2 dnl Copyright (C) 2007-2012 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
9 AC_REQUIRE([gl_MATH_H_DEFAULTS])
10 gl_CHECK_NEXT_HEADERS([math.h])
11 AC_REQUIRE([AC_C_INLINE])
13 AC_CACHE_CHECK([whether NAN macro works], [gl_cv_header_math_nan_works],
14 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[@%:@include <math.h>]],
15 [[/* Solaris 10 has a broken definition of NAN. Other platforms
16 fail to provide NAN, or provide it only in C99 mode; this
17 test only needs to fail when NAN is provided but wrong. */
23 [gl_cv_header_math_nan_works=yes],
24 [gl_cv_header_math_nan_works=no])])
25 if test $gl_cv_header_math_nan_works = no; then
28 AC_CACHE_CHECK([whether HUGE_VAL works], [gl_cv_header_math_huge_val_works],
29 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[@%:@include <math.h>]],
30 [[/* Solaris 10 has a broken definition of HUGE_VAL. */
33 [gl_cv_header_math_huge_val_works=yes],
34 [gl_cv_header_math_huge_val_works=no])])
35 if test $gl_cv_header_math_huge_val_works = no; then
39 dnl Check for declarations of anything we want to poison if the
40 dnl corresponding gnulib module is not in use.
41 gl_WARN_ON_USE_PREPARE([[#include <math.h>]],
42 [acosf acosl asinf asinl atanf atanl
43 cbrt cbrtf cbrtl ceilf ceill copysign copysignf copysignl cosf cosl coshf
44 expf expl exp2 exp2f exp2l expm1 expm1f expm1l
45 fabsf fabsl floorf floorl fma fmaf fmal
46 fmod fmodf fmodl frexpf frexpl hypotf hypotl
48 logb log logf logl log10 log10f log10l log1p log1pf log1pl log2 log2f log2l
50 remainder remainderf remainderl
51 rint rintf rintl round roundf roundl sinf sinl sinhf sqrtf sqrtl
52 tanf tanl tanhf trunc truncf truncl])
55 AC_DEFUN([gl_MATH_MODULE_INDICATOR],
57 dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
58 AC_REQUIRE([gl_MATH_H_DEFAULTS])
59 gl_MODULE_INDICATOR_SET_VARIABLE([$1])
60 dnl Define it also as a C macro, for the benefit of the unit tests.
61 gl_MODULE_INDICATOR_FOR_TESTS([$1])
64 AC_DEFUN([gl_MATH_H_DEFAULTS],
66 GNULIB_ACOSF=0; AC_SUBST([GNULIB_ACOSF])
67 GNULIB_ACOSL=0; AC_SUBST([GNULIB_ACOSL])
68 GNULIB_ASINF=0; AC_SUBST([GNULIB_ASINF])
69 GNULIB_ASINL=0; AC_SUBST([GNULIB_ASINL])
70 GNULIB_ATANF=0; AC_SUBST([GNULIB_ATANF])
71 GNULIB_ATANL=0; AC_SUBST([GNULIB_ATANL])
72 GNULIB_ATAN2F=0; AC_SUBST([GNULIB_ATAN2F])
73 GNULIB_CBRT=0; AC_SUBST([GNULIB_CBRT])
