/opt/IBM/openxlC/17.1.1/bin/ibm-clang -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations signal/struct-timespec.c -o signal/struct-timespec -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -latomic
signal/struct-timespec.c:2:17: error: tentative definition has type 'struct timespec' that is never completed
struct timespec foo;
                ^
/usr/include/sys/signal.h:1172:8: note: forward declaration of 'struct timespec'
struct timespec;
       ^
1 error generated.