/* Compile a single C file to an object file. Returns errmsg if fails. */
char *compile_object(const void *ctx, const char *cfile, const char *ccandir,
const char *extra_cflags,
/* Compile a single C file to an object file. Returns errmsg if fails. */
char *compile_object(const void *ctx, const char *cfile, const char *ccandir,
const char *extra_cflags,