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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 the earlier versions of GCC 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 > Reviewed-by: Sebastian Andrzej Siewior Signed-off-by: John Kacur