gnupg/acinclude.m4

dnl macros to configure gnupg
dnl Copyright (C) 1998, 1999, 2000, 2001, 2003 Free Software Foundation, Inc.
dnl
dnl This file is part of GnuPG.
dnl
dnl GnuPG is free software; you can redistribute it and/or modify
dnl it under the terms of the GNU General Public License as published by
dnl the Free Software Foundation; either version 3 of the License, or
dnl (at your option) any later version.
dnl
dnl GnuPG is distributed in the hope that it will be useful,
dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
dnl GNU General Public License for more details.
dnl
dnl You should have received a copy of the GNU General Public License
dnl along with this program; if not, see <https://www.gnu.org/licenses/>.

dnl GNUPG_CHECK_TYPEDEF(TYPE, HAVE_NAME)
dnl Check whether a typedef exists and create a #define $2 if it exists
dnl
AC_DEFUN([GNUPG_CHECK_TYPEDEF],
  [ AC_MSG_CHECKING(for $1 typedef)
    AC_CACHE_VAL(gnupg_cv_typedef_$1,
    [AC_TRY_COMPILE([#define _GNU_SOURCE 1
    #include <stdlib.h>
    #include <sys/types.h>], [
    #undef $1
    int a = sizeof($1);
    ], gnupg_cv_typedef_$1=yes, gnupg_cv_typedef_$1=no )])
    AC_MSG_RESULT($gnupg_cv_typedef_$1)
    if test "$gnupg_cv_typedef_$1" = yes; then
        AC_DEFINE($2,1,[Defined if a `]$1[' is typedef'd])
    fi
  ])


dnl GNUPG_CHECK_GNUMAKE
dnl
AC_DEFUN([GNUPG_CHECK_GNUMAKE],
  [
    if ${MAKE-make} --version 2>/dev/null | grep '^GNU ' >/dev/null 2>&1; then
        :
    else
        AC_MSG_WARN([[
***
*** It seems that you are not using GNU make.  Some make tools have serious
*** flaws and you may not be able to build this software at all. Before you
*** complain, please try GNU make:  GNU make is easy to build and available
*** at all GNU archives.  It is always available from ftp.gnu.org:/gnu/make.
***]])
    fi
  ])

dnl GNUPG_CHECK_FAQPROG
dnl
AC_DEFUN([GNUPG_CHECK_FAQPROG],
  [ AC_MSG_CHECKING(for faqprog.pl)
    if faqprog.pl -V 2>/dev/null | grep '^faqprog.pl ' >/dev/null 2>&1; then
        working_faqprog=yes
        FAQPROG="faqprog.pl"
    else
	working_faqprog=no
        FAQPROG=": "
    fi
    AC_MSG_RESULT($working_faqprog)
    AC_SUBST(FAQPROG)
    AM_CONDITIONAL(WORKING_FAQPROG, test "$working_faqprog" = "yes" )

dnl     if test $working_faqprog = no; then
dnl         AC_MSG_WARN([[
dnl ***
dnl *** It seems that the faqprog.pl program is not installed;
dnl *** however it is only needed if you want to change the FAQ.
dnl ***  (faqprog.pl should be available at:
dnl ***    ftp://ftp.gnupg.org/gcrypt/contrib/faqprog.pl )
dnl *** No need to worry about this warning.
dnl ***]])
dnl     fi
   ])

dnl GNUPG_CHECK_DOCBOOK_TO_TEXI
dnl
AC_DEFUN([GNUPG_CHECK_DOCBOOK_TO_TEXI],
  [
    AC_CHECK_PROG(DOCBOOK_TO_TEXI, docbook2texi, yes, no)
    AC_MSG_CHECKING(for sgml to texi tools)
    working_sgmltotexi=no
    if test "$ac_cv_prog_DOCBOOK_TO_TEXI" = yes; then
      if sgml2xml -v /dev/null 2>&1 | grep 'SP version' >/dev/null 2>&1 ; then
            working_sgmltotexi=yes
      fi
    fi
    AC_MSG_RESULT($working_sgmltotexi)
    AM_CONDITIONAL(HAVE_DOCBOOK_TO_TEXI, test "$working_sgmltotexi" = "yes" )
   ])



