dnl  MPFR specific autoconf macros

dnl  Copyright 2000, 2002-2017 Free Software Foundation, Inc.

dnl  Contributed by the AriC and Caramba projects, INRIA.

dnl

dnl  This file is part of the GNU MPFR Library.

dnl

dnl  The GNU MPFR Library is free software; you can redistribute it and/or modify

dnl  it under the terms of the GNU Lesser General Public License as published

dnl  by the Free Software Foundation; either version 3 of the License, or (at

dnl  your option) any later version.

dnl

dnl  The GNU MPFR Library is distributed in the hope that it will be useful, but

dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY

dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public

dnl  License for more details.

dnl

dnl  You should have received a copy of the GNU Lesser General Public License

dnl  along with the GNU MPFR Library; see the file COPYING.LESSER.  If not, see

dnl  http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,

dnl  51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.

dnl  autoconf 2.60 is necessary because of the use of AC_PROG_SED.

dnl  The following line allows the autoconf wrapper (when installed)

dnl  to work as expected.

dnl  If you change the required version, please update README.dev too!

AC_PREREQ(2.60)

dnl ------------------------------------------------------------

dnl You must put in MPFR_CONFIGS everything which configure MPFR

dnl except:

dnl   - Everything dealing with CC and CFLAGS in particular the ABI

dnl     but the IEEE-754 specific flags must be set here.

dnl   - Tests that depend on gmp.h (see MPFR_CHECK_DBL2INT_BUG as an example:

dnl     a function needs to be defined and called in configure.ac).

dnl   - GMP's linkage.

dnl   - Libtool stuff.

dnl   - Handling of special arguments of MPFR's configure.

AC_DEFUN([MPFR_CONFIGS],

[

AC_REQUIRE([AC_OBJEXT])

AC_REQUIRE([MPFR_CHECK_LIBM])

AC_REQUIRE([AC_HEADER_TIME])

AC_REQUIRE([AC_CANONICAL_HOST])

AC_CHECK_HEADER([limits.h],, AC_MSG_ERROR([limits.h not found]))

AC_CHECK_HEADER([float.h],,  AC_MSG_ERROR([float.h not found]))

AC_CHECK_HEADER([string.h],, AC_MSG_ERROR([string.h not found]))

dnl Check for locales

AC_CHECK_HEADERS([locale.h])

dnl Check for wide characters (wchar_t and wint_t)

AC_CHECK_HEADERS([wchar.h])

dnl Check for stdargs

AC_CHECK_HEADER([stdarg.h],[AC_DEFINE([HAVE_STDARG],1,[Define if stdarg])],

  [AC_CHECK_HEADER([varargs.h],,

    AC_MSG_ERROR([stdarg.h or varargs.h not found]))])

dnl sys/fpu.h - MIPS specific

AC_CHECK_HEADERS([sys/time.h sys/fpu.h])

dnl Android has a <locale.h>, but not the following members.

AC_CHECK_MEMBERS([struct lconv.decimal_point, struct lconv.thousands_sep],,,

  [#include <locale.h>])

dnl Check how to get `alloca'

AC_FUNC_ALLOCA

dnl SIZE_MAX macro

gl_SIZE_MAX

dnl va_copy macro

AC_MSG_CHECKING([how to copy va_list])

AC_LINK_IFELSE([AC_LANG_PROGRAM([[

#include <stdarg.h>

]], [[

   va_list ap1, ap2;

   va_copy(ap1, ap2);

]])], [

   AC_MSG_RESULT([va_copy])

   AC_DEFINE(HAVE_VA_COPY)

], [AC_LINK_IFELSE([AC_LANG_PROGRAM([[

#include <stdarg.h>

]], [[

   va_list ap1, ap2;

   __va_copy(ap1, ap2);

]])], [AC_DEFINE([HAVE___VA_COPY]) AC_MSG_RESULT([__va_copy])],

   [AC_MSG_RESULT([memcpy])])])

dnl FIXME: The functions memmove, memset and strtol are really needed by

dnl MPFR, but if they are implemented as macros, this is also OK (in our

dnl case).  So, we do not return an error, but their tests are currently

dnl useless.

dnl gettimeofday is not defined for MinGW

AC_CHECK_FUNCS([memmove memset setlocale strtol gettimeofday])

dnl Check for IEEE-754 switches on Alpha

case $host in

alpha*-*-*)

  saved_CFLAGS="$CFLAGS"