74 GNULIB_CBRTF=0; AC_SUBST([GNULIB_CBRTF])
75 GNULIB_CBRTL=0; AC_SUBST([GNULIB_CBRTL])
76 GNULIB_CEIL=0; AC_SUBST([GNULIB_CEIL])
77 GNULIB_CEILF=0; AC_SUBST([GNULIB_CEILF])
78 GNULIB_CEILL=0; AC_SUBST([GNULIB_CEILL])
79 GNULIB_COPYSIGN=0; AC_SUBST([GNULIB_COPYSIGN])
80 GNULIB_COPYSIGNF=0; AC_SUBST([GNULIB_COPYSIGNF])
81 GNULIB_COPYSIGNL=0; AC_SUBST([GNULIB_COPYSIGNL])
82 GNULIB_COSF=0; AC_SUBST([GNULIB_COSF])
83 GNULIB_COSL=0; AC_SUBST([GNULIB_COSL])
84 GNULIB_COSHF=0; AC_SUBST([GNULIB_COSHF])
85 GNULIB_EXPF=0; AC_SUBST([GNULIB_EXPF])
86 GNULIB_EXPL=0; AC_SUBST([GNULIB_EXPL])
87 GNULIB_EXP2=0; AC_SUBST([GNULIB_EXP2])
88 GNULIB_EXP2F=0; AC_SUBST([GNULIB_EXP2F])
89 GNULIB_EXP2L=0; AC_SUBST([GNULIB_EXP2L])
90 GNULIB_EXPM1=0; AC_SUBST([GNULIB_EXPM1])
91 GNULIB_EXPM1F=0; AC_SUBST([GNULIB_EXPM1F])
92 GNULIB_EXPM1L=0; AC_SUBST([GNULIB_EXPM1L])
93 GNULIB_FABSF=0; AC_SUBST([GNULIB_FABSF])
94 GNULIB_FABSL=0; AC_SUBST([GNULIB_FABSL])
95 GNULIB_FLOOR=0; AC_SUBST([GNULIB_FLOOR])
96 GNULIB_FLOORF=0; AC_SUBST([GNULIB_FLOORF])
97 GNULIB_FLOORL=0; AC_SUBST([GNULIB_FLOORL])
98 GNULIB_FMA=0; AC_SUBST([GNULIB_FMA])
99 GNULIB_FMAF=0; AC_SUBST([GNULIB_FMAF])
100 GNULIB_FMAL=0; AC_SUBST([GNULIB_FMAL])
101 GNULIB_FMOD=0; AC_SUBST([GNULIB_FMOD])
102 GNULIB_FMODF=0; AC_SUBST([GNULIB_FMODF])
103 GNULIB_FMODL=0; AC_SUBST([GNULIB_FMODL])
104 GNULIB_FREXPF=0; AC_SUBST([GNULIB_FREXPF])
105 GNULIB_FREXP=0; AC_SUBST([GNULIB_FREXP])
106 GNULIB_FREXPL=0; AC_SUBST([GNULIB_FREXPL])
107 GNULIB_HYPOT=0; AC_SUBST([GNULIB_HYPOT])
108 GNULIB_HYPOTF=0; AC_SUBST([GNULIB_HYPOTF])
109 GNULIB_HYPOTL=0; AC_SUBST([GNULIB_HYPOTL])
110 GNULIB_ISFINITE=0; AC_SUBST([GNULIB_ISFINITE])
111 GNULIB_ISINF=0; AC_SUBST([GNULIB_ISINF])
112 GNULIB_ISNAN=0; AC_SUBST([GNULIB_ISNAN])
113 GNULIB_ISNANF=0; AC_SUBST([GNULIB_ISNANF])
114 GNULIB_ISNAND=0; AC_SUBST([GNULIB_ISNAND])
115 GNULIB_ISNANL=0; AC_SUBST([GNULIB_ISNANL])
116 GNULIB_LDEXPF=0; AC_SUBST([GNULIB_LDEXPF])
117 GNULIB_LDEXPL=0; AC_SUBST([GNULIB_LDEXPL])
118 GNULIB_LOGB=0; AC_SUBST([GNULIB_LOGB])
119 GNULIB_LOG=0; AC_SUBST([GNULIB_LOG])
120 GNULIB_LOGF=0; AC_SUBST([GNULIB_LOGF])
121 GNULIB_LOGL=0; AC_SUBST([GNULIB_LOGL])
122 GNULIB_LOG10=0; AC_SUBST([GNULIB_LOG10])
123 GNULIB_LOG10F=0; AC_SUBST([GNULIB_LOG10F])
124 GNULIB_LOG10L=0; AC_SUBST([GNULIB_LOG10L])
125 GNULIB_LOG1P=0; AC_SUBST([GNULIB_LOG1P])
