARGET_EMSCRIPTEN
+        CORRADE_EXPECT_FAIL_IF(testCaseRepeatId() == 65534 && !!(rgb > Color3(1.0f)),
+            "Some minor rounding error possibly due to some Esmcripten "
+            "optimizations. Happens only on larger optimization levels, not "
+            "on -O1.");
+        #endif
+        CORRADE_COMPARE_AS(rgb, Color3(1.0f), Corrade::TestSuite::Compare::LessOrEqual);
+    }
 }
 
 void ColorTest::srgbLiterals() {