  AC_CACHE_CHECK([for IEEE-754 switches], mpfr_cv_ieee_switches, [

  if test -n "$GCC"; then

    mpfr_cv_ieee_switches="-mfp-rounding-mode=d -mieee-with-inexact"

  else

    mpfr_cv_ieee_switches="-fprm d -ieee_with_inexact"

  fi

  CFLAGS="$CFLAGS $mpfr_cv_ieee_switches"

  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[]])], , mpfr_cv_ieee_switches="none")

  ])

  if test "$mpfr_cv_ieee_switches" = "none"; then

    CFLAGS="$saved_CFLAGS"

  else

    CFLAGS="$saved_CFLAGS $mpfr_cv_ieee_switches"

  fi

esac

dnl check for long long

AC_CHECK_TYPE([long long int],

   AC_DEFINE(HAVE_LONG_LONG, 1, [Define if compiler supports long long]),,)

dnl intmax_t is C99

AC_CHECK_TYPES([intmax_t])

if test "$ac_cv_type_intmax_t" = yes; then

  AC_CACHE_CHECK([for working INTMAX_MAX], mpfr_cv_have_intmax_max, [

    saved_CPPFLAGS="$CPPFLAGS"

    CPPFLAGS="$CPPFLAGS -I$srcdir/src"

    AC_COMPILE_IFELSE([AC_LANG_PROGRAM(

        [[#include "mpfr-intmax.h"]],

        [[intmax_t x = INTMAX_MAX; (void) x;]]

      )],

      mpfr_cv_have_intmax_max=yes, mpfr_cv_have_intmax_max=no)

    CPPFLAGS="$saved_CPPFLAGS"

  ])

  if test "$mpfr_cv_have_intmax_max" = "yes"; then

    AC_DEFINE(MPFR_HAVE_INTMAX_MAX,1,[Define if you have a working INTMAX_MAX.])

  fi

fi

AC_CHECK_TYPE( [union fpc_csr],

   AC_DEFINE(HAVE_FPC_CSR,1,[Define if union fpc_csr is available]), ,

[

#if HAVE_SYS_FPU_H

#  include <sys/fpu.h>

#endif

])

dnl Check for fesetround

AC_CACHE_CHECK([for fesetround], mpfr_cv_have_fesetround, [

saved_LIBS="$LIBS"

LIBS="$LIBS $MPFR_LIBM"

AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <fenv.h>]], [[fesetround(FE_TONEAREST);]])],

  mpfr_cv_have_fesetround=yes, mpfr_cv_have_fesetround=no)

LIBS="$saved_LIBS"

])

if test "$mpfr_cv_have_fesetround" = "yes"; then

  AC_DEFINE(MPFR_HAVE_FESETROUND,1,[Define if you have the `fesetround' function via the <fenv.h> header file.])

fi

dnl Check for gcc float-conversion bug; if need be, -ffloat-store is used to

dnl force the conversion to the destination type when a value is stored to

dnl a variable (see ISO C99 standard 5.1.2.3#13, 6.3.1.5#2, 6.3.1.8#2). This

dnl is important concerning the exponent range. Note that this doesn't solve

dnl the double-rounding problem.

if test -n "$GCC"; then

  AC_CACHE_CHECK([for gcc float-conversion bug], mpfr_cv_gcc_floatconv_bug, [

  saved_LIBS="$LIBS"

  LIBS="$LIBS $MPFR_LIBM"

  AC_RUN_IFELSE([AC_LANG_SOURCE([[

#include <float.h>

#ifdef MPFR_HAVE_FESETROUND

#include <fenv.h>

#endif

static double get_max (void);

int main (void) {

  double x = 0.5;

  double y;

  int i;

  for (i = 1; i <= 11; i++)

    x *= x;

  if (x != 0)

    return 1;

#ifdef MPFR_HAVE_FESETROUND

  /* Useful test for the G4 PowerPC */

  fesetround(FE_TOWARDZERO);

  x = y = get_max ();

  x *= 2.0;

  if (x != y)

    return 1;

#endif

  return 0;

}

static double get_max (void) { static volatile double d = DBL_MAX; return d; }

  ]])],

     [mpfr_cv_gcc_floatconv_bug="no"],

     [mpfr_cv_gcc_floatconv_bug="yes, use -ffloat-store"],

     [mpfr_cv_gcc_floatconv_bug="cannot test, use -ffloat-store"])

