[libc++] Move a few XFAILs to UNSUPPORTED for consistency

The wide stream tests should be marked as `UNSUPPORTED: no-wide-characters`,
not XFAIL.

[libc++] Simplify how the global stream tests are written (#66842)

Instead of relying on Bash, use the builtin Lit commands whenever
possible. The motivation is to stop running %t.exe behind Bash,

[libc++] Simplify how the global stream tests are written (#66842)

Instead of relying on Bash, use the builtin Lit commands whenever
possible. The motivation is to stop running %t.exe behind Bash, which
breaks on macOS 13.5 with SIP enabled because DYLD_LIBRARY_PATH isn't
forwarded to the underlying process when running through a protected
process.

For more details, see [1].

[1]: https://developer.apple.com/library/archive/documentation/Security/Conceptual/System_Integrity_Protection_Guide/RuntimeProtections/RuntimeProtections.html

show more ...

[libc++][NFC] Fix synopsis comments in cout tests

[runtimes] Rename various libcpp-has-no-XYZ Lit features to just no-XYZ

Since those features are general properties of the environment, it makes
sense to use them from libc++abi too, and so the name

[runtimes] Rename various libcpp-has-no-XYZ Lit features to just no-XYZ

Since those features are general properties of the environment, it makes
sense to use them from libc++abi too, and so the name libcpp-has-no-xxx
doesn't make sense.

Differential Revision: https://reviews.llvm.org/D126482

show more ...

[libcxx] [test] Extend test for bash for executor-has-no-bash

If %{exec} sets "--env PATH=single-dir", the directory containing
bash and related shell utils is omitted from the path, which means
tha

[libcxx] [test] Extend test for bash for executor-has-no-bash

If %{exec} sets "--env PATH=single-dir", the directory containing
bash and related shell utils is omitted from the path, which means
that most shell scripts would fail.

(Setting PATH is needed for DLL builds on Windows; PATH fills the same
role as e.g. LD_LIBRARY_PATH on Linux.)

This condition is missed in the current test, because the executor
run.py first resolves the executable to run using the original path,
then invokes that executable with an environment with a restricted
path. Thus the executor is able to run bash, but that bash is then
unable to run further shell commands (other than bash builtins).

Extend the test from "bash --version" to "bash -c 'bash --version'".
This correctly identifies the executor-has-no-bash condition in the
current Windows CI configs, allowing removing 6 cases of
LIBCXX-WINDOWS-FIXME.

Another longterm fix would be to extend run.py with an option like
"--env-prepend PATH=dir", to allow keeping the current path while
adding a directory to it.

Differential Revision: https://reviews.llvm.org/D116117

show more ...

[libc++] Allow detecting whether the executor supports Bash

A few tests in the test suite require support for Bash. For example,
tests that run a program and send data through stdin to it require so

[libc++] Allow detecting whether the executor supports Bash

A few tests in the test suite require support for Bash. For example,
tests that run a program and send data through stdin to it require some
way of piping the data in, and we use a Bash script for that.

However, some executors (e.g. an embedded systems simulator) do not
support Bash, so these tests will fail. This commit adds a Lit feature
that tries to detect whether Bash is available through conventional
means, and disables the tests that require it otherwise.

Differential Revision: https://reviews.llvm.org/D114612

show more ...

[libc++] Add an option to disable wide character support in libc++

Some embedded platforms do not wish to support the C library functionality
for handling wchar_t because they have no use for it. It

[libc++] Add an option to disable wide character support in libc++

Some embedded platforms do not wish to support the C library functionality
for handling wchar_t because they have no use for it. It makes sense for
libc++ to work properly on those platforms, so this commit adds a carve-out
of functionality for wchar_t.

Unfortunately, unlike some other carve-outs (e.g. random device), this
patch touches several parts of the library. However, despite the wide
impact of this patch, I still think it is important to support this
configuration since it makes it much simpler to port libc++ to some
embedded platforms.

Differential Revision: https://reviews.llvm.org/D111265

show more ...

[libc++][NFC] Remove remnants of _LIBCPP_HAS_NO_STDOUT, which should have been removed by 87dd51983cf9

[libcxx] [test] Add XFAIL LIBCXX-WINDOWS-FIXME in 124 tests that fail in the future CI configuration

This makes no attempt yet to look into the why/what for each of them,
but makes the CI configurat

[libcxx] [test] Add XFAIL LIBCXX-WINDOWS-FIXME in 124 tests that fail in the future CI configuration

This makes no attempt yet to look into the why/what for each of them,
but makes the CI configuration useful for tracking further regressions.
After looking into each case, they can either be fixed, or converted
into UNSUPPORTED: windows or XFAIL: windows, once the cause is known
and explained.

A number of the filesystem cases can be fixed by patches that are
currently in review.

Differential Revision: https://reviews.llvm.org/D99095

show more ...

[libc++] Harden tests against executors not running tests in a shell

Some executors do not run the tests in a shell, and so assuming that
they can understand shell builtins is wrong. Instead, call B

[libc++] Harden tests against executors not running tests in a shell

Some executors do not run the tests in a shell, and so assuming that
they can understand shell builtins is wrong. Instead, call Bash
directly to do what we need to do.

This still requires the executor to be able to run Bash, but at least
it does not require it to interpret command lines in the Bash language.

show more ...

[libc++] Consider everything inside %T to be a dependency of each test

Instead of passing file dependencies individually, assume that the
whole content of the unique test directory is a dependency.

[libc++] Consider everything inside %T to be a dependency of each test

Instead of passing file dependencies individually, assume that the
whole content of the unique test directory is a dependency. This
simplifies the test harness significantly, by making %T the directory
that contains everything required to run a test. This also removes the
need for the %{file_dependencies} substitution, which is removed by this
patch.

Furthermore, this patch also changes the harness to execute tests locally
inside %T, so as to avoid creating a separate directory for no purpose.

show more ...

[libc++] Rewrite the tests for cin, cout, clog, cerr and friends

The tests were disabled with `#if 0`, most likely because there was no
way of writing shell tests when they were first written.