[gcc r12-2240] offloading: fix -foffload hinting

[Martin Liska <marxin@gcc.gnu.org>]

https://gcc.gnu.org/g:9b8b37d1b6301855213b8d4860feaeb74d464c6b

commit r12-2240-g9b8b37d1b6301855213b8d4860feaeb74d464c6b
Author: Martin Liska <mliska@suse.cz>
Date:   Mon Jul 12 10:59:06 2021 +0200

    offloading: fix -foffload hinting
    
            PR sanitizer/101425
    
    gcc/ChangeLog:
    
            * gcc.c (check_offload_target_name): Call
              candidates_list_and_hint only if we have a candidate.

Diff:
---
 gcc/gcc.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/gcc/gcc.c b/gcc/gcc.c
index f086dd47b91..12b3440c342 100644
--- a/gcc/gcc.c
+++ b/gcc/gcc.c
@@ -4001,7 +4001,6 @@ check_offload_target_name (const char *target, ptrdiff_t len)
     }
   if (!c)
     {
-      char *s;
       auto_vec<const char*> candidates;
       size_t olen = strlen (OFFLOAD_TARGETS) + 1;
       char *cand = XALLOCAVEC (char, olen);
@@ -4015,15 +4014,19 @@ check_offload_target_name (const char *target, ptrdiff_t len)
 
       error ("GCC is not configured to support %qs as offload target", target2);
 
-      const char *hint = candidates_list_and_hint (target2, s, candidates);
       if (candidates.is_empty ())
 	inform (UNKNOWN_LOCATION, "no offloading targets configured");
-      else if (hint)
-	inform (UNKNOWN_LOCATION,
-		"valid offload targets are: %s; did you mean %qs?", s, hint);
       else
-	inform (UNKNOWN_LOCATION, "valid offload targets are: %s", s);
-      XDELETEVEC (s);
+	{
+	  char *s;
+	  const char *hint = candidates_list_and_hint (target2, s, candidates);
+	  if (hint)
+	    inform (UNKNOWN_LOCATION,
+		    "valid offload targets are: %s; did you mean %qs?", s, hint);
+	  else
+	    inform (UNKNOWN_LOCATION, "valid offload targets are: %s", s);
+	  XDELETEVEC (s);
+	}
       return false;
     }
   return true;