126 GNULIB_LOG1PF=0; AC_SUBST([GNULIB_LOG1PF])
127 GNULIB_LOG1PL=0; AC_SUBST([GNULIB_LOG1PL])
128 GNULIB_LOG2=0; AC_SUBST([GNULIB_LOG2])
129 GNULIB_LOG2F=0; AC_SUBST([GNULIB_LOG2F])
130 GNULIB_LOG2L=0; AC_SUBST([GNULIB_LOG2L])
131 GNULIB_MODF=0; AC_SUBST([GNULIB_MODF])
132 GNULIB_MODFF=0; AC_SUBST([GNULIB_MODFF])
133 GNULIB_MODFL=0; AC_SUBST([GNULIB_MODFL])
134 GNULIB_POWF=0; AC_SUBST([GNULIB_POWF])
135 GNULIB_REMAINDER=0; AC_SUBST([GNULIB_REMAINDER])
136 GNULIB_REMAINDERF=0; AC_SUBST([GNULIB_REMAINDERF])
137 GNULIB_REMAINDERL=0; AC_SUBST([GNULIB_REMAINDERL])
138 GNULIB_RINT=0; AC_SUBST([GNULIB_RINT])
139 GNULIB_RINTF=0; AC_SUBST([GNULIB_RINTF])
140 GNULIB_RINTL=0; AC_SUBST([GNULIB_RINTL])
141 GNULIB_ROUND=0; AC_SUBST([GNULIB_ROUND])
142 GNULIB_ROUNDF=0; AC_SUBST([GNULIB_ROUNDF])
143 GNULIB_ROUNDL=0; AC_SUBST([GNULIB_ROUNDL])
144 GNULIB_SIGNBIT=0; AC_SUBST([GNULIB_SIGNBIT])
145 GNULIB_SINF=0; AC_SUBST([GNULIB_SINF])
146 GNULIB_SINL=0; AC_SUBST([GNULIB_SINL])
147 GNULIB_SINHF=0; AC_SUBST([GNULIB_SINHF])
148 GNULIB_SQRTF=0; AC_SUBST([GNULIB_SQRTF])
149 GNULIB_SQRTL=0; AC_SUBST([GNULIB_SQRTL])
150 GNULIB_TANF=0; AC_SUBST([GNULIB_TANF])
151 GNULIB_TANL=0; AC_SUBST([GNULIB_TANL])
152 GNULIB_TANHF=0; AC_SUBST([GNULIB_TANHF])
153 GNULIB_TRUNC=0; AC_SUBST([GNULIB_TRUNC])
154 GNULIB_TRUNCF=0; AC_SUBST([GNULIB_TRUNCF])
155 GNULIB_TRUNCL=0; AC_SUBST([GNULIB_TRUNCL])
156 dnl Assume proper GNU behavior unless another module says otherwise.
157 HAVE_ACOSF=1; AC_SUBST([HAVE_ACOSF])
158 HAVE_ACOSL=1; AC_SUBST([HAVE_ACOSL])
159 HAVE_ASINF=1; AC_SUBST([HAVE_ASINF])
160 HAVE_ASINL=1; AC_SUBST([HAVE_ASINL])
161 HAVE_ATANF=1; AC_SUBST([HAVE_ATANF])
162 HAVE_ATANL=1; AC_SUBST([HAVE_ATANL])
163 HAVE_ATAN2F=1; AC_SUBST([HAVE_ATAN2F])
164 HAVE_CBRT=1; AC_SUBST([HAVE_CBRT])
165 HAVE_CBRTF=1; AC_SUBST([HAVE_CBRTF])
166 HAVE_CBRTL=1; AC_SUBST([HAVE_CBRTL])
167 HAVE_COPYSIGN=1; AC_SUBST([HAVE_COPYSIGN])
168 HAVE_COPYSIGNL=1; AC_SUBST([HAVE_COPYSIGNL])
169 HAVE_COSF=1; AC_SUBST([HAVE_COSF])
170 HAVE_COSL=1; AC_SUBST([HAVE_COSL])
171 HAVE_COSHF=1; AC_SUBST([HAVE_COSHF])
172 HAVE_EXPF=1; AC_SUBST([HAVE_EXPF])
173 HAVE_EXPL=1; AC_SUBST([HAVE_EXPL])
174 HAVE_EXPM1=1; AC_SUBST([HAVE_EXPM1])
175 HAVE_EXPM1F=1; AC_SUBST([HAVE_EXPM1F])
176 HAVE_FABSF=1; AC_SUBST([HAVE_FABSF])
177 HAVE_FABSL=1; AC_SUBST([HAVE_FABSL])
178 HAVE_FMA=1; AC_SUBST([HAVE_FMA])
