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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_prototype.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_PROTOTYPE(function, includes, code, TAG1, values1 [, TAG2, values2 [...]])
#
# DESCRIPTION
#
# Try all the combinations of <TAG1>, <TAG2>... to successfully compile
# <code>. <TAG1>, <TAG2>, ... are substituted in <code> and <include> with
# values found in <values1>, <values2>, ... respectively. <values1>,
# <values2>, ... contain a list of possible values for each corresponding
# tag and all combinations are tested. When AC_TRY_COMPILE(include, code)
# is successful for a given substitution, the macro stops and defines the
# following macros: FUNCTION_TAG1, FUNCTION_TAG2, ... using AC_DEFINE()
# with values set to the current values of <TAG1>, <TAG2>, ... If no
# combination is successful the configure script is aborted with a
# message.
#
# Intended purpose is to find which combination of argument types is
# acceptable for a given function <function>. It is recommended to list
# the most specific types first. For instance ARG1, [size_t, int] instead
# of ARG1, [int, size_t].
#
# Generic usage pattern:
#
# 1) add a call in configure.ac
#
# AX_PROTOTYPE(...)
#
# 2) call autoheader to see which symbols are not covered
#
# 3) add the lines in config.h
#
# /* Type of Nth argument of function */
# #undef FUNCTION_ARGN
#
# 4) Within the code use FUNCTION_ARGN instead of an hardwired type
#
# Complete example:
#
# 1) configure.ac
#
# AX_PROTOTYPE(getpeername,
# [
# #include <sys/types.h>
# #include <sys/socket.h>
# ],
# [
# int a = 0;
# ARG2 * b = 0;
# ARG3 * c = 0;
# getpeername(a, b, c);
# ],
# ARG2, [struct sockaddr, void],
# ARG3, [socklen_t, size_t, int, unsigned int, long unsigned int])
#
# 2) call autoheader
#
# autoheader: Symbol `GETPEERNAME_ARG2' is not covered by ./config.h
# autoheader: Symbol `GETPEERNAME_ARG3' is not covered by ./config.h
#
# 3) config.h
#
# /* Type of second argument of getpeername */
# #undef GETPEERNAME_ARG2
#
# /* Type of third argument of getpeername */
# #undef GETPEERNAME_ARG3
#
# 4) in the code
#
# ...
# GETPEERNAME_ARG2 name;
# GETPEERNAME_ARG3 namelen;
# ...
# ret = getpeername(socket, &name, &namelen);
# ...
#
# Implementation notes: generating all possible permutations of the
# arguments is not easily done with the usual mixture of shell and m4,
# that is why this macro is almost 100% m4 code. It generates long but
# simple to read code.
#
# LICENSE
#
# Copyright (c) 2009 Loic Dachary <loic@senga.org>
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2 of the License, or (at your
# option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
# Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program. If not, see <https://www.gnu.org/licenses/>.
#
# As a special exception, the respective Autoconf Macro's copyright owner
# gives unlimited permission to copy, distribute and modify the configure
# scripts that are the output of Autoconf when processing the Macro. You
# need not follow the terms of the GNU General Public License when using
# or distributing such scripts, even though portions of the text of the
# Macro appear in them. The GNU General Public License (GPL) does govern
# all other use of the material that constitutes the Autoconf Macro.
#
# This special exception to the GPL applies to versions of the Autoconf
# Macro released by the Autoconf Archive. When you make and distribute a
# modified version of the Autoconf Macro, you may extend this special
# exception to the GPL to apply to your modified version as well.
#serial 10
AU_ALIAS([AC_PROTOTYPE], [AX_PROTOTYPE])
AC_DEFUN([AX_PROTOTYPE],[
dnl
dnl Upper case function name
dnl
pushdef([function],translit([$1], [a-z], [A-Z]))
dnl
dnl Collect tags that will be substituted
dnl
pushdef([tags],[AX_PROTOTYPE_TAGS(builtin([shift],builtin([shift],builtin([shift],$@))))])
dnl
dnl Wrap in a 1 time loop, when a combination is found break to stop the combinatory exploration
dnl
for i in 1
do
AX_PROTOTYPE_LOOP(AX_PROTOTYPE_REVERSE($1, AX_PROTOTYPE_SUBST($2,tags),AX_PROTOTYPE_SUBST($3,tags),builtin([shift],builtin([shift],builtin([shift],$@)))))
AC_MSG_ERROR($1 unable to find a working combination)
done
popdef([tags])
popdef([function])
])
dnl
dnl AX_PROTOTYPE_REVERSE(list)
dnl
dnl Reverse the order of the <list>
dnl
AC_DEFUN([AX_PROTOTYPE_REVERSE],[ifelse($#,0,,$#,1,[[$1]],[AX_PROTOTYPE_REVERSE(builtin([shift],$@)),[$1]])])
dnl
dnl AX_PROTOTYPE_SUBST(string, tag)
dnl
dnl Substitute all occurrence of <tag> in <string> with <tag>_VAL.
