dnl macros to configure g10


dnl GNUPG_MSG_PRINT(STRING)
dnl print a message
dnl
define(GNUPG_MSG_PRINT,
  [ echo $ac_n "$1"" $ac_c" 1>&AC_FD_MSG
  ])


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([#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)
    fi
  ])



dnl GNUPG_LINK_FILES( SRC, DEST )
dnl same as AC_LINK_FILES, but collect the files to link in
dnl some special variables and do the link
dnl when GNUPG_DO_LINK_FILES is called
dnl This is a workaround for AC_LINK_FILES, because it does not work
dnl correct when using a caching scheme
dnl
define(GNUPG_LINK_FILES,
  [ if test "x$wk_link_files_src" = "x"; then
        wk_link_files_src="$1"
        wk_link_files_dst="$2"
    else
        wk_link_files_src="$wk_link_files_src $1"
        wk_link_files_dst="$wk_link_files_dst $2"
    fi
  ])
define(GNUPG_DO_LINK_FILES,
  [ AC_LINK_FILES( $wk_link_files_src, $wk_link_files_dst )
  ])


dnl GNUPG_CHECK_ENDIAN
dnl define either LITTLE_ENDIAN_HOST or BIG_ENDIAN_HOST
dnl
define(GNUPG_CHECK_ENDIAN,
  [ if test "$cross_compiling" = yes; then
        AC_MSG_WARN(cross compiling; assuming little endianess)
    fi
    AC_MSG_CHECKING(endianess)
    AC_CACHE_VAL(gnupg_cv_c_endian,
      [ gnupg_cv_c_endian=unknown
        # See if sys/param.h defines the BYTE_ORDER macro.
        AC_TRY_COMPILE([#include <sys/types.h>
        #include <sys/param.h>], [
        #if !BYTE_ORDER || !BIG_ENDIAN || !LITTLE_ENDIAN
         bogus endian macros
        #endif], [# It does; now see whether it defined to BIG_ENDIAN or not.
        AC_TRY_COMPILE([#include <sys/types.h>
        #include <sys/param.h>], [
        #if BYTE_ORDER != BIG_ENDIAN
         not big endian
        #endif], gnupg_cv_c_endian=big, gnupg_cv_c_endian=little)])
        if test "$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=little
            )
        fi
      ])
    AC_MSG_RESULT([$gnupg_cv_c_endian])
    if test "$gnupg_cv_c_endian" = little; then
      AC_DEFINE(LITTLE_ENDIAN_HOST)
    else
      AC_DEFINE(BIG_ENDIAN_HOST)
    fi
  ])

dnl GNUPG_CHECK_CACHE
dnl
define(GNUPG_CHECK_CACHE,
  [ AC_MSG_CHECKING(cached information)
    gnupg_hostcheck="$target"
    AC_CACHE_VAL(gnupg_cv_hostcheck, [ gnupg_cv_hostcheck="$gnupg_hostcheck" ])
    if test "$gnupg_cv_hostcheck" != "$gnupg_hostcheck"; then
        AC_MSG_RESULT(changed)
        AC_MSG_WARN(config.cache exists!)
        AC_MSG_ERROR(you must do 'make distclean' first to compile for
                 different target or different parameters.)
    else
        AC_MSG_RESULT(ok)
    fi
  ])


######################################################################
# Check for -fPIC etc (taken from libtool)
# This sets CFLAGS_PIC to the required flags
#           NO_PIC to yes if it is not possible to
#                  generate PIC
######################################################################
dnl GNUPG_CHECK_PIC
dnl
define(GNUPG_CHECK_PIC,
  [ AC_MSG_CHECKING(for option to create PIC)
    CFLAGS_PIC=
    NO_PIC=no
    if test "$cross_compiling" = yes; then
        AC_MSG_RESULT(assume none)
    else
        if test "$GCC" = yes; then
            CFLAGS_PIC="-fPIC"
        else
            case "$host_os" in
              aix3* | aix4*)
                # All rs/6000 code is PIC
                # but is there any non-rs/6000 AIX platform?
                ;;

              hpux9* | hpux10*)
                CFLAGS_PIC="+Z"
                ;;

              irix5* | irix6*)
                # PIC (with -KPIC) is the default.
                ;;

              osf3* | osf4*)
                # FIXME - pic_flag is probably required for
                # hppa*-osf* and i860-osf*
                ;;

              sco3.2v5*)
                CFLAGS_PIC='-Kpic'
                ;;

              solaris2* | solaris7* )
                CFLAGS_PIC='-KPIC'
                ;;

              sunos4*)
                CFLAGS_PIC='-PIC'
                ;;

