+#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>
+
+static const char *can_build(struct manifest *m)
+{
+ if (safe_mode)
+ return "Safe mode enabled";
+ return NULL;
+}
+
+/* FIXME: recursive ccanlint if they ask for it. */
+static bool expect_obj_file(const char *dir)
+{
+ char *olddir;
+ struct manifest *dep_man;
+ bool has_c_files;
+
+ olddir = talloc_getcwd(dir);
+ if (!olddir)
+ err(1, "Getting current directory");
+
+ /* We will fail below if this doesn't exist. */
+ if (chdir(dir) != 0)
+ return false;
+
+ dep_man = get_manifest(dir);
+ if (chdir(olddir) != 0)
+ err(1, "Returning to original directory '%s'", olddir);
+ talloc_free(olddir);
+
+ /* If it has C files, we expect an object file built from them. */
+ has_c_files = !list_empty(&dep_man->c_files);
+ talloc_free(dep_man);
+ return has_c_files;
+}
+
+static void *check_depends_built(struct manifest *m)
+{
+ struct ccan_file *i;
+ char *report = NULL;
+
+ list_for_each(&m->dep_dirs, i, list) {
+ char *objfile;
+ struct stat st;
+
+ if (!expect_obj_file(i->name))
+ continue;
+
+ objfile = talloc_asprintf(m, "%s.o", i->name);
+ if (stat(objfile, &st) != 0) {
+ report = talloc_asprintf_append(report,
+ "object file %s\n",
+ objfile);
+ } else {
+ struct ccan_file *f = new_ccan_file(m, objfile);
+ list_add_tail(&m->dep_objs, &f->list);
+ }
+
+ }
+ return talloc_steal(m, report);
+}
+
+static const char *describe_depends_built(struct manifest *m,
+ void *check_result)
+{
+ return talloc_asprintf(check_result,
+ "The following dependencies are not built:\n"
+ "%s", (char *)check_result);
+}
+
+struct ccanlint depends_built = {
+ .name = "CCAN dependencies are built",
+ .total_score = 1,
+ .check = check_depends_built,
+ .describe = describe_depends_built,
+ .can_run = can_build,
+};
+
+REGISTER_TEST(depends_built, &depends_exist, NULL);