Support swift plugins in mixed_language_library (#1493)

Author: qyang-nj

doc/rules.md

@@ -1067,8 +1067,8 @@ swift_library(
 mixed_language_library(<a href="#mixed_language_library-name">name</a>, <a href="#mixed_language_library-alwayslink">alwayslink</a>, <a href="#mixed_language_library-clang_copts">clang_copts</a>, <a href="#mixed_language_library-clang_defines">clang_defines</a>, <a href="#mixed_language_library-clang_srcs">clang_srcs</a>, <a href="#mixed_language_library-data">data</a>,
                        <a href="#mixed_language_library-enable_modules">enable_modules</a>, <a href="#mixed_language_library-hdrs">hdrs</a>, <a href="#mixed_language_library-includes">includes</a>, <a href="#mixed_language_library-linkopts">linkopts</a>, <a href="#mixed_language_library-module_map">module_map</a>, <a href="#mixed_language_library-module_name">module_name</a>,
                        <a href="#mixed_language_library-non_arc_srcs">non_arc_srcs</a>, <a href="#mixed_language_library-package_name">package_name</a>, <a href="#mixed_language_library-private_deps">private_deps</a>, <a href="#mixed_language_library-sdk_dylibs">sdk_dylibs</a>, <a href="#mixed_language_library-sdk_frameworks">sdk_frameworks</a>,
-                       <a href="#mixed_language_library-swift_copts">swift_copts</a>, <a href="#mixed_language_library-swift_defines">swift_defines</a>, <a href="#mixed_language_library-swift_srcs">swift_srcs</a>, <a href="#mixed_language_library-swiftc_inputs">swiftc_inputs</a>, <a href="#mixed_language_library-textual_hdrs">textual_hdrs</a>,
-                       <a href="#mixed_language_library-umbrella_header">umbrella_header</a>, <a href="#mixed_language_library-weak_sdk_frameworks">weak_sdk_frameworks</a>, <a href="#mixed_language_library-deps">deps</a>, <a href="#mixed_language_library-kwargs">kwargs</a>)
+                       <a href="#mixed_language_library-swift_copts">swift_copts</a>, <a href="#mixed_language_library-swift_defines">swift_defines</a>, <a href="#mixed_language_library-swift_plugins">swift_plugins</a>, <a href="#mixed_language_library-swift_srcs">swift_srcs</a>, <a href="#mixed_language_library-swiftc_inputs">swiftc_inputs</a>,
+                       <a href="#mixed_language_library-textual_hdrs">textual_hdrs</a>, <a href="#mixed_language_library-umbrella_header">umbrella_header</a>, <a href="#mixed_language_library-weak_sdk_frameworks">weak_sdk_frameworks</a>, <a href="#mixed_language_library-deps">deps</a>, <a href="#mixed_language_library-kwargs">kwargs</a>)
 </pre>
 
 Creates a mixed language library from a Clang and Swift library target     pair.
@@ -1101,6 +1101,7 @@ Once that is the case, this macro will be deprecated.
 | <a id="mixed_language_library-sdk_frameworks"></a>sdk_frameworks |  A list of SDK frameworks to link with (e.g. "AddressBook", "QuartzCore").<br><br>When linking a top level Apple binary, all SDK frameworks listed in that binary's transitive dependency graph are linked.   |  `[]` |
 | <a id="mixed_language_library-swift_copts"></a>swift_copts |  The compiler flags for the swift library.   |  `[]` |
 | <a id="mixed_language_library-swift_defines"></a>swift_defines |  A list of Swift defines to add to the compilation command line.<br><br>Note that unlike C-family languages, Swift defines do not have values; they are simply identifiers that are either defined or undefined. So strings in this list should be simple identifiers, not `name=value` pairs.<br><br>Each string is prepended with `-D` and added to the command line. Unlike `swift_copts`, these flags are added for the target and every target that depends on it, so use this attribute with caution. It is preferred that you add defines directly to `swift_copts`, only using this feature in the rare case that a library needs to propagate a symbol up to those that depend on it.   |  `[]` |
+| <a id="mixed_language_library-swift_plugins"></a>swift_plugins |  A list of Swift plugins for the swift library.   |  `[]` |
 | <a id="mixed_language_library-swift_srcs"></a>swift_srcs |  The sources for the swift library.   |  none |
 | <a id="mixed_language_library-swiftc_inputs"></a>swiftc_inputs |  Additional files that are referenced using `$(location ...)` in attributes that support location expansion.   |  `[]` |
 | <a id="mixed_language_library-textual_hdrs"></a>textual_hdrs |  The list of C, C++, Objective-C, or Objective-C++ files that are included as headers by source files in this rule or by users of this library. Unlike `hdrs`, these will not be compiled separately from the sources.   |  `[]` |

mixed_language/mixed_language_library.bzl

@@ -53,6 +53,7 @@ def mixed_language_library(
         sdk_frameworks = [],
         swift_copts = [],
         swift_defines = [],
+        swift_plugins = [],
         swift_srcs,
         swiftc_inputs = [],
         textual_hdrs = [],
@@ -152,6 +153,7 @@ def mixed_language_library(
             It is preferred that you add defines directly to `swift_copts`, only
             using this feature in the rare case that a library needs to
             propagate a symbol up to those that depend on it.
+        swift_plugins: A list of Swift plugins for the swift library.
         swift_srcs: The sources for the swift library.
         swiftc_inputs: Additional files that are referenced using
             `$(location ...)` in attributes that support location expansion.
@@ -319,6 +321,7 @@ a mixed language Swift library, use a clang only library rule like \
         linkopts = linkopts,
         module_name = module_name,
         package_name = package_name,
+        plugins = swift_plugins,
         private_deps = private_deps,
         swiftc_inputs = swiftc_inputs,
         tags = internal_tags,