c: check if target_clone attrs are all string

	PR c/107993

gcc/c-family/ChangeLog:

	* c-attribs.cc (handle_target_clones_attribute): Check for
	string constant for all target_clone attribute values.

gcc/testsuite/ChangeLog:

	* gcc.target/i386/pr107993.c: New test.

2 files changed, 19 insertions, 4 deletions

diff --git a/gcc/c-family/c-attribs.cc b/gcc/c-family/c-attribs.cc
index b36dd97..33d84cb 100644
--- a/gcc/c-family/c-attribs.cc
+++ b/gcc/c-family/c-attribs.cc
@@ -5574,12 +5574,18 @@ handle_target_clones_attribute (tree *node, tree name, tree ARG_UNUSED (args),
   /* Ensure we have a function type.  */
   if (TREE_CODE (*node) == FUNCTION_DECL)
     {
-      if (TREE_CODE (TREE_VALUE (args)) != STRING_CST)
+      for (tree t = args; t != NULL_TREE; t = TREE_CHAIN (t))
 	{
-	  error ("%qE attribute argument not a string constant", name);
-	  *no_add_attrs = true;
+	  tree value = TREE_VALUE (t);
+	  if (TREE_CODE (value) != STRING_CST)
+	    {
+	      error ("%qE attribute argument not a string constant", name);
+	      *no_add_attrs = true;
+	      return NULL_TREE;
+	    }
 	}
-      else if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (*node)))
+
+      if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (*node)))
 	{
 	  warning (OPT_Wattributes, "%qE attribute ignored due to conflict "
 		   "with %qs attribute", name, "always_inline");
diff --git a/gcc/testsuite/gcc.target/i386/pr107993.c b/gcc/testsuite/gcc.target/i386/pr107993.c
new file mode 100644
index 0000000..b0b84a6
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr107993.c
@@ -0,0 +1,9 @@
+/* PR c/107993 */
+/* { dg-do compile } */
+
+typedef union { int x; } u;
+__attribute__((target_clones("arch=alderlake",!"default")))
+int f (u *x)
+{ /* { dg-error ".target_clones. attribute argument not a string constant" } */
+  return 0;
+}