dnl GNUPG_CHECK_ENDIAN
dnl define either LITTLE_ENDIAN_HOST or BIG_ENDIAN_HOST
dnl
AC_DEFUN([GNUPG_CHECK_ENDIAN],
  [
    tmp_assumed_endian=big
    tmp_assume_warn=""
    if test "$cross_compiling" = yes; then
      case "$host_cpu" in
         i@<:@345678@:>@* )
            tmp_assumed_endian=little
            ;;
         *)
            ;;
      esac
    fi
    AC_MSG_CHECKING(endianness)
    AC_CACHE_VAL(gnupg_cv_c_endian,
      [ gnupg_cv_c_endian=unknown
        # See if sys/param.h defines the BYTE_ORDER macro.
        AC_TRY_COMPILE([#include <sys/types.h>
        #include <sys/param.h>], [
        #if !BYTE_ORDER || !BIG_ENDIAN || !LITTLE_ENDIAN
         bogus endian macros
        #endif], [# It does; now see whether it defined to BIG_ENDIAN or not.
        AC_TRY_COMPILE([#include <sys/types.h>
        #include <sys/param.h>], [
        #if BYTE_ORDER != BIG_ENDIAN
         not big endian
        #endif], gnupg_cv_c_endian=big, gnupg_cv_c_endian=little)])
        if test "$gnupg_cv_c_endian" = unknown; then
            AC_TRY_RUN([main () {
              /* Are we little or big endian?  From Harbison&Steele.  */
              union
              {
                long l;
                char c[sizeof (long)];
              } u;
              u.l = 1;
              exit (u.c[sizeof (long) - 1] == 1);
              }],
              gnupg_cv_c_endian=little,
              gnupg_cv_c_endian=big,
              gnupg_cv_c_endian=$tmp_assumed_endian
              tmp_assumed_warn=" (assumed)"
            )
        fi
      ])
    AC_MSG_RESULT([${gnupg_cv_c_endian}${tmp_assumed_warn}])
    if test "$gnupg_cv_c_endian" = little; then
      AC_DEFINE(LITTLE_ENDIAN_HOST,1,
                [Defined if the host has little endian byte ordering])
    else
      AC_DEFINE(BIG_ENDIAN_HOST,1,
                [Defined if the host has big endian byte ordering])
    fi
  ])




# GNUPG_BUILD_PROGRAM(NAME,DEFAULT)
# Add a --enable-NAME option to configure an set the
# shell variable build_NAME either to "yes" or "no".  DEFAULT must
# either be "yes" or "no" and decided on the default value for
# build_NAME and whether --enable-NAME or --disable-NAME is shown with
# ./configure --help
AC_DEFUN([GNUPG_BUILD_PROGRAM],
  [m4_define([my_build], [m4_bpatsubst(build_$1, [[^a-zA-Z0-9_]], [_])])
   my_build=$2
   m4_if([$2],[yes],[
      AC_ARG_ENABLE([$1], AC_HELP_STRING([--disable-$1],
                                         [do not build the $1 program]),
                           my_build=$enableval, my_build=$2)
    ],[
      AC_ARG_ENABLE([$1], AC_HELP_STRING([--enable-$1],
                                         [build the $1 program]),
                           my_build=$enableval, my_build=$2)
    ])
   case "$my_build" in
         no|yes)
           ;;
         *)
           AC_MSG_ERROR([only yes or no allowed for feature --enable-$1])
           ;;
   esac
   m4_undefine([my_build])
  ])



# GNUPG_DISABLE_GPG_ALGO(NAME,DESCRIPTION)
#
# Add a --disable-gpg-NAME option and the corresponding ac_define
# GPG_USE_<NAME>.
AC_DEFUN([GNUPG_GPG_DISABLE_ALGO],
  [AC_MSG_CHECKING([whether to enable the $2 for gpg])
   AC_ARG_ENABLE([gpg-$1], AC_HELP_STRING([--disable-gpg-$1],
                                          [disable the $2 algorithm in gpg]),
                                          , enableval=yes)
   AC_MSG_RESULT($enableval)
   if test x"$enableval" = xyes ; then
     AC_DEFINE(GPG_USE_[]m4_toupper($1), 1, [Define to support the $2])
   fi
  ])




# Check whether mlock is broken (hpux 10.20 raises a SIGBUS if mlock
# is not called from uid 0 (not tested whether uid 0 works)
# For DECs Tru64 we have also to check whether mlock is in librt
# mlock is there a macro using memlk()
dnl GNUPG_CHECK_MLOCK
dnl
AC_DEFUN([GNUPG_CHECK_MLOCK],
  [ AC_CHECK_FUNCS(mlock)
    if test "$ac_cv_func_mlock" = "no"; then
        AC_CHECK_HEADERS(sys/mman.h)
        if test "$ac_cv_header_sys_mman_h" = "yes"; then
            # Add librt to LIBS:
            AC_CHECK_LIB(rt, memlk)
            AC_CACHE_CHECK([whether mlock is in sys/mman.h],
                            gnupg_cv_mlock_is_in_sys_mman,
                [AC_TRY_LINK([
                    #include <assert.h>
                    #ifdef HAVE_SYS_MMAN_H
                    #include <sys/mman.h>
                    #endif
                ], [
                    int i;

