windows launcher: Make the launcer compile under mingw

TEST: bazel build --platforms=//:windows_x86_64  --extra_toolchains=@llvm_mingw_linux_x86_64//:cc-toolchain-linux_x86_64-windows_x86_64 //src/tools/launcher:launcher

BUILD

@@ -285,6 +285,14 @@ platform(
     ],
 )
 
+platform(
+    name = "windows_x86_64",
+    constraint_values = [
+        "@platforms//os:windows",
+        "@platforms//cpu:x86_64",
+    ],
+)
+
 REMOTE_PLATFORMS = ("rbe_ubuntu2004",)
 
 [

MODULE.bazel

@@ -409,3 +409,6 @@ register_toolchains("@local_config_winsdk//:all")
 register_toolchains("//src/main/res:empty_rc_toolchain")
 
 register_toolchains("@graalvm_toolchains//:gvm")
+
+llvm_mingw_extension = use_extension("//third_party/llvm_mingw:defs.bzl", "llvm_mingw_extension")
+use_repo(llvm_mingw_extension, "llvm_mingw_linux_x86_64")

src/main/native/windows/file.cc

@@ -18,11 +18,11 @@
 
 #include "src/main/native/windows/file.h"
 
-#include <WinIoCtl.h>
 #include <stdint.h>  // uint8_t
 #include <versionhelpers.h>
 #include <winbase.h>
 #include <windows.h>
+#include <winioctl.h>
 
 #include <memory>
 #include <sstream>

src/main/native/windows/process.cc

@@ -18,8 +18,8 @@
 
 #include "src/main/native/windows/process.h"
 
+#include <versionhelpers.h>
 #include <windows.h>
-#include <VersionHelpers.h>
 
 #include <memory>
 #include <sstream>

src/tools/launcher/java_launcher.cc

@@ -250,7 +250,7 @@ wstring JavaBinaryLauncher::CreateClasspathJar(const wstring& classpath) {
       binary_base_path + rand_id + L".jar_manifest";
   blaze_util::AddUncPrefixMaybe(&jar_manifest_file_path);
 #if (__cplusplus >= 201703L)
-  wofstream jar_manifest_file(std::filesystem::path(jar_manifest_file_path));
+  wofstream jar_manifest_file{std::filesystem::path(jar_manifest_file_path)};
 #else
   wofstream jar_manifest_file(jar_manifest_file_path);
 #endif

src/tools/launcher/launcher_main.cc

@@ -29,6 +29,8 @@
 #endif
 
 #include <windows.h>
+#include <processenv.h>
+#include <shellapi.h>
 
 #include <memory>
 #include <string>
@@ -64,7 +66,16 @@ static std::wstring GetExecutableFileName() {
   return buffer.substr(0, length);
 }
 
+#if defined(_MSC_VER)
 int wmain(int argc, wchar_t* argv[]) {
+#else
+int main() {
+  int argc = 0;
+  wchar_t** argv = CommandLineToArgvW(GetCommandLineW(), &argc);
+  if (argv == nullptr) {
+    die(L"CommandLineToArgvW failed.");
+  }
+#endif
   // In case the given binary path is a shortened Windows 8dot3 path, we convert
   // it back to its long path form so that path manipulations (e.g. appending
   // ".runfiles") work as expected. Note that GetExecutableFileName may return a