v.builder: fix v -os wasm32_emscripten examples/2048 on windows

vlib/v/builder/cc.v

@@ -185,7 +185,7 @@ fn (mut v Builder) setup_ccompiler_options(ccompiler string) {
 	ccoptions.guessed_compiler = v.pref.ccompiler
 	if ccoptions.guessed_compiler == 'cc' && v.pref.is_prod {
 		// deliberately guessing only for -prod builds for performance reasons
-		ccversion := os.execute('${os.quoted_path('cc')} --version')
+		ccversion := os.execute('cc --version')
 		if ccversion.exit_code == 0 {
 			if ccversion.output.contains('This is free software;')
 				&& ccversion.output.contains('Free Software Foundation, Inc.') {
@@ -412,7 +412,9 @@ fn (v &Builder) all_args(ccoptions CcompilerOptions) []string {
 		// normally msvc should use /volatile:iso
 		// but it could have an impact on vinix if it is created with msvc.
 		if !ccoptions.is_cc_msvc {
+			if v.pref.os != .wasm32_emscripten {
 				all << '-Wl,-stack=16777216'
+			}
 			if !v.pref.is_cstrict {
 				all << '-Werror=implicit-function-declaration'
 			}
@@ -569,14 +571,14 @@ pub fn (mut v Builder) cc() {
 		all_args := v.all_args(v.ccoptions)
 		v.dump_c_options(all_args)
 		str_args := all_args.join(' ')
-		mut cmd := '${os.quoted_path(ccompiler)} ${str_args}'
+		mut cmd := '${v.quote_compiler_name(ccompiler)} ${str_args}'
 		mut response_file := ''
 		mut response_file_content := str_args
 		if !v.pref.no_rsp {
 			response_file = '${v.out_name_c}.rsp'
 			response_file_content = str_args.replace('\\', '\\\\')
 			rspexpr := '@${response_file}'
-			cmd = '${os.quoted_path(ccompiler)} ${os.quoted_path(rspexpr)}'
+			cmd = '${v.quote_compiler_name(ccompiler)} ${os.quoted_path(rspexpr)}'
 			os.write_file(response_file, response_file_content) or {
 				verror('Unable to write to C response file "${response_file}"')
 			}
@@ -735,7 +737,7 @@ fn (mut b Builder) cc_linux_cross() {
 		cc_name = 'clang.exe'
 		out_name = out_name.trim_string_right('.exe')
 	}
-	cc_cmd := '${os.quoted_path(cc_name)} ' + cc_args.join(' ')
+	cc_cmd := '${b.quote_compiler_name(cc_name)} ' + cc_args.join(' ')
 	if b.pref.show_cc {
 		println(cc_cmd)
 	}
@@ -757,7 +759,7 @@ fn (mut b Builder) cc_linux_cross() {
 	$if windows {
 		ldlld = 'ld.lld.exe'
 	}
-	linker_cmd := '${os.quoted_path(ldlld)} ' + linker_args.join(' ')
+	linker_cmd := '${b.quote_compiler_name(ldlld)} ' + linker_args.join(' ')
 	// s = s.replace('SYSROOT', sysroot) // TODO $ inter bug
 	// s = s.replace('-o hi', '-o ' + c.pref.out_name)
 	if b.pref.show_cc {
@@ -931,7 +933,7 @@ fn (mut v Builder) build_thirdparty_obj_file(mod string, path string, moduleflag
 	all_options << '-c ${os.quoted_path(cfile)}'
 	cc_options := v.thirdparty_object_args(v.ccoptions, all_options).join(' ')
 
-	cmd := '${os.quoted_path(v.pref.ccompiler)} ${cc_options}'
+	cmd := '${v.quote_compiler_name(v.pref.ccompiler)} ${cc_options}'
 	$if trace_thirdparty_obj_files ? {
 		println('>>> build_thirdparty_obj_files cmd: ${cmd}')
 	}

vlib/v/builder/cc_windows.v

@@ -6,13 +6,26 @@ module builder
 import os
 import v.pref
 
+pub fn (mut v Builder) quote_compiler_name(name string) string {
+	// some compiler frontends on windows, like emcc, are a .bat file on windows.
+	// Quoting the .bat file name here leads to problems with them, when they internally call python scripts for some reason.
+	// Just emcc without quotes here does work, but:
+	// |"emcc" -v| produces: python.exe: can't open file 'D:\programs\v\emcc.py': [Errno 2] No such file or directory
+	if name.contains('/') || name.contains('\\') {
+		return os.quoted_path(name)
+	}
+	return name
+}
+
 pub fn (mut v Builder) find_win_cc() ! {
 	$if !windows {
 		return
 	}
-	ccompiler_version_res := os.execute('${os.quoted_path(v.pref.ccompiler)} -v')
+	cmd_version := '${v.quote_compiler_name(v.pref.ccompiler)} -v'
+	ccompiler_version_res := os.execute(cmd_version)
 	if ccompiler_version_res.exit_code != 0 {
 		if v.pref.is_verbose {
+			println('failed command: `${cmd_version}`')
 			println('${v.pref.ccompiler} not found, looking for msvc...')
 		}
 		find_msvc(v.pref.m64) or {

vlib/v/pref/default.v

@@ -285,6 +285,9 @@ pub fn (p &Preferences) vcross_compiler_name() string {
 		return 'clang'
 	}
 	if p.os == .wasm32_emscripten {
+		if os.user_os() == 'windows' {
+			return 'emcc.bat'
+		}
 		return 'emcc'
 	}
 	if p.backend == .c && !p.out_name.ends_with('.c') {