berkdb in configure.ac

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The berkdb macros in cmulocal/berkdb.m4 tries to find the installed
berkeley include files and libraries but they are just too painful and
error prone.  I had reports of imapd crashes because of include/lib
mismatches.

In a properly installed system, we should be building by
including <db.h> and by linking with -ldb and not go through all the
hoops in berkdb.m4.  The following patch wrt cyrus-imapd-2.5.4 works for
me.

-- 
Eray Aslan <eras@xxxxxxxxxx>


--- configure.ac	2015-07-06 01:22:19.000000000 +0000
+++ configure.ac	2015-07-22 11:18:33.000000000 +0000
@@ -236,50 +236,29 @@
 dnl Berkeley DB Detection
 
 AC_ARG_WITH(bdb,
-	[AS_HELP_STRING([--with-bdb=DIR], [use Berkeley DB (in DIR) [yes]])],
-	with_bdb=$withval, with_bdb="yes")
-
-dnl support old-style
-AC_ARG_WITH(dbdir,, with_bdb=$withval)
+	[AS_HELP_STRING([--with-bdb], [use Berkeley DB [yes]])],
+	[],
+	[with_bdb="yes"])
 
+# On a properly installed system, we build
+# by including <db.h> and by linking with -ldb
 case "$with_bdb" in
-  no)
-	use_berkeley="no"
-	;;
-  yes)
-	use_berkeley="yes"
-	with_bdb_lib=none
-	with_bdb_inc=none
-	;;
-  *)
-	use_berkeley="yes"
-	with_bdb_lib="$with_bdb/lib"
-	with_bdb_inc="$with_bdb/include"
+  no)	;;
+  *)	AC_CHECK_FILE([/usr/include/db.h],
+  	[],
+	  AC_CHECK_FILE([/usr/include/db/db.h]),
+	  [BDB_INC="-I/usr/include/db"],
+          AC_MSG_ERROR([No <db.h> include file is found.  Install the
+	  appropriate db*-devel package first.]))
+	BDB_LIB="-ldb"
+	AC_SUBST(BDB_INC)
+	AC_SUBST(BDB_LIB)
+	LIBS="${LIBS} ${BDB_LIB}"
+	CPPFLAGS="${CPPFLAGS} ${BDB_INC}"
+	AC_DEFINE(HAVE_BDB,[],[Build in Berkeley DB support?])
 	;;
 esac
-
-if test "$use_berkeley" != "no"; then
-  CYRUS_BERKELEY_DB_CHK()
-
-  if test "$dblib" = "no"; then
-    AC_MSG_ERROR([Berkeley DB 3.x or later was not found.  You may need to 
-    supply the --with-bdb-libdir or --with-bdb-incdir configure options.])
-  fi
-
-  if test "$with_bdb_lib" != "none"; then
-    CMU_ADD_LIBPATH($with_bdb_lib)
-  fi
-
-  BDB_INC=${BDB_INCADD}
-  BDB_LIB=${BDB_LIBADD}
-  AC_SUBST(BDB_INC)
-  AC_SUBST(BDB_LIB)
-
-  LIBS="${LIBS} ${BDB_LIBADD}"
-  CPPFLAGS="${BDB_INCADD} ${CPPFLAGS}"
-  AC_DEFINE(HAVE_BDB,[],[Build in Berkeley DB support?])
-fi
-AM_CONDITIONAL([USE_BERKELEY], [test "$use_berkeley" != "no"])
+AM_CONDITIONAL([USE_BERKELEY], [test "$with_bdb" != "no"])
 
 dnl End Berkeley DB Detection
 
@@ -1800,7 +1779,7 @@
    pcre:               $cyrus_cv_pcre_utf8
 
 Database support:
-   bdb:                $use_berkeley
+   bdb:                $with_bdb
    mysql:              $with_mysql
    postgresql:         $use_pgsql
    sqlite:             $use_sqlite
----
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