config.h: disable DEAL_II_CXX23_ASSUME for now

diff --git a/include/deal.II/base/config.h.in b/include/deal.II/base/config.h.in
index c9943b3efea1954c76f824d6e5d509d244ec3fa5..29be3d6fa917e4d9a9c0f56ceffb3abe25e5bb23 100644 (file)
--- a/include/deal.II/base/config.h.in
+++ b/include/deal.II/base/config.h.in
@@ -183,22 +183,31 @@
  * attribute for older standards we rely on compiler intrinsics when
  * available.
  */
-#if defined(__clang__)
-#  define DEAL_II_CXX23_ASSUME(expr) __builtin_assume(static_cast<bool>(expr))
-#elif defined(__GNUC__) && !defined(__ICC) && __GNUC__ >= 13
-#  define DEAL_II_CXX23_ASSUME(expr)                                   \
-    do                                                                 \
-      {                                                                \
-        _Pragma("GCC diagnostic push")                                 \
-          _Pragma("GCC diagnostic ignored \"-Wimplicit-fallthrough\"") \
-            [[assume(expr)]];                                          \
-        _Pragma("GCC diagnostic pop")                                  \
-      }                                                                \
-    while (false)
-#elif defined(_MSC_VER) || defined(__ICC)
-#  define DEAL_II_CXX23_ASSUME(expr) __assume(expr);
-#else
+#ifdef DEAL_II_EXPERIMENTAL_ASSUME
+#  error "Test"
+#  if defined(__clang__)
+#    define DEAL_II_CXX23_ASSUME(expr) __builtin_assume(static_cast<bool>(expr))
+#  elif defined(__GNUC__) && !defined(__ICC) && __GNUC__ >= 13
+#    define DEAL_II_CXX23_ASSUME(expr)                                   \
+      do                                                                 \
+        {                                                                \
+          _Pragma("GCC diagnostic push")                                 \
+            _Pragma("GCC diagnostic ignored \"-Wimplicit-fallthrough\"") \
+              [[assume(expr)]];                                          \
+          _Pragma("GCC diagnostic pop")                                  \
+        }                                                                \
+      while (false)
+#  elif defined(_MSC_VER) || defined(__ICC)
+#    define DEAL_II_CXX23_ASSUME(expr) __assume(expr);
+#  else
 /* no way with GCC to express this without evaluating 'expr' */
+#    define DEAL_II_CXX23_ASSUME(expr) \
+      do                               \
+        {                              \
+        }                              \
+      while (false)
+#  endif
+#else
 #  define DEAL_II_CXX23_ASSUME(expr) \
     do                               \
       {                              \