# serial 1

dnl Find the compiler and linker flags for libcdb.
dnl
dnl Finds the compiler and linker flags for linking with the libcdb library.
dnl Provides the --with-libcdb, --with-libcdb-lib, and --with-libcdb-include
dnl configure options to specify non-standard paths to libcdb libraries.
dnl
dnl Provides the macros RRA_LIB_CDB and RRA_LIB_CDB_OPTIONAL and sets the
dnl substitution variables CDB_CPPFLAGS, CDB_LDFLAGS, and CDB_LIBS.  Also
dnl provides RRA_LIB_CDB_SWITCH to set CPPFLAGS, LDFLAGS, and LIBS to include
dnl the TinyCDB libraries, saving the current values, and RRA_LIB_CDB_RESTORE
dnl to restore those settings to before the last RRA_LIB_CDB_SWITCH.  Defines
dnl HAVE_CDB and sets rra_use_CDB to true if the library is found.
dnl
dnl Depends on the lib-helper.m4 framework.
dnl
dnl The canonical version of this file is maintained in the rra-c-util
dnl package, available at <https://www.eyrie.org/~eagle/software/rra-c-util/>.
dnl
dnl Written by Russ Allbery <eagle@eyrie.org>
dnl Copyright 2013
dnl     The Board of Trustees of the Leland Stanford Junior University
dnl
dnl This file is free software; the authors give unlimited permission to copy
dnl and/or distribute it, with or without modifications, as long as this
dnl notice is preserved.
dnl
dnl SPDX-License-Identifier: FSFULLR

dnl Save the current CPPFLAGS, LDFLAGS, and LIBS settings and switch to
dnl versions that include the TinyCDB flags.  Used as a wrapper, with
dnl RRA_LIB_CDB_RESTORE, around tests.
AC_DEFUN([RRA_LIB_CDB_SWITCH], [RRA_LIB_HELPER_SWITCH([CDB])])

dnl Restore CPPFLAGS, LDFLAGS, and LIBS to their previous values (before
dnl RRA_LIB_CDB_SWITCH was called).
AC_DEFUN([RRA_LIB_CDB_RESTORE], [RRA_LIB_HELPER_RESTORE([CDB])])

dnl Checks if the libcdb library is present.  The single argument, if "true",
dnl says to fail if the libcdb library could not be found.
AC_DEFUN([_RRA_LIB_CDB_INTERNAL],
[RRA_LIB_HELPER_PATHS([CDB])
 RRA_LIB_CDB_SWITCH
 AC_CHECK_LIB([cdb], [cdb_init], [CDB_LIBS=-lcdb],
    [AS_IF([test x"$1" = xtrue],
        [AC_MSG_ERROR([cannot find usable TinyCDB library])])])
 AC_CHECK_HEADERS([cdb.h])
 RRA_LIB_CDB_RESTORE])

dnl The main macro for packages with mandatory TinyCDB support.
AC_DEFUN([RRA_LIB_CDB],
[RRA_LIB_HELPER_VAR_INIT([CDB])
 RRA_LIB_HELPER_WITH([tinycdb], [TinyCDB], [CDB])
 _RRA_LIB_CDB_INTERNAL([true])
 rra_use_CDB=true
 AC_DEFINE([HAVE_CDB], 1, [Define if libcdb is available.])])

dnl The main macro for packages with optional TinyCDB support.
AC_DEFUN([RRA_LIB_CDB_OPTIONAL],
[RRA_LIB_HELPER_VAR_INIT([CDB])
 RRA_LIB_HELPER_WITH_OPTIONAL([tinycdb], [TinyCDB], [CDB])
 AS_IF([test x"$rra_use_CDB" != xfalse],
    [AS_IF([test x"$rra_use_CDB" = xtrue],
        [_RRA_LIB_CDB_INTERNAL([true])],
        [_RRA_LIB_CDB_INTERNAL([false])])])
 AS_IF([test x"$CDB_LIBS" != x],
    [rra_use_CDB=true
     AC_DEFINE([HAVE_CDB], 1, [Define if libcdb is available.])])])