--- /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 bool expect_obj_file(struct manifest *m)
+{
+ /* If it has C files, we expect an object file built from them. */
+ return !list_empty(&m->c_files);
+}
+
+static char *build_subdir_objs(struct manifest *m)
+{
+ struct ccan_file *i;
+
+ list_for_each(&m->c_files, i, list) {
+ char *fullfile = talloc_asprintf(m, "%s/%s", m->dir, i->name);
+ char *output;
+
+ i->compiled = maybe_temp_file(m, "", false, fullfile);
+ if (!compile_object(m, fullfile, ccan_dir, "", i->compiled,
+ &output)) {
+ talloc_free(i->compiled);
+ i->compiled = NULL;
+ return talloc_asprintf(m,
+ "Dependency %s"
+ " did not build:\n%s",
+ m->basename, output);
+ }
+ }
+ return NULL;
+}
+
+char *build_submodule(struct manifest *m)
+{
+ char *errstr;
+ struct stat st;
+
+ if (m->compiled)
+ return NULL;
+
+ if (!expect_obj_file(m))
+ return NULL;
+
+ m->compiled = talloc_asprintf(m, "%s.o", m->dir);
+ if (stat(m->compiled, &st) == 0)
+ return NULL;
+
+ if (verbose >= 2)
+ printf(" Building dependency %s\n", m->dir);
+
+ errstr = build_subdir_objs(m);
+ if (errstr)
+ return errstr;
+
+ m->compiled = build_module(m, false, &errstr);
+ if (!m->compiled)
+ return errstr;
+ return NULL;
+}
+
+static void check_depends_built(struct manifest *m,
+ bool keep,
+ unsigned int *timeleft, struct score *score)
+{
+ struct manifest *i;
+
+ list_for_each(&m->deps, i, list) {
+ char *errstr = build_submodule(i);
+
+ if (errstr) {
+ score->error = talloc_asprintf(score,
+ "Dependency %s"
+ " did not build:\n%s",
+ i->basename, errstr);
+ return;
+ }
+ }
+
+ score->pass = true;
+ score->score = score->total;
+}
+
+struct ccanlint depends_build = {
+ .key = "depends_build",
+ .name = "Module's CCAN dependencies can be found or built",
+ .check = check_depends_built,
+ .can_run = can_build,
+ .needs = "depends_exist"
+};
+
+REGISTER_TEST(depends_build);