Add Bazel build (#101)

* Add initial Bazel build

* Add README for Bazel build

* Use external registry for Bazel modules

* Fix Bazel build on Windows

Removes an unused .bzl file and fixes incompatible copts on Windows.

* Prepare for BCR-hosted rules_libusb

* Explicitly enable exceptions in Bazel build

* Ready for BCR-provided dependencies

* Set Bazel versions to 1.1.3-rc1

* Add Windows linking fix

* Link to Bazelisk in Bazel getting started instructions

* Apply buildifier formatting fixes

* Add missing platforms dependency

Adds a missing bzlmod dep on `platforms` to fix https://pwbug.dev/258836641

---------

Co-authored-by: Ted Pudlik <[email protected]>

.bazelrc

@@ -0,0 +1 @@
+common --verbose_failures

.gitignore

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+bazel-*
+
+# Ignore until https://github.com/bazelbuild/bazel/issues/20369 is fixed.
+MODULE.bazel.lock

BUILD.bazel

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+package(default_visibility = ["//visibility:public"])
+
+cc_binary(
+    name = "picotool",
+    srcs = [
+        "cli.h",
+        "clipp/clipp.h",
+        "elf.h",
+        "main.cpp",
+        "picoboot_connection/picoboot_connection.c",
+        "picoboot_connection/picoboot_connection.h",
+        "picoboot_connection/picoboot_connection_cxx.cpp",
+        "picoboot_connection/picoboot_connection_cxx.h",
+    ],
+    copts = select({
+        "@platforms//os:windows": [],
+        "//conditions:default": [
+            "-fexceptions",
+            "-Wno-delete-non-abstract-non-virtual-dtor",
+            "-Wno-reorder-ctor",
+            "-Wno-unused-variable",
+        ],
+    }),
+    # TODO: There's probably a nicer way to do share this with CMake.
+    defines = [
+        'PICOTOOL_VERSION=\\"1.1.3-rc1\\"',
+        'SYSTEM_VERSION=\\"host\\"',
+        'COMPILER_INFO=\\"local\\"',
+    ],
+    # Windows does not behave nicely with the automagic force_dynamic_linkage_enabled.
+    dynamic_deps = select({
+        "@rules_libusb//:force_dynamic_linkage_enabled": ["@libusb//:libusb_dynamic"],
+        "//conditions:default": [],
+    }),
+    includes = ["picoboot_connection"],
+    deps = [
+        "@libusb",
+        "@pico-sdk//src/common/boot_picoboot:boot_picoboot",
+        "@pico-sdk//src/common/boot_uf2:boot_uf2",
+        "@pico-sdk//src/common/pico_base:platform_defs",
+        "@pico-sdk//src/common/pico_binary_info:pico_binary_info",
+        "@pico-sdk//src/rp2_common/pico_stdio_usb:reset_interface_headers",
+    ],
+)

MODULE.bazel

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+module(name = "picotool", version="1.1.3-rc1")
+
+bazel_dep(name = "rules_libusb", version="0.1.0-rc1")
+bazel_dep(name = "pico-sdk", version="1.6.0-rc1")
+bazel_dep(name = "platforms", version="0.0.7")
+
+libusb = use_extension("@rules_libusb//:extensions.bzl", "libusb")
+libusb.source_release(min_version = "1.0.22")
+use_repo(libusb, "libusb")

bazel/README.md

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+## Prerequisites
+
+You'll need Bazel (v7.0.0 or higher) or Bazelisk (a self-updating Bazel
+launcher) to build the Pico SDK.
+
+We strongly recommend you set up
+[Bazelisk](https://bazel.build/install/bazelisk).
+
+### Linux
+
+Use your favorite package tool to install dependencies. For example, on Ubuntu:
+
+```console
+sudo apt install build-essential libudev-dev
+```
+
+On Linux you can add udev rules in order to run picotool without sudo:
+
+```console
+sudo cp udev/99-picotool.rules /etc/udev/rules.d/
+```
+
+### macOS
+
+To build on macOS, you'll need to ensure Xcode is installed.
+
+```console
+xcode-select --install
+```
+
+### Windows
+
+To build on Windows, you must install [Visual Studio for Desktop Development With C++](https://visualstudio.microsoft.com/vs/features/cplusplus/).
+
+## Building picotool
+
+From the root of the picotool repository, run Bazel with the following command:
+
+```console
+bazelisk build //:picotool
+```
+
+## Running picotool
+
+To run picotool, run the binary built by Bazel:
+
+```console
+./bazel-bin/picotool
+```