Loadable Bash Builtin

Question

I'm writing a strcmp bash builtin. It compiles fine, but when I try to enable it, I get:

$ enable -f ./strcmp strcmp
bash: enable: cannot open shared object ./strcmp: ./strcmp: only ET_DYN and ET_EXEC can be loaded

The big parts of my builtin:

strcmp_builtin (list)
WORD_LIST *list;

char *strcmp_doc[] = {
    (char *)NULL
};

struct builtin strcmp_struct = {
    "strcmp", /* builtin name */
    strcmp_builtin, /* function implementing the builtin */
    BUILTIN_ENABLED, /* initial flags for builtin */
    strcmp_doc, /* array of long documentation strings. */
    "strcmp 'string 1' 'string 2'", /* usage synopsis; becomes short_doc */
    0 /* reserved for internal use */
};

The compile line (from the expanded make file):

~/bash-4.2/examples/loadables $ gcc -fPIC -DHAVE_CONFIG_H -DSHELL \
-g -O2 -I. -I.. -I../.. -I../../lib -I../../builtins -I../../include \
-I~/bash-4.2 -I~/bash-4.2/lib -I~/bash-4.2/builtins  -c \
-o strcmp strcmp.c

I have googled ET_DYN and ET_EXEC, and only found links to questions like this.

Answer 1

Did you notice the -c flag? That's keeping it from linking. Replace that with -shared, as @shr mentioned