qt: Force arm mode instead of Thumb1 mode

Qt has some assembly that doesn't exist in thumb1 mode.
So, force arm mode for Qt

Signed-off-by: Richard Genoud <richard.genoud@gmail.com>
Tested-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Acked-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/qt/qt.mk

@@ -52,6 +52,14 @@ endif
 
 endif
 
+# Qt has some assembly function that are not present in thumb1 mode:
+# Error: selected processor does not support Thumb mode `swp r3,r7,[r4]'
+# so, we desactivate thumb mode
+ifeq ($(BR2_ARM_INSTRUCTIONS_THUMB),y)
+QT_CFLAGS += -marm
+QT_CXXFLAGS += -marm
+endif
+
 ifeq ($(BR2_PACKAGE_QT_QT3SUPPORT),y)
 QT_CONFIGURE_OPTS += -qt3support
 else