Build protoc from source

Use the provided sources to build the protoc binary instead of
using the committed binaries.

--
Change-Id: I3df01e9f400e3cebbd1fe3ce74c6142c93c58b6c
Reviewed-on: https://cr.bazel.build/6732
MOS_MIGRATED_REVID=140192644

2 files changed, 9 insertions, 78 deletions

diff --git a/third_party/protobuf/3.0.0/BUILD b/third_party/protobuf/3.0.0/BUILD
index 2a22dbcfad..2e6f89401d 100644
--- a/third_party/protobuf/3.0.0/BUILD
+++ b/third_party/protobuf/3.0.0/BUILD
@@ -18,23 +18,6 @@ filegroup(
     visibility = ["//third_party/protobuf:__pkg__"],
 )
 
-filegroup(
-    name = "protoc",
-    srcs = select({
-        # protoc-windows-x86_64.exe can't deal with long path(length > 260),
-        # so use protoc-mingw.exe instead.
-        "//third_party:windows_mingw": ["protoc-3.0.0-mingw.exe"],
-        "//third_party:windows_msys64_mingw64": ["protoc-3.0.0-mingw.exe"],
-        "//third_party:windows_msys64": ["protoc-3.0.0-mingw.exe"],
-        "//third_party:windows_clang": ["protoc-3.0.0-mingw.exe"],
-        "//third_party:darwin": ["protoc-3.0.0-osx-x86_32.exe"],
-        "//third_party:k8": ["protoc-3.0.0-linux-x86_64.exe"],
-        "//third_party:piii": ["protoc-3.0.0-linux-x86_32.exe"],
-        "//third_party:freebsd": ["protoc-3.0.0-linux-x86_32.exe"],
-        "//third_party:s390x": ["protoc-linux-s390x_64.exe"],
-    }),
-)
-
 java_import(
     name = "protobuf",
     jars = ["protobuf-java-3.0.0.jar"],
@@ -318,3 +301,11 @@ proto_lang_toolchain(
     command_line = "--java_out=shared,immutable:$(OUT)",
     runtime = ":protobuf",
 )
+
+cc_binary(
+    name = "protoc",
+    srcs = ["src/google/protobuf/compiler/main.cc"],
+    linkopts = LINK_OPTS,
+    visibility = ["//visibility:public"],
+    deps = [":protoc_lib"],
+)
diff --git a/third_party/protobuf/README.md b/third_party/protobuf/README.md
index f9e73a9f75..367d542d06 100644
--- a/third_party/protobuf/README.md
+++ b/third_party/protobuf/README.md
@@ -1,68 +1,8 @@
-### Updating binaries other than the Linux 64-bit and MinGW ones
+### Updating the jar binary
 
 1. Go to http://search.maven.org/
 2. Search for g:"com.google.protobuf"
 3. Download the "jar" link from protobuf-java and put them in `<Bazel tree>/third_party/protobuf/<version>`
-4. Download all binaries from "protoc" and put them in `<Bazel tree>/third_party/protobuf/<version>`
-5. Set executable bit: `chmod +x *.exe`
-
-* * *
-### Updating the Linux 64-bit proto compiler
-The 64-bit Linux version of the proto compiler is linked statically. To update it, do
-the following steps on an x86_64 machine:
-
-1. `git clone http://github.com/google/protobuf.git`
-2. `git checkout <tag or commithash>` (e.g. `v3.0.0` or `e8ae137`)
-3. `./autogen.sh`
-4. `LDFLAGS=-static ./configure`
-5. Change `LDFLAGS = -static` to `LDFLAGS = -all-static` in  `src/Makefile`.
-6. `make`
-7. `cp src/protoc <Bazel tree>/third_party/protobuf/<version>/protoc-<version>-linux-x86_64.exe` .
-
-* * *
-### Updating the MinGW proto compiler (64-bit)
-Do this from a MinGW shell ([https://sourceforge.net/projects/msys2/files/]) on
-a Windows machine.
-
-1. Clone the protobuf repo and check out the right commit
-
-   ```sh
-   git clone http://github.com/google/protobuf.git
-   git checkout <tag or commithash>   # e.g. `v3.0.0` or `e8ae137`
-   ```
-
-2. Close all other MSYS/MinGW/Cygwin windows. Kill all running background jobs.
-   This step is optional, but if you have other terminal windows open the next
-   step may print some error messages (though it still seems to work).
-
-3. Install necessary MinGW packages
-
-   ```sh
-   pacman -Syuu autoconf automake libtool curl make gcc unzip
-   ```
-
-4. Configure for static linking and build like you would for Unix
-
-   ```sh
-   ./autogen.sh
-   ./configure --disable-shared   # takes about 2 minutes
-   ./make                         # takes about 11 minutes
-   ```
-
-5. Copy resulting binary
-
-   ```sh
-   cp src/protoc.exe <bazel tree>/third_party/protobuf/protoc-mingw.exe
-   ```
-
-* * *
-### Updating the Linux s390x 64-bit proto compiler
-To add 64-bit Linux s390x version of the statically linked proto compiler, use below steps:
-
-1. Build Protobuf compiler (v3.0.0-beta-2) from https://github.com/google/protobuf.
-2. `cp src/protoc <Bazel tree>/third_party/protobuf/protoc-linux-s390x_64.exe`
-3. `cp src/protoc <Bazel tree>/third_party/protobuf/<version>/protoc-linux-s390x_64.exe`
-
 
 * * *
 ### Updating `protobuf.bzl` and the `src/` directory: