diff -Naur a/mkspecs/common/msvc-version.conf b/mkspecs/common/msvc-version.conf
--- a/mkspecs/common/msvc-version.conf	2018-06-15 03:29:31.000000000 -0400
+++ b/mkspecs/common/msvc-version.conf	2018-08-23 00:26:46.436806400 -0400
@@ -112,4 +112,11 @@
     COMPAT_MKSPEC       =
 }
 
+
+# MSVC 2017 15.8+ fixed std::aligned_storage but compilation fails without
+# this flag since the fix breaks binary compatibility.
+greaterThan(QMAKE_MSC_VER, 1914) {
+    DEFINES += _ENABLE_EXTENDED_ALIGNED_STORAGE
+}
+
 !isEmpty(COMPAT_MKSPEC):!$$COMPAT_MKSPEC: CONFIG += $$COMPAT_MKSPEC
diff -Naur a/qmake/Makefile.win32 b/qmake/Makefile.win32
--- a/qmake/Makefile.win32	2018-06-15 03:29:31.000000000 -0400
+++ b/qmake/Makefile.win32	2018-08-23 00:27:45.764849600 -0400
@@ -39,7 +39,7 @@
               -D_CRT_SECURE_NO_WARNINGS -D_SCL_SECURE_NO_WARNINGS \
               -DQT_VERSION_STR=\"$(QT_VERSION)\" -DQT_VERSION_MAJOR=$(QT_MAJOR_VERSION) -DQT_VERSION_MINOR=$(QT_MINOR_VERSION) -DQT_VERSION_PATCH=$(QT_PATCH_VERSION) \
               -DQT_BUILD_QMAKE -DQT_BOOTSTRAPPED -DPROEVALUATOR_FULL \
-              -DQT_NO_FOREACH -DUNICODE
+              -DQT_NO_FOREACH -DUNICODE -D_ENABLE_EXTENDED_ALIGNED_STORAGE
 CFLAGS   = $(CFLAGS_PCH) $(CFLAGS_BARE) $(CFLAGS)
 
 CXXFLAGS_BARE = $(CFLAGS_BARE)