dnl Assumes that tag_VAL is a macro containing the value associated to tag.
dnl
AC_DEFUN([AX_PROTOTYPE_SUBST],[ifelse($2,,[$1],[AX_PROTOTYPE_SUBST(patsubst([$1],[$2],[$2[]_VAL]),builtin([shift],builtin([shift],$@)))])])
dnl
dnl AX_PROTOTYPE_TAGS([tag, values, [tag, values ...]])
dnl
dnl Generate a list of <tag> by skipping <values>.
dnl
AC_DEFUN([AX_PROTOTYPE_TAGS],[ifelse($1,,[],[$1, AX_PROTOTYPE_TAGS(builtin([shift],builtin([shift],$@)))])])
dnl
dnl AX_PROTOTYPE_DEFINES(tags)
dnl
dnl Generate a AC_DEFINE(function_tag, tag_VAL) for each tag in <tags> list
dnl Assumes that function is a macro containing the name of the function in upper case
dnl and that tag_VAL is a macro containing the value associated to tag.
dnl
AC_DEFUN([AX_PROTOTYPE_DEFINES],[ifelse($1,,[],
[AC_DEFINE(function[]_$1, $1_VAL)
AC_SUBST(function[]_$1, "$1_VAL")
AX_PROTOTYPE_DEFINES(builtin([shift],$@))])])
dnl
dnl AX_PROTOTYPE_STATUS(tags)
dnl
dnl Generates a message suitable for argument to AC_MSG_* macros. For each tag
dnl in the <tags> list the message tag => tag_VAL is generated.
dnl Assumes that tag_VAL is a macro containing the value associated to tag.
dnl
AC_DEFUN([AX_PROTOTYPE_STATUS],[ifelse($1,,[],[$1 => $1_VAL AX_PROTOTYPE_STATUS(builtin([shift],$@))])])
dnl
dnl AX_PROTOTYPE_EACH(tag, values)
dnl
dnl Call AX_PROTOTYPE_LOOP for each values and define the macro tag_VAL to
dnl the current value.
dnl
AC_DEFUN([AX_PROTOTYPE_EACH],[
ifelse($2,, [
], [
pushdef([$1_VAL], $2)
AX_PROTOTYPE_LOOP(rest)
popdef([$1_VAL])
AX_PROTOTYPE_EACH($1, builtin([shift], builtin([shift], $@)))
])
])
dnl
dnl AX_PROTOTYPE_LOOP([tag, values, [tag, values ...]], code, include, function)
dnl
dnl If there is a tag/values pair, call AX_PROTOTYPE_EACH with it.
dnl If there is no tag/values pair left, tries to compile the code and include
dnl using AC_TRY_COMPILE. If it compiles, AC_DEFINE all the tags to their
dnl current value and exit with success.
dnl
AC_DEFUN([AX_PROTOTYPE_LOOP],[
ifelse(builtin([eval], $# > 3), 1,
[
pushdef([rest],[builtin([shift],builtin([shift],$@))])
AX_PROTOTYPE_EACH($2,$1)
popdef([rest])
], [
AC_MSG_CHECKING($3 AX_PROTOTYPE_STATUS(tags))
dnl
dnl Activate fatal warnings if possible, gives better guess
dnl
ac_save_CPPFLAGS="$CPPFLAGS"
dnl ifelse(AC_LANG,CPLUSPLUS,if test "$GXX" = "yes" ; then CPPFLAGS="$CPPFLAGS -Werror" ; fi)
dnl ifelse(AC_LANG,C,if test "$GCC" = "yes" ; then CPPFLAGS="$CPPFLAGS -Werror" ; fi)
dnl TODO: consider the compiler check from ax_cflags_warn_all.m4
if (test "x$GCC" = "xyes" || test "x$GXX" = "xyes" ); then CPPFLAGS="$CPPFLAGS -Werror" ; fi
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$2], [$1])],
[
CPPFLAGS="$ac_save_CPPFLAGS"
AC_MSG_RESULT(ok)
AX_PROTOTYPE_DEFINES(tags)
break;
], [
CPPFLAGS="$ac_save_CPPFLAGS"
AC_MSG_RESULT(not ok)
])
]
)
])
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