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|
# math_h.m4 serial 114
dnl Copyright (C) 2007-2016 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
AC_DEFUN([gl_MATH_H],
[
AC_REQUIRE([gl_MATH_H_DEFAULTS])
gl_CHECK_NEXT_HEADERS([math.h])
AC_CACHE_CHECK([whether NAN macro works], [gl_cv_header_math_nan_works],
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[@%:@include <math.h>]],
[[/* Solaris 10 has a broken definition of NAN. Other platforms
fail to provide NAN, or provide it only in C99 mode; this
test only needs to fail when NAN is provided but wrong. */
float f = 1.0f;
#ifdef NAN
f = NAN;
#endif
return f == 0;]])],
[gl_cv_header_math_nan_works=yes],
[gl_cv_header_math_nan_works=no])])
if test $gl_cv_header_math_nan_works = no; then
REPLACE_NAN=1
fi
AC_CACHE_CHECK([whether HUGE_VAL works], [gl_cv_header_math_huge_val_works],
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[@%:@include <math.h>]],
[[/* Solaris 10 has a broken definition of HUGE_VAL. */
double d = HUGE_VAL;
return d == 0;]])],
[gl_cv_header_math_huge_val_works=yes],
[gl_cv_header_math_huge_val_works=no])])
if test $gl_cv_header_math_huge_val_works = no; then
REPLACE_HUGE_VAL=1
fi
dnl Check for declarations of anything we want to poison if the
dnl corresponding gnulib module is not in use.
gl_WARN_ON_USE_PREPARE([[#include <math.h>]],
[acosf acosl asinf asinl atanf atanl
cbrt cbrtf cbrtl ceilf ceill copysign copysignf copysignl cosf cosl coshf
expf expl exp2 exp2f exp2l expm1 expm1f expm1l
fabsf fabsl floorf floorl fma fmaf fmal
fmod fmodf fmodl frexpf frexpl hypotf hypotl
ilogb ilogbf ilogbl
ldexpf ldexpl
log logf logl log10 log10f log10l log1p log1pf log1pl log2 log2f log2l
logb logbf logbl
modf modff modfl powf
remainder remainderf remainderl
rint rintf rintl round roundf roundl sinf sinl sinhf sqrtf sqrtl
tanf tanl tanhf trunc truncf truncl])
])
AC_DEFUN([gl_MATH_MODULE_INDICATOR],
[
dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
AC_REQUIRE([gl_MATH_H_DEFAULTS])
gl_MODULE_INDICATOR_SET_VARIABLE([$1])
dnl Define it also as a C macro, for the benefit of the unit tests.
gl_MODULE_INDICATOR_FOR_TESTS([$1])
])
AC_DEFUN([gl_MATH_H_DEFAULTS],
[
GNULIB_ACOSF=0; AC_SUBST([GNULIB_ACOSF])
GNULIB_ACOSL=0; AC_SUBST([GNULIB_ACOSL])
GNULIB_ASINF=0; AC_SUBST([GNULIB_ASINF])
GNULIB_ASINL=0; AC_SUBST([GNULIB_ASINL])