  LIBS="$saved_LIBS"

  ])

  if test "$mpfr_cv_gcc_floatconv_bug" != "no"; then

    CFLAGS="$CFLAGS -ffloat-store"

  fi

fi

dnl Check if subnormal (denormalized) numbers are supported

AC_CACHE_CHECK([for subnormal numbers], mpfr_cv_have_denorms, [

AC_RUN_IFELSE([AC_LANG_SOURCE([[

#include <stdio.h>

int main (void) {

  double x = 2.22507385850720138309e-308;

  fprintf (stderr, "%e\n", x / 2.0);

  return 2.0 * (x / 2.0) != x;

}

]])],

   [mpfr_cv_have_denorms="yes"],

   [mpfr_cv_have_denorms="no"],

   [mpfr_cv_have_denorms="cannot test, assume no"])

])

if test "$mpfr_cv_have_denorms" = "yes"; then

  AC_DEFINE(HAVE_DENORMS,1,[Define if subnormal (denormalized) floats work.])

fi

dnl Check if signed zeros are supported. Note: the test will fail

dnl if the division by 0 generates a trap.

AC_CACHE_CHECK([for signed zeros], mpfr_cv_have_signedz, [

AC_RUN_IFELSE([AC_LANG_SOURCE([[

int main (void) {

  return 1.0 / 0.0 == 1.0 / -0.0;

}

]])],

   [mpfr_cv_have_signedz="yes"],

   [mpfr_cv_have_signedz="no"],

   [mpfr_cv_have_signedz="cannot test, assume no"])

])

if test "$mpfr_cv_have_signedz" = "yes"; then

  AC_DEFINE(HAVE_SIGNEDZ,1,[Define if signed zeros are supported.])

fi

dnl Check the FP division by 0 fails (e.g. on a non-IEEE-754 platform).

dnl In such a case, MPFR_ERRDIVZERO is defined to disable the tests

dnl involving a FP division by 0.

dnl For the developers: to check whether all these tests are disabled,

dnl configure MPFR with "-DMPFR_TEST_DIVBYZERO=1 -DMPFR_ERRDIVZERO=1".

AC_CACHE_CHECK([if the FP division by 0 fails], mpfr_cv_errdivzero, [

AC_RUN_IFELSE([AC_LANG_SOURCE([[

int main (void) {

  volatile double d = 0.0, x;

  x = 0.0 / d;

  x = 1.0 / d;

  (void) x;

  return 0;

}

]])],

   [mpfr_cv_errdivzero="no"],

   [mpfr_cv_errdivzero="yes"],

   [mpfr_cv_errdivzero="cannot test, assume no"])

])

if test "$mpfr_cv_errdivzero" = "yes"; then

  AC_DEFINE(MPFR_ERRDIVZERO,1,[Define if the FP division by 0 fails.])

  AC_MSG_WARN([The floating-point division by 0 fails instead of])

  AC_MSG_WARN([returning a special value: NaN or infinity. Tests])

  AC_MSG_WARN([involving a FP division by 0 will be disabled.])

fi

dnl Check whether NAN != NAN (as required by the IEEE-754 standard,

dnl but not by the ISO C standard). For instance, this is false with

dnl MIPSpro 7.3.1.3m under IRIX64. By default, assume this is true.

AC_CACHE_CHECK([if NAN == NAN], mpfr_cv_nanisnan, [

AC_RUN_IFELSE([AC_LANG_SOURCE([[

#include <stdio.h>

#include <math.h>

#ifndef NAN

# define NAN (0.0/0.0)

#endif

int main (void) {

  double d;

  d = NAN;

  return d != d;

}

]])],

   [mpfr_cv_nanisnan="yes"],

   [mpfr_cv_nanisnan="no"],

   [mpfr_cv_nanisnan="cannot test, assume no"])

])

if test "$mpfr_cv_nanisnan" = "yes"; then

  AC_DEFINE(MPFR_NANISNAN,1,[Define if NAN == NAN.])

