configure.ac

dnl configure.ac
dnl Process this file with autoconf to produce a configure script.
#
# This file is part of mpop, a POP3 client.
#
# Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012,
# 2013, 2014, 2015, 2016, 2018, 2019, 2020, 2021, 2022, 2023, 2024
# Christophe Nowicki
# Martin Lambers <marlam@marlam.de>
# Jay Soffian <jaysoffian@gmail.com> (Mac OS X keychain support)
#
#   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 3 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 <http://www.gnu.org/licenses/>.
#

dnl Autotools init stuff
AC_INIT([mpop],[1.4.21],[marlam@marlam.de],[mpop],[https://marlam.de/mpop])
AC_CONFIG_SRCDIR([src/mpop.c])
AC_CONFIG_AUX_DIR([build-aux])
AC_CONFIG_HEADERS([config.h])
AC_CANONICAL_TARGET
AC_USE_SYSTEM_EXTENSIONS
AC_SYS_LARGEFILE
AM_INIT_AUTOMAKE([1.11.1 silent-rules no-texinfo.tex -Wall])
AM_SILENT_RULES([yes])
AC_PROG_CC
AC_PROG_INSTALL
AC_LANG([C])

dnl System
build_mpopd_default="yes"
AC_DEFINE_UNQUOTED([PLATFORM], ["${target}"], [Platform triplet])
case "${target}" in *-*-mingw*) LIBS="$LIBS -lws2_32"; build_mpopd_default="no" ;; esac

dnl Gettext
AM_GNU_GETTEXT_REQUIRE_VERSION([0.21])
AM_GNU_GETTEXT([external])

dnl Headers and functions
AC_CHECK_HEADERS([sysexits.h netdb.h arpa/inet.h sys/select.h sys/socket.h sys/wait.h netinet/in.h langinfo.h])
AC_CHECK_FUNCS([fseeko fseeko64 getpass link sigaction signal strndup syslog vasprintf])
AC_SEARCH_LIBS([nanosleep], [rt posix4])
AC_SEARCH_LIBS([socket], [socket])

dnl Unfortunately AC_SEARCH_LIBS([res_query], [resolv]) does not work because we
dnl apparently need to include the appropriate header files, so we use a double
dnl AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[]])],[],[]) instead.
AC_MSG_CHECKING([for library containing res_query])
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
    #include <netinet/in.h>
    #include <arpa/nameser.h>
    #include <resolv.h>
    ]], [[res_query(0, 0, 0, 0, 0); ns_initparse(0, 0, 0);]])],[found_res_query=yes],[found_res_query=no])
if test "$found_res_query" = "yes"; then
    AC_MSG_RESULT([none required])
else
    LIBS_BAK="$LIBS"
    LIBS="$LIBS -lresolv"
    AC_LINK_IFELSE([AC_LANG_PROGRAM([[
        #include <netinet/in.h>
        #include <arpa/nameser.h>
        #include <resolv.h>
        ]], [[res_query(0, 0, 0, 0, 0); ns_initparse(0, 0, 0);]])],[found_res_query=yes],[found_res_query=no])
    if test "$found_res_query" = "yes"; then
        AC_MSG_RESULT([-lresolv])
    else
        LIBS="$LIBS_BAK"
        AC_MSG_RESULT([none])
    fi
fi
if test "$found_res_query" = "yes"; then
    AC_DEFINE([HAVE_LIBRESOLV], [1], [Define to 1 if libresolv is available])
fi

dnl pkg-config (required to detect libraries)
PKG_PROG_PKG_CONFIG([])
if test -z "$PKG_CONFIG"; then
    AC_MSG_ERROR([pkg-config not found])
fi

