fix: support wider range of verbosity settings on other build backends

cibuildwheel/frontend.py

@@ -37,14 +37,19 @@ def options_summary(self) -> str | dict[str, str]:
 
 
 def _get_verbosity_flags(level: int, frontend: BuildFrontendName) -> list[str]:
-    if frontend == "pip":
-        if level > 0:
-            return ["-" + level * "v"]
-        if level < 0:
+    if level < 0:
+        if frontend == "pip":
             return ["-" + -level * "q"]
-    elif not 0 <= level < 2:
+
         msg = f"build_verbosity {level} is not supported for {frontend} frontend. Ignoring."
         log.warning(msg)
+
+    if level > 0:
+        if frontend == "pip":
+            return ["-" + level * "v"]
+        if level > 1:
+            return ["-" + (level - 1) * "v"]
+
     return []
 
 

docs/options.md

@@ -1760,9 +1760,27 @@ export CIBW_DEBUG_TRACEBACK=TRUE
 ```
 
 ### `CIBW_BUILD_VERBOSITY` {: #build-verbosity}
-> Increase/decrease the output of pip wheel
-
-A number from 1 to 3 to increase the level of verbosity (corresponding to invoking pip with `-v`, `-vv`, and `-vvv`), between -1 and -3 (`-q`, `-qq`, and `-qqq`), or just 0 (default verbosity). These flags are useful while debugging a build when the output of the actual build invoked by `pip wheel` is required. Has no effect on the `build` backend, which produces verbose output by default.
+> Increase/decrease the output of the build
+
+This setting controls `-v`/`-q` flags to the build frontend. Since there is
+no communication between the build backend and the build frontend, build
+messages from the build backend will always be shown with `1`; higher levels
+will not produce more logging about the build itself. Other levels only affect
+the build frontend output, which is usually things like resolving and
+downloading dependencies. The settings are:
+
+|             | build | pip    | desc                             |
+|-------------|-------|--------|----------------------------------|
+| -2          | N/A   | `-qq`  | even more quiet, where supported |
+| -1          | N/A   | `-q`   | quiet mode, where supported      |
+| 0 (default) |       |        | default for build tool           |
+| 1           |       | `-v`   | print backend output             |
+| 2           | `-v`  | `-vv`  | print log messages e.g. resolving info |
+| 3           | `-vv` | `-vvv` | print even more debug info       |
+
+Settings that are not supported for a specific frontend will log a warning.
+The default build frontend is `build`, which does show build backend output by
+default.
 
 Platform-specific environment variables are also available:<br/>
 `CIBW_BUILD_VERBOSITY_MACOS` | `CIBW_BUILD_VERBOSITY_WINDOWS` | `CIBW_BUILD_VERBOSITY_LINUX` | `CIBW_BUILD_VERBOSITY_IOS` | `CIBW_BUILD_VERBOSITY_PYODIDE`
@@ -1772,15 +1790,15 @@ Platform-specific environment variables are also available:<br/>
 !!! tab examples "Environment variables"
 
     ```yaml
-    # Increase pip debugging output
+    # Ensure that the build backend output is present
     CIBW_BUILD_VERBOSITY: 1
     ```
 
 !!! tab examples "pyproject.toml"
 
     ```toml
     [tool.cibuildwheel]
-    # Increase pip debugging output
+    # Ensure that the build backend output is present
     build-verbosity = 1
     ```
 

unit_test/options_test.py

@@ -1,12 +1,16 @@
 import os
 import platform as platform_module
 import textwrap
+import unittest.mock
 from pathlib import Path
+from typing import Literal
 
 import pytest
 
 from cibuildwheel import errors
 from cibuildwheel.bashlex_eval import local_environment_executor
+from cibuildwheel.frontend import BuildFrontendConfig, get_build_frontend_extra_flags
+from cibuildwheel.logger import Logger
 from cibuildwheel.options import (
     CommandLineArguments,
     Options,
@@ -570,3 +574,47 @@ def test_deprecated_image(
         assert f"{resolved_image!r}" in captured.err
     else:
         assert "Deprecated image" not in captured.err
+
+
+@pytest.mark.parametrize(
+    ("frontend", "verbosity", "result"),
+    [
+        ("pip", 3, ["-Ca", "-Cb", "-1", "-vvv"]),
+        ("pip", 2, ["-Ca", "-Cb", "-1", "-vv"]),
+        ("pip", -1, ["-Ca", "-Cb", "-1", "-q"]),
+        ("build", 0, ["-Ca", "-Cb", "-1"]),
+        ("build", 1, ["-Ca", "-Cb", "-1"]),
+        ("build", 2, ["-Ca", "-Cb", "-1", "-v"]),
+        ("build", 3, ["-Ca", "-Cb", "-1", "-vv"]),
+        ("build[uv]", 3, ["-Ca", "-Cb", "-1", "-vv"]),
+    ],
+)
+def test_get_build_frontend_extra_flags(
+    frontend: Literal["pip", "build", "build[uv]"],
+    verbosity: int,
+    result: list[str],
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    mock_warning = unittest.mock.MagicMock()
+    monkeypatch.setattr(Logger, "warning", mock_warning)
+    build_frontend = BuildFrontendConfig(frontend, ["-1"])
+    args = get_build_frontend_extra_flags(
+        build_frontend=build_frontend, verbosity_level=verbosity, config_settings="a b"
+    )
+
+    assert args == result
+    mock_warning.assert_not_called()
+
+
+@pytest.mark.parametrize("frontend", ["build", "build[uv]"])
+def test_get_build_frontend_extra_flags_warning(
+    frontend: Literal["build", "build[uv]"], monkeypatch: pytest.MonkeyPatch
+) -> None:
+    mock_warning = unittest.mock.MagicMock()
+    monkeypatch.setattr(Logger, "warning", mock_warning)
+    build_frontend = BuildFrontendConfig(frontend, ["-1"])
+    args = get_build_frontend_extra_flags(
+        build_frontend=build_frontend, verbosity_level=-1, config_settings="a b"
+    )
+    assert args == ["-Ca", "-Cb", "-1"]
+    mock_warning.assert_called_once()