all: bare metal support (fix -freestanding) (#9624)

vlib/builtin/linux_bare/old/.checks/string/string.v

@@ -0,0 +1,63 @@
+module main
+import forkedtest
+
+fn check_string_eq () {
+	assert "monkey" != "rat"
+	some_animal := "a bird"
+	assert some_animal == "a bird"
+}
+
+fn check_i64_tos() {
+	buffer0 := []byte{len:(128)}
+	buffer := byteptr(buffer0.data)
+
+	s0 := i64_tos(buffer, 70, 140, 10)
+	assert s0 == "140"
+
+	s1 := i64_tos(buffer, 70, -160, 10)
+	assert s1 == "-160"
+
+	s2 := i64_tos(buffer, 70, 65537, 16)
+	assert s2 == "10001"
+
+	s3 := i64_tos(buffer, 70, -160000, 10)
+	assert s3 == "-160000"
+}
+
+fn check_i64_str() {
+	assert "141" == i64_str(141, 10)
+	assert "-161" == i64_str(-161, 10)
+	assert "10002" == i64_str(65538, 16)
+	assert "-160001" == i64_str(-160001, 10)
+}
+
+fn check_str_clone() {
+	a := i64_str(1234,10)
+	b := a.clone()
+	assert a == b
+	c := i64_str(-6789,10).clone()
+	assert c == "-6789"
+}
+
+fn check_string_add_works(){
+  abc := 'abc'
+  combined := 'a' + 'b' + 'c'
+  assert abc.len == combined.len
+  assert abc[0] == combined[0]
+  assert abc[1] == combined[1]
+  assert abc[2] == combined[2]
+  assert abc[0] == `a`
+  assert abc == combined
+}  
+
+fn main () {
+	mut fails := 0
+	fails += forkedtest.normal_run(check_string_eq, "check_string_eq")
+	fails += forkedtest.normal_run(check_i64_tos, "check_i64_tos")
+	fails += forkedtest.normal_run(check_i64_str, "check_i64_str")
+	fails += forkedtest.normal_run(check_str_clone, "check_str_clone")
+	fails += forkedtest.normal_run(check_string_add_works,    "check_string_add_works")
+	assert fails == 0
+	sys_exit(0)
+}
+