CI: ubuntu-musl target

.github/workflows/ci.yml

@@ -59,6 +59,22 @@ jobs:
         ./v -o v2 v.v # Make sure vtcc can build itself
         ./v test v
 
+  build-ubuntu-musl:
+    runs-on: ubuntu-18.04
+    steps:
+    - uses: actions/checkout@v1
+    - uses: actions/setup-node@v1
+      with:
+        node-version: 12.x
+    - name: Install dependencies
+      run: sudo apt-get update; sudo apt-get install --quiet -y musl msul-tools
+    - name: Build v
+      run: make && ./v -cc musl-gcc -o v v.v
+#    - name: Test v->c
+#      run: ./v test v
+#    - name: Test v->js
+#      run: ./v -o hi.js examples/hello_v_js.v && node hi.js
+
   build-windows-gcc:
     runs-on: windows-2019
     steps:

vlib/builtin/builtin_nix.v

@@ -24,9 +24,11 @@ fn print_backtrace_skipping_top_frames_nix(xskipframes int) bool {
 // the functions below are not called outside this file,
 // so there is no need to have their twins in builtin_windows.v
 fn print_backtrace_skipping_top_frames_mac(skipframes int) bool {
+	$if mac {
 	buffer := [100]byteptr
 	nr_ptrs := C.backtrace(*voidptr(buffer), 100)
 	C.backtrace_symbols_fd(*voidptr(&buffer[skipframes]), nr_ptrs-skipframes, 1)
+	}
 	return true
 }
 

vlib/os/os_nix.v

@@ -47,6 +47,11 @@ pub fn ls(path string) ?[]string {
 }
 
 pub fn dir_exists(path string) bool {
+	/*
+	$if linux {
+		C.syscall(4, path.str) // sys_newstat
+	}	
+	*/
 	dir := C.opendir(path.str)
 	res := !isnil(dir)
 	if res {

vlib/os/os_test.v

@@ -76,6 +76,7 @@ fn test_write_and_read_bytes() {
 fn test_create_and_delete_folder() {
   folder := './test1'
   os.mkdir(folder)
+	assert os.dir_exists(folder)
 
   folder_contents := os.ls(folder) or { panic(err) }
   assert folder_contents.len == 0
@@ -120,7 +121,7 @@ fn test_walk() {
 fn test_cp() {
     old_file_name := 'cp_example.txt'
     new_file_name := 'cp_new_example.txt'
-    
+
     os.write_file(old_file_name, 'Test data 1 2 3, V is awesome #$%^[]!~⭐')
     os.cp(old_file_name, new_file_name) or { panic('$err: errcode: $errcode') }
 
@@ -191,7 +192,7 @@ fn cleanup_leftovers(){
 	os.rm('ex/ex2/ex2.txt')
 	os.rm('ex/ex2')
 	os.rm('ex/ex1.txt')
-	os.rm('ex')  
+	os.rm('ex')
 	os.rm('ex2/ex2.txt')
 	os.rm('ex2')
 	os.rm('ex1.txt')