  AC_MSG_WARN([The test NAN != NAN is false. The probable reason is that])

  AC_MSG_WARN([your compiler optimizes floating-point expressions in an])

  AC_MSG_WARN([unsafe way because some option, such as -ffast-math or])

  AC_MSG_WARN([-fast (depending on the compiler), has been used.  You])

  AC_MSG_WARN([should NOT use such an option, otherwise MPFR functions])

  AC_MSG_WARN([such as mpfr_get_d and mpfr_set_d may return incorrect])

  AC_MSG_WARN([results on special FP numbers (e.g. NaN or signed zeros).])

  AC_MSG_WARN([If you did not use such an option, please send us a bug])

  AC_MSG_WARN([report so that we can try to find a workaround for your])

  AC_MSG_WARN([platform and/or document the behavior.])

fi

dnl Check if the chars '0' to '9' are consecutive values

AC_MSG_CHECKING([if charset has consecutive values])

AC_RUN_IFELSE([AC_LANG_PROGRAM([[

char *number = "0123456789";

char *lower  = "abcdefghijklmnopqrstuvwxyz";

char *upper  = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

]],[[

 int i;

 unsigned char *p;

 for (p = (unsigned char*) number, i = 0; i < 9; i++)

   if ( (*p)+1 != *(p+1) ) return 1;

 for (p = (unsigned char*) lower, i = 0; i < 25; i++)

   if ( (*p)+1 != *(p+1) ) return 1;

 for (p = (unsigned char*) upper, i = 0; i < 25; i++)

   if ( (*p)+1 != *(p+1) ) return 1;

]])], [AC_MSG_RESULT(yes)],[

 AC_MSG_RESULT(no)

 AC_DEFINE(MPFR_NO_CONSECUTIVE_CHARSET,1,[Charset is not consecutive])

], [AC_MSG_RESULT(cannot test)])

dnl Must be checked with the LIBM

dnl but we don't want to add the LIBM to MPFR dependency.

dnl Can't use AC_CHECK_FUNCS since the function may be in LIBM but

dnl not exported in math.h

saved_LIBS="$LIBS"

LIBS="$LIBS $MPFR_LIBM"

dnl AC_CHECK_FUNCS([round trunc floor ceil nearbyint])

AC_MSG_CHECKING(for math/round)

AC_LINK_IFELSE([AC_LANG_PROGRAM([[

#include <math.h>

static int f (double (*func)(double)) { return 0; }

]], [[

 return f(round);

]])], [

   AC_MSG_RESULT(yes)

   AC_DEFINE(HAVE_ROUND, 1,[Have ISO C99 round function])

],[AC_MSG_RESULT(no)])

AC_MSG_CHECKING(for math/trunc)

AC_LINK_IFELSE([AC_LANG_PROGRAM([[

#include <math.h>

static int f (double (*func)(double)) { return 0; }

]], [[

 return f(trunc);

]])], [

   AC_MSG_RESULT(yes)

   AC_DEFINE(HAVE_TRUNC, 1,[Have ISO C99 trunc function])

],[AC_MSG_RESULT(no)])

AC_MSG_CHECKING(for math/floor)

AC_LINK_IFELSE([AC_LANG_PROGRAM([[

#include <math.h>

static int f (double (*func)(double)) { return 0; }

]], [[

 return f(floor);

]])], [

   AC_MSG_RESULT(yes)

   AC_DEFINE(HAVE_FLOOR, 1,[Have ISO C99 floor function])

],[AC_MSG_RESULT(no)])

AC_MSG_CHECKING(for math/ceil)

AC_LINK_IFELSE([AC_LANG_PROGRAM([[

#include <math.h>

static int f (double (*func)(double)) { return 0; }

]], [[

 return f(ceil);

]])], [

   AC_MSG_RESULT(yes)

   AC_DEFINE(HAVE_CEIL, 1,[Have ISO C99 ceil function])

],[AC_MSG_RESULT(no)])

AC_MSG_CHECKING(for math/nearbyint)

AC_LINK_IFELSE([AC_LANG_PROGRAM([[

#include <math.h>

static int f (double (*func)(double)) { return 0; }

]], [[

 return f(nearbyint);

]])], [

   AC_MSG_RESULT(yes)

   AC_DEFINE(HAVE_NEARBYINT, 1,[Have ISO C99 nearbyint function])

],[AC_MSG_RESULT(no)])

