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 log logf logl log10 log10f log10l log1p log1pf log1pl log2 log2f log2l
51 remainder remainderf remainderl
52 rint rintf rintl round roundf roundl sinf sinl sinhf sqrtf sqrtl
53 tanf tanl tanhf trunc truncf truncl])
56 AC_DEFUN([gl_MATH_MODULE_INDICATOR],
58 dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
59 AC_REQUIRE([gl_MATH_H_DEFAULTS])
60 gl_MODULE_INDICATOR_SET_VARIABLE([$1])
61 dnl Define it also as a C macro, for the benefit of the unit tests.
62 gl_MODULE_INDICATOR_FOR_TESTS([$1])
65 AC_DEFUN([gl_MATH_H_DEFAULTS],
67 GNULIB_ACOSF=0; AC_SUBST([GNULIB_ACOSF])
68 GNULIB_ACOSL=0; AC_SUBST([GNULIB_ACOSL])
69 GNULIB_ASINF=0; AC_SUBST([GNULIB_ASINF])
70 GNULIB_ASINL=0; AC_SUBST([GNULIB_ASINL])
71 GNULIB_ATANF=0; AC_SUBST([GNULIB_ATANF])
72 GNULIB_ATANL=0; AC_SUBST([GNULIB_ATANL])
73 GNULIB_ATAN2F=0; AC_SUBST([GNULIB_ATAN2F])
74 GNULIB_CBRT=0; AC_SUBST([GNULIB_CBRT])
75 GNULIB_CBRTF=0; AC_SUBST([GNULIB_CBRTF])
76 GNULIB_CBRTL=0; AC_SUBST([GNULIB_CBRTL])
77 GNULIB_CEIL=0; AC_SUBST([GNULIB_CEIL])
78 GNULIB_CEILF=0; AC_SUBST([GNULIB_CEILF])
79 GNULIB_CEILL=0; AC_SUBST([GNULIB_CEILL])
80 GNULIB_COPYSIGN=0; AC_SUBST([GNULIB_COPYSIGN])
81 GNULIB_COPYSIGNF=0; AC_SUBST([GNULIB_COPYSIGNF])
82 GNULIB_COPYSIGNL=0; AC_SUBST([GNULIB_COPYSIGNL])
83 GNULIB_COSF=0; AC_SUBST([GNULIB_COSF])
84 GNULIB_COSL=0; AC_SUBST([GNULIB_COSL])
85 GNULIB_COSHF=0; AC_SUBST([GNULIB_COSHF])
86 GNULIB_EXPF=0; AC_SUBST([GNULIB_EXPF])
87 GNULIB_EXPL=0; AC_SUBST([GNULIB_EXPL])
88 GNULIB_EXP2=0; AC_SUBST([GNULIB_EXP2])
89 GNULIB_EXP2F=0; AC_SUBST([GNULIB_EXP2F])
90 GNULIB_EXP2L=0; AC_SUBST([GNULIB_EXP2L])
91 GNULIB_EXPM1=0; AC_SUBST([GNULIB_EXPM1])
92 GNULIB_EXPM1F=0; AC_SUBST([GNULIB_EXPM1F])
93 GNULIB_EXPM1L=0; AC_SUBST([GNULIB_EXPM1L])
94 GNULIB_FABSF=0; AC_SUBST([GNULIB_FABSF])
95 GNULIB_FABSL=0; AC_SUBST([GNULIB_FABSL])
96 GNULIB_FLOOR=0; AC_SUBST([GNULIB_FLOOR])
97 GNULIB_FLOORF=0; AC_SUBST([GNULIB_FLOORF])
98 GNULIB_FLOORL=0; AC_SUBST([GNULIB_FLOORL])
99 GNULIB_FMA=0; AC_SUBST([GNULIB_FMA])
100 GNULIB_FMAF=0; AC_SUBST([GNULIB_FMAF])
101 GNULIB_FMAL=0; AC_SUBST([GNULIB_FMAL])
102 GNULIB_FMOD=0; AC_SUBST([GNULIB_FMOD])
103 GNULIB_FMODF=0; AC_SUBST([GNULIB_FMODF])
104 GNULIB_FMODL=0; AC_SUBST([GNULIB_FMODL])
