Accroding to 'The JDK Test Framework: Tag Language Specification' build action should accept class-name wildcard as argument and process it as all classes in the named package.
But jtreg fails:
----------messages:(2/61)----------
command: build *
reason: User specified action: run build *
result: Not run. Test running...

test result: Error. Can't find source file: *.java in directory-list: /home/iignatye/test/jtreg

$ cat /home/iignatye/test/jtreg/Test.java
/*
 * @test Test
 * @build *
 * @run main Test
 */
public class Test {
  public static void main(String[] args) { }
}