LIBS="$saved_LIBS"

dnl Now try to check the long double format

MPFR_C_LONG_DOUBLE_FORMAT

if test "$enable_logging" = yes; then

  if test "$enable_thread_safe" = yes; then

    AC_MSG_ERROR([Enable either `Logging' or `thread-safe', not both])

  else

    enable_thread_safe=no

  fi

fi

dnl Check if thread-local variables are supported.

dnl At least two problems can occur in practice:

dnl 1. The compilation fails, e.g. because the compiler doesn't know

dnl    about the __thread keyword.

dnl 2. The compilation succeeds, but the system doesn't support TLS or

dnl    there is some ld configuration problem. One of the effects can

dnl    be that thread-local variables always evaluate to 0. So, it is

dnl    important to run the test below.

if test "$enable_thread_safe" != no; then

AC_MSG_CHECKING(for TLS support using C11)

saved_CPPFLAGS="$CPPFLAGS"

CPPFLAGS="$CPPFLAGS -I$srcdir/src"

AC_RUN_IFELSE([AC_LANG_SOURCE([[

#define MPFR_USE_THREAD_SAFE 1

#define MPFR_USE_C11_THREAD_SAFE 1

#include "mpfr-thread.h"

MPFR_THREAD_ATTR int x = 17;

int main (void) {

  return x != 17;

}

  ]])],

     [AC_MSG_RESULT(yes)

      AC_DEFINE([MPFR_USE_THREAD_SAFE],1,[Build MPFR as thread safe])

      AC_DEFINE([MPFR_USE_C11_THREAD_SAFE],1,[Build MPFR as thread safe using C11])

      tls_c11_support=yes

     ],

     [AC_MSG_RESULT(no)

     ],

     [AC_MSG_RESULT([cannot test, assume no])

     ])

CPPFLAGS="$saved_CPPFLAGS"

if test "$tls_c11_support" != "yes"

then

 AC_MSG_CHECKING(for TLS support)

 saved_CPPFLAGS="$CPPFLAGS"

 CPPFLAGS="$CPPFLAGS -I$srcdir/src"

 AC_RUN_IFELSE([AC_LANG_SOURCE([[

 #define MPFR_USE_THREAD_SAFE 1

 #include "mpfr-thread.h"

 MPFR_THREAD_ATTR int x = 17;

 int main (void) {

   return x != 17;

 }

   ]])],

      [AC_MSG_RESULT(yes)

       AC_DEFINE([MPFR_USE_THREAD_SAFE],1,[Build MPFR as thread safe])

      ],

      [AC_MSG_RESULT(no)

       if test "$enable_thread_safe" = yes; then

         AC_MSG_ERROR([please configure with --disable-thread-safe])

       fi

      ],

      [if test "$enable_thread_safe" = yes; then

         AC_MSG_RESULT([cannot test, assume yes])

         AC_DEFINE([MPFR_USE_THREAD_SAFE],1,[Build MPFR as thread safe])

       else

         AC_MSG_RESULT([cannot test, assume no])

       fi

      ])

 CPPFLAGS="$saved_CPPFLAGS"

 fi

fi

])

dnl end of MPFR_CONFIGS

dnl MPFR_CHECK_GMP

dnl --------------

dnl Check GMP library vs header. Useful if the user provides --with-gmp

dnl with a directory containing a GMP version that doesn't have the

dnl correct ABI: the previous tests won't trigger the error if the same

dnl GMP version with the right ABI is installed on the system, as this

dnl library is automatically selected by the linker, while the header

dnl (which depends on the ABI) of the --with-gmp include directory is

dnl used.

dnl Note: if the error is changed to a warning due to that fact that

dnl libtool is not used, then the same thing should be done for the

dnl other tests based on GMP.

AC_DEFUN([MPFR_CHECK_GMP], [

AC_REQUIRE([MPFR_CONFIGS])dnl

AC_CACHE_CHECK([for GMP library vs header correctness], mpfr_cv_check_gmp, [

AC_RUN_IFELSE([AC_LANG_PROGRAM([[

#include <stdio.h>

#include <limits.h>

#include <gmp.h>

]], [[

  fprintf (stderr, "GMP_NAIL_BITS     = %d\n", (int) GMP_NAIL_BITS);

  fprintf (stderr, "GMP_NUMB_BITS     = %d\n", (int) GMP_NUMB_BITS);

  fprintf (stderr, "mp_bits_per_limb  = %d\n", (int) mp_bits_per_limb);

  fprintf (stderr, "sizeof(mp_limb_t) = %d\n", (int) sizeof(mp_limb_t));

  if (GMP_NAIL_BITS != 0)