                    /* glibc defines this for functions which it implements
                     * to always fail with ENOSYS.  Some functions are actually
                     * named something starting with __ and the normal name
                     * is an alias.  */
                    #if defined (__stub_mlock) || defined (__stub___mlock)
                    choke me
                    #else
                    mlock(&i, 4);
                    #endif
                    ; return 0;
                ],
                gnupg_cv_mlock_is_in_sys_mman=yes,
                gnupg_cv_mlock_is_in_sys_mman=no)])
            if test "$gnupg_cv_mlock_is_in_sys_mman" = "yes"; then
                AC_DEFINE(HAVE_MLOCK,1,
                          [Defined if the system supports an mlock() call])
            fi
        fi
    fi
    if test "$ac_cv_func_mlock" = "yes"; then
        AC_MSG_CHECKING(whether mlock is broken)
          AC_CACHE_VAL(gnupg_cv_have_broken_mlock,
             AC_TRY_RUN([
                #include <stdlib.h>
                #include <unistd.h>
                #include <errno.h>
                #include <sys/mman.h>
                #include <sys/types.h>
                #include <fcntl.h>

                int main()
                {
                    char *pool;
                    int err;
                    long int pgsize = getpagesize();

                    pool = malloc( 4096 + pgsize );
                    if( !pool )
                        return 2;
                    pool += (pgsize - ((long int)pool % pgsize));

                    err = mlock( pool, 4096 );
                    if( !err || errno == EPERM )
                        return 0; /* okay */

                    return 1;  /* hmmm */
                }

            ],
            gnupg_cv_have_broken_mlock="no",
            gnupg_cv_have_broken_mlock="yes",
            gnupg_cv_have_broken_mlock="assume-no"
           )
         )
         if test "$gnupg_cv_have_broken_mlock" = "yes"; then
             AC_DEFINE(HAVE_BROKEN_MLOCK,1,
                       [Defined if the mlock() call does not work])
             AC_MSG_RESULT(yes)
             AC_CHECK_FUNCS(plock)
         else
            if test "$gnupg_cv_have_broken_mlock" = "no"; then
                AC_MSG_RESULT(no)
            else
                AC_MSG_RESULT(assuming no)
            fi
         fi
    fi
  ])


dnl Stolen from gcc
dnl Define MKDIR_TAKES_ONE_ARG if mkdir accepts only one argument instead
dnl of the usual 2.
AC_DEFUN([GNUPG_FUNC_MKDIR_TAKES_ONE_ARG],
[AC_CHECK_HEADERS(sys/stat.h unistd.h direct.h)
AC_CACHE_CHECK([if mkdir takes one argument], gnupg_cv_mkdir_takes_one_arg,
[AC_TRY_COMPILE([
#include <sys/types.h>
#ifdef HAVE_SYS_STAT_H
# include <sys/stat.h>
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#ifdef HAVE_DIRECT_H
# include <direct.h>
#endif], [mkdir ("foo", 0);],
        gnupg_cv_mkdir_takes_one_arg=no, gnupg_cv_mkdir_takes_one_arg=yes)])
if test $gnupg_cv_mkdir_takes_one_arg = yes ; then
  AC_DEFINE(MKDIR_TAKES_ONE_ARG,1,
            [Defined if mkdir() does not take permission flags])
fi
])


# GNUPG_TIME_T_UNSIGNED
# Check whether time_t is unsigned
#
AC_DEFUN([GNUPG_TIME_T_UNSIGNED],
  [ AC_CACHE_CHECK(whether time_t is unsigned, gnupg_cv_time_t_unsigned,
     [AC_REQUIRE([AC_HEADER_TIME])dnl
      AC_COMPILE_IFELSE([AC_LANG_BOOL_COMPILE_TRY(
       [AC_INCLUDES_DEFAULT([])
#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
#  include <sys/time.h>
# else
#  include <time.h>
# endif
#endif
],
       [((time_t)-1) < 0])],
       gnupg_cv_time_t_unsigned=no, gnupg_cv_time_t_unsigned=yes)])
    if test $gnupg_cv_time_t_unsigned = yes; then
      AC_DEFINE(HAVE_UNSIGNED_TIME_T,1,[Defined if time_t is an unsigned type])
    fi
])# GNUPG_TIME_T_UNSIGNED