path: root/aclocal.m4

# generated automatically by aclocal 1.16.3 -*- Autoconf -*-

# Copyright (C) 1996-2020 Free Software Foundation, Inc.

# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
# PARTICULAR PURPOSE.

m4_ifndef([AC_CONFIG_MACRO_DIRS], [m4_defun([_AM_CONFIG_MACRO_DIRS], [])m4_defun([AC_CONFIG_MACRO_DIRS], [_AM_CONFIG_MACRO_DIRS($@)])])
# ===============================================================================
#  https://www.gnu.org/software/autoconf-archive/ax_c_float_words_bigendian.html
# ===============================================================================
#
# SYNOPSIS
#
#   AX_C_FLOAT_WORDS_BIGENDIAN([ACTION-IF-TRUE], [ACTION-IF-FALSE], [ACTION-IF-UNKNOWN])
#
# DESCRIPTION
#
#   Checks the ordering of words within a multi-word float. This check is
#   necessary because on some systems (e.g. certain ARM systems), the float
#   word ordering can be different from the byte ordering. In a multi-word
#   float context, "big-endian" implies that the word containing the sign
#   bit is found in the memory location with the lowest address. This
#   implementation was inspired by the AC_C_BIGENDIAN macro in autoconf.
#
#   The endianness is detected by first compiling C code that contains a
#   special double float value, then grepping the resulting object file for
#   certain strings of ASCII values. The double is specially crafted to have
#   a binary representation that corresponds with a simple string. In this
#   implementation, the string "noonsees" was selected because the
#   individual word values ("noon" and "sees") are palindromes, thus making
#   this test byte-order agnostic. If grep finds the string "noonsees" in
#   the object file, the target platform stores float words in big-endian
#   order. If grep finds "seesnoon", float words are in little-endian order.
#   If neither value is found, the user is instructed to specify the
#   ordering.
#
# LICENSE
#
#   Copyright (c) 2008 Daniel Amelang <dan@amelang.net>
#
#   Copying and distribution of this file, with or without modification, are
#   permitted in any medium without royalty provided the copyright notice
#   and this notice are preserved. This file is offered as-is, without any
#   warranty.

#serial 11

AC_DEFUN([AX_C_FLOAT_WORDS_BIGENDIAN],
  [AC_CACHE_CHECK(whether float word ordering is bigendian,
                  ax_cv_c_float_words_bigendian, [

ax_cv_c_float_words_bigendian=unknown
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[

double d = 90904234967036810337470478905505011476211692735615632014797120844053488865816695273723469097858056257517020191247487429516932130503560650002327564517570778480236724525140520121371739201496540132640109977779420565776568942592.0;

]])], [

if grep noonsees conftest.$ac_objext >/dev/null ; then
  ax_cv_c_float_words_bigendian=yes
fi
if grep seesnoon conftest.$ac_objext >/dev/null ; then
  if test "$ax_cv_c_float_words_bigendian" = unknown; then
    ax_cv_c_float_words_bigendian=no
  else
    ax_cv_c_float_words_bigendian=unknown
  fi
fi

])])

case $ax_cv_c_float_words_bigendian in
  yes)
    m4_default([$1],
      [AC_DEFINE([FLOAT_WORDS_BIGENDIAN], 1,
                 [Define to 1 if your system stores words within floats
                  with the most significant word first])]) ;;
  no)
    $2 ;;
  *)
    m4_default([$3],
      [AC_MSG_ERROR([

Unknown float word ordering. You need to manually preset
ax_cv_c_float_words_bigendian=no (or yes) according to your system.

    ])]) ;;
esac

])# AX_C_FLOAT_WORDS_BIGENDIAN

# ===========================================================================
#  https://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html
# ===========================================================================
#
# SYNOPSIS
#
#   AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
#
# DESCRIPTION
#
#   Check whether the given FLAG works with the current language's compiler
#   or gives an error.  (Warnings, however, are ignored)
#
#   ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
#   success/failure.
#
#   If EXTRA-FLAGS is defined, it is added to the current language's default
#   flags (e.g. CFLAGS) when the check is done.  The check is thus made with
#   the flags: "CFLAGS EXTRA-FLAGS FLAG".  This can for example be used to
#   force the compiler to issue an error when a bad flag is given.
#
#   INPUT gives an alternative input source to AC_COMPILE_IFELSE.
#
#   NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
#   macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG.
#
# LICENSE
#
#   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
#   Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
#
#   Copying and distribution of this file, with or without modification, are
#   permitted in any medium without royalty provided the copyright notice
#   and this notice are preserved.  This file is offered as-is, without any
#   warranty.