179 HAVE_FMAF=1; AC_SUBST([HAVE_FMAF])
180 HAVE_FMAL=1; AC_SUBST([HAVE_FMAL])
181 HAVE_FMODF=1; AC_SUBST([HAVE_FMODF])
182 HAVE_FMODL=1; AC_SUBST([HAVE_FMODL])
183 HAVE_FREXPF=1; AC_SUBST([HAVE_FREXPF])
184 HAVE_HYPOTF=1; AC_SUBST([HAVE_HYPOTF])
185 HAVE_HYPOTL=1; AC_SUBST([HAVE_HYPOTL])
186 HAVE_ISNANF=1; AC_SUBST([HAVE_ISNANF])
187 HAVE_ISNAND=1; AC_SUBST([HAVE_ISNAND])
188 HAVE_ISNANL=1; AC_SUBST([HAVE_ISNANL])
189 HAVE_LDEXPF=1; AC_SUBST([HAVE_LDEXPF])
190 HAVE_LOGF=1; AC_SUBST([HAVE_LOGF])
191 HAVE_LOGL=1; AC_SUBST([HAVE_LOGL])
192 HAVE_LOG10F=1; AC_SUBST([HAVE_LOG10F])
193 HAVE_LOG10L=1; AC_SUBST([HAVE_LOG10L])
194 HAVE_LOG1P=1; AC_SUBST([HAVE_LOG1P])
195 HAVE_LOG1PF=1; AC_SUBST([HAVE_LOG1PF])
196 HAVE_LOG1PL=1; AC_SUBST([HAVE_LOG1PL])
197 HAVE_MODFF=1; AC_SUBST([HAVE_MODFF])
198 HAVE_MODFL=1; AC_SUBST([HAVE_MODFL])
199 HAVE_POWF=1; AC_SUBST([HAVE_POWF])
200 HAVE_REMAINDER=1; AC_SUBST([HAVE_REMAINDER])
201 HAVE_REMAINDERF=1; AC_SUBST([HAVE_REMAINDERF])
202 HAVE_RINT=1; AC_SUBST([HAVE_RINT])
203 HAVE_RINTL=1; AC_SUBST([HAVE_RINTL])
204 HAVE_SINF=1; AC_SUBST([HAVE_SINF])
205 HAVE_SINL=1; AC_SUBST([HAVE_SINL])
206 HAVE_SINHF=1; AC_SUBST([HAVE_SINHF])
207 HAVE_SQRTF=1; AC_SUBST([HAVE_SQRTF])
208 HAVE_SQRTL=1; AC_SUBST([HAVE_SQRTL])
209 HAVE_TANF=1; AC_SUBST([HAVE_TANF])
210 HAVE_TANL=1; AC_SUBST([HAVE_TANL])
211 HAVE_TANHF=1; AC_SUBST([HAVE_TANHF])
212 HAVE_DECL_ACOSL=1; AC_SUBST([HAVE_DECL_ACOSL])
213 HAVE_DECL_ASINL=1; AC_SUBST([HAVE_DECL_ASINL])
214 HAVE_DECL_ATANL=1; AC_SUBST([HAVE_DECL_ATANL])
215 HAVE_DECL_CBRTF=1; AC_SUBST([HAVE_DECL_CBRTF])
216 HAVE_DECL_CBRTL=1; AC_SUBST([HAVE_DECL_CBRTL])
217 HAVE_DECL_CEILF=1; AC_SUBST([HAVE_DECL_CEILF])
218 HAVE_DECL_CEILL=1; AC_SUBST([HAVE_DECL_CEILL])
219 HAVE_DECL_COPYSIGNF=1; AC_SUBST([HAVE_DECL_COPYSIGNF])
220 HAVE_DECL_COSL=1; AC_SUBST([HAVE_DECL_COSL])
221 HAVE_DECL_EXPL=1; AC_SUBST([HAVE_DECL_EXPL])
222 HAVE_DECL_EXP2=1; AC_SUBST([HAVE_DECL_EXP2])
223 HAVE_DECL_EXP2F=1; AC_SUBST([HAVE_DECL_EXP2F])
224 HAVE_DECL_EXP2L=1; AC_SUBST([HAVE_DECL_EXP2L])
225 HAVE_DECL_EXPM1L=1; AC_SUBST([HAVE_DECL_EXPM1L])
226 HAVE_DECL_FLOORF=1; AC_SUBST([HAVE_DECL_FLOORF])
227 HAVE_DECL_FLOORL=1; AC_SUBST([HAVE_DECL_FLOORL])
228 HAVE_DECL_FREXPL=1; AC_SUBST([HAVE_DECL_FREXPL])
229 HAVE_DECL_LDEXPL=1; AC_SUBST([HAVE_DECL_LDEXPL])
230 HAVE_DECL_LOGB=1; AC_SUBST([HAVE_DECL_LOGB])
