support windows and macos

.bazelrc

@@ -1 +0,0 @@
-build --cxxopt="-std=c++20"

BUILD

@@ -1,10 +1,13 @@
 package(default_visibility = ["//visibility:public"])
 
+load("//bazel/config:copt.bzl", "WAMON_COPTS")
+
 cc_library(
   name = "wamon",
   hdrs = glob(["include/**/*.h"]),
   srcs = glob(["src/*.cc"]),
   includes = ["include"],
+  copts = WAMON_COPTS,
   deps = [
     "@fmt//:fmt",
   ]
@@ -13,6 +16,7 @@ cc_library(
 cc_test(
   name = "wamon_test",
   srcs = glob(["test/*.cc"]),
+  copts = WAMON_COPTS,
   deps = [
     ":wamon",
     "@googletest//:gtest",
@@ -23,6 +27,7 @@ cc_test(
 cc_binary(
   name = "hello_world",
   srcs = ["example/hello_world.cc"],
+  copts = WAMON_COPTS,
   deps = [
     ":wamon"
   ],
@@ -31,6 +36,7 @@ cc_binary(
 cc_binary(
   name = "register_cpp_func",
   srcs = ["example/register_cpp_function.cc"],
+  copts = WAMON_COPTS,
   deps = [
     ":wamon"
   ],
@@ -39,6 +45,7 @@ cc_binary(
 cc_binary(
   name = "interpreter_api",
   srcs = ["example/interpreter_api.cc"],
+  copts = WAMON_COPTS,
   deps = [
     ":wamon"
   ],
@@ -47,6 +54,7 @@ cc_binary(
 cc_binary(
   name = "lambda",
   srcs = ["example/lambda.cc"],
+  copts = WAMON_COPTS,
   deps = [
     ":wamon"
   ],
@@ -55,6 +63,7 @@ cc_binary(
 cc_binary(
   name = "struct_trait",
   srcs = ["example/struct_trait.cc"],
+  copts = WAMON_COPTS,
   deps = [
     ":wamon"
   ],
@@ -63,6 +72,7 @@ cc_binary(
 cc_binary(
   name = "merge_sort",
   srcs = ["example/merge_sort.cc"],
+  copts = WAMON_COPTS,
   deps = [
     ":wamon"
   ],

WORKSPACE

@@ -1,3 +1,5 @@
+workspace(name = "com_github_wamon")
+
 load('@bazel_tools//tools/build_defs/repo:git.bzl', 'git_repository')
 
 git_repository(

bazel/config/BUILD

@@ -0,0 +1,6 @@
+config_setting(
+    name = "msvc_compiler",
+    flag_values = {
+        "@bazel_tools//tools/cpp:compiler": "msvc-cl",
+    },
+)

bazel/config/copt.bzl

@@ -0,0 +1,15 @@
+WAMON_COPTS = select({
+  "@com_github_wamon//bazel/config:msvc_compiler": [
+    "/std:c++20",
+    "/EHa"
+  ],
+  "//conditions:default": [
+    "-std=c++20",
+    "-D_GLIBCXX_USE_CXX11_ABI=1",
+    "-Wall",
+    "-Werror",
+    "-g",
+  ],
+}
+
+)

include/wamon/ast.h

@@ -259,7 +259,7 @@ class LambdaExpr : public Expression {
   }
 
   static bool IsLambdaName(const std::string& name) {
-    constexpr int len = strlen("__lambda_");
+    const int len = strlen("__lambda_");
     return name.size() >= len && name.substr(0, len) == "__lambda_";
   }