proc create_build_dir {Makefile} {
    global build_dir
    global srcdir subdir

    # If build_dir hasn't been set, create it.
    if {[string length $build_dir] == 0} {
	if {[catch {exec mktemp -d staptestXXXXXX} build_dir]} {
	    verbose -log "Failed to create temporary directory: $build_dir"
	    return 0
	}
	foreach f [glob $srcdir/$subdir/*.c $srcdir/$subdir/*.d] {
	    exec cp $f $build_dir/
	}
	exec cp $srcdir/$subdir/$Makefile $build_dir/Makefile
    } else {
	# Otherwise, run "make clean"
	verbose -log "exec make -C $build_dir clean"
	set res [catch "exec make -C $build_dir clean" output]
	verbose -log "$output"
    }
    return 1
}

proc build_test_progs {Makefile test_progs {CFLAGS ""}} {
    global build_dir
    global env

    # Create the build directory and populate it
    create_build_dir $Makefile

    # Run make.
    set includes "-isystem$env(SYSTEMTAP_INCLUDES)"
    if {$CFLAGS != ""} {
	set CFLAGS "$includes $CFLAGS"
    } else {
	set CFLAGS "$includes"
    }
    verbose -log "exec make -C $build_dir CFLAGS=\"$CFLAGS\""
    set res [catch {eval { exec make -C $build_dir CFLAGS=$CFLAGS} } output]
    verbose -log "$output"

    # Check that the test progs were created
    foreach f $test_progs {
	if {![file exists $build_dir/$f]} {
	    verbose -log "Test program $f doesn't exist!"
	    return 0
	}
    }
    return 1
}

proc cleanup_test_progs {} {
    global build_dir
    if {$build_dir != ""} {
	catch { exec rm -rf $build_dir }
    }
}