dnl TLS
have_tls="no"
tls_lib="none"
want_tls="yes"
want_gnutls="yes"
want_openssl="no"
want_libtls="no"
tls_CFLAGS=""
tls_LIBS=""
with_ssl_was_used=no
AC_ARG_WITH([tls], [AS_HELP_STRING([--with-tls=[gnutls|openssl|libtls|no]],
    [TLS support: GnuTLS (default), OpenSSL (discouraged), libtls, or none.])],
    if test "$withval" = "gnutls"; then
	want_tls=yes
	want_gnutls=yes
	want_openssl=no
	want_libtls=no
    elif test "$withval" = "openssl"; then
	want_tls=yes
	want_gnutls=no
	want_openssl=yes
	want_libtls=no
    elif test "$withval" = "libtls"; then
	want_tls=yes
	want_gnutls=no
	want_openssl=no
	want_libtls=yes
    elif test "$withval" = "no"; then
	want_tls=no
	want_gnutls=no
	want_openssl=no
	want_libtls=no
    else
	AC_MSG_ERROR([Use --with-tls=gnutls or --with-tls=openssl or --with-tls=libtls or --with-tls=no])
    fi)
if test "$want_gnutls" = "yes"; then
    PKG_CHECK_MODULES([libgnutls], [gnutls >= 3.7.2], [HAVE_LIBGNUTLS=1], [HAVE_LIBGNUTLS=0])
    if test "$HAVE_LIBGNUTLS" != "1"; then
	AC_MSG_WARN([library libgnutls not found:])
	AC_MSG_WARN([$libgnutls_PKG_ERRORS])
	AC_MSG_WARN([libgnutls is provided by GnuTLS])
    else
	have_tls="yes"
	tls_lib="GnuTLS"
	tls_CFLAGS="$libgnutls_CFLAGS"
	tls_LIBS="$libgnutls_LIBS"
	AC_DEFINE([HAVE_LIBGNUTLS], [1], [Define to 1 if libgnutls is available])
    fi
fi
if test "$want_openssl" = "yes" -a "$have_tls" = "no"; then
    AC_MSG_WARN([Using OpenSSL is discouraged; consider using GnuTLS instead])
    PKG_CHECK_MODULES([libssl], [openssl >= 0.0], [HAVE_LIBSSL=1], [HAVE_LIBSSL=0])
    if test "$HAVE_LIBSSL" != "1"; then
	AC_MSG_WARN([library libssl not found:])
	AC_MSG_WARN([$libssl_PKG_ERRORS])
	AC_MSG_WARN([libssl is provided by OpenSSL])
    else
	have_tls="yes"
	tls_lib="OpenSSL"
	tls_CFLAGS="$libssl_CFLAGS"
	tls_LIBS="$libssl_LIBS"
	AC_DEFINE([HAVE_LIBSSL], [1], [Define to 1 if libssl is available])
    fi
fi
if test "$want_libtls" = "yes" -a "$have_tls" = "no"; then
    PKG_CHECK_MODULES([libtls], [libtls >= 0.0], [HAVE_LIBTLS=1], [HAVE_LIBTLS=0])
    if test "$HAVE_LIBTLS" != "1"; then
	AC_MSG_WARN([library libtls not found:])
	AC_MSG_WARN([$libtls_PKG_ERRORS])
	AC_MSG_WARN([libtls is provided by LibreSSL])
    else
	have_tls="yes"
	tls_lib="libtls"
	tls_CFLAGS="$libtls_CFLAGS"
	tls_LIBS="$libtls_LIBS"
	AC_DEFINE([HAVE_LIBTLS], [1], [Define to 1 if libtls is available])
    fi
fi
if test "$have_tls" = "yes"; then
    AC_DEFINE([HAVE_TLS], [1], [Define to 1 to build with TLS/SSL support])
elif test "$want_tls" = "yes"; then
    AC_MSG_WARN([Disabling TLS support, which is very bad. Consider using GnuTLS!])
fi
AM_CONDITIONAL([HAVE_TLS], [test "$have_tls" = "yes"])
AM_CONDITIONAL([HAVE_GNUTLS], [test "$tls_lib" = "GnuTLS"])
AM_CONDITIONAL([HAVE_OPENSSL], [test "$tls_lib" = "OpenSSL"])
AM_CONDITIONAL([HAVE_LIBTLS], [test "$tls_lib" = "libtls"])
AC_SUBST([tls_CFLAGS])
AC_SUBST([tls_LIBS])

