workaround for building on x86_64: disable SSE

SSE appears to cause cyclic header dependency when building C++ std module.

This needs investigation and an upstream fix.

Author: lhoward

classes/swift-common.bbclass

@@ -3,3 +3,11 @@ TOOLCHAIN = "gcc"
 
 # appears to cause segfault
 TARGET_CC_ARCH:remove:aarch64 = "-mbranch-protection=standard"
+
+# workaround for building on x86_64: SSE appears to cause cyclic header
+# dependency when building C++ std module. This needs investigation and an
+# upstream fix
+TARGET_CC_ARCH:remove:x86-64 = "-march=core2"
+TARGET_CC_ARCH:remove:x86-64 = "-mtune=core2"
+TARGET_CC_ARCH:remove:x86-64 = "-msse3"
+TARGET_CC_ARCH:remove:x86-64 = "-mfpmath=sse"