fix v -o foo.c build module foo

vlib/builtin/bare/string_bare.v

@@ -8,9 +8,7 @@ pub:
 
 pub fn strlen(s byteptr) int {
 	mut i := 0
-	for i = 0; s[i] != 0; i++ {
-		
-	}	
+	for ; s[i] != 0; i++ {}	
 	return i
 }	
 

vlib/compiler/cc.v

@@ -31,6 +31,7 @@ fn (v mut V) cc() {
 	vdir := os.dir(vexe)
 	// Just create a C/JavaScript file and exit
 	// for example: `v -o v.c compiler`
+	println('CC() $v.out_name')
 	if v.out_name.ends_with('.c') || v.out_name.ends_with('.js') {
 		// Translating V code to JS by launching vjs.
 		// Using a separate process for V.js is for performance mostly,

vlib/compiler/main.v

@@ -838,7 +838,9 @@ pub fn new_v(args[]string) &V {
 		mod = mod_path.replace(os.path_separator, '.')
 		println('Building module "${mod}" (dir="$dir")...')
 		//out_name = '$TmpPath/vlib/${base}.o'
-		out_name = mod
+		if !out_name.ends_with('.c') {
+			out_name = mod
+		}
 		// Cross compiling? Use separate dirs for each os
 		/*
 		if target_os != os.user_os() {

vlib/compiler/parser.v

@@ -1501,7 +1501,7 @@ fn (p mut Parser) get_var_type(name string, is_ptr bool, deref_nr int) string {
 	// *var
 	if deref_nr > 0 {
 		/*
-		if !p.inside_unsafe {
+		if !p.inside_unsafe  && !p.pref.building_v && p.mod != 'os' {
 			p.error('dereferencing can only be done inside an `unsafe` block')
 		}	
 		*/