feat: support config-settings

cibuildwheel/linux.py

@@ -20,6 +20,7 @@
     get_build_verbosity_extra_flags,
     prepare_command,
     read_python_configs,
+    split_config_settings,
     unwrap,
 )
 
@@ -212,8 +213,10 @@ def build_in_container(
             container.call(["mkdir", "-p", built_wheel_dir])
 
             verbosity_flags = get_build_verbosity_extra_flags(build_options.build_verbosity)
+            extra_flags = split_config_settings(build_options.config_settings)
 
             if build_options.build_frontend == "pip":
+                extra_flags += verbosity_flags
                 container.call(
                     [
                         "python",
@@ -223,12 +226,13 @@ def build_in_container(
                         container_package_dir,
                         f"--wheel-dir={built_wheel_dir}",
                         "--no-deps",
-                        *verbosity_flags,
+                        *extra_flags,
                     ],
                     env=env,
                 )
             elif build_options.build_frontend == "build":
-                config_setting = " ".join(verbosity_flags)
+                verbosity_setting = " ".join(verbosity_flags)
+                extra_flags += (f"--config-setting={verbosity_setting}",)
                 container.call(
                     [
                         "python",
@@ -237,7 +241,7 @@ def build_in_container(
                         container_package_dir,
                         "--wheel",
                         f"--outdir={built_wheel_dir}",
-                        f"--config-setting={config_setting}",
+                        *extra_flags,
                     ],
                     env=env,
                 )

cibuildwheel/macos.py

@@ -34,6 +34,7 @@
     prepare_command,
     read_python_configs,
     shell,
+    split_config_settings,
     unwrap,
     virtualenv,
 )
@@ -345,8 +346,10 @@ def build(options: Options, tmp_path: Path) -> None:
                 built_wheel_dir.mkdir()
 
                 verbosity_flags = get_build_verbosity_extra_flags(build_options.build_verbosity)
+                extra_flags = split_config_settings(build_options.config_settings)
 
                 if build_options.build_frontend == "pip":
+                    extra_flags += verbosity_flags
                     # Path.resolve() is needed. Without it pip wheel may try to fetch package from pypi.org
                     # see https://github.com/pypa/cibuildwheel/pull/369
                     call(
@@ -357,11 +360,12 @@ def build(options: Options, tmp_path: Path) -> None:
                         build_options.package_dir.resolve(),
                         f"--wheel-dir={built_wheel_dir}",
                         "--no-deps",
-                        *verbosity_flags,
+                        *extra_flags,
                         env=env,
                     )
                 elif build_options.build_frontend == "build":
-                    config_setting = " ".join(verbosity_flags)
+                    verbosity_setting = " ".join(verbosity_flags)
+                    extra_flags += (f"--config-setting={verbosity_setting}",)
                     build_env = env.copy()
                     if build_options.dependency_constraints:
                         constraint_path = (
@@ -378,7 +382,7 @@ def build(options: Options, tmp_path: Path) -> None:
                         build_options.package_dir,
                         "--wheel",
                         f"--outdir={built_wheel_dir}",
-                        f"--config-setting={config_setting}",
+                        *extra_flags,
                         env=build_env,
                     )
                 else:

cibuildwheel/options.py

@@ -3,13 +3,14 @@
 import difflib
 import functools
 import os
+import shlex
 import sys
 import traceback
 from configparser import ConfigParser
 from contextlib import contextmanager
 from dataclasses import asdict, dataclass
 from pathlib import Path
-from typing import Any, Dict, Generator, List, Mapping, Union, cast
+from typing import Any, Dict, Generator, Iterator, List, Mapping, Union, cast
 
 if sys.version_info >= (3, 11):
     import tomllib
@@ -77,6 +78,7 @@ class BuildOptions:
     test_extras: str
     build_verbosity: int
     build_frontend: BuildFrontend
+    config_settings: str
 
     @property
     def package_dir(self) -> Path:
@@ -293,8 +295,9 @@ def get(
         accept platform versions of the environment variable. If this is an
         array it will be merged with "sep" before returning. If it is a table,
         it will be formatted with "table['item']" using {k} and {v} and merged
-        with "table['sep']". Empty variables will not override if ignore_empty
-        is True.
+        with "table['sep']". If sep is also given, it will be used for arrays
+        inside the table (must match table['sep']). Empty variables will not
+        override if ignore_empty is True.
         """
 
         if name not in self.default_options and name not in self.default_platform_options:
@@ -324,7 +327,9 @@ def get(
         if isinstance(result, dict):
             if table is None:
                 raise ConfigOptionError(f"{name!r} does not accept a table")
-            return table["sep"].join(table["item"].format(k=k, v=v) for k, v in result.items())
+            return table["sep"].join(
+                item for k, v in result.items() for item in _inner_fmt(k, v, table["item"])
+            )
 
         if isinstance(result, list):
             if sep is None:
@@ -337,6 +342,16 @@ def get(
         return result
 
