Downgrade bdb to 5.3.28

bdb 6.X was released under the AGPL, which is incompatible with MIT-licensed
software (the result must be licensed under AGPL). bdb 5.X uses the same license
as bdb 4.8, and thus retains the same compatibility as in upstream Bitcoin.

Thanks to Luke-Jr for raising this issue.

build-aux/m4/bitcoin_find_bdb48.m4

@@ -1,11 +1,11 @@
-AC_DEFUN([BITCOIN_FIND_BDB62],[
+AC_DEFUN([BITCOIN_FIND_BDB53],[
   AC_MSG_CHECKING([for Berkeley DB C++ headers])
   BDB_CPPFLAGS=
   BDB_LIBS=
   bdbpath=X
-  bdb62path=X
+  bdb53path=X
   bdbdirlist=
-  for _vn in 6.2 62 6 ''; do
+  for _vn in 5.3 53 5 ''; do
     for _pfx in b lib ''; do
       bdbdirlist="$bdbdirlist ${_pfx}db${_vn}"
     done
@@ -15,8 +15,8 @@ AC_DEFUN([BITCOIN_FIND_BDB62],[
     AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
       #include <${searchpath}db_cxx.h>
     ]],[[
-      #if !((DB_VERSION_MAJOR == 6 && DB_VERSION_MINOR >= 2) || DB_VERSION_MAJOR > 6)
-        #error "failed to find bdb 6.2+"
+      #if !((DB_VERSION_MAJOR == 5 && DB_VERSION_MINOR >= 3) || DB_VERSION_MAJOR > 5)
+        #error "failed to find bdb 5.3+"
       #endif
     ]])],[
       if test "x$bdbpath" = "xX"; then
@@ -28,32 +28,32 @@ AC_DEFUN([BITCOIN_FIND_BDB62],[
     AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
       #include <${searchpath}db_cxx.h>
     ]],[[
-      #if !(DB_VERSION_MAJOR == 6 && DB_VERSION_MINOR == 2)
-        #error "failed to find bdb 6.2"
+      #if !(DB_VERSION_MAJOR == 5 && DB_VERSION_MINOR == 3)
+        #error "failed to find bdb 5.3"
       #endif
     ]])],[
-      bdb62path="${searchpath}"
+      bdb53path="${searchpath}"
       break
     ],[])
   done
   if test "x$bdbpath" = "xX"; then
     AC_MSG_RESULT([no])
     AC_MSG_ERROR([libdb_cxx headers missing, Bitcoin Core requires this library for wallet functionality (--disable-wallet to disable wallet functionality)])
-  elif test "x$bdb62path" = "xX"; then
+  elif test "x$bdb53path" = "xX"; then
     BITCOIN_SUBDIR_TO_INCLUDE(BDB_CPPFLAGS,[${bdbpath}],db_cxx)
-    AC_ARG_WITH([incompatible-bdb],[AS_HELP_STRING([--with-incompatible-bdb], [allow using a bdb version other than 6.2])],[
-      AC_MSG_WARN([Found Berkeley DB other than 6.2; wallets opened by this build will not be portable!])
+    AC_ARG_WITH([incompatible-bdb],[AS_HELP_STRING([--with-incompatible-bdb], [allow using a bdb version other than 5.3])],[
+      AC_MSG_WARN([Found Berkeley DB other than 5.3; wallets opened by this build will not be portable!])
     ],[
-      AC_MSG_ERROR([Found Berkeley DB other than 6.2, required for portable wallets (--with-incompatible-bdb to ignore or --disable-wallet to disable wallet functionality)])
+      AC_MSG_ERROR([Found Berkeley DB other than 5.3, required for portable wallets (--with-incompatible-bdb to ignore or --disable-wallet to disable wallet functionality)])
     ])
   else
-    BITCOIN_SUBDIR_TO_INCLUDE(BDB_CPPFLAGS,[${bdb62path}],db_cxx)
-    bdbpath="${bdb62path}"
+    BITCOIN_SUBDIR_TO_INCLUDE(BDB_CPPFLAGS,[${bdb53path}],db_cxx)
+    bdbpath="${bdb53path}"
   fi
   AC_SUBST(BDB_CPPFLAGS)
   
   # TODO: Ideally this could find the library version and make sure it matches the headers being used
-  for searchlib in db_cxx-6.2 db_cxx; do
+  for searchlib in db_cxx-5.3 db_cxx; do
     AC_CHECK_LIB([$searchlib],[main],[
       BDB_LIBS="-l${searchlib}"
       break

configure.ac

@@ -263,9 +263,9 @@ case $host in
          dnl add default macports paths
          CPPFLAGS="$CPPFLAGS -isystem /opt/local/include"
          LIBS="$LIBS -L/opt/local/lib"
-         if test -d /opt/local/include/db62; then
-           CPPFLAGS="$CPPFLAGS -I/opt/local/include/db62"
-           LIBS="$LIBS -L/opt/local/lib/db62"
+         if test -d /opt/local/include/db53; then
+           CPPFLAGS="$CPPFLAGS -I/opt/local/include/db53"
+           LIBS="$LIBS -L/opt/local/lib/db53"
          fi
        fi
 
@@ -512,7 +512,7 @@ AC_SUBST(LIBMEMENV)
 
 if test x$enable_wallet != xno; then
     dnl Check for libdb_cxx only if wallet enabled
-    BITCOIN_FIND_BDB62
+    BITCOIN_FIND_BDB53
 fi
 
 dnl Check for libminiupnpc (optional)

depends/packages/bdb.mk

@@ -1,8 +1,8 @@
 package=bdb
-$(package)_version=6.2.23
+$(package)_version=5.3.28
 $(package)_download_path=http://download.oracle.com/berkeley-db
 $(package)_file_name=db-$($(package)_version).tar.gz
-$(package)_sha256_hash=47612c8991aa9ac2f6be721267c8d3cdccf5ac83105df8e50809daea24e95dc7
+$(package)_sha256_hash=e0a992d740709892e81f9d93f06daf305cf73fb81b545afe72478043172c3628
 $(package)_build_subdir=build_unix
 
 define $(package)_set_vars
@@ -16,7 +16,7 @@ define $(package)_config_cmds
 endef
 
 define $(package)_build_cmds
-  $(MAKE) libdb_cxx-6.2.a libdb-6.2.a
+  $(MAKE) libdb_cxx-5.3.a libdb-5.3.a
 endef
 
 define $(package)_stage_cmds