diff --git a/cmd/tools/vtest-fixed.v b/cmd/tools/vtest-fixed.v
index 5c8cba7ca6..b807a28686 100644
--- a/cmd/tools/vtest-fixed.v
+++ b/cmd/tools/vtest-fixed.v
@@ -9,7 +9,6 @@ const (
 		'vlib/arrays/arrays_test.v',
 		'vlib/cli/command_test.v',
 		'vlib/cli/flag_test.v',
-		'vlib/clipboard/clipboard_test.v', // Linux only
 		'vlib/crypto/aes/aes_test.v',
 		'vlib/crypto/rand/rand_test.v',
 		'vlib/crypto/rc4/rc4_test.v',
@@ -22,16 +21,12 @@ const (
 		'vlib/net/http/http_httpbin_test.v',
 		'vlib/net/http/http_test.v',
 		'vlib/regex/regex_test.v',
-		'vlib/sqlite/sqlite_test.v', // Linux only
 		'vlib/strconv/ftoa/f32_f64_to_string_test.v',
 		'vlib/v/tests/array_to_string_test.v',
-		'vlib/v/tests/asm_test.v', // Linux only
-		'vlib/v/tests/backtrace_test.v', // TCC only
 		'vlib/v/tests/enum_bitfield_test.v',
 		'vlib/v/tests/fixed_array_test.v',
 		'vlib/v/tests/fn_test.v',
 		'vlib/v/tests/fn_variadic_test.v',
-		'vlib/v/tests/live_test.v', // Linux only
 		'vlib/v/tests/match_test.v',
 		'vlib/v/tests/msvc_test.v',
 		'vlib/v/tests/mut_test.v',
@@ -47,6 +42,12 @@ const (
 		'vlib/v/tests/valgrind/valgrind_test.v', // ubuntu-musl only
 		'vlib/v/tests/pointers_str_test.v',
 	]
+	skip_on_non_linux = [
+		'vlib/clipboard/clipboard_test.v', // Linux only
+		'vlib/sqlite/sqlite_test.v', // Linux only
+		'vlib/v/tests/asm_test.v', // Linux only
+		'vlib/v/tests/live_test.v', // Linux only
+	]							  
 )
 
 fn main() {
@@ -57,12 +58,14 @@ fn main() {
 	args_string := args[1..].join(' ')
 	cmd_prefix := args_string.all_before('test-fixed')
 	title := 'testing all fixed tests'
-
 	all_test_files := os.walk_ext( os.join_path(vroot,'vlib'), '_test.v')
 	testing.eheader(title)
 	mut tsession := testing.new_test_session(cmd_prefix)
 	tsession.files << all_test_files
 	tsession.skip_files << skip_test_files
+	$if !linux {
+	   tsession.skip_files << skip_on_non_linux
+	}
 	tsession.test()
 	eprintln(tsession.benchmark.total_message(title))
 	if tsession.benchmark.nfail > 0 {
diff --git a/vlib/v/gen/cgen.v b/vlib/v/gen/cgen.v
index 83d87bef97..e01e6fe854 100644
--- a/vlib/v/gen/cgen.v
+++ b/vlib/v/gen/cgen.v
@@ -508,6 +508,7 @@ fn (g mut Gen) write_defer_stmts() {
 		if defer_stmt.ifdef.len > 0 {
 			g.writeln(defer_stmt.ifdef)
 			g.stmts(defer_stmt.stmts)
+			g.writeln('')
 			g.writeln('#endif')
 		} else {
 			g.stmts(defer_stmt.stmts)
@@ -2755,6 +2756,7 @@ fn op_to_fn_name(name string) string {
 
 fn comp_if_to_ifdef(name string) string {
 	match name {
+		// platforms/os-es:
 		'windows' {
 			return '_WIN32'
 		}
@@ -2785,27 +2787,36 @@ fn comp_if_to_ifdef(name string) string {
 		'android' {
 			return '__ANDROID__'
 		}
-		'js' {
-			return '_VJS'
-		}
 		'solaris' {
 			return '__sun'
 		}
 		'haiku' {
 			return '__haiku__'
 		}
-		'tinyc' {
-			return 'tinyc'
-		}
-		'debug' {
-			return '_VDEBUG'
-		}
 		'linux_or_macos' {
 			return ''
 		}
+		//
+		'js' {
+			return '_VJS'
+		}
+		// compilers:
+		'tinyc' {
+			return '__TINYC__'
+		}
+		'clang' {
+			return '__clang__'
+		}
 		'mingw' {
 			return '__MINGW32__'
 		}
+		'msvc' {
+			return '_MSC_VER'
+		}
+		// other:
+		'debug' {
+			return '_VDEBUG'
+		}
 		'glibc' {
 			return '__GLIBC__'
 		}
@@ -3015,24 +3026,24 @@ fn (g mut Gen) comp_if(it ast.CompIf) {
 	// NOTE: g.defer_ifdef is needed for defers called witin an ifdef
 	// in v1 this code would be completely excluded
 	g.defer_ifdef = if it.is_not {
-		'#ifndef ' + ifdef
+		'\n#ifndef ' + ifdef
 	} else {
-		'#ifdef ' + ifdef
+		'\n#ifdef ' + ifdef
 	}
 	// println('comp if stmts $g.file.path:$it.pos.line_nr')
 	g.stmts(it.stmts)
 	g.defer_ifdef = ''
 	if it.has_else {
-		g.writeln('#else')
+		g.writeln('\n#else')
 		g.defer_ifdef = if it.is_not {
-			'#ifdef ' + ifdef
+			'\n#ifdef ' + ifdef
 		} else {
-			'#ifndef ' + ifdef
+			'\n#ifndef ' + ifdef
 		}
 		g.stmts(it.else_stmts)
 		g.defer_ifdef = ''
 	}
-	g.writeln('#endif')
+	g.writeln('\n#endif')
 }
 
 fn (g mut Gen) go_stmt(node ast.GoStmt) {
diff --git a/vlib/v/gen/cheaders.v b/vlib/v/gen/cheaders.v
index 8a565dcdb1..0f01601352 100644
--- a/vlib/v/gen/cheaders.v
+++ b/vlib/v/gen/cheaders.v
@@ -54,7 +54,7 @@ const (
 #define V64_PRINTFORMAT "0x%"PRIx64
 #elif defined(__WIN32__)
 #define V64_PRINTFORMAT "0x%I64x"
-#elif defined(__LINUX__) && defined(__LP64__)
+#elif defined(__linux__) && defined(__LP64__)
 #define V64_PRINTFORMAT "0x%lx"
 #else
 #define V64_PRINTFORMAT "0x%llx"