Add flatc

third-party/flatc/BUILD

@@ -0,0 +1,37 @@
+
+genrule(
+    name = "flatc",
+    srcs = [
+        "@flatbuffers_zip//file",
+        "@cmake_tar_gz//file",
+    ],
+    cmd_bash =
+"""
+set -x
+    core_count=`PATH="$$PATH:/usr/sbin" sysctl -n hw.logicalcpu`
+    BUILD_DIR="$(RULEDIR)/build"
+    rm -rf "$$BUILD_DIR"
+    mkdir -p "$$BUILD_DIR"
+
+    CMAKE_DIR="$$(pwd)/$$BUILD_DIR/cmake"
+    rm -rf "$$CMAKE_DIR"
+    mkdir -p "$$CMAKE_DIR"
+    tar -xf "$(location @cmake_tar_gz//file)" -C "$$CMAKE_DIR"
+    
+    tar -xzf "$(location @flatbuffers_zip//file)" --directory "$$BUILD_DIR"
+    pushd "$$BUILD_DIR/flatbuffers-24.12.23"
+    mkdir build
+    cd build
+    PATH="$$PATH:$$CMAKE_DIR/cmake-3.23.1-macos-universal/CMake.app/Contents/bin" cmake .. -DCMAKE_BUILD_TYPE=Release"
+    make -j $$core_count
+    popd
+
+    tar -cf "$(location flatc.tar)" -C "$$BUILD_DIR/flatbuffers-24.12.23/build" .
+""",
+    outs = [
+        "flatc.tar",
+    ],
+    visibility = [
+        "//visibility:public",
+    ]
+)