Supress Vc warnings when using Clang compiler

Suppressing -Wall is not enough to avoid -Wconditional-uninitialized
warnings from Vc with Clang, so we need to suppress this one explicitly.

math/mathcore/inc/Math/Types.h

@@ -6,6 +6,12 @@
 #ifdef R__HAS_VECCORE
 
 #if defined(R__HAS_VC)
+
+#ifdef __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wconditional-uninitialized"
+#endif
+
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wall"
 #pragma GCC diagnostic ignored "-Wunused-parameter"
@@ -13,6 +19,10 @@
 #pragma GCC diagnostic pop
 #endif
 
+#ifdef __clang__
+#pragma clang diagnostic pop
+#endif
+
 #include <VecCore/VecCore>
 
 namespace ROOT {

test/testVc.cxx

@@ -21,6 +21,11 @@
 
 */
 
+#ifdef __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wconditional-uninitialized"
+#endif
+
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wall"
 #pragma GCC diagnostic ignored "-Wunused-parameter"
@@ -28,6 +33,10 @@
 #include <Vc/IO>
 #pragma GCC diagnostic pop
 
+#ifdef __clang__
+#pragma clang diagnostic pop
+#endif
+
 #include <iostream>
 #include <iomanip>