mbed-ce@master + fixes + gcc 11 support (#135) ...

* Fix rtos::Mutex stub, add trylock() method

* LowPowerTicker - Add ::attach(...) method + call callback

* mbed_power_management - rename sleep --> mbed_sleep to avoid conflicts

Fixes conflicts w/ unistd.h and boost::ut

* GCC 11/C++ 20 - Remove deprecated type_traits

* GCC 11/C++ 20 - Remove redundant templating of methods

* Warning - pragma ignore invalid-noreturn for unit tests

* Fix astyle errors

* Fix missing mbed_sleep() calls

Add SingletonPtr.cpp to unittests source

Fix some build errors

Clean up top-level build file and build options, fix build issues on MinGW

Allow unit tests to be compiled with -fno-exception

Added unit test for floating point formatting ...

And added a bonus test for string padding

Merge pull request #15067 from ARMmbed/fix_flash_overflow_callback_big_test ...

Greentea: Fix flash overflown issue in callback_big test

Greentea: Fix flash overflown issue in callback_big test ...

The "Callback_big" greentea test has six test cases that require
a minimum above 36kb ROM to build all test cases. LPC1114 target
has only 32KB ROM memory, so the limit 6th test case to include
or exclude based on the target minimum ROM size.

Note:
In LPC1114 target, callback_big test has ROM overflow build issue
for both Mbed CLI1 and CLI2.

CMake: Fix platform wait_ns greentea test Cmake ...

Mbed CLI 2 generates TARGET_ARM_FM macro as a string in mbed_config.cmake
under the MBED_TARGET_DEFINITIONS list. Fix the "if defined" check for
TARGET_ARM_FM by searching for the TARGET_ARM_FM string in the
MBED_TARGET_DEFINITIONS list. This allows us to skip or include the test from CMake.

Update platform CMake to include greentea test dir

CMake: greentea: Add skip reason to platform test

CMake: Refactor platform greentea test CMake ...

Initially, every library greentea test has its project() creation in
their CMake. As running greentea using CTest move all greentea test
suite under one global project mbed-os and MBED_CONFIG_PATH set at
the root mbed os CMake under the condition BUILD_GREENTEA_TESTS
check so refactored platform greentea CMake accordingly.

Unit tests: Remove redundant CMake target mbed-headers-base ...

Individual libraries' `target_h` stub headers have now all been moved
from `mbed-headers-base` to `mbed-headers-<library>`.

Note: Even though headers previously in `target_h` are technically
stubs/fakes too, they are used by not only unit tests but also regular
libraries when compiled for unit tests, because no target-specific HAL
implementation exists in this case. In order for regular library
sources to pick up `target_h` headers, those headers must

* have the same names as regular headers
* appear first in include paths

This is why those headers are part of `mbed-headers-<library>` and not
`mbed-stubs-<library>`. Before this refactoring, `mbed-headers-base`
was the first in unit tests' include paths.

Unit tests: Move randLIB.h ...

The stub header randLIB.h overrides the header of the same name in
platform/randlib/ which is an external repository vendored into
the mbed-os codebase. As the repository is synchronized regularly,
it is better not to put overrides there, so we put the randLIB.h
stub into the regular platform doubles directory.

Unit tests: Move platform target_h stubs ...

Stubs previously in UNITTESTS/target_h/ have the same names as
regular Mbed OS headers, intending to override the latter directly.
We move platform target_h stubs into
platform/tests/UNITTESTS/doubles/platform/.

Note: nvic_wrapper.h is normally implemented and used by Mbed targets
as needed. But as unit tests do not have a real target, we treat it
as a stub for the platform.

Unit tests: Move cmsis target_h stubs ...

This creates a new mbed-headers-cmsis which is always and only used
by mbed-headers-platform, so we add the former to the laters' linked
targets.

CMake: unittests: Show all tests in CTest report ...

Previously a test executable was recognised as a single test by CTest.
However, test executables usually contain multiple test cases, the
results of the test cases should be individually reported. With our
previous setup we could miss test case failures that didn't cause the
executable to return an error code.

This commit uses gtest_discover_test to discover all test cases in a
test executable. This enables CTest to match test passes and failures
from the googletest binary output.

test: Make MBED_ASSERT failures fail ...

Make MBED_ASSERT failures fail the unit test case. Without this, we
might not notice the assertion failure as it wouldn't be bubbled up to
googletest.

test: CircularBuffer: Don't push zero elements ...

The CircularBuffer doesn't allow pushing zero elements; you must push at
least one. Update the CircularBuffer unit test to avoid invalid use of
the CircularBuffer.

CMake: unit-tests: Remove --coverage option from mbed-stubs-platform ...

We set the --coverage flag globally in UNITTESTS/CMakeLists.txt. We
shouldn't need to also set it on mbed-stubs-platform, so remove it.

CMake: unit-tests: Split platform headers out of mbed-stubs-headers ...

We have a central collection of "stub headers", which makes reasoning
about dependencies rather difficult, as it forces every stub library to
depend on all available stub headers. The standard approach would be for
each stub library to expose its public headers, and its dependents to
explicitly specify a dependency on the stub library containing the
headers it needs. This is a more modular design than creating a
header-only monolith library. Move the platform stub headers from this
central library into the mbed-stubs-platform library to increase
modularity.

mbed-stubs-connectivity now depends on the mbed-stubs-platform because
it requires some headers which were moved to mbed-stubs-platform.

CMake: unit-tests: Make platform stub only depend on headers it uses ...

Previously the platform stub library depended on `mbed-headers`, which
is a collection of all available headers in mbed-os. To make it easier
to separate the library, only depend on the headers we're actually using.

CMake: unit-tests: Move mbed-headers-platform to platform directory ...

Move the header-only mbed-headers-platform library the unit test stubs
depend on into the platform component directory. This makes the platform
stubs more self contained and improves composition of the library.

CMake: Move platform stubs to the mbed-os/platform directory ...

Move the platform stub library into the platform component directory.
This change is so we can avoid duplicating the mbed-os source tree in a
central UNITTESTS folder.

CMake: unit-tests: CircularBuffer: Remove trailing whitespace

Merge pull request #14718 from Meano/develop ...

Feature: Make changes for Cortex-A5 support

CMake: Require TEST_SOURCES in greentea CMake file ...

Assumption that greentea test file is always named main.cpp is
incorrect. Updated mbed_greentea_add_test() macro to make TEST_SOURCES
parameter compulsory, which is used to specify greentea test
file(s). This allows tests to use C, or have a different name.
Therefore also updated all pre-existing greentea test CMake files to
explicity add main.cpp to TEST_SOURCES.

Make changes for Cortex-A5 support

CMake: unit-tests: Remove trailing whitespace

CMake: Remove all unittest.cmake script from test suite ...

- Remove redundant cmake script as already added the CMake configuration file
- Remove redundant empty_baseline as it is no longer needed with the help of CMake configuration file