231 HAVE_DECL_LOGL=1; AC_SUBST([HAVE_DECL_LOGL])
232 HAVE_DECL_LOG10L=1; AC_SUBST([HAVE_DECL_LOG10L])
233 HAVE_DECL_LOG2=1; AC_SUBST([HAVE_DECL_LOG2])
234 HAVE_DECL_LOG2F=1; AC_SUBST([HAVE_DECL_LOG2F])
235 HAVE_DECL_LOG2L=1; AC_SUBST([HAVE_DECL_LOG2L])
236 HAVE_DECL_REMAINDER=1; AC_SUBST([HAVE_DECL_REMAINDER])
237 HAVE_DECL_REMAINDERL=1; AC_SUBST([HAVE_DECL_REMAINDERL])
238 HAVE_DECL_RINTF=1; AC_SUBST([HAVE_DECL_RINTF])
239 HAVE_DECL_ROUND=1; AC_SUBST([HAVE_DECL_ROUND])
240 HAVE_DECL_ROUNDF=1; AC_SUBST([HAVE_DECL_ROUNDF])
241 HAVE_DECL_ROUNDL=1; AC_SUBST([HAVE_DECL_ROUNDL])
242 HAVE_DECL_SINL=1; AC_SUBST([HAVE_DECL_SINL])
243 HAVE_DECL_SQRTL=1; AC_SUBST([HAVE_DECL_SQRTL])
244 HAVE_DECL_TANL=1; AC_SUBST([HAVE_DECL_TANL])
245 HAVE_DECL_TRUNC=1; AC_SUBST([HAVE_DECL_TRUNC])
246 HAVE_DECL_TRUNCF=1; AC_SUBST([HAVE_DECL_TRUNCF])
247 HAVE_DECL_TRUNCL=1; AC_SUBST([HAVE_DECL_TRUNCL])
248 REPLACE_CBRTF=0; AC_SUBST([REPLACE_CBRTF])
249 REPLACE_CBRTL=0; AC_SUBST([REPLACE_CBRTL])
250 REPLACE_CEIL=0; AC_SUBST([REPLACE_CEIL])
251 REPLACE_CEILF=0; AC_SUBST([REPLACE_CEILF])
252 REPLACE_CEILL=0; AC_SUBST([REPLACE_CEILL])
253 REPLACE_EXPM1=0; AC_SUBST([REPLACE_EXPM1])
254 REPLACE_EXPM1F=0; AC_SUBST([REPLACE_EXPM1F])
255 REPLACE_EXP2=0; AC_SUBST([REPLACE_EXP2])
256 REPLACE_EXP2L=0; AC_SUBST([REPLACE_EXP2L])
257 REPLACE_FABSL=0; AC_SUBST([REPLACE_FABSL])
258 REPLACE_FLOOR=0; AC_SUBST([REPLACE_FLOOR])
259 REPLACE_FLOORF=0; AC_SUBST([REPLACE_FLOORF])
260 REPLACE_FLOORL=0; AC_SUBST([REPLACE_FLOORL])
261 REPLACE_FMA=0; AC_SUBST([REPLACE_FMA])
262 REPLACE_FMAF=0; AC_SUBST([REPLACE_FMAF])
263 REPLACE_FMAL=0; AC_SUBST([REPLACE_FMAL])
264 REPLACE_FMOD=0; AC_SUBST([REPLACE_FMOD])
265 REPLACE_FMODF=0; AC_SUBST([REPLACE_FMODF])
266 REPLACE_FMODL=0; AC_SUBST([REPLACE_FMODL])
267 REPLACE_FREXPF=0; AC_SUBST([REPLACE_FREXPF])
268 REPLACE_FREXP=0; AC_SUBST([REPLACE_FREXP])
269 REPLACE_FREXPL=0; AC_SUBST([REPLACE_FREXPL])
270 REPLACE_HUGE_VAL=0; AC_SUBST([REPLACE_HUGE_VAL])
271 REPLACE_HYPOT=0; AC_SUBST([REPLACE_HYPOT])
272 REPLACE_HYPOTF=0; AC_SUBST([REPLACE_HYPOTF])
273 REPLACE_HYPOTL=0; AC_SUBST([REPLACE_HYPOTL])
274 REPLACE_ISFINITE=0; AC_SUBST([REPLACE_ISFINITE])
275 REPLACE_ISINF=0; AC_SUBST([REPLACE_ISINF])
276 REPLACE_ISNAN=0; AC_SUBST([REPLACE_ISNAN])
277 REPLACE_LDEXPL=0; AC_SUBST([REPLACE_LDEXPL])
278 REPLACE_LOG=0; AC_SUBST([REPLACE_LOG])