#serial 6

AC_DEFUN([AX_CHECK_COMPILE_FLAG],
[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
  ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
  _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
  AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
    [AS_VAR_SET(CACHEVAR,[yes])],
    [AS_VAR_SET(CACHEVAR,[no])])
  _AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
AS_VAR_IF(CACHEVAR,yes,
  [m4_default([$2], :)],
  [m4_default([$3], :)])
AS_VAR_POPDEF([CACHEVAR])dnl
])dnl AX_CHECK_COMPILE_FLAGS

# ===========================================================================
#     https://www.gnu.org/software/autoconf-archive/ax_check_openssl.html
# ===========================================================================
#
# SYNOPSIS
#
#   AX_CHECK_OPENSSL([action-if-found[, action-if-not-found]])
#
# DESCRIPTION
#
#   Look for OpenSSL in a number of default spots, or in a user-selected
#   spot (via --with-openssl).  Sets
#
#     OPENSSL_INCLUDES to the include directives required
#     OPENSSL_LIBS to the -l directives required
#     OPENSSL_LDFLAGS to the -L or -R flags required
#
#   and calls ACTION-IF-FOUND or ACTION-IF-NOT-FOUND appropriately
#
#   This macro sets OPENSSL_INCLUDES such that source files should use the
#   openssl/ directory in include directives:
#
#     #include <openssl/hmac.h>
#
# LICENSE
#
#   Copyright (c) 2009,2010 Zmanda Inc. <http://www.zmanda.com/>
#   Copyright (c) 2009,2010 Dustin J. Mitchell <dustin@zmanda.com>
#
#   Copying and distribution of this file, with or without modification, are
#   permitted in any medium without royalty provided the copyright notice
#   and this notice are preserved. This file is offered as-is, without any
#   warranty.

#serial 10

AU_ALIAS([CHECK_SSL], [AX_CHECK_OPENSSL])
AC_DEFUN([AX_CHECK_OPENSSL], [
    found=false
    AC_ARG_WITH([openssl],
        [AS_HELP_STRING([--with-openssl=DIR],
            [root of the OpenSSL directory])],
        [
            case "$withval" in
            "" | y | ye | yes | n | no)
            AC_MSG_ERROR([Invalid --with-openssl value])
              ;;
            *) ssldirs="$withval"
              ;;
            esac
        ], [
            # if pkg-config is installed and openssl has installed a .pc file,
            # then use that information and don't search ssldirs
            AC_CHECK_TOOL([PKG_CONFIG], [pkg-config])
            if test x"$PKG_CONFIG" != x""; then
                OPENSSL_LDFLAGS=`$PKG_CONFIG openssl --libs-only-L 2>/dev/null`
                if test $? = 0; then
                    OPENSSL_LIBS=`$PKG_CONFIG openssl --libs-only-l 2>/dev/null`
                    OPENSSL_INCLUDES=`$PKG_CONFIG openssl --cflags-only-I 2>/dev/null`
                    found=true
                fi
            fi

            # no such luck; use some default ssldirs
            if ! $found; then
                ssldirs="/usr/local/ssl /usr/lib/ssl /usr/ssl /usr/pkg /usr/local /usr"
            fi
        ]
        )


    # note that we #include <openssl/foo.h>, so the OpenSSL headers have to be in
    # an 'openssl' subdirectory

    if ! $found; then
        OPENSSL_INCLUDES=
        for ssldir in $ssldirs; do
            AC_MSG_CHECKING([for openssl/ssl.h in $ssldir])
            if test -f "$ssldir/include/openssl/ssl.h"; then
                OPENSSL_INCLUDES="-I$ssldir/include"
                OPENSSL_LDFLAGS="-L$ssldir/lib"
                OPENSSL_LIBS="-lssl -lcrypto"
                found=true
                AC_MSG_RESULT([yes])
                break
            else
                AC_MSG_RESULT([no])
            fi
        done

        # if the file wasn't found, well, go ahead and try the link anyway -- maybe
        # it will just work!
    fi

    # try the preprocessor and linker with our new flags,
    # being careful not to pollute the global LIBS, LDFLAGS, and CPPFLAGS

    AC_MSG_CHECKING([whether compiling and linking against OpenSSL works])
    echo "Trying link with OPENSSL_LDFLAGS=$OPENSSL_LDFLAGS;" \
        "OPENSSL_LIBS=$OPENSSL_LIBS; OPENSSL_INCLUDES=$OPENSSL_INCLUDES" >&AS_MESSAGE_LOG_FD

    save_LIBS="$LIBS"
    save_LDFLAGS="$LDFLAGS"
    save_CPPFLAGS="$CPPFLAGS"
    LDFLAGS="$LDFLAGS $OPENSSL_LDFLAGS"
    LIBS="$OPENSSL_LIBS $LIBS"
    CPPFLAGS="$OPENSSL_INCLUDES $CPPFLAGS"
    AC_LINK_IFELSE(
        [AC_LANG_PROGRAM([#include <openssl/ssl.h>], [SSL_new(NULL)])],
        [
            AC_MSG_RESULT([yes])
            $1
        ], [
            AC_MSG_RESULT([no])
            $2
        ])
    CPPFLAGS="$save_CPPFLAGS"
    LDFLAGS="$save_LDFLAGS"
    LIBS="$save_LIBS"

    AC_SUBST([OPENSSL_INCLUDES])
    AC_SUBST([OPENSSL_LIBS])
    AC_SUBST([OPENSSL_LDFLAGS])
])