dnl GNU SASL
AC_ARG_WITH([libgsasl], [AS_HELP_STRING([--with-libgsasl],
	[Use GNU SASL authentication library.])],
    [libgsasl=$withval], [libgsasl=yes])
if test "$libgsasl" != "no"; then
    PKG_CHECK_MODULES([libgsasl], [libgsasl >= 2.1], [HAVE_LIBGSASL=1], [HAVE_LIBGSASL=0])
    if test "$HAVE_LIBGSASL" != "1"; then
	AC_MSG_WARN([library libgsasl not found:])
	AC_MSG_WARN([$libgsasl_PKG_ERRORS])
	AC_MSG_WARN([libgsasl is provided by GNU SASL])
	libgsasl="no"
    else
	libgsasl="yes"
	AC_DEFINE([HAVE_LIBGSASL], [1], [Define to 1 if libgsasl is available])
    fi
fi
AM_CONDITIONAL([HAVE_LIBGSASL], [test "$libgsasl" = "yes"])

dnl Check if getaddrinfo() has IDN support (and we want to use it)
AC_ARG_ENABLE([gai-idn],
    [AS_HELP_STRING([--enable-gai-idn], [Use IDN support from getaddrinfo if available. Enabled by default.])],
    [if test "$enableval" = "yes"; then want_gai_idn="yes"; else want_gai_idn="no"; fi], [want_gai_idn="yes"])
have_gai_idn=no
if test "$want_gai_idn" = "yes"; then
    dnl TODO: in the future there may be getaddrinfo() implementations that
    dnl support IDN without requiring AI_IDN
    AC_CHECK_DECL([AI_IDN], [], [],
    [
     #include <sys/types.h>
     #include <sys/socket.h>
     #include <netdb.h>
    ])
    if test "$ac_cv_have_decl_AI_IDN" = "yes"; then
	dnl AI_IDN is defined, now check if it is actually supported
	dnl (glibc without libidn will return EAI_BADFLAGS)
        AC_MSG_CHECKING([whether getaddrinfo accepts AI_IDN])
	AC_RUN_IFELSE(
            [AC_LANG_PROGRAM(
            [[
             #include <sys/types.h>
             #include <sys/socket.h>
	     #include <netdb.h>
            ]],
            [[
             struct addrinfo hints;
             struct addrinfo *res;
             int r;
             hints.ai_flags = AI_IDN;
             hints.ai_family = PF_UNSPEC;
             hints.ai_socktype = SOCK_STREAM;
             hints.ai_protocol = 0;
             hints.ai_addrlen = 0;
             hints.ai_addr = 0;
             hints.ai_canonname = 0;
             hints.ai_next = 0;
             r = getaddrinfo("localhost", "1234", &hints, &res);
             freeaddrinfo(res);
             return (r == EAI_BADFLAGS ? 1 : 0);
	    ]])],
            [have_gai_idn="yes"],
	    [have_gai_idn="no"],
	    [have_gai_idn="assuming yes"])
        AC_MSG_RESULT([$have_gai_idn])
        if test "$have_gai_idn" = "assuming yes"; then
            AC_MSG_NOTICE([if this assumption is wrong, use --disable-gai-idn])
            have_gai_idn="yes"
        fi
        if test "$have_gai_idn" = "yes"; then
            AC_DEFINE([HAVE_GAI_IDN], [1], [Define to 1 if getaddrinfo supports IDN])
        fi
    fi
fi