279 REPLACE_LOGF=0; AC_SUBST([REPLACE_LOGF])
280 REPLACE_LOGL=0; AC_SUBST([REPLACE_LOGL])
281 REPLACE_LOG10=0; AC_SUBST([REPLACE_LOG10])
282 REPLACE_LOG1P=0; AC_SUBST([REPLACE_LOG1P])
283 REPLACE_LOG1PF=0; AC_SUBST([REPLACE_LOG1PF])
284 REPLACE_LOG1PL=0; AC_SUBST([REPLACE_LOG1PL])
285 REPLACE_LOG2=0; AC_SUBST([REPLACE_LOG2])
286 REPLACE_LOG2F=0; AC_SUBST([REPLACE_LOG2F])
287 REPLACE_LOG2L=0; AC_SUBST([REPLACE_LOG2L])
288 REPLACE_MODF=0; AC_SUBST([REPLACE_MODF])
289 REPLACE_MODFF=0; AC_SUBST([REPLACE_MODFF])
290 REPLACE_MODFL=0; AC_SUBST([REPLACE_MODFL])
291 REPLACE_NAN=0; AC_SUBST([REPLACE_NAN])
292 REPLACE_REMAINDER=0; AC_SUBST([REPLACE_REMAINDER])
293 REPLACE_REMAINDERF=0; AC_SUBST([REPLACE_REMAINDERF])
294 REPLACE_REMAINDERL=0; AC_SUBST([REPLACE_REMAINDERL])
295 REPLACE_ROUND=0; AC_SUBST([REPLACE_ROUND])
296 REPLACE_ROUNDF=0; AC_SUBST([REPLACE_ROUNDF])
297 REPLACE_ROUNDL=0; AC_SUBST([REPLACE_ROUNDL])
298 REPLACE_SIGNBIT=0; AC_SUBST([REPLACE_SIGNBIT])
299 REPLACE_SIGNBIT_USING_GCC=0; AC_SUBST([REPLACE_SIGNBIT_USING_GCC])
300 REPLACE_SQRTL=0; AC_SUBST([REPLACE_SQRTL])
301 REPLACE_TRUNC=0; AC_SUBST([REPLACE_TRUNC])
302 REPLACE_TRUNCF=0; AC_SUBST([REPLACE_TRUNCF])
303 REPLACE_TRUNCL=0; AC_SUBST([REPLACE_TRUNCL])
306 # gl_LONG_DOUBLE_VS_DOUBLE
307 # determines whether 'long double' and 'double' have the same representation.
308 # Sets variable HAVE_SAME_LONG_DOUBLE_AS_DOUBLE to 0 or 1, and defines
309 # HAVE_SAME_LONG_DOUBLE_AS_DOUBLE accordingly.
310 # The currently known platforms where this is the case are:
311 # Linux/HPPA, Minix 3.1.8, AIX 5, AIX 6 and 7 with xlc, MSVC 9.
312 AC_DEFUN([gl_LONG_DOUBLE_VS_DOUBLE],
314 AC_CACHE_CHECK([whether long double and double are the same],
315 [gl_cv_long_double_equals_double],
317 [AC_LANG_PROGRAM([[#include <float.h>]],
318 [[typedef int check[sizeof (long double) == sizeof (double)
319 && LDBL_MANT_DIG == DBL_MANT_DIG
320 && LDBL_MAX_EXP == DBL_MAX_EXP
321 && LDBL_MIN_EXP == DBL_MIN_EXP
324 [gl_cv_long_double_equals_double=yes],
325 [gl_cv_long_double_equals_double=no])
327 if test $gl_cv_long_double_equals_double = yes; then
328 AC_DEFINE([HAVE_SAME_LONG_DOUBLE_AS_DOUBLE], [1],
329 [Define to 1 if 'long double' and 'double' have the same representation.])
330 HAVE_SAME_LONG_DOUBLE_AS_DOUBLE=1
332 HAVE_SAME_LONG_DOUBLE_AS_DOUBLE=0
334 AC_SUBST([HAVE_SAME_LONG_DOUBLE_AS_DOUBLE])