rulex

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# ===========================================================================
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#      http://www.gnu.org/software/autoconf-archive/ax_berkeley_db.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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#   AX_BERKELEY_DB([MINIMUM-VERSION [, ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])
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#
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# DESCRIPTION
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#
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#   This macro tries to find Berkeley DB. It honors MINIMUM-VERSION if
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#   given.
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#
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#   If libdb is found, DB_HEADER and DB_LIBS variables are set and
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#   ACTION-IF-FOUND shell code is executed if specified. DB_HEADER is set to
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#   location of db.h header in quotes (e.g. "db3/db.h") and
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#   AC_DEFINE_UNQUOTED is called on it, so that you can type
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#
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#     #include DB_HEADER
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#
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#   in your C/C++ code. DB_LIBS is set to linker flags needed to link
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#   against the library (e.g. -ldb3.1) and AC_SUBST is called on it.
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#
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#   when specified user-selected spot (via --with-libdb) also sets
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#
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#     DB_CPPFLAGS to the include directives required
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#     DB_LDFLAGS to the -L flags required
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#
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# LICENSE
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#
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#   Copyright (c) 2008 Vaclav Slavik <vaclav.slavik@matfyz.cz>
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#   Copyright (c) 2014 Kirill A. Korinskiy <catap@catap.ru>
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#
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#   Copying and distribution of this file, with or without modification, are
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#   permitted in any medium without royalty provided the copyright notice
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#   and this notice are preserved. This file is offered as-is, without any
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#   warranty.
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#
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#   Modified by Igor B. Poretsky <poretsky@mlbox.ru>
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#   especially for the RuLex project in order to accept newer DB versions
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#   and to cope with some uncommon situations.
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#serial 8
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AC_DEFUN([AX_BERKELEY_DB],
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[
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  old_LIBS="$LIBS"
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  old_LDFLAGS="$LDFLAGS"
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  old_CFLAGS="$CFLAGS"
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  libdbdir=""
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  AC_ARG_WITH(libdb,
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    AS_HELP_STRING([--with-libdb=DIR],
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        [root of the Berkeley DB directory]),
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    [
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        case "$withval" in
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        "" | y | ye | yes | n | no)
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        AC_MSG_ERROR([Invalid --with-libdb value])
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          ;;
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        *) libdbdir="$withval"
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          ;;
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        esac
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    ], [])
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  minversion=ifelse([$1], ,,$1)
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  DB_HEADER=""
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  DB_LIBS=""
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  DB_LDFLAGS=""
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  DB_CFLAGS=""
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  if test -z $minversion ; then
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      minvermajor=0
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      minverminor=0
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      minverpatch=0
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      AC_MSG_CHECKING([for Berkeley DB])
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  else
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      minvermajor=`echo $minversion | cut -d. -f1`
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      minverminor=`echo $minversion | cut -d. -f2`
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      minverpatch=`echo $minversion | cut -d. -f3`
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      minvermajor=${minvermajor:-0}
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      minverminor=${minverminor:-0}
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      minverpatch=${minverpatch:-0}
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      AC_MSG_CHECKING([for Berkeley DB >= $minversion])
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  fi
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  if test x$libdbdir != x""; then
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    DB_CFLAGS="-I${libdbdir}/include"
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    DB_LDFLAGS="-L${libdbdir}/lib"
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    LDFLAGS="$DB_LDFLAGS $old_LDFLAGS"
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    CFLAGS="$DB_CFLAGS $old_CPPFLAGS"
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  fi
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  for version in "" 5.3 5.1 5.0 4.9 4.8 4.7 4.6 4.5 4.4 4.3 4.2 4.1 4.0 3.6 3.5 3.4 3.3 3.2 3.1 ; do
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    if test -z $version ; then
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        db_lib="-ldb"
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        try_headers="db.h"
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    else
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        db_lib="-ldb-$version"
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        try_headers="db$version/db.h db`echo $version | sed -e 's,\..*,,g'`/db.h db.h"
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    fi
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    LIBS="$old_LIBS $db_lib"
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    for db_hdr in $try_headers ; do
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        if test -z $DB_HEADER ; then
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            AC_LINK_IFELSE(
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                [AC_LANG_PROGRAM(
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                    [
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                        #include <${db_hdr}>
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                    ],
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                    [
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                        #if !((DB_VERSION_MAJOR > (${minvermajor}) || \
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                              (DB_VERSION_MAJOR == (${minvermajor}) && \
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                                    DB_VERSION_MINOR > (${minverminor})) || \
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                              (DB_VERSION_MAJOR == (${minvermajor}) && \
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                                    DB_VERSION_MINOR == (${minverminor}) && \
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                                    DB_VERSION_PATCH >= (${minverpatch}))))
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                            #error "too old version"
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                        #endif
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                        DB *db;
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                        db_create(&db, NULL, 0);
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                    ])],
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                [
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                    AC_MSG_RESULT([header $db_hdr, library $db_lib])
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                    DB_HEADER="$db_hdr"
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                    DB_LIBS="$db_lib"
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                ])
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        fi
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    done
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  done
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  LIBS="$old_LIBS"
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  LDFLAGS="$old_LDFLAGS"
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  CFLAGS="$old_CPPFLAGS"
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  if test -z $DB_HEADER ; then
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    AC_MSG_RESULT([not found])
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    DB_LDFLAGS=""
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    DB_CFLAGS=""
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    ifelse([$3], , :, [$3])
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  else
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    AC_DEFINE_UNQUOTED(DB_HEADER, ["$DB_HEADER"], ["Berkeley DB Header File"])
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    AC_SUBST(DB_LIBS)
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    AC_SUBST(DB_LDFLAGS)
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    AC_SUBST(DB_CFLAGS)
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    ifelse([$2], , :, [$2])
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  fi
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])
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