GNULIB_ATANF=0; AC_SUBST([GNULIB_ATANF])
GNULIB_ATANL=0; AC_SUBST([GNULIB_ATANL])
GNULIB_ATAN2F=0; AC_SUBST([GNULIB_ATAN2F])
GNULIB_CBRT=0; AC_SUBST([GNULIB_CBRT])
GNULIB_CBRTF=0; AC_SUBST([GNULIB_CBRTF])
GNULIB_CBRTL=0; AC_SUBST([GNULIB_CBRTL])
GNULIB_CEIL=0; AC_SUBST([GNULIB_CEIL])
GNULIB_CEILF=0; AC_SUBST([GNULIB_CEILF])
GNULIB_CEILL=0; AC_SUBST([GNULIB_CEILL])
GNULIB_COPYSIGN=0; AC_SUBST([GNULIB_COPYSIGN])
GNULIB_COPYSIGNF=0; AC_SUBST([GNULIB_COPYSIGNF])
GNULIB_COPYSIGNL=0; AC_SUBST([GNULIB_COPYSIGNL])
GNULIB_COSF=0; AC_SUBST([GNULIB_COSF])
GNULIB_COSL=0; AC_SUBST([GNULIB_COSL])
GNULIB_COSHF=0; AC_SUBST([GNULIB_COSHF])
GNULIB_EXPF=0; AC_SUBST([GNULIB_EXPF])
GNULIB_EXPL=0; AC_SUBST([GNULIB_EXPL])
GNULIB_EXP2=0; AC_SUBST([GNULIB_EXP2])
GNULIB_EXP2F=0; AC_SUBST([GNULIB_EXP2F])
GNULIB_EXP2L=0; AC_SUBST([GNULIB_EXP2L])
GNULIB_EXPM1=0; AC_SUBST([GNULIB_EXPM1])
GNULIB_EXPM1F=0; AC_SUBST([GNULIB_EXPM1F])
GNULIB_EXPM1L=0; AC_SUBST([GNULIB_EXPM1L])
GNULIB_FABSF=0; AC_SUBST([GNULIB_FABSF])
GNULIB_FABSL=0; AC_SUBST([GNULIB_FABSL])
GNULIB_FLOOR=0; AC_SUBST([GNULIB_FLOOR])
GNULIB_FLOORF=0; AC_SUBST([GNULIB_FLOORF])
GNULIB_FLOORL=0; AC_SUBST([GNULIB_FLOORL])
GNULIB_FMA=0; AC_SUBST([GNULIB_FMA])
GNULIB_FMAF=0; AC_SUBST([GNULIB_FMAF])
GNULIB_FMAL=0; AC_SUBST([GNULIB_FMAL])
GNULIB_FMOD=0; AC_SUBST([GNULIB_FMOD])
GNULIB_FMODF=0; AC_SUBST([GNULIB_FMODF])
GNULIB_FMODL=0; AC_SUBST([GNULIB_FMODL])
GNULIB_FREXPF=0; AC_SUBST([GNULIB_FREXPF])
GNULIB_FREXP=0; AC_SUBST([GNULIB_FREXP])
GNULIB_FREXPL=0; AC_SUBST([GNULIB_FREXPL])
GNULIB_HYPOT=0; AC_SUBST([GNULIB_HYPOT])
GNULIB_HYPOTF=0; AC_SUBST([GNULIB_HYPOTF])
GNULIB_HYPOTL=0; AC_SUBST([GNULIB_HYPOTL])
GNULIB_ILOGB=0; AC_SUBST([GNULIB_ILOGB])
GNULIB_ILOGBF=0; AC_SUBST([GNULIB_ILOGBF])
GNULIB_ILOGBL=0; AC_SUBST([GNULIB_ILOGBL])
GNULIB_ISFINITE=0; AC_SUBST([GNULIB_ISFINITE])
GNULIB_ISINF=0; AC_SUBST([GNULIB_ISINF])
GNULIB_ISNAN=0; AC_SUBST([GNULIB_ISNAN])
GNULIB_ISNANF=0; AC_SUBST([GNULIB_ISNANF])
GNULIB_ISNAND=0; AC_SUBST([GNULIB_ISNAND])
GNULIB_ISNANL=0; AC_SUBST([GNULIB_ISNANL])
GNULIB_LDEXPF=0; AC_SUBST([GNULIB_LDEXPF])
GNULIB_LDEXPL=0; AC_SUBST([GNULIB_LDEXPL])
GNULIB_LOG=0; AC_SUBST([GNULIB_LOG])
GNULIB_LOGF=0; AC_SUBST([GNULIB_LOGF])
GNULIB_LOGL=0; AC_SUBST([GNULIB_LOGL])
GNULIB_LOG10=0; AC_SUBST([GNULIB_LOG10])
GNULIB_LOG10F=0; AC_SUBST([GNULIB_LOG10F])
GNULIB_LOG10L=0; AC_SUBST([GNULIB_LOG10L])
