Fix build on glibc 2.36

configure

@@ -5137,6 +5137,20 @@ if compile_prog "" "" ; then
     have_fsxattr=yes
 fi
 
+##########################################
+# check if sys/mount.h conflicts with linux/fs.h
+
+have_sysmount_fs=no
+cat > $TMPC << EOF
+#include <sys/mount.h>
+int main(void) {
+  return FSCONFIG_SET_FLAG;
+}
+EOF
+if compile_prog "" "" ; then
+    have_sysmount_fs=yes
+fi
+
 ##########################################
 # check if rtnetlink.h exists and is useful
 have_rtnetlink=no
@@ -6501,6 +6515,10 @@ if test "$rdma" = "yes" ; then
   echo "RDMA_LIBS=$rdma_libs" >> $config_host_mak
 fi
 
+if test "$have_sysmount_fs" = "yes" ; then
+  echo "CONFIG_SYS_MOUNT_FS=y" >> $config_host_mak
+fi
+
 if test "$have_rtnetlink" = "yes" ; then
   echo "CONFIG_RTNETLINK=y" >> $config_host_mak
 fi

linux-user/syscall.c

@@ -98,7 +98,24 @@
 #include <linux/soundcard.h>
 #include <linux/kd.h>
 #include <linux/mtio.h>
+#ifdef CONFIG_SYS_MOUNT_FS
+/*
+ * glibc >= 2.36 linux/mount.h conflicts with sys/mount.h,
+ * which in turn prevents use of linux/fs.h. So we have to
+ * define the constants ourselves for now.
+ */
+#define FS_IOC_GETFLAGS                _IOR('f', 1, long)
+#define FS_IOC_SETFLAGS                _IOW('f', 2, long)
+#define FS_IOC_GETVERSION              _IOR('v', 1, long)
+#define FS_IOC_SETVERSION              _IOW('v', 2, long)
+#define FS_IOC_FIEMAP                  _IOWR('f', 11, struct fiemap)
+#define FS_IOC32_GETFLAGS              _IOR('f', 1, int)
+#define FS_IOC32_SETFLAGS              _IOW('f', 2, int)
+#define FS_IOC32_GETVERSION            _IOR('v', 1, int)
+#define FS_IOC32_SETVERSION            _IOW('v', 2, int)
+#else
 #include <linux/fs.h>
+#endif
 #if defined(CONFIG_FIEMAP)
 #include <linux/fiemap.h>
 #endif