[gn build] Support compiler-rt/profile on Windows

Reviewed By: thakis

Differential Revision: https://reviews.llvm.org/D101961

llvm/utils/gn/build/toolchain/BUILD.gn

@@ -239,7 +239,14 @@ if (host_os == "mac") {
   }
 }
 
-toolchain("win") {
+template("win_toolchain") {
+  toolchain(target_name) {
+    # https://groups.google.com/a/chromium.org/d/msg/gn-dev/F_lv5T-tNDM
+    forward_variables_from(invoker.toolchain_args, "*")
+    not_needed("*")
+
+    forward_variables_from(invoker, "*")
+
     cl = "cl"
     link = "link"
 
@@ -343,9 +350,26 @@ toolchain("win") {
       command = "cmd /c type nul > {{output}}"
       description = "STAMP {{output}}"
     }
+  }
+}
 
+win_toolchain("win") {
   toolchain_args = {
     current_os = "win"
     current_cpu = host_cpu
   }
 }
+
+win_toolchain("stage2_win") {
+  toolchain_args = {
+    current_os = host_os
+    current_cpu = host_cpu
+
+    clang_base_path = root_build_dir
+    use_goma = false
+  }
+  deps = [
+    "//:clang($host_toolchain)",
+    "//:lld($host_toolchain)",
+  ]
+}

llvm/utils/gn/secondary/BUILD.gn

@@ -8,14 +8,12 @@ group("default") {
     "//clang-tools-extra/test",
     "//clang/test",
     "//clang/tools/scan-build",
+    "//compiler-rt",
     "//compiler-rt/include",
     "//compiler-rt/lib/scudo",
     "//lld/test",
     "//llvm/test",
   ]
-  if (current_os == "linux" || current_os == "mac") {
-    deps += [ "//compiler-rt" ]
-  }
   if (current_os == "linux") {
     deps += [
       "//libcxx",

llvm/utils/gn/secondary/compiler-rt/BUILD.gn

@@ -5,7 +5,11 @@ import("//llvm/utils/gn/build/toolchain/compiler.gni")
 # In the GN build, compiler-rt is always built by just-built clang and lld.
 # FIXME: For macOS and iOS builds, depend on lib in all needed target arch
 # toolchains and then lipo them together for the final output.
+if (current_os == "win") {
+  supported_toolchains = [ "//llvm/utils/gn/build/toolchain:stage2_win" ]
+} else {
   supported_toolchains = [ "//llvm/utils/gn/build/toolchain:stage2_unix" ]
+}
 if (android_ndk_path != "") {
   supported_toolchains += [
     "//llvm/utils/gn/build/toolchain:stage2_android_aarch64",

llvm/utils/gn/secondary/compiler-rt/lib/BUILD.gn

@@ -1,8 +1,10 @@
 group("lib") {
-  deps = [
+  deps = [ "//compiler-rt/lib/profile" ]
+  if (current_os != "win") {
+    deps += [
       "//compiler-rt/lib/asan",
       "//compiler-rt/lib/builtins",
-    "//compiler-rt/lib/profile",
       "//compiler-rt/lib/tsan",
     ]
   }
+}

llvm/utils/gn/secondary/compiler-rt/target.gni

@@ -28,6 +28,9 @@ if (clang_enable_per_target_runtime_dir) {
   }
 } else if (current_os == "ios" || current_os == "mac") {
   crt_current_out_dir = "$clang_resource_dir/lib/darwin"
+} else if (current_os == "win") {
+  crt_current_out_dir = "$clang_resource_dir/lib/windows"
+  crt_current_target_suffix = "-$crt_current_target_arch"
 } else {
   assert(false, "unimplemented current_os " + current_os)
 }