    {

      fprintf (stderr, "GMP_NAIL_BITS != 0\n");

      return 1;

    }

  if (GMP_NUMB_BITS != mp_bits_per_limb)

    {

      fprintf (stderr, "GMP_NUMB_BITS != mp_bits_per_limb\n");

      return 2;

    }

  if (GMP_NUMB_BITS != sizeof(mp_limb_t) * CHAR_BIT)

    {

      fprintf (stderr, "GMP_NUMB_BITS != sizeof(mp_limb_t) * CHAR_BIT\n");

      return 3;

    }

  return 0;

]])], [mpfr_cv_check_gmp="yes"],

      [mpfr_cv_check_gmp="no (exit status is $?)"],

      [mpfr_cv_check_gmp="cannot test, assume yes"])

])

case $mpfr_cv_check_gmp in

no*)

  AC_MSG_ERROR([bad GMP library or header - ABI problem?

See 'config.log' for details.])

esac

])

dnl MPFR_CHECK_DBL2INT_BUG

dnl ----------------------

dnl Check for double-to-integer conversion bug

dnl https://gforge.inria.fr/tracker/index.php?func=detail&aid=14435

dnl For the exit status, the lowest values (including some values after 128)

dnl are reserved for various system errors. So, let's use the largest values

dnl below 255 for errors in the test itself.

dnl The following problem has been seen under Solaris in config.log,

dnl i.e. the failure to link with libgmp wasn't detected in the first

dnl test:

dnl   configure: checking if gmp.h version and libgmp version are the same

dnl   configure: gcc -o conftest -Wall -Wmissing-prototypes [...]

dnl   configure: $? = 0

dnl   configure: ./conftest

dnl   ld.so.1: conftest: fatal: libgmp.so.10: open failed: No such file [...]

dnl   configure: $? = 0

dnl   configure: result: yes

dnl   configure: checking for double-to-integer conversion bug

dnl   configure: gcc -o conftest -Wall -Wmissing-prototypes [...]

dnl   configure: $? = 0

dnl   configure: ./conftest

dnl   ld.so.1: conftest: fatal: libgmp.so.10: open failed: No such file [...]

dnl   ./configure[1680]: eval: line 1: 1971: Killed

dnl   configure: $? = 9

dnl   configure: program exited with status 9

AC_DEFUN([MPFR_CHECK_DBL2INT_BUG], [

AC_REQUIRE([MPFR_CONFIGS])dnl

AC_CACHE_CHECK([for double-to-integer conversion bug], mpfr_cv_dbl_int_bug, [

AC_RUN_IFELSE([AC_LANG_PROGRAM([[

#include <gmp.h>

]], [[

  double d;

  mp_limb_t u;

  int i;

  d = 1.0;

  for (i = 0; i < GMP_NUMB_BITS - 1; i++)

    d = d + d;

  u = (mp_limb_t) d;

  for (; i > 0; i--)

    {

      if (u & 1)

        break;

      u = u >> 1;

    }

  return (i == 0 && u == 1UL) ? 0 : 254 - i;

]])], [mpfr_cv_dbl_int_bug="no"],

      [mpfr_cv_dbl_int_bug="yes or failed to exec (exit status is $?)"],

      [mpfr_cv_dbl_int_bug="cannot test, assume not present"])

])

case $mpfr_cv_dbl_int_bug in

yes*)

  AC_MSG_ERROR([double-to-integer conversion is incorrect.

You need to use another compiler (or lower the optimization level).])

esac

])

dnl MPFR_PARSE_DIRECTORY

dnl Input:  $1 = a string to a relative or absolute directory

dnl Output: $2 = the variable to set with the absolute directory

AC_DEFUN([MPFR_PARSE_DIRECTORY],

[

 dnl Check if argument is a directory

 if test -d $1 ; then

    dnl Get the absolute path of the directory

    dnl in case of relative directory.

    dnl If realpath is not a valid command,

    dnl an error is produced and we keep the given path.

