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acinclude.m4
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acinclude.m4
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dnl MPFR specific autoconf macros
dnl Copyright 2000, 2002-2020 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 https://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 that configures MPFR 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([MPFR_CHECK_LIBQUADMATH])
AC_REQUIRE([AC_HEADER_TIME])
AC_REQUIRE([AC_CANONICAL_HOST])
dnl Features for the MPFR shared cache. This needs to be done
dnl quite early since this may change CC, CFLAGS and LIBS, which
dnl may affect the other tests.
if test "$enable_shared_cache" = yes; then
dnl Prefer ISO C11 threads (as in mpfr-thread.h).
MPFR_CHECK_C11_THREAD()
if test "$mpfr_c11_thread_ok" != yes; then
dnl Check for POSIX threads. Since the AX_PTHREAD macro is not standard
dnl (it is provided by autoconf-archive), we need to detect whether it
dnl is left unexpanded, otherwise the configure script won't fail and
dnl "make distcheck" won't give any error, yielding buggy tarballs!
dnl The \b is necessary to avoid an error with recent ax_pthread.m4
dnl (such as with Debian's autoconf-archive 20160320-1), which contains
dnl AX_PTHREAD_ZOS_MISSING, etc. It is not documented, but see:
dnl https://lists.gnu.org/archive/html/autoconf/2015-03/msg00011.html
dnl
dnl Note: each time a change is done in m4_pattern_forbid, autogen.sh
dnl should be tested with and without ax_pthread.m4 availability (in
dnl the latter case, there should be an error).
m4_pattern_forbid([AX_PTHREAD\b])
AX_PTHREAD([])
if test "$ax_pthread_ok" = yes; then
CC="$PTHREAD_CC"
CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
LIBS="$LIBS $PTHREAD_LIBS"
dnl Do a compilation test, as this is currently not done by AX_PTHREAD.
dnl Moreover, MPFR needs pthread_rwlock_t, which is conditionally defined
dnl in glibc's bits/pthreadtypes.h (via <pthread.h>), not sure why...
AC_MSG_CHECKING([for pthread_rwlock_t])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <pthread.h>
]], [[
pthread_rwlock_t lock; (void) lock;
]])],
[AC_MSG_RESULT([yes])
mpfr_pthread_ok=yes],
[AC_MSG_RESULT([no])
mpfr_pthread_ok=no])
else
mpfr_pthread_ok=no
fi
fi
AC_MSG_CHECKING(if shared cache can be supported)
if test "$mpfr_c11_thread_ok" = yes; then
AC_MSG_RESULT([yes, with ISO C11 threads])
elif test "$mpfr_pthread_ok" = yes; then
AC_MSG_RESULT([yes, with pthread])
else
AC_MSG_RESULT(no)
AC_MSG_ERROR([shared cache needs C11 threads or pthread support])
fi
fi
dnl End of features for the MPFR shared cache.
AC_CHECK_HEADER([limits.h],, AC_MSG_ERROR([limits.h not found]))
AC_CHECK_HEADER([float.h],, AC_MSG_ERROR([float.h not found]))
AC_CHECK_HEADER([string.h],, AC_MSG_ERROR([string.h not found]))
dnl Check for locales
AC_CHECK_HEADERS([locale.h])
dnl Check for wide characters (wchar_t and wint_t)
AC_CHECK_HEADERS([wchar.h])
dnl Check for stdargs
AC_CHECK_HEADER([stdarg.h],[AC_DEFINE([HAVE_STDARG],1,[Define if stdarg])],
[AC_CHECK_HEADER([varargs.h],,
AC_MSG_ERROR([stdarg.h or varargs.h not found]))])
dnl sys/fpu.h - MIPS specific
AC_CHECK_HEADERS([sys/time.h sys/fpu.h])
dnl Android has a <locale.h>, but not the following members.
AC_CHECK_MEMBERS([struct lconv.decimal_point, struct lconv.thousands_sep],,,
[#include <locale.h>])
dnl Check how to get `alloca'
AC_FUNC_ALLOCA
dnl Define uintptr_t if not available.
AC_TYPE_UINTPTR_T
dnl va_copy macro
AC_MSG_CHECKING([how to copy va_list])
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <stdarg.h>
]], [[
va_list ap1, ap2;
va_copy(ap1, ap2);
]])], [
AC_MSG_RESULT([va_copy])
AC_DEFINE(HAVE_VA_COPY)
], [AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <stdarg.h>
]], [[
va_list ap1, ap2;
__va_copy(ap1, ap2);
]])], [AC_DEFINE([HAVE___VA_COPY]) AC_MSG_RESULT([__va_copy])],
[AC_MSG_RESULT([memcpy])])])
dnl FIXME: The functions memmove, memset and strtol are really needed by
dnl MPFR, but if they are implemented as macros, this is also OK (in our
dnl case). So, we do not return an error, but their tests are currently
dnl useless.
dnl Moreover, for memmove and memset, when gcc -Werror is used, these
dnl functions are considered to be missing because of a "conflicting
dnl types for built-in function" error. Possible workarounds if the
dnl results of this test are used (thus one doesn't want an error):
dnl * If "$GCC" is set, disable built-ins by adding -fno-builtin
dnl to $CFLAGS for this test (this would yield a failure if such
dnl functions are defined only as built-ins, but does this occur
dnl in practice?).
dnl * Enable -Werror only for the main compilation (and possibly
dnl some particular tests) via a new configure option.
dnl gettimeofday is not defined for MinGW
AC_CHECK_FUNCS([memmove memset setlocale strtol gettimeofday signal])
dnl We cannot use AC_CHECK_FUNCS on sigaction, because while this
dnl function may be provided by the C library, its prototype and
dnl associated structure may not be available, e.g. when compiling
dnl with "gcc -std=c99".
AC_MSG_CHECKING(for sigaction and its associated structure)
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <signal.h>
static int f (int (*func)(int, const struct sigaction *, struct sigaction *))
{ return 0; }
]], [[
return f(sigaction);
]])], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_SIGACTION, 1,
[Define if you have a working sigaction function.])
],[AC_MSG_RESULT(no)])
dnl check for long long
AC_CHECK_TYPE([long long int],
AC_DEFINE(HAVE_LONG_LONG, 1, [Define if compiler supports long long]),,)
dnl intmax_t is C99
AC_CHECK_TYPES([intmax_t])
if test "$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 "$mpfr_cv_have_intmax_max" = "yes"; then
AC_DEFINE(MPFR_HAVE_INTMAX_MAX,1,[Define if you have a working INTMAX_MAX.])
fi
fi
AC_CHECK_TYPE( [union fpc_csr],
AC_DEFINE(HAVE_FPC_CSR,1,[Define if union fpc_csr is available]), ,
[
#if HAVE_SYS_FPU_H
# include <sys/fpu.h>
#endif
])
dnl Check for _Noreturn function specifier (ISO C11)
AC_CACHE_CHECK([for _Noreturn], mpfr_cv_have_noreturn, [
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[_Noreturn void foo(int);]])],
mpfr_cv_have_noreturn=yes, mpfr_cv_have_noreturn=no)
])
if test "$mpfr_cv_have_noreturn" = "yes"; then
AC_DEFINE(MPFR_HAVE_NORETURN,1,[Define if the _Noreturn function specifier is supported.])
fi
dnl Check for __builtin_unreachable
AC_CACHE_CHECK([for __builtin_unreachable], mpfr_cv_have_builtin_unreachable,
[
AC_LINK_IFELSE([AC_LANG_PROGRAM(
[[int x;]],
[[if (x) __builtin_unreachable(); ]]
)],
mpfr_cv_have_builtin_unreachable=yes,
mpfr_cv_have_builtin_unreachable=no)
])
if test "$mpfr_cv_have_builtin_unreachable" = "yes"; then
AC_DEFINE(MPFR_HAVE_BUILTIN_UNREACHABLE, 1,
[Define if the __builtin_unreachable GCC built-in is supported.])
fi
dnl Check for attribute constructor and destructor
MPFR_CHECK_CONSTRUCTOR_ATTR()
dnl Check for fesetround
AC_CACHE_CHECK([for fesetround], mpfr_cv_have_fesetround, [
saved_LIBS="$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 numbers are supported.
dnl for the binary64 format, the smallest normal number is 2^(-1022)
dnl for the binary32 format, the smallest normal number is 2^(-126)
dnl Note: One could double-check with the value of the macros
dnl DBL_HAS_SUBNORM and FLT_HAS_SUBNORM, when defined (C2x), but
dnl neither tests would be reliable on implementations with partial
dnl subnormal support. Anyway, this check is useful only for the
dnl tests. Thus in doubt, assume that subnormals are not supported,
dnl in order to disable the corresponding tests (which could fail).
AC_CACHE_CHECK([for subnormal double-precision numbers],
mpfr_cv_have_subnorm_dbl, [
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 * (double) (x / 2.0) != x;
}
]])],
[mpfr_cv_have_subnorm_dbl="yes"],
[mpfr_cv_have_subnorm_dbl="no"],
[mpfr_cv_have_subnorm_dbl="cannot test, assume no"])
])
if test "$mpfr_cv_have_subnorm_dbl" = "yes"; then
AC_DEFINE(HAVE_SUBNORM_DBL, 1,
[Define if the double type fully supports subnormals.])
fi
AC_CACHE_CHECK([for subnormal single-precision numbers],
mpfr_cv_have_subnorm_flt, [
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <stdio.h>
int main (void) {
float x = 1.17549435082229e-38;
fprintf (stderr, "%e\n", x / 2.0);
return 2.0 * (float) (x / 2.0) != x;
}
]])],
[mpfr_cv_have_subnorm_flt="yes"],
[mpfr_cv_have_subnorm_flt="no"],
[mpfr_cv_have_subnorm_flt="cannot test, assume no"])
])
if test "$mpfr_cv_have_subnorm_flt" = "yes"; then
AC_DEFINE(HAVE_SUBNORM_FLT, 1,
[Define if the float type fully supports subnormals.])
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 "$mpfr_cv_have_signedz" = "yes"; then
AC_DEFINE(HAVE_SIGNEDZ,1,[Define if signed zeros are supported.])
fi
dnl Check the FP division by 0 fails (e.g. on a non-IEEE-754 platform).
dnl In such a case, MPFR_ERRDIVZERO is defined to disable the tests
dnl involving a FP division by 0.
dnl For the developers: to check whether all these tests are disabled,
dnl configure MPFR with "-DMPFR_TESTS_FPE_DIV -DMPFR_ERRDIVZERO".
AC_CACHE_CHECK([if the FP division by 0 fails], mpfr_cv_errdivzero, [
AC_RUN_IFELSE([AC_LANG_SOURCE([[
int main (void) {
volatile double d = 0.0, x;
x = 0.0 / d;
x = 1.0 / d;
(void) x;
return 0;
}
]])],
[mpfr_cv_errdivzero="no"],
[mpfr_cv_errdivzero="yes"],
[mpfr_cv_errdivzero="cannot test, assume no"])
])
if test "$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 "$mpfr_cv_nanisnan" = "yes"; then
AC_DEFINE(MPFR_NANISNAN,1,[Define if NAN == NAN.])
AC_MSG_WARN([The test NAN != NAN is false. The probable reason is that])
AC_MSG_WARN([your compiler optimizes floating-point expressions in an])
AC_MSG_WARN([unsafe way because some option, such as -ffast-math or])
AC_MSG_WARN([-fast (depending on the compiler), has been used. You])
AC_MSG_WARN([should NOT use such an option, otherwise MPFR functions])
AC_MSG_WARN([such as mpfr_get_d and mpfr_set_d may return incorrect])
AC_MSG_WARN([results on special FP numbers (e.g. NaN or signed zeros).])
AC_MSG_WARN([If you did not use such an option, please send us a bug])
AC_MSG_WARN([report so that we can try to find a workaround for your])
AC_MSG_WARN([platform and/or document the behavior.])
fi
dnl Check if the chars '0' to '9', 'a' to 'z', and 'A' to 'Z' are
dnl consecutive values.
dnl The const is necessary with GCC's "-Wwrite-strings -Werror".
AC_MSG_CHECKING([if charset has consecutive values])
AC_RUN_IFELSE([AC_LANG_PROGRAM([[
const char *number = "0123456789";
const char *lower = "abcdefghijklmnopqrstuvwxyz";
const char *upper = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
]],[[
int i;
unsigned char *p;
for (p = (unsigned char*) number, i = 0; i < 9; i++)
if ( (*p)+1 != *(p+1) ) return 1;
for (p = (unsigned char*) lower, i = 0; i < 25; i++)
if ( (*p)+1 != *(p+1) ) return 1;
for (p = (unsigned char*) upper, i = 0; i < 25; i++)
if ( (*p)+1 != *(p+1) ) return 1;
]])], [AC_MSG_RESULT(yes)],[
AC_MSG_RESULT(no)
AC_DEFINE(MPFR_NO_CONSECUTIVE_CHARSET,1,[Charset is not consecutive])
], [AC_MSG_RESULT(cannot test)])
dnl Must be checked with the LIBM
dnl but we don't want to add the LIBM to MPFR dependency.
dnl Can't use AC_CHECK_FUNCS since the function may be in LIBM but
dnl not exported in math.h
saved_LIBS="$LIBS"
LIBS="$LIBS $MPFR_LIBM"
dnl AC_CHECK_FUNCS([round trunc floor ceil nearbyint])
AC_MSG_CHECKING(for math/round)
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <math.h>
static int f (double (*func)(double)) { return 0; }
]], [[
return f(round);
]])], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_ROUND, 1,[Have ISO C99 round function])
],[AC_MSG_RESULT(no)])
AC_MSG_CHECKING(for math/trunc)
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <math.h>
static int f (double (*func)(double)) { return 0; }
]], [[
return f(trunc);
]])], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_TRUNC, 1,[Have ISO C99 trunc function])
],[AC_MSG_RESULT(no)])
AC_MSG_CHECKING(for math/floor)
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <math.h>
static int f (double (*func)(double)) { return 0; }
]], [[
return f(floor);
]])], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_FLOOR, 1,[Have ISO C99 floor function])
],[AC_MSG_RESULT(no)])
AC_MSG_CHECKING(for math/ceil)
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <math.h>
static int f (double (*func)(double)) { return 0; }
]], [[
return f(ceil);
]])], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_CEIL, 1,[Have ISO C99 ceil function])
],[AC_MSG_RESULT(no)])
AC_MSG_CHECKING(for math/nearbyint)
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <math.h>
static int f (double (*func)(double)) { return 0; }
]], [[
return f(nearbyint);
]])], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_NEARBYINT, 1,[Have ISO C99 nearbyint function])
],[AC_MSG_RESULT(no)])
dnl Check if _mulx_u64 is provided
dnl Note: This intrinsic is not standard. We need a run because
dnl it may be provided but not working as expected (with ICC 15,
dnl one gets an "Illegal instruction").
AC_MSG_CHECKING([for _mulx_u64])
AC_RUN_IFELSE([AC_LANG_PROGRAM([[
#include <immintrin.h>
]], [[
unsigned long long h1, h2;
_mulx_u64(17, 42, &h1);
_mulx_u64(-1, -1, &h2);
return h1 == 0 && h2 == -2 ? 0 : 1;
]])],
[AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_MULX_U64, 1,[Have a working _mulx_u64 function])
],
[AC_MSG_RESULT(no)
],
[AC_MSG_RESULT([cannot test, assume no])
])
LIBS="$saved_LIBS"
dnl Try to determine the format of double
dnl FIXME: Use a test like for long double instead of AC_RUN_IFELSE,
dnl which cannot run the test when cross-compiling.
AC_MSG_CHECKING(format of floating-point type `double')
AC_RUN_IFELSE([AC_LANG_PROGRAM([[
]], [[
union ieee_double_extract
{
double d;
unsigned char x[8];
} t;
t.d = 2.877939254133025759330166692961938679218292236328125; /* exact */
if (sizeof (double) != 8)
return 0;
if (sizeof (unsigned char) != 1)
return 0;
if (t.x[0] == 1 && t.x[1] == 2 && t.x[2] == 3 && t.x[3] == 4 &&
t.x[4] == 5 && t.x[5] == 6 && t.x[6] == 7 && t.x[7] == 64)
return 1; /* little endian */
else if (t.x[7] == 1 && t.x[6] == 2 && t.x[5] == 3 && t.x[4] == 4 &&
t.x[3] == 5 && t.x[2] == 6 && t.x[1] == 7 && t.x[0] == 64)
return 2; /* big endian */
else
return 0; /* unknown */
]])],
[mpfr_ieee_double=$?],
[mpfr_ieee_double=$?],
[mpfr_ieee_double=0])
case "$mpfr_ieee_double" in
1) AC_MSG_RESULT([IEEE little endian])
AC_DEFINE(HAVE_DOUBLE_IEEE_LITTLE_ENDIAN) ;;
2) AC_MSG_RESULT([IEEE big endian])
AC_DEFINE(HAVE_DOUBLE_IEEE_BIG_ENDIAN) ;;
*) AC_MSG_RESULT([unknown])
AC_MSG_WARN([format of `double' not recognized]) ;;
esac
dnl Now try to determine the format of long double
MPFR_C_LONG_DOUBLE_FORMAT
dnl Check if thread-local variables are supported.
dnl At least two problems can occur in practice:
dnl 1. The compilation fails, e.g. because the compiler doesn't know
dnl about the __thread keyword.
dnl 2. The compilation succeeds, but the system doesn't support TLS or
dnl there is some ld configuration problem. One of the effects can
dnl be that thread-local variables always evaluate to 0. So, it is
dnl important to run the test below.
if test "$enable_thread_safe" != no; then
AC_MSG_CHECKING(for TLS support using C11)
saved_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$CPPFLAGS -I$srcdir/src"
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#define MPFR_USE_THREAD_SAFE 1
#define MPFR_USE_C11_THREAD_SAFE 1
#include "mpfr-thread.h"
MPFR_THREAD_ATTR int x = 17;
int main (void) {
return x != 17;
}
]])],
[AC_MSG_RESULT(yes)
AC_DEFINE([MPFR_USE_THREAD_SAFE],1,[Build MPFR as thread safe])
AC_DEFINE([MPFR_USE_C11_THREAD_SAFE],1,[Build MPFR as thread safe using C11])
tls_c11_support=yes
enable_thread_safe=yes
],
[AC_MSG_RESULT(no)
],
[AC_MSG_RESULT([cannot test, assume no])
])
CPPFLAGS="$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])
enable_thread_safe=yes
],
[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="$saved_CPPFLAGS"
fi
fi
dnl Check if decimal floats are available.
dnl For the different cases, we try to use values that will not be returned
dnl by build tools. For instance, 1 must not be used as it can be returned
dnl by ld in case of link failure.
dnl Note: We currently reread the 64-bit data memory as a double and compare
dnl it with constants. However, if there is any issue with double, such as
dnl the use of an extended precision, this may fail. Possible solutions:
dnl 1. Use the hex format for the double constants (this format should be
dnl supported if _Decimal64 is).
dnl 2. Use more precision in the double constants (more decimal digits),
dnl just in case.
dnl 3. Use uint64_t (or unsigned long long, though this type might not be
dnl on 64 bits) instead of or in addition to the test on double.
dnl 4. Use an array of 8 unsigned char's instead of or in addition to the
dnl test on double, considering the 2 practical cases of endianness.
if test "$enable_decimal_float" != no; then
AC_MSG_CHECKING(if compiler knows _Decimal64)
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[_Decimal64 x;]])],
[AC_MSG_RESULT(yes)
AC_MSG_CHECKING(decimal float format)
AC_RUN_IFELSE([AC_LANG_PROGRAM([[
#include <stdlib.h>
]], [[
volatile _Decimal64 x = 1;
union { double d; _Decimal64 d64; } y;
if (x != x) return 83;
y.d64 = 1234567890123456.0dd;
return y.d == 0.14894469406741037E-123 ? 80 :
y.d == 0.59075095508629822E-68 ? 81 : 82;
]])], [AC_MSG_RESULT(internal error)
AC_MSG_FAILURE(unexpected exit status 0)],
[d64_exit_status=$?
case "$d64_exit_status" in
80) AC_MSG_RESULT(DPD)
if test "$enable_decimal_float" = bid; then
AC_MSG_ERROR([encoding mismatch (BID requested).])
fi
if test "$enable_decimal_float" != generic; then
enable_decimal_float=dpd
fi ;;
81) AC_MSG_RESULT(BID)
if test "$enable_decimal_float" = dpd; then
AC_MSG_ERROR([encoding mismatch (DPD requested).])
fi
if test "$enable_decimal_float" != generic; then
enable_decimal_float=bid
fi ;;
82) AC_MSG_RESULT(neither DPD nor BID)
if test "$enable_decimal_float" = dpd; then
AC_MSG_ERROR([encoding mismatch (DPD requested).])
fi
if test "$enable_decimal_float" = bid; then
AC_MSG_ERROR([encoding mismatch (BID requested).])
fi
enable_decimal_float=generic
AC_MSG_WARN([The _Decimal64 encoding is non-standard or there was an])
AC_MSG_WARN([issue with its detection. The generic code will be used.])
AC_MSG_WARN([Please do not forget to test with `make check'.])
AC_MSG_WARN([In case of failure of a decimal test, you should rebuild])
AC_MSG_WARN([MPFR without --enable-decimal-float.]) ;;
*) AC_MSG_RESULT(error (exit status $d64_exit_status))
case "$enable_decimal_float" in
yes|bid|dpd|generic) AC_MSG_FAILURE([internal or link error.
Please build MPFR without --enable-decimal-float.]) ;;
*) enable_decimal_float=no ;;
esac ;;
esac],
[AC_MSG_RESULT(cannot test)
dnl Since the _Decimal64 type exists, we assume that it is correctly
dnl supported. The detection of the encoding may still be done at
dnl compile time. We do not add a configure test for it so that this
dnl can be done on platforms where configure cannot be used.
enable_decimal_float=compile-time])
],
[AC_MSG_RESULT(no)
case "$enable_decimal_float" in
yes|bid|dpd|generic)
AC_MSG_FAILURE([compiler doesn't know _Decimal64 (ISO/IEC TR 24732).
Please use another compiler or build MPFR without --enable-decimal-float.]) ;;
*) enable_decimal_float=no ;;
esac])
if test "$enable_decimal_float" != no; then
AC_DEFINE([MPFR_WANT_DECIMAL_FLOATS],1,
[Build decimal float functions])
case "$enable_decimal_float" in
dpd) AC_DEFINE([DECIMAL_DPD_FORMAT],1,[]) ;;
bid) AC_DEFINE([DECIMAL_BID_FORMAT],1,[]) ;;
generic) AC_DEFINE([DECIMAL_GENERIC_CODE],1,[]) ;;
compile-time) ;;
*) AC_MSG_ERROR(internal error) ;;
esac
fi
fi
dnl Check the bit-field ordering for _Decimal128.
dnl Little endian: sig=0 comb=49400 t0=0 t1=0 t2=0 t3=10
dnl Big endian: sig=0 comb=8 t0=0 t1=0 t2=0 t3=570933248
AC_MSG_CHECKING(bit-field ordering for _Decimal128)
AC_RUN_IFELSE([AC_LANG_PROGRAM([[
]], [[
union ieee_decimal128
{
struct
{
unsigned int t3:32;
unsigned int t2:32;
unsigned int t1:32;
unsigned int t0:14;
unsigned int comb:17;
unsigned int sig:1;
} s;
_Decimal128 d128;
} x;
x.d128 = 1.0dl;
if (x.s.sig==0 && x.s.comb==49400 && x.s.t0==0 && x.s.t1==0 && x.s.t2==0 && x.s.t3==10)
return 1; /* little endian */
else if (x.s.sig==0 && x.s.comb==8 && x.s.t0==0 && x.s.t1==0 && x.s.t2==0 && x.s.t3==570933248)
return 2; /* big endian */
else
return 0; /* unknown encoding */
]])], [AC_MSG_RESULT(unknown)],
[d128_exit_status=$?
case "$d128_exit_status" in
1) AC_MSG_RESULT(little endian)
AC_DEFINE([HAVE_DECIMAL128_IEEE_LITTLE_ENDIAN],1) ;;
2) AC_MSG_RESULT(big endian)
AC_DEFINE([HAVE_DECIMAL128_IEEE_BIG_ENDIAN],1) ;;
esac],
[AC_MSG_RESULT(cannot test)])
dnl Check if _Float128 or __float128 is available. We also require the
dnl compiler to support hex constants with the f128 or q suffix (this
dnl prevents the _Float128 support with GCC's -std=c90, but who cares?).
dnl Note: We use AC_LINK_IFELSE instead of AC_COMPILE_IFELSE since an
dnl error may occur only at link time, such as under NetBSD:
dnl https://mail-index.netbsd.org/pkgsrc-users/2018/02/02/msg026220.html
dnl https://mail-index.netbsd.org/pkgsrc-users/2018/02/05/msg026238.html
dnl By using volatile and making the exit code depend on the value of
dnl this variable, we also make sure that optimization doesn't make
dnl the "undefined reference" error disappear.
if test "$enable_float128" != no; then
AC_MSG_CHECKING(if _Float128 with hex constants is supported)
AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[
volatile _Float128 x = 0x1.fp+16383f128;
return x == 0;
]])],
[AC_MSG_RESULT(yes)
AC_DEFINE([MPFR_WANT_FLOAT128],1,[Build float128 functions])],
[AC_MSG_RESULT(no)
AC_MSG_CHECKING(if __float128 can be used as a fallback)
dnl Use the q suffix in this case.
