Add support for x_warning_level (#1391)

* Add support for x_warning_level

* Docs

* Better docs

* Better docs

Author: Bencodes

docs/kotlin.md

@@ -394,7 +394,8 @@ kt_kotlinc_options(<a href="#kt_kotlinc_options-name">name</a>, <a href="#kt_kot
                    <a href="#kt_kotlinc_options-x_no_param_assertions">x_no_param_assertions</a>, <a href="#kt_kotlinc_options-x_no_receiver_assertions">x_no_receiver_assertions</a>, <a href="#kt_kotlinc_options-x_no_source_debug_extension">x_no_source_debug_extension</a>,
                    <a href="#kt_kotlinc_options-x_optin">x_optin</a>, <a href="#kt_kotlinc_options-x_report_perf">x_report_perf</a>, <a href="#kt_kotlinc_options-x_sam_conversions">x_sam_conversions</a>, <a href="#kt_kotlinc_options-x_skip_prerelease_check">x_skip_prerelease_check</a>,
                    <a href="#kt_kotlinc_options-x_suppress_version_warnings">x_suppress_version_warnings</a>, <a href="#kt_kotlinc_options-x_suppress_warning">x_suppress_warning</a>,
-                   <a href="#kt_kotlinc_options-x_type_enhancement_improvements_strict_mode">x_type_enhancement_improvements_strict_mode</a>, <a href="#kt_kotlinc_options-x_use_fir_lt">x_use_fir_lt</a>, <a href="#kt_kotlinc_options-x_use_k2">x_use_k2</a>)
+                   <a href="#kt_kotlinc_options-x_type_enhancement_improvements_strict_mode">x_type_enhancement_improvements_strict_mode</a>, <a href="#kt_kotlinc_options-x_use_fir_lt">x_use_fir_lt</a>, <a href="#kt_kotlinc_options-x_use_k2">x_use_k2</a>,
+                   <a href="#kt_kotlinc_options-x_warning_level">x_warning_level</a>)
 </pre>
 
 Define kotlin compiler options.
@@ -439,6 +440,7 @@ Define kotlin compiler options.
 | <a id="kt_kotlinc_options-x_type_enhancement_improvements_strict_mode"></a>x_type_enhancement_improvements_strict_mode |  Enables strict mode for type enhancement improvements, enforcing stricter type checking and enhancements.   | Boolean | optional |  `False`  |
 | <a id="kt_kotlinc_options-x_use_fir_lt"></a>x_use_fir_lt |  Compile using LightTree parser with Front-end IR. Warning: this feature is far from being production-ready   | Boolean | optional |  `False`  |
 | <a id="kt_kotlinc_options-x_use_k2"></a>x_use_k2 |  Compile using experimental K2. K2 is a new compiler pipeline, no compatibility guarantees are yet provided   | Boolean | optional |  `False`  |
+| <a id="kt_kotlinc_options-x_warning_level"></a>x_warning_level |  Suppress specific warnings globally. Ex: 'OPTION': '(error\|warning\|disabled)'   | <a href="https://bazel.build/rules/lib/dict">Dictionary: String -> String</a> | optional |  `{}`  |
 
 
 <a id="kt_ksp_plugin"></a>

src/main/starlark/core/options/opts.kotlinc.bzl

@@ -16,6 +16,23 @@ load("@com_github_jetbrains_kotlin//:capabilities.bzl", _KOTLIN_OPTS = "KOTLIN_O
 load("//src/main/starlark/core/options:convert.bzl", "convert")
 load("//src/main/starlark/core/options:derive.bzl", "derive")
 
+_ALLOWED_SUPPRESS_LEVELS = [
+    "error",
+    "warning",
+    "disabled",
+]
+
+def _map_warning_level(values):
+    if not values:
+        return None
+
+    args = []
+    for k, v in values.items():
+        if v not in _ALLOWED_SUPPRESS_LEVELS:
+            fail("Error: Suppress key '{}' has an invalid value of '{}'".format(k, v))
+        args.append("-Xwarning-level={}:{}".format(k, v))
+    return args
+
 def _map_optin_class_to_flag(values):
     return ["-opt-in=%s" % v for v in values]
 
@@ -469,6 +486,15 @@ default: 'first-only-warn' in language version 2.2+, 'first-only' in version 2.1
             True: ["-Xuse-k2"],
         },
     ),
+    "x_warning_level": struct(
+        args = dict(
+            default = {},
+            doc = "Suppress specific warnings globally. Ex: 'OPTION': '(error|warning|disabled)'",
+        ),
+        type = attr.string_dict,
+        value_to_flag = None,
+        map_value_to_flag = _map_warning_level,
+    ),
 }
 
 def _merge(key, rule_defined):