[bazel] Build processstarter with bazel too (#8143)

BUILD.bazel

@@ -65,6 +65,7 @@ publish_all(
         "//datalog:datalog-java_publish",
         "//datalogtool:datalogtool_publish",
         "//epilogue-processor:processor-java_publish",
+        "//processstarter:processstarter_publish",
         "//epilogue-runtime:epilogue-java_publish",
         "//fieldImages:fieldImages-cpp_publish",
         "//fieldImages:fieldImages-java_publish",

processstarter/BUILD.bazel

@@ -0,0 +1,54 @@
+load("@rules_cc//cc:cc_binary.bzl", "cc_binary")
+load("//shared/bazel/rules:objectivec_rules.bzl", "wpilib_objc_library")
+load("//shared/bazel/rules:packaging.bzl", "package_binary_cc_project")
+
+WIN_SRCS = glob([
+    "src/main/native/windows/**/*.cpp",
+    "src/main/native/windows/**/*.h",
+])
+
+LINUX_SRCS = glob([
+    "src/main/native/linux/**/*.cpp",
+    "src/main/native/linux/**/*.h",
+])
+
+MAC_SRCS = glob([
+    "src/main/native/osx/**/*.mm",
+    "src/main/native/osx/**/*.h",
+])
+
+filegroup(
+    name = "native-srcs",
+    srcs = select({
+        "@platforms//os:osx": MAC_SRCS,
+        "@platforms//os:windows": WIN_SRCS,
+        "@rules_bzlmodrio_toolchains//constraints/combined:is_linux": LINUX_SRCS,
+    }),
+)
+
+wpilib_objc_library(
+    name = "processstarter-osx",
+    srcs = [":native-srcs"],
+)
+
+cc_binary(
+    name = "processstarter",
+    srcs = select({
+        "@platforms//os:osx": [],
+        "//conditions:default": [":native-srcs"],
+    }),
+    linkopts = select({
+        "@platforms//os:windows": ["-SUBSYSTEM:WINDOWS"],
+        "//conditions:default": [],
+    }),
+    deps = select({
+        "@platforms//os:osx": ["processstarter-osx"],
+        "//conditions:default": [],
+    }),
+)
+
+package_binary_cc_project(
+    name = "processstarter",
+    maven_artifact_name = "processstarter",
+    maven_group_id = "edu.wpi.first.tools",
+)