Make Bazel work gain. Add minimalisitc test that verifies the binary …

…can at least report its own version.

.bazelrc

@@ -0,0 +1 @@
+common --noenable_bzlmod

BUILD.bazel

@@ -7,6 +7,7 @@ genrule(
         "//bazel:re2c_config.h",
     ],
     outs = ["config.h"],
+    visibility = ["//bazel:__pkg__"],
     cmd = """
         cat $(location //:CMakeLists.txt) |\\
             sed -rne 's/project\\(re2c VERSION ([^ ]+).*/#define PACKAGE_VERSION "\\1-bootstrap"/p' >> "$@"
@@ -27,10 +28,17 @@ cc_library(
     hdrs = glob([
         "bootstrap/src/**/*.h",
         "src/**/*.h",
-    ]),
+    ], exclude = [
+        "src/test/**",
+    ]) + [
+        "src/test/range/test.h"
+    ],
     srcs = glob([
         "bootstrap/src/**/*.cc",
         "src/**/*.cc",
+    ], exclude = [
+        "src/main.cc",
+        "src/test/**",
     ]),
     deps = [
         "re2c_config_cc",  # Needed for 're2c_config_cc' data files

bazel/BUILD.bazel

@@ -1,7 +1,7 @@
-package(default_visibility = ["//visibility:private"])
-
 load("@bazel_skylib//:bzl_library.bzl", "bzl_library")
 
+package(default_visibility = ["//visibility:private"])
+
 exports_files([
     "re2c_config.h",
 ])
@@ -11,3 +11,12 @@ bzl_library(
     srcs = ["re2c.bzl"],
     visibility = ["//visibility:public"],
 )
+
+sh_test(
+    name = "re2c_bazel_test",
+    srcs = ["re2c_bazel_test.sh"],
+    data = [
+        "//:re2c_config",
+        "//:re2c",
+    ],
+)

bazel/re2c.bzl

@@ -1,4 +1,4 @@
-# re2c generator rules - assuming that re2c is available as '@re2c//:re2c'.
+"""re2c generator rules - assuming that re2c is available as '@re2c//:re2c'."""
 
 load("@bazel_skylib//lib:paths.bzl", "paths")
 

bazel/re2c_bazel_test.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+# Minimalistic test that verifies the binary can run and report its own version.
+
+set -euo pipefail
+
+RE2C_VERSION="$(cat "${TEST_SRCDIR}/re2c/config.h" | sed -rne 's,^#define PACKAGE_VERSION "(.*)"$,\1,p')"
+
+RE2C_BAZEL_VERSION="re2c ${RE2C_VERSION}"
+
+if [[ "$("${TEST_SRCDIR}/re2c/re2c" --version)" == "${RE2C_BAZEL_VERSION}" ]]; then
+  echo "PASS"
+else
+  echo "FAIL"
+  exit 1
+fi