    local_tmp=`realpath $1 2>/dev/null`

    if test "$local_tmp" != "" ; then

       if test -d "$local_tmp" ; then

           $2="$local_tmp"

       else

           $2=$1

       fi

    else

       $2=$1

    fi

    dnl Check for space in the directory

    if test `echo $1|cut -d' ' -f1` != $1 ; then

        AC_MSG_ERROR($1 directory shall not contain any space.)

    fi

 else

    AC_MSG_ERROR($1 shall be a valid directory)

 fi

])

dnl  MPFR_C_LONG_DOUBLE_FORMAT

dnl  -------------------------

dnl  Determine the format of a long double.

dnl

dnl  The object file is grepped, so as to work when cross compiling.  A

dnl  start and end sequence is included to avoid false matches, and

dnl  allowance is made for the desired data crossing an "od -b" line

dnl  boundary.  The test number is a small integer so it should appear

dnl  exactly, no rounding or truncation etc.

dnl

dnl  "od -b" is supported even by Unix V7, and the awk script used doesn't

dnl  have functions or anything, so even an "old" awk should suffice.

dnl

dnl  The 10-byte IEEE extended format is generally padded to either 12 or 16

dnl  bytes for alignment purposes.  The SVR4 i386 ABI is 12 bytes, or i386

dnl  gcc -m128bit-long-double selects 16 bytes.  IA-64 is 16 bytes in LP64

dnl  mode, or 12 bytes in ILP32 mode.  The first 10 bytes is the relevant

dnl  part in all cases (big and little endian).

dnl

dnl  Enhancements:

dnl

dnl  Could match more formats, but no need to worry until there's code

dnl  wanting to use them.

dnl

dnl  Don't want to duplicate the double matching from GMP_C_DOUBLE_FORMAT,

dnl  perhaps we should merge with that macro, to match data formats

dnl  irrespective of the C type in question.  Or perhaps just let the code

dnl  use DOUBLE macros when sizeof(double)==sizeof(long double).

AC_DEFUN([MPFR_C_LONG_DOUBLE_FORMAT],

[AC_REQUIRE([AC_PROG_CC])

AC_REQUIRE([AC_PROG_AWK])

AC_REQUIRE([AC_OBJEXT])

AC_CHECK_TYPES([long double])

AC_CACHE_CHECK([format of `long double' floating point],

                mpfr_cv_c_long_double_format,

[mpfr_cv_c_long_double_format=unknown

if test "$ac_cv_type_long_double" != yes; then

  mpfr_cv_c_long_double_format="not available"

else

  cat >conftest.c <<\EOF

[

/* "before" is 16 bytes to ensure there's no padding between it and "x".

   We're not expecting any "long double" bigger than 16 bytes or with

   alignment requirements stricter than 16 bytes.  */

struct {

  char         before[16];

  long double  x;

  char         after[8];

} foo = {

  { '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0',

    '\001', '\043', '\105', '\147', '\211', '\253', '\315', '\357' },

  -123456789.0,

  { '\376', '\334', '\272', '\230', '\166', '\124', '\062', '\020' }

};

]

EOF

  mpfr_compile="$CC $CFLAGS $CPPFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD 2>&1"

  if AC_TRY_EVAL(mpfr_compile); then

    cat >conftest.awk <<\EOF

[

BEGIN {

  found = 0

}

# got[] holds a sliding window of bytes read the input.  got[0] is the most

# recent byte read, and got[31] the oldest byte read, so when looking to

# match some data the indices are "reversed".

#

{

  for (f = 2; f <= NF; f++)

    {

      # new byte, shift others up

      for (i = 31; i >= 0; i--)

        got[i+1] = got[i];

      got[0] = $f;

      # end sequence

      if (got[7] != "376") continue

      if (got[6] != "334") continue

      if (got[5] != "272") continue

      if (got[4] != "230") continue

      if (got[3] != "166") continue

      if (got[2] != "124") continue

      if (got[1] != "062") continue

      if (got[0] != "020") continue

      # start sequence, with 8-byte body

      if (got[23] == "001" && \

          got[22] == "043" && \

          got[21] == "105" && \

          got[20] == "147" && \

          got[19] == "211" && \

          got[18] == "253" && \

          got[17] == "315" && \

          got[16] == "357")

        {

          saw = " (" got[15] \

                 " " got[14] \

                 " " got[13] \

                 " " got[12] \

                 " " got[11] \

                 " " got[10] \

                 " " got[9]  \

                 " " got[8] ")"

          if (got[15] == "301" && \

              got[14] == "235" && \

              got[13] == "157" && \

              got[12] == "064" && \

              got[11] == "124" && \

              got[10] == "000" && \

              got[9] ==  "000" && \

              got[8] ==  "000")

