Try to match cc_library logic for selecting linker outputs.

GitOrigin-RevId: f8645982ebeeb9e331fa262dd9ed70d9d4654d93

docs/rules_flex.md

@@ -46,7 +46,7 @@ flex(
 ## flex_cc_library
 
 <pre>
-flex_cc_library(<a href="#flex_cc_library-name">name</a>, <a href="#flex_cc_library-deps">deps</a>, <a href="#flex_cc_library-flex_options">flex_options</a>, <a href="#flex_cc_library-include_prefix">include_prefix</a>, <a href="#flex_cc_library-src">src</a>, <a href="#flex_cc_library-strip_include_prefix">strip_include_prefix</a>)
+flex_cc_library(<a href="#flex_cc_library-name">name</a>, <a href="#flex_cc_library-deps">deps</a>, <a href="#flex_cc_library-flex_options">flex_options</a>, <a href="#flex_cc_library-include_prefix">include_prefix</a>, <a href="#flex_cc_library-linkstatic">linkstatic</a>, <a href="#flex_cc_library-src">src</a>, <a href="#flex_cc_library-strip_include_prefix">strip_include_prefix</a>)
 </pre>
 
 Generate a C/C++ library for a Flex lexical analyzer.
@@ -78,6 +78,7 @@ cc_binary(
 | <a id="flex_cc_library-deps"></a>deps |  A list of other C/C++ libraries to depend on.   | <a href="https://bazel.build/concepts/labels">List of labels</a> | optional | <code>[]</code> |
 | <a id="flex_cc_library-flex_options"></a>flex_options |  Additional options to pass to the <code>flex</code> command.<br><br>These will be added to the command args immediately before the source file.   | List of strings | optional | <code>[]</code> |
 | <a id="flex_cc_library-include_prefix"></a>include_prefix |  A prefix to add to the path of the generated header.<br><br>See [<code>cc_library.include_prefix</code>](https://bazel.build/reference/be/c-cpp#cc_library.include_prefix) for more details.   | String | optional | <code>""</code> |
+| <a id="flex_cc_library-linkstatic"></a>linkstatic |  Disable creation of a shared library output.<br><br>See [<code>cc_library.linkstatic</code>](https://bazel.build/reference/be/c-cpp#cc_library.linkstatic) for more details.   | Boolean | optional | <code>False</code> |
 | <a id="flex_cc_library-src"></a>src |  A Flex source file.<br><br>The source's file extension will determine whether Flex operates in C or C++ mode:<ul> <li>Inputs with file extension <code>.l</code> generate outputs <code>{name}.c</code> and <code>{name}.h</code>. </li><li>Inputs with file extension <code>.ll</code>, <code>.l++</code>, <code>.lxx</code>, or <code>.lpp</code> generate output     <code>{name}.cc</code>. This is equivalent to invoking Flex as <code>flex++</code>.</ul>The C++ output depends on <code>FlexLexer.h</code>, which is part of the Flex source distribution and may be obtained from the Flex toolchain.   | <a href="https://bazel.build/concepts/labels">Label</a> | required |</li>  |
 | <a id="flex_cc_library-strip_include_prefix"></a>strip_include_prefix |  A prefix to strip from the path of the generated header.<br><br>See [<code>cc_library.strip_include_prefix</code>](https://bazel.build/reference/be/c-cpp#cc_library.strip_include_prefix) for more details.   | String | optional | <code>""</code> |
 

flex/rules/flex_cc_library.bzl

@@ -67,20 +67,49 @@ def _cc_library(ctx, flex_result):
         **compile_kwargs
     )
 
+    cc_supports_dynamic_linker = cc_common.is_enabled(
+        feature_configuration = cc_feature_configuration,
+        feature_name = "supports_dynamic_linker",
+    )
+
+    allow_dynamic_library = all([
+        cc_supports_dynamic_linker,
+        not ctx.attr.linkstatic,
+    ])
+
     (cc_linking_context, cc_linking_outputs) = cc_common.create_linking_context_from_compilation_outputs(
         name = ctx.attr.name,
         actions = ctx.actions,
         feature_configuration = cc_feature_configuration,
         cc_toolchain = cc_toolchain,
         compilation_outputs = cc_compilation_outputs,
         linking_contexts = [cc_deps.linking_context],
+        disallow_dynamic_library = not allow_dynamic_library,
+    )
+
+    is_windows = cc_common.is_enabled(
+        feature_configuration = cc_feature_configuration,
+        feature_name = "targets_windows",
     )
 
     outs = []
-    if cc_linking_outputs.library_to_link.static_library:
-        outs.append(cc_linking_outputs.library_to_link.static_library)
-    if cc_linking_outputs.library_to_link.dynamic_library:
-        outs.append(cc_linking_outputs.library_to_link.dynamic_library)
+    if cc_linking_outputs.library_to_link != None:
+        libs = cc_linking_outputs.library_to_link
+        if libs.static_library != None:
+            outs.append(libs.static_library)
+        if libs.pic_static_library != None:
+            outs.append(libs.pic_static_library)
+
+        if not is_windows:
+            if libs.resolved_symlink_dynamic_library != None:
+                outs.append(libs.resolved_symlink_dynamic_library)
+            elif libs.dynamic_library != None:
+                outs.append(libs.dynamic_library)
+
+            if libs.resolved_symlink_interface_library != None:
+                outs.append(libs.resolved_symlink_interface_library)
+            elif libs.interface_library != None:
+                outs.append(libs.interface_library)
 
     return struct(
         outs = depset(direct = outs),
@@ -136,6 +165,14 @@ for more details.
 
 See [`cc_library.strip_include_prefix`](https://bazel.build/reference/be/c-cpp#cc_library.strip_include_prefix)
 for more details.
+""",
+        ),
+        "linkstatic": attr.bool(
+            default = False,
+            doc = """Disable creation of a shared library output.
+
+See [`cc_library.linkstatic`](https://bazel.build/reference/be/c-cpp#cc_library.linkstatic)
+for more details.
 """,
         ),
         "_cc_toolchain": attr.label(