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#
# Copyright 2021 Northern.tech AS
#
# This file is part of CFEngine 3 - written and maintained by Northern.tech AS.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# http://www.apache.org/licenses/LICENSE-2.0
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# To the extent this program is licensed as part of the Enterprise
# versions of CFEngine, the applicable Commercial Open Source License
# (COSL) may apply to this file if you as a licensee so wish it. See
# included file COSL.txt.
#
dnl
dnl Arguments:
dnl $1 - function name
dnl $2 - headers (to compile $3)
dnl $3 - body for compilation
dnl $4 - function invocation
dnl
dnl This macro checks that the function (argument 1) is defined,
dnl and that the code piece (arguments 2, 3, like in AC_LANG_PROGRAM) can be
dnl compiled.
dnl
dnl If the code compiles successfully, it defines HAVE_$1_PROPER macro.
dnl
dnl If the code fails, it adds '$4' to $post_macros variable.
dnl If you want rpl_$1.c to be compiled as a replacement, call
dnl CF3_REPLACE_PROPER_FUNC with the same function name.
dnl
dnl ** How to use **
dnl
dnl CF3_CHECK_PROPER_FUNC(function, [#include <stdio.h>], [void function(FILE *);], [#define function rpl_function])
dnl CF3_REPLACE_PROPER_FUNC(function)
dnl
dnl Then in libutils/platform.h:
dnl
dnl #if !HAVE_FUNCTION_PROPER
dnl void rpl_function(FILE *);
dnl #endif
dnl
dnl And libcompat/rpl_function.c:
dnl
dnl #include "platform.h"
dnl
dnl void rpl_function(FILE *) { ... }
dnl
AC_DEFUN([CF3_CHECK_PROPER_FUNC],
[
AC_CHECK_FUNC([$1], [], [AC_MSG_ERROR([Unable to find function $1])])
AC_CACHE_CHECK([whether $1 is properly declared],
[hw_cv_func_$1_proper],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([$2],[$3])],
[hw_cv_func_$1_proper=yes],
[hw_cv_func_$1_proper=no])])
AC_SUBST([hw_cv_func_$1_proper])
AS_IF([test "$hw_cv_func_$1_proper" = yes],
[AC_DEFINE([HAVE_$1_PROPER], [1], [Define to 1 if you have properly defined `$1' function])],
[post_macros="$post_macros
$4"])
])
AC_DEFUN([CF3_REPLACE_PROPER_FUNC],
[
AS_IF([test "$hw_cv_func_$1_proper" = "no"],
[AC_LIBOBJ(rpl_$1)]
)
])
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