ccanlint: fix missing file.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

tools/ccanlint/tests/info_compiles.c

+#include <tools/ccanlint/ccanlint.h>
+#include <tools/tools.h>
+#include <ccan/tal/grab_file/grab_file.h>
+#include <ccan/read_write_all/read_write_all.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 void check_info_compiles(struct manifest *m,
+				unsigned int *timeleft, struct score *score)
+{
+	char *info_c_file, *info, *output;
+	int fd;
+
+	/* We don't really fail if we're in safe mode: our dependencies
+	 * still run. */
+	if (safe_mode) {
+		score->pass = true;
+		score->score = 0;
+		return;
+	}
+
+	/* Copy it to a file with proper .c suffix. */
+	info = grab_file(score, m->info_file->fullname);
+	if (!info) {
+		score_file_error(score, m->info_file, 0,
+				 "could not be read: %s", strerror(errno));
+		return;
+	}
+
+	info_c_file = temp_file(info, ".c", "_info");
+	fd = open(info_c_file, O_WRONLY|O_CREAT|O_EXCL, 0600);
+	if (fd < 0 || !write_all(fd, info, tal_count(info)-1))
+		err(1, "Copying _info file");
+
+	if (close(fd) != 0)
+		err(1, "Closing _info file");
+
+	m->info_file->compiled[COMPILE_NORMAL] = temp_file(m, "", "info");
+	if (!compile_and_link(score, info_c_file, find_ccan_dir(m->dir), "",
+			      compiler, cflags, "",
+			      m->info_file->compiled[COMPILE_NORMAL],
+			      &output)) {
+		score_file_error(score, m->info_file, 0,
+				 "Errors compiling _info:\n%s", output);
+		return;
+	}
+
+	score->pass = true;
+	score->score = 1;
+}
+
+struct ccanlint info_compiles = {
+	.key = "info_compiles",
+	.name = "_info compiles",
+	.check = check_info_compiles,
+	.needs = "info_exists",
+	.compulsory = true
+};
+
+REGISTER_TEST(info_compiles);