            {

              print "IEEE double, big endian"

              found = 1

              exit

            }

          if (got[15] == "000" && \

              got[14] == "000" && \

              got[13] == "000" && \

              got[12] == "124" && \

              got[11] == "064" && \

              got[10] == "157" && \

              got[9] ==  "235" && \

              got[8] ==  "301")

            {

              print "IEEE double, little endian"

              found = 1

              exit

            }

        }

      # start sequence, with 12-byte body

      if (got[27] == "001" && \

          got[26] == "043" && \

          got[25] == "105" && \

          got[24] == "147" && \

          got[23] == "211" && \

          got[22] == "253" && \

          got[21] == "315" && \

          got[20] == "357")

        {

          saw = " (" got[19] \

                 " " got[18] \

                 " " got[17] \

                 " " got[16] \

                 " " got[15] \

                 " " got[14] \

                 " " got[13] \

                 " " got[12] \

                 " " got[11] \

                 " " got[10] \

                 " " got[9]  \

                 " " got[8] ")"

          if (got[19] == "000" && \

              got[18] == "000" && \

              got[17] == "000" && \

              got[16] == "000" && \

              got[15] == "240" && \

              got[14] == "242" && \

              got[13] == "171" && \

              got[12] == "353" && \

              got[11] == "031" && \

              got[10] == "300")

            {

              print "IEEE extended, little endian"

              found = 1

              exit

            }

          if (got[19] == "300" && \

              got[18] == "031" && \

              got[17] == "000" && \

              got[16] == "000" && \

              got[15] == "353" && \

              got[14] == "171" && \

              got[13] == "242" && \

              got[12] == "240" && \

              got[11] == "000" && \

              got[10] == "000" && \

              got[09] == "000" && \

              got[08] == "000")

            {

              # format found on m68k

              print "IEEE extended, big endian"

              found = 1

              exit

            }

        }

      # start sequence, with 16-byte body

      if (got[31] == "001" && \

          got[30] == "043" && \

          got[29] == "105" && \

          got[28] == "147" && \

          got[27] == "211" && \

          got[26] == "253" && \

          got[25] == "315" && \

          got[24] == "357")

        {

          saw = " (" got[23] \

                 " " got[22] \

                 " " got[21] \

                 " " got[20] \

                 " " got[19] \

                 " " got[18] \

                 " " got[17] \

                 " " got[16] \

                 " " got[15] \

                 " " got[14] \

                 " " got[13] \

                 " " got[12] \

                 " " got[11] \

                 " " got[10] \

                 " " got[9]  \

                 " " got[8] ")"

          if (got[23] == "000" && \

              got[22] == "000" && \

              got[21] == "000" && \

              got[20] == "000" && \

              got[19] == "240" && \

              got[18] == "242" && \

              got[17] == "171" && \

              got[16] == "353" && \

              got[15] == "031" && \

              got[14] == "300")

            {

              print "IEEE extended, little endian"

              found = 1

              exit

            }

          if (got[23] == "300" && \

              got[22] == "031" && \

              got[21] == "326" && \

              got[20] == "363" && \

              got[19] == "105" && \

              got[18] == "100" && \

              got[17] == "000" && \

              got[16] == "000" && \

              got[15] == "000" && \

              got[14] == "000" && \

              got[13] == "000" && \

              got[12] == "000" && \

              got[11] == "000" && \

              got[10] == "000" && \

              got[9]  == "000" && \

              got[8]  == "000")

            {

              # format used on HP 9000/785 under HP-UX

              print "IEEE quad, big endian"

              found = 1

              exit

            }

          if (got[23] == "000" && \

              got[22] == "000" && \

              got[21] == "000" && \

              got[20] == "000" && \

              got[19] == "000" && \

              got[18] == "000" && \

              got[17] == "000" && \

              got[16] == "000" && \

              got[15] == "000" && \

              got[14] == "000" && \

              got[13] == "100" && \

              got[12] == "105" && \

              got[11] == "363" && \

              got[10] == "326" && \

              got[9]  == "031" && \

	      got[8]  == "300")

            {

              print "IEEE quad, little endian"