builder: cross compiling for linux, part 1

vlib/v/builder/cc.v

@@ -248,18 +248,7 @@ fn (mut v Builder) cc() {
 			}
 			else {
 				println('$path not found... building module $imp')
-				if path.ends_with('vlib/ui.o') {
-					println('copying ui...')
-					os.cp('$vdir/thirdparty/ui/ui.o', path)or{
-						panic('error copying ui files')
-					}
-					os.cp('$vdir/thirdparty/ui/ui.vh', pref.default_module_path + '/vlib/ui.vh')or{
-						panic('error copying ui files')
-					}
-				}
-				else {
-					os.system('$vexe build module vlib${os.path_separator}$imp_path')
-				}
+				os.system('$vexe build module vlib${os.path_separator}$imp_path')
 			}
 			if path.ends_with('vlib/ui.o') {
 				a << '-framework Cocoa -framework Carbon'
@@ -270,18 +259,12 @@ fn (mut v Builder) cc() {
 	if v.pref.sanitize {
 		a << '-fsanitize=leak'
 	}
-	// Cross compiling linux TODO
-	/*
-	sysroot := '/tmp/lld/linuxroot/'
-	if v.os == .linux && !linux_host {
-		// Build file.o
-		a << '-c --sysroot=$sysroot -target x86_64-linux-gnu'
-		// Right now `out_name` can be `file`, not `file.o`
-		if !v.out_name.ends_with('.o') {
-			v.out_name = v.out_name + '.o'
+	// Cross compiling linux
+	if v.pref.os == .linux {
+		$if !linux {
+			v.cc_linux_cross()
 		}
 	}
-	*/
 	// Cross compiling windows
 	//
 	// Output executable name
@@ -489,6 +472,18 @@ If you're confident that all of the above is true, please try running V with the
 	}
 }
 
+fn (mut c Builder) cc_linux_cross() {
+	/*
+	sysroot := '/tmp/lld/linuxroot/'
+		// Build file.o
+		a << '-c --sysroot=$sysroot -target x86_64-linux-gnu'
+		// Right now `out_name` can be `file`, not `file.o`
+		if !v.out_name.ends_with('.o') {
+			v.out_name = v.out_name + '.o'
+		}
+		*/
+}
+
 fn (mut c Builder) cc_windows_cross() {
 	println('Cross compiling for Windows...')
 	if !c.pref.out_name.ends_with('.exe') {