GNULIB_LOG1P=0; AC_SUBST([GNULIB_LOG1P])
GNULIB_LOG1PF=0; AC_SUBST([GNULIB_LOG1PF])
GNULIB_LOG1PL=0; AC_SUBST([GNULIB_LOG1PL])
GNULIB_LOG2=0; AC_SUBST([GNULIB_LOG2])
GNULIB_LOG2F=0; AC_SUBST([GNULIB_LOG2F])
GNULIB_LOG2L=0; AC_SUBST([GNULIB_LOG2L])
GNULIB_LOGB=0; AC_SUBST([GNULIB_LOGB])
GNULIB_LOGBF=0; AC_SUBST([GNULIB_LOGBF])
GNULIB_LOGBL=0; AC_SUBST([GNULIB_LOGBL])
GNULIB_MODF=0; AC_SUBST([GNULIB_MODF])
GNULIB_MODFF=0; AC_SUBST([GNULIB_MODFF])
GNULIB_MODFL=0; AC_SUBST([GNULIB_MODFL])
GNULIB_POWF=0; AC_SUBST([GNULIB_POWF])
GNULIB_REMAINDER=0; AC_SUBST([GNULIB_REMAINDER])
GNULIB_REMAINDERF=0; AC_SUBST([GNULIB_REMAINDERF])
GNULIB_REMAINDERL=0; AC_SUBST([GNULIB_REMAINDERL])
GNULIB_RINT=0; AC_SUBST([GNULIB_RINT])
GNULIB_RINTF=0; AC_SUBST([GNULIB_RINTF])
GNULIB_RINTL=0; AC_SUBST([GNULIB_RINTL])
GNULIB_ROUND=0; AC_SUBST([GNULIB_ROUND])
GNULIB_ROUNDF=0; AC_SUBST([GNULIB_ROUNDF])
GNULIB_ROUNDL=0; AC_SUBST([GNULIB_ROUNDL])
GNULIB_SIGNBIT=0; AC_SUBST([GNULIB_SIGNBIT])
GNULIB_SINF=0; AC_SUBST([GNULIB_SINF])
GNULIB_SINL=0; AC_SUBST([GNULIB_SINL])
GNULIB_SINHF=0; AC_SUBST([GNULIB_SINHF])
GNULIB_SQRTF=0; AC_SUBST([GNULIB_SQRTF])
GNULIB_SQRTL=0; AC_SUBST([GNULIB_SQRTL])
GNULIB_TANF=0; AC_SUBST([GNULIB_TANF])
GNULIB_TANL=0; AC_SUBST([GNULIB_TANL])
GNULIB_TANHF=0; AC_SUBST([GNULIB_TANHF])
GNULIB_TRUNC=0; AC_SUBST([GNULIB_TRUNC])
GNULIB_TRUNCF=0; AC_SUBST([GNULIB_TRUNCF])
GNULIB_TRUNCL=0; AC_SUBST([GNULIB_TRUNCL])
dnl Assume proper GNU behavior unless another module says otherwise.
HAVE_ACOSF=1; AC_SUBST([HAVE_ACOSF])
HAVE_ACOSL=1; AC_SUBST([HAVE_ACOSL])
HAVE_ASINF=1; AC_SUBST([HAVE_ASINF])
HAVE_ASINL=1; AC_SUBST([HAVE_ASINL])
HAVE_ATANF=1; AC_SUBST([HAVE_ATANF])
HAVE_ATANL=1; AC_SUBST([HAVE_ATANL])
HAVE_ATAN2F=1; AC_SUBST([HAVE_ATAN2F])
HAVE_CBRT=1; AC_SUBST([HAVE_CBRT])
HAVE_CBRTF=1; AC_SUBST([HAVE_CBRTF])
HAVE_CBRTL=1; AC_SUBST([HAVE_CBRTL])
HAVE_COPYSIGN=1; AC_SUBST([HAVE_COPYSIGN])
HAVE_COPYSIGNL=1; AC_SUBST([HAVE_COPYSIGNL])
HAVE_COSF=1; AC_SUBST([HAVE_COSF])
HAVE_COSL=1; AC_SUBST([HAVE_COSL])
HAVE_COSHF=1; AC_SUBST([HAVE_COSHF])
HAVE_EXPF=1; AC_SUBST([HAVE_EXPF])
HAVE_EXPL=1; AC_SUBST([HAVE_EXPL])
HAVE_EXPM1=1; AC_SUBST([HAVE_EXPM1])
HAVE_EXPM1F=1; AC_SUBST([HAVE_EXPM1F])
HAVE_FABSF=1; AC_SUBST([HAVE_FABSF])
HAVE_FABSL=1; AC_SUBST([HAVE_FABSL])
HAVE_FMA=1; AC_SUBST([HAVE_FMA])
HAVE_FMAF=1; AC_SUBST([HAVE_FMAF])
