/opt/IBM/openxlC/17.1.1/bin/ibm-clang -pthread   -Wall -Wextra -Werror=implicit-function-declaration asprintf-failure-null-clobber-eoverflow.c -o asprintf-failure-null-clobber-eoverflow -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lrt  -liconv -latomic
asprintf-failure-null-clobber-eoverflow.c:87:12: error: call to undeclared function 'asprintf'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
        int ret = asprintf(&output, "123%*s%*s", INT_MAX, "x", INT_MAX, "x");
                  ^
1 error generated.