Bazel can now be built on Windows with MSVC

bazel build //src:bazel --cpu=x64_windows_msvc
now succeeds, hooray!

This change adds empty implementations for
build-runfiles and process-wrapper to make that
possible.

This means we can now build a bazel binary that
doesn't depend on MSYS.

The resulting binary is not yet functional because
many methods are still to be implemented, and they
just write "TODO: implement" or something similar.
But still this is great news, because now we can
add compile tests to the CI for MSVC!

See https://github.com/bazelbuild/bazel/issues/2107

--
PiperOrigin-RevId: 146106178
MOS_MIGRATED_REVID=146106178

3 files changed, 69 insertions, 7 deletions

diff --git a/src/main/tools/BUILD b/src/main/tools/BUILD
index 2c52acf6db..d7bb93bdcf 100644
--- a/src/main/tools/BUILD
+++ b/src/main/tools/BUILD
@@ -2,18 +2,27 @@ package(default_visibility = ["//src:__subpackages__"])
 
 cc_binary(
     name = "process-wrapper",
-    srcs = [
-        "process-tools.c",
-        "process-tools.h",
-        "process-wrapper.c",
-    ],
-    copts = ["-std=c99"],
+    srcs = select({
+        "//src:windows_msvc": ["process-wrapper-windows.cc"],
+        "//conditions:default": [
+            "process-tools.c",
+            "process-tools.h",
+            "process-wrapper.c",
+        ],
+    }),
+    copts = select({
+        "//src:windows_msvc": [],
+        "//conditions:default": ["-std=c99"],
+    }),
     linkopts = ["-lm"],
 )
 
 cc_binary(
     name = "build-runfiles",
-    srcs = ["build-runfiles.cc"],
+    srcs = select({
+        "//src:windows_msvc": ["build-runfiles-windows.cc"],
+        "//conditions:default": ["build-runfiles.cc"],
+    }),
 )
 
 cc_binary(
diff --git a/src/main/tools/build-runfiles-windows.cc b/src/main/tools/build-runfiles-windows.cc
new file mode 100644
index 0000000000..ea4eed189a
--- /dev/null
+++ b/src/main/tools/build-runfiles-windows.cc
@@ -0,0 +1,27 @@
+// Copyright 2017 The Bazel Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <iostream>
+
+int main(int argc, char** argv) {
+  // TODO(bazel-team): decide whether we need build-runfiles at all on Windows.
+  // Implement this program if so; make sure we don't run it on Windows if not.
+  std::cout << "ERROR: build-runfiles is not (yet?) implemented on Windows."
+            << std::endl
+            << "Called with args:" << std::endl;
+  for (int i = 0; i < argc; ++i) {
+    std::cout << "argv[" << i << "]=(" << argv[i] << ")" << std::endl;
+  }
+  return 1;
+}
diff --git a/src/main/tools/process-wrapper-windows.cc b/src/main/tools/process-wrapper-windows.cc
new file mode 100644
index 0000000000..e113968b72
--- /dev/null
+++ b/src/main/tools/process-wrapper-windows.cc
@@ -0,0 +1,26 @@
+// Copyright 2017 The Bazel Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <iostream>
+
+int main(int argc, char** argv) {
+  // TODO(bazel-team): implement this program.
+  std::cout << "ERROR: process-wrapper is not yet implemented on Windows."
+            << std::endl
+            << "Called with args:" << std::endl;
+  for (int i = 0; i < argc; ++i) {
+    std::cout << "argv[" << i << "]=(" << argv[i] << ")" << std::endl;
+  }
+  return 1;
+}