HAVE_FMAL=1; AC_SUBST([HAVE_FMAL])
HAVE_FMODF=1; AC_SUBST([HAVE_FMODF])
HAVE_FMODL=1; AC_SUBST([HAVE_FMODL])
HAVE_FREXPF=1; AC_SUBST([HAVE_FREXPF])
HAVE_HYPOTF=1; AC_SUBST([HAVE_HYPOTF])
HAVE_HYPOTL=1; AC_SUBST([HAVE_HYPOTL])
HAVE_ILOGB=1; AC_SUBST([HAVE_ILOGB])
HAVE_ILOGBF=1; AC_SUBST([HAVE_ILOGBF])
HAVE_ILOGBL=1; AC_SUBST([HAVE_ILOGBL])
HAVE_ISNANF=1; AC_SUBST([HAVE_ISNANF])
HAVE_ISNAND=1; AC_SUBST([HAVE_ISNAND])
HAVE_ISNANL=1; AC_SUBST([HAVE_ISNANL])
HAVE_LDEXPF=1; AC_SUBST([HAVE_LDEXPF])
HAVE_LOGF=1; AC_SUBST([HAVE_LOGF])
HAVE_LOGL=1; AC_SUBST([HAVE_LOGL])
HAVE_LOG10F=1; AC_SUBST([HAVE_LOG10F])
HAVE_LOG10L=1; AC_SUBST([HAVE_LOG10L])
HAVE_LOG1P=1; AC_SUBST([HAVE_LOG1P])
HAVE_LOG1PF=1; AC_SUBST([HAVE_LOG1PF])
HAVE_LOG1PL=1; AC_SUBST([HAVE_LOG1PL])
HAVE_LOGBF=1; AC_SUBST([HAVE_LOGBF])
HAVE_LOGBL=1; AC_SUBST([HAVE_LOGBL])
HAVE_MODFF=1; AC_SUBST([HAVE_MODFF])
HAVE_MODFL=1; AC_SUBST([HAVE_MODFL])
HAVE_POWF=1; AC_SUBST([HAVE_POWF])
HAVE_REMAINDER=1; AC_SUBST([HAVE_REMAINDER])
HAVE_REMAINDERF=1; AC_SUBST([HAVE_REMAINDERF])
HAVE_RINT=1; AC_SUBST([HAVE_RINT])
HAVE_RINTL=1; AC_SUBST([HAVE_RINTL])
HAVE_SINF=1; AC_SUBST([HAVE_SINF])
HAVE_SINL=1; AC_SUBST([HAVE_SINL])
HAVE_SINHF=1; AC_SUBST([HAVE_SINHF])
HAVE_SQRTF=1; AC_SUBST([HAVE_SQRTF])
HAVE_SQRTL=1; AC_SUBST([HAVE_SQRTL])
HAVE_TANF=1; AC_SUBST([HAVE_TANF])
HAVE_TANL=1; AC_SUBST([HAVE_TANL])
HAVE_TANHF=1; AC_SUBST([HAVE_TANHF])
HAVE_DECL_ACOSL=1; AC_SUBST([HAVE_DECL_ACOSL])
HAVE_DECL_ASINL=1; AC_SUBST([HAVE_DECL_ASINL])
HAVE_DECL_ATANL=1; AC_SUBST([HAVE_DECL_ATANL])
HAVE_DECL_CBRTF=1; AC_SUBST([HAVE_DECL_CBRTF])
HAVE_DECL_CBRTL=1; AC_SUBST([HAVE_DECL_CBRTL])
HAVE_DECL_CEILF=1; AC_SUBST([HAVE_DECL_CEILF])
HAVE_DECL_CEILL=1; AC_SUBST([HAVE_DECL_CEILL])
HAVE_DECL_COPYSIGNF=1; AC_SUBST([HAVE_DECL_COPYSIGNF])
HAVE_DECL_COSL=1; AC_SUBST([HAVE_DECL_COSL])
HAVE_DECL_EXPL=1; AC_SUBST([HAVE_DECL_EXPL])
HAVE_DECL_EXP2=1; AC_SUBST([HAVE_DECL_EXP2])
HAVE_DECL_EXP2F=1; AC_SUBST([HAVE_DECL_EXP2F])
HAVE_DECL_EXP2L=1; AC_SUBST([HAVE_DECL_EXP2L])
HAVE_DECL_EXPM1L=1; AC_SUBST([HAVE_DECL_EXPM1L])
HAVE_DECL_FLOORF=1; AC_SUBST([HAVE_DECL_FLOORF])
HAVE_DECL_FLOORL=1; AC_SUBST([HAVE_DECL_FLOORL])
HAVE_DECL_FREXPL=1; AC_SUBST([HAVE_DECL_FREXPL])
HAVE_DECL_LDEXPL=1; AC_SUBST([HAVE_DECL_LDEXPL])
HAVE_DECL_LOGL=1; AC_SUBST([HAVE_DECL_LOGL])
HAVE_DECL_LOG10L=1; AC_SUBST([HAVE_DECL_LOG10L])