dnl GNU Libidn
AC_ARG_WITH([libidn], [AS_HELP_STRING([--with-libidn],
	[Support IDN (needs GNU Libidn)])],
    [libidn=$withval], [libidn=yes])
if test "$libidn" != "no"; then
    PKG_CHECK_MODULES([libidn2], [libidn2 >= 0.0], [HAVE_LIBIDN=1], [HAVE_LIBIDN=0])
    if test "$HAVE_LIBIDN" != "1"; then
	AC_MSG_WARN([library libidn not found:])
	AC_MSG_WARN([$libidn_PKG_ERRORS])
	AC_MSG_WARN([libidn is provided by GNU Libidn])
	libidn="no"
    else
	libidn="yes"
	AC_DEFINE([HAVE_LIBIDN], [1], [Define to 1 if libidn is available])
    fi
fi

dnl libsecret support (requires pkg-config).
AC_ARG_WITH([libsecret], [AS_HELP_STRING([--with-libsecret],
	[Support libsecret (GNOME password management)])],
    [libsecret=$withval],[libsecret=yes])
if test "$libsecret" != "no"; then
    PKG_CHECK_MODULES([libsecret], [libsecret-1], [HAVE_LIBSECRET=1], [HAVE_LIBSECRET=0])
    if test "$HAVE_LIBSECRET" != "1"; then
	AC_MSG_WARN([library libsecret not found:])
	AC_MSG_WARN([$libsecret_PKG_ERRORS])
	AC_MSG_WARN([libsecret is provided by Gnome])
	libsecret="no"
    else
	libsecret="yes"
	AC_DEFINE([HAVE_LIBSECRET], [1], [Define to 1 if libsecret is available])
    fi
fi

dnl MacOS X Keychain Services (Security Framework)
AC_ARG_WITH([macosx-keyring], [AS_HELP_STRING([--with-macosx-keyring],
	[Support Mac OS X Keyring])],
    [macosx_keyring=$withval],[macosx_keyring=yes])
if test "$macosx_keyring" != "no"; then
    AC_CACHE_CHECK([for SecKeychainGetVersion],
	ac_cv_func_SecKeychainGetVersion,
	[ac_save_LIBS="$LIBS"
	 LIBS="$LIBS -Wl,-framework -Wl,Security"
	 AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <Security/Security.h>]], [[SecKeychainGetVersion(NULL);]])],[ac_cv_func_SecKeychainGetVersion=yes],[ac_cv_func_SecKeychainGetVersion=no])
	 LIBS="$ac_save_LIBS"])
    if test $ac_cv_func_SecKeychainGetVersion = yes; then
	macosx_keyring=yes
	AC_DEFINE([HAVE_MACOSXKEYRING], [1],
	    [Define to 1 if you have the MacOS X Keychain Services API.])
	LIBS="$LIBS -Wl,-framework -Wl,Security"
    else
	macosx_keyring=no
    fi
fi

dnl Check if mpopd should be built
AC_ARG_WITH([mpopd],
    [AS_HELP_STRING([--with-mpopd], [Build mpopd. Enabled by default.])],
    [if test "$withval" = "yes"; then build_mpopd="yes"; else build_mpopd="no"; fi], [build_mpopd="$build_mpopd_default"])
AM_CONDITIONAL([BUILD_MPOPD], [test "$build_mpopd" = "yes"])

dnl Global #defines for all source files
AH_VERBATIM([W32_NATIVE],
[/* Define to 1 if the native W32 API should be used. */
#if (defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__
#define W32_NATIVE 1
#endif])

dnl End.
AC_CONFIG_FILES([Makefile src/Makefile po/Makefile.in doc/Makefile scripts/Makefile])
AC_OUTPUT

echo
echo "Install prefix ......... : $prefix"
echo "NLS support ............ : $USE_NLS"
echo "TLS support ............ : $have_tls (Library: $tls_lib)"
echo "IDN support ............ : $libidn"
echo "GNU SASL support ....... : $libgsasl"
echo "Libsecret support (GNOME): $libsecret"
echo "MacOS X Keychain support : $macosx_keyring"
echo "Build mpopd .............: $build_mpopd"