/opt/IBM/openxlC/17.1.1/bin/ibm-clang -pthread   -Wall -Wextra -Werror=implicit-function-declaration dlfcn/dladdr.c -o dlfcn/dladdr -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lrt  -liconv -latomic
dlfcn/dladdr.c:18:2: error: unknown type name 'Dl_info_t'; did you mean 'siginfo_t'?
        Dl_info_t info;
        ^~~~~~~~~
        siginfo_t
/usr/include/sys/signal.h:322:3: note: 'siginfo_t' declared here
} siginfo_t;
  ^
dlfcn/dladdr.c:19:7: error: call to undeclared function 'dladdr'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
        if ( dladdr((void*) main, &info) < 0 )
             ^
2 errors generated.