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Those are keywords in C23, which became GCC's default in GCC 15 (-std=gnu23), so the file compiles there without stdbool.h. With GCC 14 and earlier the default is gnu17, where they are provided by , and the build fails without it. Fixes: 98fcd661ac59 (cyclictest: Acquire a lock before invoking pthread_cond_signal()) Closes: https://lore.kernel.org/linux-rt-users/4ce24139-5f7e-4180-a290-bcc15fb4f559@amd.com/ Signed-off-by: Suneeth D Signed-off-by: John Kacur Reviewed-by: Sebastian Andrzej Siewior --- Please ignore the previously sent v2. Sorry for the noise. Changes since v2 ---> v3: * Add Signed-off tag by John Kacur Changes since v1 ---> v2: * Modify commit message to include Tomas Glozar's note on default changes happened since GCC 15. based on: fd45df830803dd7f26d2ca8bdcf05fd7e0d62ae8 (rt-tests/main) src/cyclictest/cyclictest.c | 1 + 1 file changed, 1 insertion(+) diff --git a/src/cyclictest/cyclictest.c b/src/cyclictest/cyclictest.c index 99194378f946..58b56bcede0f 100644 --- a/src/cyclictest/cyclictest.c +++ b/src/cyclictest/cyclictest.c @@ -15,6 +15,7 @@ #include #include #include +#include #include #include #include -- 2.43.0