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#define _Float128 __float128
]], [[
volatile _Float128 x = 0x1.fp+16383q;
return x == 0;
]])],
[AC_MSG_RESULT(yes)
AC_DEFINE([MPFR_WANT_FLOAT128],2,
[Build float128 functions with float128 fallback])
AC_DEFINE([_Float128],[__float128],[__float128 fallback])],
[AC_MSG_RESULT(no)
if test "$enable_float128" = yes; then
AC_MSG_ERROR(
[compiler doesn't know _Float128 or __float128 with hex constants.
Please use another compiler or build MPFR without --enable-float128.])
fi])
])
fi
dnl Check if Static Assertions are supported.
AC_MSG_CHECKING(for Static Assertion support)
saved_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$CPPFLAGS -I$srcdir/src"
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
#define MPFR_USE_STATIC_ASSERT 1
#include "mpfr-sassert.h"
/* Test if Static Assertions work */
MPFR_DECL_STATIC_ASSERT(sizeof(char) <= sizeof(int));
int main (void) {
MPFR_DECL_STATIC_ASSERT(sizeof(int) <= sizeof(long));
int x;
(void) (x = 1); /* cast to void: avoid a warning, at least with GCC */
/* Test of the macro after a declaraction and a statement. */
MPFR_STAT_STATIC_ASSERT(sizeof(short) <= sizeof(int));
return 0;
}
]])],
[AC_MSG_RESULT(yes)
AC_DEFINE([MPFR_USE_STATIC_ASSERT],1,[Build MPFR with Static Assertions])
],
[AC_MSG_RESULT(no)
])
CPPFLAGS="$saved_CPPFLAGS"
if test "$enable_lto" = "yes" ; then
MPFR_LTO
fi
dnl Logging support needs nested functions and the 'cleanup' attribute.
dnl This is checked at the end because the change of CC and/or CFLAGS that
dnl could occur before may have an influence on this test. The tested code
dnl is very similar to what is used in MPFR (mpfr-impl.h).
if test "$enable_logging" = yes; then
AC_MSG_CHECKING(for nested functions and 'cleanup' attribute)
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
int main (void) {
auto void f_cleanup (int *p);
void f_cleanup (int *p) { int v = *p; (void) v; }
int v __attribute__ ((cleanup (f_cleanup)));
v = 0;
return 0;
}
]])],
[AC_MSG_RESULT(yes)],
[AC_MSG_RESULT(no)
AC_MSG_ERROR([logging support needs nested functions and the 'cleanup' attribute])
])
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 $mpfr_cv_dbl_int_bug in
yes*)
AC_MSG_ERROR([double-to-integer conversion is incorrect.
You need to use another compiler (or lower the optimization level).]) ;;
esac
])
dnl MPFR_CHECK_MP_LIMB_T_VS_LONG
dnl ----------------------------
dnl Check that a long can fit in a mp_limb_t.
dnl If so, it set the define MPFR_LONG_WITHIN_LIMB
dnl FIXME: The following code is wrong when using:
dnl -std=c99 -pedantic-errors -Wno-error=overlength-strings
dnl because static assertions are not supported, so that MPFR_ASSERTN
dnl is used, but it is not defined by "mpfr-sassert.h". The consequence
dnl is that the program fails, and MPFR_LONG_WITHIN_LIMB is not defined
dnl while it should be. Before fixing this bug, find a way to test with
dnl MPFR_LONG_WITHIN_LIMB undefined; this is necessary for code coverage
dnl and possibly to find new bugs, like in r12252:
dnl ./configure --enable-assert=full \
dnl 'CFLAGS=-std=c99 -O3 -pedantic-errors -Wno-error=overlength-strings'
dnl According to the GMP developers, a limb is always as large as a long,
dnl except when __GMP_SHORT_LIMB is defined, but this is never defined:
dnl https://gmplib.org/list-archives/gmp-discuss/2018-February/006190.html
dnl FIXME: This is not safe. The fact that __GMP_SHORT_LIMB cannot occur
dnl is not documented, and gmp.h has such a code probably because it may
dnl occur in the future (or the user may want to override the default
dnl choice).
AC_DEFUN([MPFR_CHECK_MP_LIMB_T_VS_LONG], [
AC_REQUIRE([MPFR_CONFIGS])
AC_CACHE_CHECK([for long to fit in mp_limb_t], mpfr_cv_long_within_limb, [
saved_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$CPPFLAGS -I$srcdir/src"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <gmp.h>