build: Add support for Windows

indexer/os/BUILD

@@ -1,13 +1,13 @@
 # NOTE(ref: based-on-sorbet): Based on Sorbet's common/os package.
 cc_library(
     name = "os",
-    srcs = [
-        "Os.h",
-        "Os.cc",
-    ] + select({
-        "@platforms//os:linux": ["Linux.cc"],
-        "@platforms//os:macos": ["macOS.cc"],
-    }),
+    srcs = glob(
+        [
+            "*.cc",
+            "*.h",
+        ],
+        allow_empty = False,
+    ),
     hdrs = [
         "Os.h",
     ],

indexer/os/Windows.cc

@@ -0,0 +1,49 @@
+#ifdef _WIN32
+
+#include <string>
+
+#include <libloaderapi.h>
+#include <processthreadsapi.h>
+#include <windef.h>
+#include <windows.h>
+
+#include "indexer/os/Os.h"
+
+namespace scip_clang {
+
+std::string exec(std::string cmd) {
+  // FIXME(def: windows-support) Implement this if needed for addr2line
+  return "";
+}
+
+std::string addr2line(std::string_view programName, void const *const *addr,
+                      int count) {
+  // FIXME(def: windows-support)
+  return "";
+}
+
+std::string getProgramName() {
+  char buf[MAX_PATH];
+  GetModuleFileNameA(nullptr, buf, MAX_PATH);
+  return buf;
+}
+
+bool setCurrentThreadName(std::string_view name) {
+  std::wstring wstr = std::wstring(name.begin(), name.end());
+  SetThreadDescription(GetCurrentThread(), wstr.c_str());
+  return true;
+}
+
+bool amIBeingDebugged() {
+  // FIXME(def: windows-support)
+  return false;
+}
+
+bool stopInDebugger() {
+  // FIXME(def: windows-support)
+  return false;
+}
+
+} // namespace scip_clang
+
+#endif