Allow --with-wal-segsize=n up to n=1024MB

Other part of Beena Emerson's patch to allow testing

configure

@@ -3725,7 +3725,11 @@ case ${wal_segsize} in
  16) ;;
  32) ;;
  64) ;;
-  *) as_fn_error $? "Invalid WAL segment size. Allowed values are 1,2,4,8,16,32,64." "$LINENO" 5
+ 128) ;;
+ 256) ;;
+ 512) ;;
+ 1024) ;;
+  *) as_fn_error $? "Invalid WAL segment size. Allowed values are 1,2,4,8,16,32,64,128,256,512,1024." "$LINENO" 5
 esac
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: ${wal_segsize}MB" >&5
 $as_echo "${wal_segsize}MB" >&6; }

configure.in

@@ -358,7 +358,11 @@ case ${wal_segsize} in
  16) ;;
  32) ;;
  64) ;;
-  *) AC_MSG_ERROR([Invalid WAL segment size. Allowed values are 1,2,4,8,16,32,64.])
+ 128) ;;
+ 256) ;;
+ 512) ;;
+ 1024) ;;
+  *) AC_MSG_ERROR([Invalid WAL segment size. Allowed values are 1,2,4,8,16,32,64,128,256,512,1024.])
 esac
 AC_MSG_RESULT([${wal_segsize}MB])
 

doc/src/sgml/installation.sgml

@@ -1049,7 +1049,7 @@ su - postgres
          the size of each individual file in the WAL log.  It may be useful
          to adjust this size to control the granularity of WAL log shipping.
          The default size is 16 megabytes.
-         The value must be a power of 2 between 1 and 64 (megabytes).
+         The value must be a power of 2 between 1 and 1024 (megabytes).
          Note that changing this value requires an initdb.
         </para>
        </listitem>