 
+def _inner_fmt(k: str, v: Any, table_item: str) -> Iterator[str]:
+    if isinstance(v, list):
+        for inner_v in v:
+            qv = shlex.quote(inner_v)
+            yield table_item.format(k=k, v=qv)
+    else:
+        qv = shlex.quote(v)
+        yield table_item.format(k=k, v=qv)
+
+
 class Options:
     def __init__(self, platform: PlatformName, command_line_arguments: CommandLineArguments):
         self.platform = platform
@@ -427,11 +442,14 @@ def build_options(self, identifier: str | None) -> BuildOptions:
 
             build_frontend_str = self.reader.get("build-frontend", env_plat=False)
             environment_config = self.reader.get(
-                "environment", table={"item": '{k}="{v}"', "sep": " "}
+                "environment", table={"item": "{k}={v}", "sep": " "}
             )
             environment_pass = self.reader.get("environment-pass", sep=" ").split()
             before_build = self.reader.get("before-build", sep=" && ")
             repair_command = self.reader.get("repair-wheel-command", sep=" && ")
+            config_settings = self.reader.get(
+                "config-settings", table={"item": "{k}={v}", "sep": " "}
+            )
 
             dependency_versions = self.reader.get("dependency-versions")
             test_command = self.reader.get("test-command", sep=" && ")
@@ -537,6 +555,7 @@ def build_options(self, identifier: str | None) -> BuildOptions:
                 manylinux_images=manylinux_images or None,
                 musllinux_images=musllinux_images or None,
                 build_frontend=build_frontend,
+                config_settings=config_settings,
             )
 
     def check_for_invalid_configuration(self, identifiers: list[str]) -> None:

cibuildwheel/resources/defaults.toml

@@ -5,6 +5,7 @@ test-skip = ""
 
 archs = ["auto"]
 build-frontend = "pip"
+config-settings = {}
 dependency-versions = "pinned"
 environment = {}
 environment-pass = []

cibuildwheel/util.py

@@ -60,6 +60,7 @@
     "strtobool",
     "cached_property",
     "chdir",
+    "split_config_settings",
 ]
 
 resources_dir: Final = Path(__file__).parent / "resources"
@@ -205,6 +206,11 @@ def get_build_verbosity_extra_flags(level: int) -> list[str]:
         return []
 
 
+def split_config_settings(config_settings: str) -> list[str]:
+    config_settings_list = shlex.split(config_settings)
+    return [f"--config-setting={setting}" for setting in config_settings_list]
+
+
 def read_python_configs(config: PlatformName) -> list[dict[str, str]]:
     input_file = resources_dir / "build-platforms.toml"
     with input_file.open("rb") as f:

cibuildwheel/windows.py

@@ -32,6 +32,7 @@
     prepare_command,
     read_python_configs,
     shell,
+    split_config_settings,
     virtualenv,
 )
 
@@ -302,8 +303,10 @@ def build(options: Options, tmp_path: Path) -> None:
                 built_wheel_dir.mkdir()
 
                 verbosity_flags = get_build_verbosity_extra_flags(build_options.build_verbosity)
+                extra_flags = split_config_settings(build_options.config_settings)
 
                 if build_options.build_frontend == "pip":
+                    extra_flags += verbosity_flags
                     # Path.resolve() is needed. Without it pip wheel may try to fetch package from pypi.org
                     # see https://github.com/pypa/cibuildwheel/pull/369
                     call(
@@ -314,11 +317,12 @@ def build(options: Options, tmp_path: Path) -> None:
                         options.globals.package_dir.resolve(),
                         f"--wheel-dir={built_wheel_dir}",
                         "--no-deps",
-                        *get_build_verbosity_extra_flags(build_options.build_verbosity),
+                        *extra_flags,
                         env=env,
                     )
                 elif build_options.build_frontend == "build":
-                    config_setting = " ".join(verbosity_flags)
+                    verbosity_setting = " ".join(verbosity_flags)
+                    extra_flags += (f"--config-setting={verbosity_setting}",)
                     build_env = env.copy()
                     if build_options.dependency_constraints:
                         constraints_path = (
@@ -345,7 +349,7 @@ def build(options: Options, tmp_path: Path) -> None:
                             build_options.package_dir,
                             "--wheel",
                             f"--outdir={built_wheel_dir}",
-                            f"--config-setting={config_setting}",
+                            *extra_flags,
                             env=build_env,
                         )
                 else:

docs/options.md

@@ -517,6 +517,36 @@ Choose which build backend to use. Can either be "pip", which will run
     build-frontend = "pip"
     ```
 
