+#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;
+}
+
+static int cleanup_testfile(char *testfile)
+{
+ unlink(testfile);
+ return 0;
+}
+
+static char *obj_list(const struct manifest *m)
+{
+ char *list = talloc_strdup(m, "");
+ struct ccan_file *i;
+
+ /* Other CCAN deps. */
+ list_for_each(&m->dep_objs, i, list)
+ list = talloc_asprintf_append(list, "%s ", i->name);
+
+ return list;
+}
+
+static char *lib_list(const struct manifest *m)
+{
+ unsigned int i, num;
+ char **libs = get_libs(m, ".", ".", &num);
+ char *ret = talloc_strdup(m, "");
+
+ for (i = 0; i < num; i++)
+ ret = talloc_asprintf_append(ret, "-l %s ", libs[i]);
+ return ret;
+}
+
+static void *check_use_build(struct manifest *m)
+{
+ char *contents;
+ char *tmpfile, *outfile;
+ int fd;
+
+ tmpfile = talloc_strdup(m, tempnam("/tmp", "ccanlint"));
+ talloc_set_destructor(tmpfile, cleanup_testfile);
+ outfile = talloc_strdup(m, tempnam("/tmp", "ccanlint"));
+ talloc_set_destructor(outfile, cleanup_testfile);
+
+ fd = open(tmpfile, O_WRONLY | O_CREAT | O_EXCL, 0600);
+ if (fd < 0)
+ return talloc_asprintf(m, "Creating temporary file: %s",
+ strerror(errno));
+
+ contents = talloc_asprintf(tmpfile,
+ "#include <ccan/%s/%s.h>\n"
+ "int main(void)\n"
+ "{\n"
+ " return 0;\n"
+ "}\n",
+ m->basename, m->basename);
+ if (write(fd, contents, strlen(contents)) != strlen(contents)) {
+ close(fd);
+ return "Failure writing to temporary file";
+ }
+ close(fd);
+
+ return run_command(m, "cc " CFLAGS " -o %s -x c %s -x none %s %s",
+ outfile, tmpfile, obj_list(m), lib_list(m));
+}
+
+static const char *describe_use_build(struct manifest *m, void *check_result)
+{
+ return talloc_asprintf(check_result,
+ "Linking against module:\n"
+ "%s", (char *)check_result);
+}
+
+struct ccanlint check_build = {
+ .name = "Module can be used",
+ .total_score = 1,
+ .check = check_use_build,
+ .describe = describe_use_build,
+ .can_run = can_build,
+};
+
+REGISTER_TEST(check_build, &build, NULL);