[libc++] Run picolibc tests with qemu

This patch actually runs the tests for picolibc behind an emulator,
removing a few workarounds and increasing coverage.

Differential Revision: https://reviews.

[libc++] Run picolibc tests with qemu

This patch actually runs the tests for picolibc behind an emulator,
removing a few workarounds and increasing coverage.

Differential Revision: https://reviews.llvm.org/D155521

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[libc++] Add initial support for picolibc

Picolibc is a C Standard Library that is commonly used in embedded
environments. This patch adds initial support for this configuration
along with pre-commi

[libc++] Add initial support for picolibc

Picolibc is a C Standard Library that is commonly used in embedded
environments. This patch adds initial support for this configuration
along with pre-commit CI. As of this patch, the test suite only builds
the tests and nothing is run. A follow-up patch will make the test suite
actually run the tests.

Differential Revision: https://reviews.llvm.org/D154246

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[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

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

[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

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[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

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[libc++] Remove support for CloudABI, which has been abandoned

Based on https://github.com/NuxiNL/cloudlibc, it appears that the CloudABI
project has been abandoned. This patch removes a bunch of Cl

[libc++] Remove support for CloudABI, which has been abandoned

Based on https://github.com/NuxiNL/cloudlibc, it appears that the CloudABI
project has been abandoned. This patch removes a bunch of CloudABI specific
logic that had been added to support that platform.

Note that some knobs like LIBCXX_ENABLE_STDIN and LIBCXX_ENABLE_STDOUT
coud be useful in their own right, however those are currently broken.
If we want to re-add such knobs in the future, we can do it like we've
done it for localization & friends so that we can officially support
that configuration.

Differential Revision: https://reviews.llvm.org/D108637

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[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

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[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.

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[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.

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[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.