Move `detect_native_windows_arch()` to `mesonlib/universal.py` and
rename it to `windows_detect_native_arch()`
Use `IsWow64Process2()` to detect native architecture if available
Use native `vcvarsarm64.bat` to initialize vsenv if available
Those classes are used by wrapper scripts and we should not have to
import the rest of mesonlib, build.py, and all their dependencies for
that.
This renames mesonlib/ directory to utils/ and add a mesonlib.py module
that imports everything from utils/ to not have to change `import
mesonlib` everywhere. It allows to import utils.core without importing
the rest of mesonlib.
The tests and the unittests both unconditionally call setup_vsenv()
because all tests are run using the backend commands directly: ninja,
msbuild, etc.
There's no way to undo this vs env setup, so the only way to test that
--vsenv works is by:
1. Removing all paths in PATH that provide ninja
2. Changing setup_vsenv(force=True) to forcibly set-up a new vsenv
when MESON_FORCE_VSENV_FOR_UNITTEST is set
3. Mock-patching build_command, test_command, install_command to use
`meson` instead of `ninja`
4. Asserting that 'Activating VS' is in the output for all commands
5. Ensure that compilation works because ninja is picked up from the
vs env.
I manually checked that this test actually does fail when the previous
commit is reverted.
Visual Studio Express does not come with the
'Microsoft.VisualStudio.Component.VC.Tools.x86.x64' workload.
This adds a check for the 'Microsoft.VisualStudio.Workload.WDExpress'
workload. Non-express versions take precedence over express versions
when activating.
NamedTemporaryFile can't be opened by name on Windows.
For Windows the created temporary bat file is now closed before
passing to a subprocess, prevented from removal automatically upon
close and deleted explicitly upon finish.
The `except` line was missing its `as e` clause.
As a result, when erroring out, after not finding a compiler, Meson
gives an error ending:
```
File "C:\Users\Matthew\AppData\Roaming\Python\Python39\site-packages\mesonbuild\mesonlib\vsenv.py",
line 100, in setup_vsenv
mlog.warning('Failed to activate VS environment:', str(e))
```
GustavoLCR
Xavier Claessens
Denis Fortin
Eli Schwartz
Nazar Mokrynskyi
Nirbheek Chauhan
DFOVIT
Gabor Kertesz
Matthew Brett