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7edfd6b774
If both C++ bindings and the test suite are allowed but catch2 is absent,
meson setup would fail the build with error(). Follow the same *_enabled
graceful handling pattern established for all other optional components:
compute cxx_tests_enabled based on whether catch2 is actually found,
emit a warning() instead of error() when it's missing, and gate the C++
tests subdir on the new flag.
Also: enter the catch2 discovery block based on tests_enabled (instead of
opt_tests.allowed()) so it only runs once the test-suite dependencies
(threads, libgpiosim) are confirmed present.
Add a "C++ tests" line to the Bindings summary section, visible only when
C++ bindings are enabled.
Closes: https://github.com/brgl/libgpiod/discussions/190
Fixes: 97bab4cc87 ("build: replace autotools with meson & ninja")
Link: https://patch.msgid.link/20260622-build-catch2-issue-v1-1-be95e28f310b@oss.qualcomm.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>