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tests: Preserve empty arguments in test command lines

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This will now preserve empty values in the TEST_LAUNCHER and
CROSSCOMPILING_EMULATOR target properties for tests added by:

- The add_test() command.
- The ExternalData_Add_Test() command from the ExternalData module.
- The gtest_add_tests() or gtest_discover_tests() commands from the
  GoogleTest module.

For the gtest_add_tests() and gtest_discover_tests() commands,
empty elements in the values passed after the EXTRA_ARGS keyword
are also now preserved.

Policy CMP0178 is added to provide backward compatibility with the
old behavior where empty values were silently discarded from the
above cases.

Fixes: #26337
This commit is contained in:
Craig Scott
2024-09-30 21:13:13 +10:00
parent 9f1703530b
commit fc7aa3cd69
27 changed files with 512 additions and 80 deletions
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Help/policy/CMP0178.rst
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CMP0178
-------
.. versionadded:: 3.31
Test command lines preserve empty arguments.
Empty values in the :prop_tgt:`TEST_LAUNCHER` and
:prop_tgt:`CROSSCOMPILING_EMULATOR` target properties are now preserved
for tests added by the following:
* The :command:`add_test` command.
* The :command:`ExternalData_Add_Test` command from the :module:`ExternalData`
module.
* The :command:`gtest_add_tests` or :command:`gtest_discover_tests` commands
from the :module:`GoogleTest` module.
For the :command:`gtest_add_tests` and :command:`gtest_discover_tests`
commands, empty elements in the values passed after the ``EXTRA_ARGS``
keyword are also now preserved.
The ``OLD`` behavior of this policy silently discards empty list items
from the :prop_tgt:`TEST_LAUNCHER` and :prop_tgt:`CROSSCOMPILING_EMULATOR`
target properties in the above-mentioned cases. It also silently discards
empty items from the values given after ``EXTRA_ARGS`` for the
:command:`gtest_add_tests` and :command:`gtest_discover_tests` commands.
The ``NEW`` behavior of this policy preserves empty list items in the
:prop_tgt:`TEST_LAUNCHER` and :prop_tgt:`CROSSCOMPILING_EMULATOR` target
properties, and in values given after ``EXTRA_ARGS`` for
:command:`gtest_add_tests` and :command:`gtest_discover_tests`.
.. |INTRODUCED_IN_CMAKE_VERSION| replace:: 3.31
.. |WARNS_OR_DOES_NOT_WARN| replace:: warns
.. include:: STANDARD_ADVICE.txt
.. include:: DEPRECATED.txt