HAVE_DECL_LOG2=1; AC_SUBST([HAVE_DECL_LOG2])
HAVE_DECL_LOG2F=1; AC_SUBST([HAVE_DECL_LOG2F])
HAVE_DECL_LOG2L=1; AC_SUBST([HAVE_DECL_LOG2L])
HAVE_DECL_LOGB=1; AC_SUBST([HAVE_DECL_LOGB])
HAVE_DECL_REMAINDER=1; AC_SUBST([HAVE_DECL_REMAINDER])
HAVE_DECL_REMAINDERL=1; AC_SUBST([HAVE_DECL_REMAINDERL])
HAVE_DECL_RINTF=1; AC_SUBST([HAVE_DECL_RINTF])
HAVE_DECL_ROUND=1; AC_SUBST([HAVE_DECL_ROUND])
HAVE_DECL_ROUNDF=1; AC_SUBST([HAVE_DECL_ROUNDF])
HAVE_DECL_ROUNDL=1; AC_SUBST([HAVE_DECL_ROUNDL])
HAVE_DECL_SINL=1; AC_SUBST([HAVE_DECL_SINL])
HAVE_DECL_SQRTL=1; AC_SUBST([HAVE_DECL_SQRTL])
HAVE_DECL_TANL=1; AC_SUBST([HAVE_DECL_TANL])
HAVE_DECL_TRUNC=1; AC_SUBST([HAVE_DECL_TRUNC])
HAVE_DECL_TRUNCF=1; AC_SUBST([HAVE_DECL_TRUNCF])
HAVE_DECL_TRUNCL=1; AC_SUBST([HAVE_DECL_TRUNCL])
REPLACE_CBRTF=0; AC_SUBST([REPLACE_CBRTF])
REPLACE_CBRTL=0; AC_SUBST([REPLACE_CBRTL])
REPLACE_CEIL=0; AC_SUBST([REPLACE_CEIL])
REPLACE_CEILF=0; AC_SUBST([REPLACE_CEILF])
REPLACE_CEILL=0; AC_SUBST([REPLACE_CEILL])
REPLACE_EXPM1=0; AC_SUBST([REPLACE_EXPM1])
REPLACE_EXPM1F=0; AC_SUBST([REPLACE_EXPM1F])
REPLACE_EXP2=0; AC_SUBST([REPLACE_EXP2])
REPLACE_EXP2L=0; AC_SUBST([REPLACE_EXP2L])
REPLACE_FABSL=0; AC_SUBST([REPLACE_FABSL])
REPLACE_FLOOR=0; AC_SUBST([REPLACE_FLOOR])
REPLACE_FLOORF=0; AC_SUBST([REPLACE_FLOORF])
REPLACE_FLOORL=0; AC_SUBST([REPLACE_FLOORL])
REPLACE_FMA=0; AC_SUBST([REPLACE_FMA])
REPLACE_FMAF=0; AC_SUBST([REPLACE_FMAF])
REPLACE_FMAL=0; AC_SUBST([REPLACE_FMAL])
REPLACE_FMOD=0; AC_SUBST([REPLACE_FMOD])
REPLACE_FMODF=0; AC_SUBST([REPLACE_FMODF])
REPLACE_FMODL=0; AC_SUBST([REPLACE_FMODL])
REPLACE_FREXPF=0; AC_SUBST([REPLACE_FREXPF])
REPLACE_FREXP=0; AC_SUBST([REPLACE_FREXP])
REPLACE_FREXPL=0; AC_SUBST([REPLACE_FREXPL])
REPLACE_HUGE_VAL=0; AC_SUBST([REPLACE_HUGE_VAL])
REPLACE_HYPOT=0; AC_SUBST([REPLACE_HYPOT])
REPLACE_HYPOTF=0; AC_SUBST([REPLACE_HYPOTF])
REPLACE_HYPOTL=0; AC_SUBST([REPLACE_HYPOTL])
REPLACE_ILOGB=0; AC_SUBST([REPLACE_ILOGB])
REPLACE_ILOGBF=0; AC_SUBST([REPLACE_ILOGBF])
REPLACE_ISFINITE=0; AC_SUBST([REPLACE_ISFINITE])
REPLACE_ISINF=0; AC_SUBST([REPLACE_ISINF])
REPLACE_ISNAN=0; AC_SUBST([REPLACE_ISNAN])
REPLACE_LDEXPL=0; AC_SUBST([REPLACE_LDEXPL])
REPLACE_LOG=0; AC_SUBST([REPLACE_LOG])
REPLACE_LOGF=0; AC_SUBST([REPLACE_LOGF])
REPLACE_LOGL=0; AC_SUBST([REPLACE_LOGL])
REPLACE_LOG10=0; AC_SUBST([REPLACE_LOG10])
REPLACE_LOG10F=0; AC_SUBST([REPLACE_LOG10F])
