Add an option to set all klee CLI flags/options

cargo-klee/src/main.rs

@@ -97,6 +97,13 @@ fn run() -> Result<i32, failure::Error> {
                 .short("g")
                 .help("Run the generated replay binary in `gdb`. The environment variable `GDB_CWD` determines the `gdb` working directory, if unset `gdb` will execute in the current working directory"),
         )
+        // This needs to be the last argument!
+        .arg(
+            Arg::with_name("options")
+                .takes_value(true)
+                .raw(true)
+                .help("Add native `klee` CLI options after the sequence `--`. See `klee --help` for all available options.")
+        )
         .get_matches();
 
     let is_example = matches.is_present("example");
@@ -278,6 +285,12 @@ fn run() -> Result<i32, failure::Error> {
     // klee analysis
     if is_ktest || !is_replay {
         let mut klee = Command::new("klee");
+        // Check for additional KLEE options which will be sent to `klee`
+        if let Some(klee_options) = matches.values_of("options") {
+            for option in klee_options {
+                klee.arg(option);
+            }
+        }
         klee
             // ll file to analyse
             .arg(ll.unwrap());