tests: Test that we can include all headers with an old MAX_VERSION

In principle we could script this so that each max-version.c is compiled
26 times, once per possible MAX_VERSION, but I haven't implemented
that here: just pinning to the oldest possible version is sufficient to
reproduce #2796.

These aren't included in the installed-tests, since they don't really
do anything at runtime (the important thing is that they compile
without warnings).

Reproduces: #2796
Signed-off-by: Simon McVittie <smcv@collabora.com>

1 files changed, 50 insertions, 0 deletions

diff --git a/glib/tests/max-version.c b/glib/tests/max-version.c
new file mode 100644
index 000000000..3b27adb2f
--- /dev/null
+++ b/glib/tests/max-version.c
@@ -0,0 +1,50 @@
+/*
+ * Copyright 2022 Collabora Ltd.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General
+ * Public License along with this library; if not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GLIB_VERSION_MAX_ALLOWED
+/* This is the oldest version macro available */
+#define GLIB_VERSION_MIN_REQUIRED GLIB_VERSION_2_26
+#define GLIB_VERSION_MAX_ALLOWED GLIB_VERSION_2_26
+#endif
+
+/* All the headers that can validly be included in third-party code */
+#include <glib.h>
+#include <glib/gi18n.h>
+#include <glib/gprintf.h>
+#include <glib/gstdio.h>
+
+#ifdef G_OS_UNIX
+#include <glib-unix.h>
+#endif
+
+static void
+nothing (void)
+{
+  /* This doesn't really do anything: the real "test" is at compile time. */
+}
+
+int
+main (int   argc,
+      char *argv[])
+{
+  g_test_init (&argc, &argv, NULL);
+
+  g_test_add_func ("/max-version/tested-at-compile-time", nothing);
+  return g_test_run ();
+}