Hook up pio version string in Bazel build

test/kitchen_sink/BUILD.bazel

@@ -1,4 +1,4 @@
-load("//bazel:defs.bzl", "compatible_with_rp2")
+load("//bazel:defs.bzl", "compatible_with_rp2", "pico_generate_pio_header")
 load("//bazel/util:transition.bzl", "kitchen_sink_test_binary")
 
 package(default_visibility = ["//visibility:public"])
@@ -21,6 +21,11 @@ cc_library(
     includes = ["."],
 )
 
+pico_generate_pio_header(
+    name = "trivial_pio_test",
+    srcs = ["trivial.pio"],
+)
+
 cc_library(
     name = "kitchen_sink_common",
     testonly = True,

tools/pioasm/BUILD.bazel

@@ -1,3 +1,5 @@
+load("@bazel_skylib//rules:expand_template.bzl", "expand_template")
+
 package(default_visibility = ["//visibility:public"])
 
 # TODO: No support for building the parser.
@@ -19,6 +21,7 @@ cc_library(
         "pio_disassembler.h",
         "pio_enums.h",
         "pio_types.h",
+        ":version",
     ],
     copts = select({
         "@rules_cc//cc/compiler:msvc-cl": ["/std:c++20"],
@@ -63,6 +66,15 @@ cc_library(
     alwayslink = True,
 )
 
+expand_template(
+    name = "version",
+    template = "version.h.in",
+    substitutions = {
+        "${PIOASM_VERSION_STRING}": module_version() if module_version() != None else "0.0.1-WORKSPACE",
+    },
+    out = "gen/version.h",
+)
+
 cc_binary(
     name = "pioasm",
     deps = [