REPLACE_LOG10L=0; AC_SUBST([REPLACE_LOG10L])
REPLACE_LOG1P=0; AC_SUBST([REPLACE_LOG1P])
REPLACE_LOG1PF=0; AC_SUBST([REPLACE_LOG1PF])
REPLACE_LOG1PL=0; AC_SUBST([REPLACE_LOG1PL])
REPLACE_LOG2=0; AC_SUBST([REPLACE_LOG2])
REPLACE_LOG2F=0; AC_SUBST([REPLACE_LOG2F])
REPLACE_LOG2L=0; AC_SUBST([REPLACE_LOG2L])
REPLACE_LOGB=0; AC_SUBST([REPLACE_LOGB])
REPLACE_LOGBF=0; AC_SUBST([REPLACE_LOGBF])
REPLACE_LOGBL=0; AC_SUBST([REPLACE_LOGBL])
REPLACE_MODF=0; AC_SUBST([REPLACE_MODF])
REPLACE_MODFF=0; AC_SUBST([REPLACE_MODFF])
REPLACE_MODFL=0; AC_SUBST([REPLACE_MODFL])
REPLACE_NAN=0; AC_SUBST([REPLACE_NAN])
REPLACE_REMAINDER=0; AC_SUBST([REPLACE_REMAINDER])
REPLACE_REMAINDERF=0; AC_SUBST([REPLACE_REMAINDERF])
REPLACE_REMAINDERL=0; AC_SUBST([REPLACE_REMAINDERL])
REPLACE_ROUND=0; AC_SUBST([REPLACE_ROUND])
REPLACE_ROUNDF=0; AC_SUBST([REPLACE_ROUNDF])
REPLACE_ROUNDL=0; AC_SUBST([REPLACE_ROUNDL])
REPLACE_SIGNBIT=0; AC_SUBST([REPLACE_SIGNBIT])
REPLACE_SIGNBIT_USING_GCC=0; AC_SUBST([REPLACE_SIGNBIT_USING_GCC])
REPLACE_SQRTL=0; AC_SUBST([REPLACE_SQRTL])
REPLACE_TRUNC=0; AC_SUBST([REPLACE_TRUNC])
REPLACE_TRUNCF=0; AC_SUBST([REPLACE_TRUNCF])
REPLACE_TRUNCL=0; AC_SUBST([REPLACE_TRUNCL])
])
# gl_LONG_DOUBLE_VS_DOUBLE
# determines whether 'long double' and 'double' have the same representation.
# Sets variable HAVE_SAME_LONG_DOUBLE_AS_DOUBLE to 0 or 1, and defines
# HAVE_SAME_LONG_DOUBLE_AS_DOUBLE accordingly.
# The currently known platforms where this is the case are:
# Linux/HPPA, Minix 3.1.8, AIX 5, AIX 6 and 7 with xlc, MSVC 9.
AC_DEFUN([gl_LONG_DOUBLE_VS_DOUBLE],
[
AC_CACHE_CHECK([whether long double and double are the same],
[gl_cv_long_double_equals_double],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[#include <float.h>]],
[[typedef int check[sizeof (long double) == sizeof (double)
&& LDBL_MANT_DIG == DBL_MANT_DIG
&& LDBL_MAX_EXP == DBL_MAX_EXP
&& LDBL_MIN_EXP == DBL_MIN_EXP
? 1 : -1];
]])],
[gl_cv_long_double_equals_double=yes],
[gl_cv_long_double_equals_double=no])
])
if test $gl_cv_long_double_equals_double = yes; then
AC_DEFINE([HAVE_SAME_LONG_DOUBLE_AS_DOUBLE], [1],
[Define to 1 if 'long double' and 'double' have the same representation.])
HAVE_SAME_LONG_DOUBLE_AS_DOUBLE=1
else
HAVE_SAME_LONG_DOUBLE_AS_DOUBLE=0
fi
AC_SUBST([HAVE_SAME_LONG_DOUBLE_AS_DOUBLE])
])
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