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gnu-tm: Dont allow assigning transaction_unsafe functions to transaction_safe function pointers (issue6198054)

Without this patch it is perfectly fine to assign non-transaction_safe
functions to function pointers marked as transaction_safe.  Unpleasantness
happens at run time.


 __attribute__((transaction_safe)) long (*compare)(int, int); 

compare = my_funky_random_function;

 gcc/c-typeck.c |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/gcc/c-typeck.c b/gcc/c-typeck.c
index fc01a79..69687d6 100644
--- a/gcc/c-typeck.c
+++ b/gcc/c-typeck.c
@@ -5608,6 +5608,13 @@ convert_for_assignment (location_t location, tree type, tree rhs,
+      /* Check for assignment to transaction safe */
+      if (is_tm_safe(type) && !is_tm_safe_or_pure (rhs)) {
+	  warning_at (location, 0,
+		      "Assigning unsafe function to transaction_safe "
+		      "function pointer"); 
+      }
       /* Any non-function converts to a [const][volatile] void *
 	 and vice versa; otherwise, targets must be the same.
 	 Meanwhile, the lhs target must have all the qualifiers of the rhs.  */

This patch is available for review at

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