Deprecation warnings when compiling with -DGLIB_VERSION_MAX_ALLOWED=GLIB_VERSION_2_28 -DGLIB_VERSION_MIN_REQUIRED=GLIB_VERSION_2_28

With a trivial file that just includes glib.h:

#include <glib.h>

Compiled with:

gcc -c test.c -I /tmp/glib/include/glib-2.0/ -I /tmp/glib/lib/x86_64-linux-gnu/glib-2.0/include -DGLIB_VERSION_MAX_ALLOWED=GLIB_VERSION_2_28 -DGLIB_VERSION_MIN_REQUIRED=GLIB_VERSION_2_28 -fmax-errors=1 -Werror

gives:

In file included from /tmp/glib/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /tmp/glib/include/glib-2.0/glib.h:32,
                 from test.c:1:
/tmp/glib/include/glib-2.0/glib/gthread.h: In function ‘g_rec_mutex_locker_new’:
/tmp/glib/include/glib-2.0/glib/gthread.h:396:3: error: ‘g_rec_mutex_lock’ is deprecated: Not available before 2.32 [-Werror=deprecated-declarations]
  396 |   g_rec_mutex_lock (rec_mutex);
      |   ^~~~~~~~~~~~~~~~
/tmp/glib/include/glib-2.0/glib/gthread.h:196:17: note: declared here
  196 | void            g_rec_mutex_lock                (GRecMutex      *rec_mutex);
      |                 ^~~~~~~~~~~~~~~~
compilation terminated due to -fmax-errors=1.

This is with current master, commit de8708cd.