native: fix again v -os macos -experimental -b native -o hw.macos examples/hello_world.v, after the latest changes to the backend

.github/workflows/linux_ci.yml

@@ -75,6 +75,8 @@ jobs:
         run: v run ci/linux_ci.vsh test_leak_detector_tcc
       - name: Test leak detector not being active for normal compile
         run: v run ci/linux_ci.vsh test_leak_detector_not_active_tcc
+      - name: native cross compilation to macos
+        run: v run ci/linux_ci.vsh native_cross_compilation_to_macos
 
   gcc-linux:
     runs-on: ubuntu-24.04
@@ -121,6 +123,8 @@ jobs:
         run: v run ci/linux_ci.vsh build_modules_gcc
       - name: native machine code generation
         run: v run ci/linux_ci.vsh native_machine_code_generation_gcc
+      - name: native cross compilation to macos
+        run: v run ci/linux_ci.vsh native_cross_compilation_to_macos
       - name: compile vdoctor.v with -prod
         run: v run ci/linux_ci.vsh compile_vdoctor_prod_gcc
       - name: compile vup.v with -prod
@@ -167,3 +171,5 @@ jobs:
         run: v run ci/linux_ci.vsh build_modules_clang
       - name: native machine code generation
         run: v run ci/linux_ci.vsh native_machine_code_generation_clang
+      - name: native cross compilation to macos
+        run: v run ci/linux_ci.vsh native_cross_compilation_to_macos

ci/common/runner.v

@@ -14,6 +14,22 @@ pub fn exec(command string) {
 	}
 }
 
+pub fn file_size_greater_than(fpath string, min_fsize u64) {
+	log.info('path should exist `${fpath}` ...')
+	if !os.exists(fpath) {
+		exit(1)
+	}
+	log.info('path exists, and should be a file: `${fpath}` ...')
+	if !os.is_file(fpath) {
+		exit(2)
+	}
+	real_size := os.file_size(fpath)
+	log.info('actual file size of `${fpath}` is ${real_size}, wanted: ${min_fsize}, diff: ${real_size - min_fsize}.')
+	if real_size < min_fsize {
+		exit(3)
+	}
+}
+
 const self_command = 'v ' +
 	os.real_path(os.executable()).replace_once(os.real_path(@VROOT), '').trim_left('/\\') + '.vsh'
 

ci/linux_ci.vsh

@@ -363,6 +363,12 @@ fn native_machine_code_generation_clang() {
 	native_machine_code_generation_common()
 }
 
+fn native_cross_compilation_to_macos() {
+	exec('v -os macos -experimental -b native -o hw.macos examples/hello_world.v')
+	common.file_size_greater_than('hw.macos', 8000)
+	exec('rm -f hw.macos')
+}
+
 //
 // Collect all tasks
 //
@@ -409,7 +415,6 @@ const all_tasks = {
 	'build_option_test_autofree_gcc':                    Task{build_option_test_autofree_gcc, 'Build option_test.c.v with -autofree (gcc)'}
 	'v_self_compilation_parallel_cc_gcc':                Task{v_self_compilation_parallel_cc_gcc, 'V self compilation with -parallel-cc (gcc)'}
 	'build_modules_gcc':                                 Task{build_modules_gcc, 'Build modules (gcc)'}
-	'native_machine_code_generation_gcc':                Task{native_machine_code_generation_gcc, 'native machine code generation (gcc)'}
 	'compile_vdoctor_prod_gcc':                          Task{compile_vdoctor_prod_gcc, 'compile vdoctor with -prod (gcc)'}
 	'compile_vup_prod_gcc':                              Task{compile_vup_prod_gcc, 'compile vup with -prod (gcc)'}
 	// clang tasks
@@ -429,6 +434,8 @@ const all_tasks = {
 	'build_examples_autofree_clang':                     Task{build_examples_autofree_clang, 'Build examples with -autofree (clang)'}
 	'build_modules_clang':                               Task{build_modules_clang, 'Build modules (clang)'}
 	'native_machine_code_generation_clang':              Task{native_machine_code_generation_clang, 'native machine code generation (clang)'}
+	'native_machine_code_generation_gcc':                Task{native_machine_code_generation_gcc, 'native machine code generation (gcc)'}
+	'native_cross_compilation_to_macos':                 Task{native_cross_compilation_to_macos, 'native cross compilation to macos'}
 }
 
 common.run(all_tasks)

vlib/v/gen/native/expr.v

@@ -196,6 +196,8 @@ fn (mut g Gen) extern_var_ident(var ExternVar) {
 		g.extern_vars[g.pos()] = var.name
 		g.code_gen.mov64(main_reg, Number(i64(0)))
 		g.code_gen.mov_deref(main_reg, main_reg, ast.u64_type_idx)
+	} else if g.pref.os == .macos {
+		eprintln('## TODO, macos, extern_var_ident, var: ${var}')
 	} else {
 		g.n_error('${@LOCATION} unsupported os for ${var}')
 	}