modules/rust: Add support for string include_directories

Which we support for basically every other case, but not this one.

docs/markdown/Rust-module.md

@@ -3,7 +3,7 @@ short-description: Rust language integration module
 authors:
     - name: Dylan Baker
       email: dylan@pnwbakers.com
-      years: [2020, 2021]
+      years: [2020, 2021, 2022]
 ...
 
 # Rust module
@@ -35,7 +35,7 @@ that automatically.
 Additional, test only dependencies may be passed via the dependencies
 argument.
 
-### bindgen(*, input: string | BuildTarget | [](string | BuildTarget), output: string, include_directories: []include_directories, c_args: []string, args: []string)
+### bindgen(*, input: string | BuildTarget | [](string | BuildTarget), output: string, include_directories: [](include_directories | string), c_args: []string, args: []string)
 
 This function wraps bindgen to simplify creating rust bindings around C
 libraries. This has two advantages over hand-rolling ones own with a
@@ -50,8 +50,8 @@ It takes the following keyword arguments
 - input — A list of Files, Strings, or CustomTargets. The first element is
   the header bindgen will parse, additional elements are dependencies.
 - output — the name of the output rust file
-- include_directories — A list of `include_directories` objects, these are
-  passed to clang as `-I` arguments
+- include_directories — A list of `include_directories` or `string` objects,
+  these are passed to clang as `-I` arguments *(string since 1.0.0)*
 - c_args — A list of string arguments to pass to clang untouched
 - args — A list of string arguments to pass to `bindgen` untouched.
 

docs/markdown/snippets/rust_bindgen_str_include.md

@@ -0,0 +1,4 @@
+## String arguments to the rust.bindgen include_directories argument
+
+Most other cases of include_directories accept strings as well as
+`IncludeDirectory` objects, so lets do that here too for consistancy.

mesonbuild/modules/rust.py

@@ -19,7 +19,7 @@ from . import ExtensionModule, ModuleReturnValue, ModuleInfo
 from .. import mlog
 from ..build import BothLibraries, BuildTarget, CustomTargetIndex, Executable, ExtractedObjects, GeneratedList, IncludeDirs, CustomTarget, StructuredSources
 from ..dependencies import Dependency, ExternalLibrary
-from ..interpreter.type_checking import TEST_KWS, OUTPUT_KW
+from ..interpreter.type_checking import TEST_KWS, OUTPUT_KW, INCLUDE_DIRECTORIES, include_dir_string_new
 from ..interpreterbase import ContainerTypeInfo, InterpreterException, KwargInfo, typed_kwargs, typed_pos_args, noPosargs
 from ..mesonlib import File
 
@@ -167,7 +167,6 @@ class RustModule(ExtensionModule):
         'rust.bindgen',
         KwargInfo('c_args', ContainerTypeInfo(list, str), default=[], listify=True),
         KwargInfo('args', ContainerTypeInfo(list, str), default=[], listify=True),
-        KwargInfo('include_directories', ContainerTypeInfo(list, IncludeDirs), default=[], listify=True),
         KwargInfo(
             'input',
             ContainerTypeInfo(list, (File, GeneratedList, BuildTarget, BothLibraries, ExtractedObjects, CustomTargetIndex, CustomTarget, str), allow_empty=False),
@@ -175,6 +174,7 @@ class RustModule(ExtensionModule):
             listify=True,
             required=True,
         ),
+        INCLUDE_DIRECTORIES.evolve(feature_validator=include_dir_string_new),
         OUTPUT_KW,
     )
     def bindgen(self, state: 'ModuleState', args: T.List, kwargs: 'FuncBindgen') -> ModuleReturnValue:
@@ -195,7 +195,7 @@ class RustModule(ExtensionModule):
                 depends.append(d)
 
         inc_strs: T.List[str] = []
-        for i in kwargs['include_directories']:
+        for i in state.process_include_dirs(kwargs['include_directories']):
             # bindgen always uses clang, so it's safe to hardcode -I here
             inc_strs.extend([f'-I{x}' for x in i.to_string_list(
                 state.environment.get_source_dir(), state.environment.get_build_dir())])

test cases/rust/12 bindgen/meson.build

@@ -1,7 +1,7 @@
 # SPDX-license-identifer: Apache-2.0
 # Copyright © 2021 Intel Corporation
 
-project('rustmod bindgen', ['c', 'rust'])
+project('rustmod bindgen', ['c', 'rust'], meson_version : '>= 0.63')
 
 prog_bindgen = find_program('bindgen', required : false)
 if not prog_bindgen.found()
@@ -27,7 +27,7 @@ rust = import('unstable-rust')
 gen = rust.bindgen(
   input : 'src/header.h',
   output : 'header.rs',
-  include_directories : inc,
+  include_directories : 'include',
 )
 
 # see: https://github.com/mesonbuild/meson/issues/8160

test cases/rust/12 bindgen/test.json

@@ -0,0 +1,7 @@
+{
+  "stdout": [
+    {
+      "line": "test cases/rust/12 bindgen/meson.build:30: WARNING: Project targets '>= 0.63' but uses feature introduced in '1.0.0': include_directories kwarg of type string. Use include_directories('include') instead"
+    }
+  ]
+}