              *)
                NO_PIC=yes
                ;;
            esac
        fi

        case "$host_cpu" in
        rs6000 | powerpc | powerpcle)
          # Yippee! All RS/6000 and PowerPC code is position-independent.
          CFLAGS_PIC=""
          ;;
        esac

        if test "$NO_PIC" = yes; then
            AC_MSG_RESULT(not possible)
        else
            if test -z "$CFLAGS_PIC"; then
               AC_MSG_RESULT(none)
            else
                AC_MSG_RESULT($CFLAGS_PIC)
            fi
        fi
    fi
  ])


######################################################################
# Check for rdynamic flag
# This sets CFLAGS_RDYNAMIC to the required flags
######################################################################
dnl GNUPG_CHECK_RDYNAMIC
dnl
define(GNUPG_CHECK_RDYNAMIC,
  [ AC_MSG_CHECKING(how to specify -rdynamic)
    CFLAGS_RDYNAMIC=
    if test "$cross_compiling" = yes; then
        AC_MSG_RESULT(assume none)
    else
        case "$host_os" in
          solaris* )
            CFLAGS_RDYNAMIC="-Wl,-dy"
            ;;

          freebsd2* | osf4* )
            CFLAGS_RDYNAMIC=""
            ;;
          * )
            CFLAGS_RDYNAMIC="-Wl,-export-dynamic"
            ;;
        esac
        AC_MSG_RESULT($CFLAGS_RDYNAMIC)
    fi
  ])


#####################################################################
# Check for SysV IPC  (from GIMP)
#   And see whether we have a SHM_LOCK (FreeBSD does not have it).
#####################################################################
dnl GNUPG_CHECK_IPC
dnl
define(GNUPG_CHECK_IPC,
   [ AC_CHECK_HEADERS(sys/ipc.h sys/shm.h)
     if test "$ac_cv_header_sys_shm_h" = "yes"; then
       AC_MSG_CHECKING(whether IPC_RMID allowes subsequent attaches)
       AC_CACHE_VAL(gnupg_cv_ipc_rmid_deferred_release,
          AC_TRY_RUN([
             #include <sys/types.h>
             #include <sys/ipc.h>
             #include <sys/shm.h>
             int main()
             {
               int id;
               char *shmaddr;
             id = shmget (IPC_PRIVATE, 4, IPC_CREAT | 0777);
             if (id == -1)
               exit (2);
               shmaddr = shmat (id, 0, 0);
               shmctl (id, IPC_RMID, 0);
               if ((char*) shmat (id, 0, 0) == (char*) -1)
               {
                 shmdt (shmaddr);
                 exit (1);
               }
               shmdt (shmaddr);
               shmdt (shmaddr);
               exit (0);
             }
         ],
         gnupg_cv_ipc_rmid_deferred_release="yes",
         gnupg_cv_ipc_rmid_deferred_release="no",
         gnupg_cv_ipc_rmid_deferred_release="assume-no")
       )
       if test "$gnupg_cv_ipc_rmid_deferred_release" = "yes"; then
           AC_DEFINE(IPC_RMID_DEFERRED_RELEASE)
           AC_MSG_RESULT(yes)
       else
          if test "$gnupg_cv_ipc_rmid_deferred_release" = "no"; then
              AC_MSG_RESULT(no)
          else
              AC_MSG_RESULT([assuming no])
          fi
       fi

       AC_MSG_CHECKING(whether SHM_LOCK is available)
       AC_CACHE_VAL(gnupg_cv_ipc_have_shm_lock,
          AC_TRY_COMPILE([#include <sys/types.h>
             #include <sys/ipc.h>
             #include <sys/shm.h>],[
             int foo( int shm_id ) {  shmctl(shm_id, SHM_LOCK, 0); }
             ],
             gnupg_cv_ipc_have_shm_lock="yes",
             gnupg_cv_ipc_have_shm_lock="no"
          )
       )
       if test "$gnupg_cv_ipc_have_shm_lock" = "yes"; then
         AC_DEFINE(IPC_HAVE_SHM_LOCK)
         AC_MSG_RESULT(yes)
       else
         AC_MSG_RESULT(no)
       fi
     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)
######################################################################
dnl GNUPG_CHECK_MLOCK
dnl
define(GNUPG_CHECK_MLOCK,
  [ AC_CHECK_FUNCS(mlock)
    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 "$gnupg_cv_have_broken_mlock" = "yes"; then
             AC_DEFINE(HAVE_BROKEN_MLOCK)
             AC_MSG_RESULT(yes)
         else
            if test "$gnupg_cv_have_broken_mlock" = "no"; then
                AC_MSG_RESULT(no)
            else
                AC_MSG_RESULT(assuming no)
            fi
         fi
    fi
  ])


dnl *-*wedit:notab*-*  Please keep this as the last line.