Previously, the configuration worked fine, but the compiler raised an
error. Now, we explicitly check for the existence of files and print a
useful error message if they do not exist.
This seems to be related to deleting the current working directory.
Simply deleting all of the trees inside the build directory instead
seems to fix it. This only appears with some combination of generated
targets, running the test case against say "1 trivial" doesn't show the
bug.
See this mesa bug: https://bugs.freedesktop.org/show_bug.cgi?id=109071
It is possible that the subproject has been downloaded already, in that
case there is no reason to not use it. If the subproject has not been
downlaoded already it will fail do_subproject().
This comes up now and again when people try do do something like:
meson.build:
```meson
my_sources = ['foo.c']
subdir('subdir')
executable('foo', my_sources)
```
subdir/meson.build:
```meson
my_sources += ['bar.c']
```
The code our projects care about verifying coverage for mostly lives in
the source_root with the exception of the generated source files in
build_root. This change cleans up the output so we don't have prefixed
paths on our source files anymore.
This doesn't touch everything as it's just based on the python3 module
tests, ported to the python module. It's still better than the one very
basic test in the unit test module.
This would normally be exposed by the ExternalProgramHolder, but wasn't
due to the implementation of the PythonInstallation module. Because of
that I've duplicated the method so that we can add the FeatureNew
decorator.
Fixes#4070
Into a generic interpreter object. This isn't a module, it's an object
returned by a module, it also happens to be a special case of an
ExternalProgram, which is a normal interpreter object. Let's treat it
like one.