Work around MSVC's lack of standard _Pragma support

CMakeLists.txt

@@ -199,7 +199,7 @@ IF(MSVC)
     IF(HAVE_PERMISSIVE_SWITCH)
         SET(C_FLAGS ${C_FLAGS} $<$<COMPILE_LANGUAGE:CXX>:/permissive->)
     ENDIF()
-    SET(C_FLAGS ${C_FLAGS} /W4 /w14640 /wd4065 /wd4200 /wd4268 /wd4324)
+    SET(C_FLAGS ${C_FLAGS} /W4 /w14640 /wd4065 /wd4268 /wd4324)
 
     IF(NOT DXSDK_DIR)
         STRING(REGEX REPLACE "\\\\" "/" DXSDK_DIR "$ENV{DXSDK_DIR}")

common/almalloc.h

@@ -12,19 +12,19 @@
 
 
 #ifdef _MSC_VER
-#define DIAGNOSTIC_PUSH _Pragma("warning(push)")
+#define DIAGNOSTIC_PUSH __pragma(warning(push))
 #define GNUDIAGNOSTIC(x)
-#define MVSDIAGNOSTIC(x) _Pragma(x)
-#define DIAGNOSTIC_POP _Pragma("warning(pop)")
+#define MVSDIAGNOSTIC(...) __pragma(__VA_ARGS__)
+#define DIAGNOSTIC_POP __pragma(warning(pop))
 #elif defined(__GNUC__) || defined(__clang__)
 #define DIAGNOSTIC_PUSH _Pragma("GCC diagnostic push")
 #define GNUDIAGNOSTIC(x) _Pragma(x)
-#define MVSDIAGNOSTIC(x)
+#define MVSDIAGNOSTIC(...)
 #define DIAGNOSTIC_POP _Pragma("GCC diagnostic push")
 #else
 #define DIAGNOSTIC_PUSH
 #define GNUDIAGNOSTIC(x)
-#define MVSDIAGNOSTIC(x)
+#define MVSDIAGNOSTIC(...)
 #define DIAGNOSTIC_POP
 #endif
 
@@ -113,7 +113,7 @@ inline T* assume_aligned(T *ptr) noexcept
  * destructor is trivial (a no-op). So disable that warning for this call.
  */
 DIAGNOSTIC_PUSH
-MVSDIAGNOSTIC("warning(disable : 4100)")
+MVSDIAGNOSTIC(warning(disable : 4100))
 template<typename T>
 inline void destroy_at(T *ptr) { ptr->~T(); }
 DIAGNOSTIC_POP
@@ -258,7 +258,7 @@ struct FlexArray {
     const index_type mSize;
 DIAGNOSTIC_PUSH
 GNUDIAGNOSTIC("GCC diagnostic ignored \"-Wpedantic\"")
-MVSDIAGNOSTIC("warning(disable : 4200)")
+MVSDIAGNOSTIC(warning(disable : 4200))
     alignas(alignment) element_type mArray[0];
 DIAGNOSTIC_POP