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Makefile: Generate test_prep targets for CMAKE_TEST_BUILD_DEPENDS

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Extend the test_prep/<test> and test_prep/all build targets, generated
from add_test(BUILD_DEPENDS) when CMAKE_TEST_BUILD_DEPENDS is enabled, to
the Makefile generators.  Previously only the Ninja and FASTBuild
generators provided them.

Resolve each test's dependencies in a shared layer so all command-line
generators consume one result.  cmTestGenerator now filters target
dependencies to build-system targets and records, for each file
dependency, the single target that produces it as a primary
custom-command output (cmGlobalGenerator::FindOutputOwningTarget).  The
Makefile generators emit phony rules in CMakeFiles/Makefile2 depending on
<target>.dir/all, with top-level forwarding rules.  Sharing the
resolution also stops Ninja and FASTBuild from emitting a dead test_prep
edge for a non-buildable (e.g. INTERFACE) BUILD_DEPENDS target.

On the Makefile generators a file dependency that no single target
produces, and a test whose name contains ':', cannot be expressed as a
recursive-make rule and are reported with a warning and skipped.

Fixes: #27879
This commit is contained in:
Daksh Mamodiya
2026-06-24 16:38:16 +02:00
parent 23c5b40924
commit 503bdb9777
21 changed files with 496 additions and 32 deletions
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14
Help/command/add_test.rst
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@@ -82,7 +82,12 @@ directory the test is created in.
.. versionchanged:: 4.5
:generator:`FASTBuild` gained support for ``test_prep/<name>`` targets.
:generator:`FASTBuild` and the :ref:`Makefile Generators` gained support
for ``test_prep/<name>`` targets. With the Makefile generators a
``BUILD_DEPENDS`` file is built by building the target whose build
produces it; a file that is not the unique output of a single target is
reported with a warning, and a test whose name contains a ``:`` character
is excluded.
The command may be specified using
:manual:`generator expressions <cmake-generator-expressions(7)>`.
@@ -101,9 +106,10 @@ directory the test is created in.
Specify a list of targets or files that must be built before the test can
run. Each dependency is added to the ``test_prep/<name>`` build target
described above when :variable:`CMAKE_TEST_BUILD_DEPENDS` is enabled with
the :ref:`Ninja Generators` or :generator:`FASTBuild`. The test name must be
a valid target name in order to list build dependencies with this keyword.
described above when :variable:`CMAKE_TEST_BUILD_DEPENDS` is enabled with the
:ref:`Ninja Generators`, :generator:`FASTBuild`, or :ref:`Makefile
Generators`. The test name must be a valid target name in order to list
build dependencies with this keyword.
``COMMAND_EXPAND_LISTS``
.. versionadded:: 3.16