--- /dev/null
+#include <tools/ccanlint/ccanlint.h>
+#include <tools/tools.h>
+#include <ccan/talloc/talloc.h>
+#include <ccan/str/str.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <limits.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <err.h>
+#include <string.h>
+#include <ctype.h>
+#include "build.h"
+
+static const char *can_build(struct manifest *m)
+{
+ if (safe_mode)
+ return "Safe mode enabled";
+ return NULL;
+}
+
+static char *obj_list(const struct manifest *m)
+{
+ char *list = talloc_strdup(m, "");
+ struct ccan_file *i;
+
+ /* Objects from all the C files. */
+ list_for_each(&m->c_files, i, list)
+ list = talloc_asprintf_append(list, "%s ", i->compiled);
+
+ return list;
+}
+
+char *build_module(struct manifest *m, bool keep, char **errstr)
+{
+ char *name = link_objects(m, m->basename, false, obj_list(m), errstr);
+ if (name) {
+ if (keep) {
+ char *realname = talloc_asprintf(m, "%s.o", m->dir);
+ /* We leave this object file around, all built. */
+ if (!move_file(name, realname))
+ err(1, "Renaming %s to %s", name, realname);
+ name = realname;
+ }
+ }
+ return name;
+}
+
+static void do_build(struct manifest *m,
+ bool keep,
+ unsigned int *timeleft,
+ struct score *score)
+{
+ char *errstr;
+
+ if (list_empty(&m->c_files)) {
+ /* No files? No score, but we "pass". */
+ score->total = 0;
+ score->pass = true;
+ return;
+ }
+
+ m->compiled = build_module(m, keep, &errstr);
+ if (!m->compiled) {
+ score_file_error(score, NULL, 0, errstr);
+ return;
+ }
+
+ score->pass = true;
+ score->score = score->total;
+}
+
+struct ccanlint module_builds = {
+ .key = "module_builds",
+ .name = "Module can be built from object files",
+ .check = do_build,
+ .can_run = can_build,
+ .needs = "objects_build"
+};
+
+REGISTER_TEST(module_builds);