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diff -up qt-everywhere-opensource-src-4.8.7/src/script/script.pro.gcc8 qt-everywhere-opensource-src-4.8.7/src/script/script.pro
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--- qt-everywhere-opensource-src-4.8.7/src/script/script.pro.gcc8	2015-05-07 09:14:43.000000000 -0500
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+++ qt-everywhere-opensource-src-4.8.7/src/script/script.pro	2018-05-19 16:01:24.699926959 -0500
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@@ -91,6 +91,9 @@ symbian {
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     TARGET.UID3=0x2001B2E1
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 }
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+# hack around gcc8 optimization bug with -O2
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+QMAKE_CXXFLAGS_RELEASE += -O1
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+
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 symbian {
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     symbian-abld|symbian-sbsv2 {
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         MMP_RULES += ALWAYS_BUILD_AS_ARM