Provide core install suggestions only when compiling without profiles

Author: cmaglie

arduino/cores/packagemanager/profiles.go

@@ -86,7 +86,7 @@ func (pm *PackageManager) installMissingProfilePlatform(platformRef *sketch.Prof
 	// TODO: TaskProgressCB
 
 	// Instantiate a temporary package manager only for platform installation
-	tmp, err := paths.MkTempDir("", "")
+	tmp, err := paths.MkTempDir(pm.TempDir.String(), "")
 	if err != nil {
 		return fmt.Errorf("installing missing platform: could not create temp dir %s", err)
 	}

cli/compile/compile.go

@@ -292,10 +292,12 @@ func runCompileCommand(cmd *cobra.Command, args []string) {
 				PlatformArchitecture: split[1],
 			})
 
-			if platform != nil {
-				feedback.Errorf(tr("Try running %s", fmt.Sprintf("`%s core install %s`", globals.VersionInfo.Application, platformErr.Platform)))
-			} else {
-				feedback.Errorf(tr("Platform %s is not found in any known index\nMaybe you need to add a 3rd party URL?", platformErr.Platform))
+			if profileArg.String() == "" {
+				if platform != nil {
+					feedback.Errorf(tr("Try running %s", fmt.Sprintf("`%s core install %s`", globals.VersionInfo.Application, platformErr.Platform)))
+				} else {
+					feedback.Errorf(tr("Platform %s is not found in any known index\nMaybe you need to add a 3rd party URL?", platformErr.Platform))
+				}
 			}
 		}
 		os.Exit(errorcodes.ErrGeneric)