+### `CIBW_CONFIG_SETTINGS` {: #config-settings}
+> Specify config-settings for the build backend.
+
+Specify config settings for the build backend. Each space separated
+item will be passed via `--config-setting`. In TOML, you can specify
+a table of items, including arrays.
+
+!!! tip
+    Currently, "build" supports arrays for options, but "pip" only supports
+    single values.
+
+Platform-specific environment variables also available:<br/>
+`CIBW_BEFORE_ALL_MACOS` | `CIBW_BEFORE_ALL_WINDOWS` | `CIBW_BEFORE_ALL_LINUX`
+
+
+#### Examples
+
+!!! tab examples "Environment variables"
+
+    ```yaml
+    CIBW_CONFIG_SETTINGS: "--build-option=--use-mypyc"
+    ```
+
+!!! tab examples "pyproject.toml"
+
+    ```toml
+    [tool.cibuildwheel.config-settings]
+    --build-option = "--use-mypyc"
+    ```
+
 
 ### `CIBW_ENVIRONMENT` {: #environment}
 > Set environment variables needed during the build

unit_test/main_tests/main_options_test.py

@@ -14,7 +14,7 @@
 from cibuildwheel.__main__ import main
 from cibuildwheel.environment import ParsedEnvironment
 from cibuildwheel.options import BuildOptions, _get_pinned_container_images
-from cibuildwheel.util import BuildSelector, resources_dir
+from cibuildwheel.util import BuildSelector, resources_dir, split_config_settings
 
 # CIBW_PLATFORM is tested in main_platform_test.py
 
@@ -263,6 +263,27 @@ def test_build_verbosity(
     assert build_options.build_verbosity == expected_verbosity
 
 
+@pytest.mark.parametrize("platform_specific", [False, True])
+def test_config_settings(platform_specific, platform, intercepted_build_args, monkeypatch):
+    config_settings = 'setting=value setting=value2 other="something else"'
+    if platform_specific:
+        monkeypatch.setenv("CIBW_CONFIG_SETTINGS_" + platform.upper(), config_settings)
+        monkeypatch.setenv("CIBW_CONFIG_SETTIGNS", "a=b")
+    else:
+        monkeypatch.setenv("CIBW_CONFIG_SETTINGS", config_settings)
+
+    main()
+    build_options = intercepted_build_args.args[0].build_options(identifier=None)
+
+    assert build_options.config_settings == config_settings
+
+    assert split_config_settings(config_settings) == [
+        "--config-setting=setting=value",
+        "--config-setting=setting=value2",
+        "--config-setting=other=something else",
+    ]
+
+
 @pytest.mark.parametrize(
     "selector",
     [

unit_test/options_test.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import platform as platform_module
+import textwrap
 
 import pytest
 
@@ -58,7 +59,7 @@ def test_options_1(tmp_path, monkeypatch):
 
     default_build_options = options.build_options(identifier=None)
 
-    assert default_build_options.environment == parse_environment('FOO="BAR"')
+    assert default_build_options.environment == parse_environment("FOO=BAR")
 
     all_pinned_container_images = _get_pinned_container_images()
     pinned_x86_64_container_image = all_pinned_container_images["x86_64"]
@@ -116,3 +117,32 @@ def test_passthrough_evil(tmp_path, monkeypatch, env_var_value):
     monkeypatch.setenv("ENV_VAR", env_var_value)
     parsed_environment = options.build_options(identifier=None).environment
     assert parsed_environment.as_dictionary(prev_environment={}) == {"ENV_VAR": env_var_value}
+
+
+@pytest.mark.parametrize(
+    "env_var_value",
+    [
+        "normal value",
+        '"value wrapped in quotes"',
+        'an unclosed double-quote: "',
+        "string\nwith\ncarriage\nreturns\n",
+        "a trailing backslash \\",
+    ],
+)
+def test_toml_environment_evil(tmp_path, monkeypatch, env_var_value):
+    args = get_default_command_line_arguments()
+    args.package_dir = tmp_path
+
+    with tmp_path.joinpath("pyproject.toml").open("w") as f:
+        f.write(
+            textwrap.dedent(
+                f"""\
+        [tool.cibuildwheel.environment]
+        EXAMPLE='''{env_var_value}'''
+        """
+            )
+        )
+
+    options = Options(platform="linux", command_line_arguments=args)
+    parsed_environment = options.build_options(identifier=None).environment
+    assert parsed_environment.as_dictionary(prev_environment={}) == {"EXAMPLE": env_var_value}