105 GNULIB_FREXPF=0; AC_SUBST([GNULIB_FREXPF])
106 GNULIB_FREXP=0; AC_SUBST([GNULIB_FREXP])
107 GNULIB_FREXPL=0; AC_SUBST([GNULIB_FREXPL])
108 GNULIB_HYPOT=0; AC_SUBST([GNULIB_HYPOT])
109 GNULIB_HYPOTF=0; AC_SUBST([GNULIB_HYPOTF])
110 GNULIB_HYPOTL=0; AC_SUBST([GNULIB_HYPOTL])
111 GNULIB_ISFINITE=0; AC_SUBST([GNULIB_ISFINITE])
112 GNULIB_ISINF=0; AC_SUBST([GNULIB_ISINF])
113 GNULIB_ISNAN=0; AC_SUBST([GNULIB_ISNAN])
114 GNULIB_ISNANF=0; AC_SUBST([GNULIB_ISNANF])
115 GNULIB_ISNAND=0; AC_SUBST([GNULIB_ISNAND])
116 GNULIB_ISNANL=0; AC_SUBST([GNULIB_ISNANL])
117 GNULIB_LDEXPF=0; AC_SUBST([GNULIB_LDEXPF])
118 GNULIB_LDEXPL=0; AC_SUBST([GNULIB_LDEXPL])
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_LOGB=0; AC_SUBST([GNULIB_LOGB])
132 GNULIB_MODF=0; AC_SUBST([GNULIB_MODF])
133 GNULIB_MODFF=0; AC_SUBST([GNULIB_MODFF])
134 GNULIB_MODFL=0; AC_SUBST([GNULIB_MODFL])
135 GNULIB_POWF=0; AC_SUBST([GNULIB_POWF])
136 GNULIB_REMAINDER=0; AC_SUBST([GNULIB_REMAINDER])
137 GNULIB_REMAINDERF=0; AC_SUBST([GNULIB_REMAINDERF])
138 GNULIB_REMAINDERL=0; AC_SUBST([GNULIB_REMAINDERL])
139 GNULIB_RINT=0; AC_SUBST([GNULIB_RINT])
140 GNULIB_RINTF=0; AC_SUBST([GNULIB_RINTF])
141 GNULIB_RINTL=0; AC_SUBST([GNULIB_RINTL])
142 GNULIB_ROUND=0; AC_SUBST([GNULIB_ROUND])
143 GNULIB_ROUNDF=0; AC_SUBST([GNULIB_ROUNDF])
144 GNULIB_ROUNDL=0; AC_SUBST([GNULIB_ROUNDL])
145 GNULIB_SIGNBIT=0; AC_SUBST([GNULIB_SIGNBIT])
146 GNULIB_SINF=0; AC_SUBST([GNULIB_SINF])
147 GNULIB_SINL=0; AC_SUBST([GNULIB_SINL])
148 GNULIB_SINHF=0; AC_SUBST([GNULIB_SINHF])
149 GNULIB_SQRTF=0; AC_SUBST([GNULIB_SQRTF])
150 GNULIB_SQRTL=0; AC_SUBST([GNULIB_SQRTL])
151 GNULIB_TANF=0; AC_SUBST([GNULIB_TANF])
152 GNULIB_TANL=0; AC_SUBST([GNULIB_TANL])
153 GNULIB_TANHF=0; AC_SUBST([GNULIB_TANHF])
154 GNULIB_TRUNC=0; AC_SUBST([GNULIB_TRUNC])
155 GNULIB_TRUNCF=0; AC_SUBST([GNULIB_TRUNCF])
156 GNULIB_TRUNCL=0; AC_SUBST([GNULIB_TRUNCL])
157 dnl Assume proper GNU behavior unless another module says otherwise.
158 HAVE_ACOSF=1; AC_SUBST([HAVE_ACOSF])
159 HAVE_ACOSL=1; AC_SUBST([HAVE_ACOSL])
160 HAVE_ASINF=1; AC_SUBST([HAVE_ASINF])
161 HAVE_ASINL=1; AC_SUBST([HAVE_ASINL])
162 HAVE_ATANF=1; AC_SUBST([HAVE_ATANF])
163 HAVE_ATANL=1; AC_SUBST([HAVE_ATANL])
164 HAVE_ATAN2F=1; AC_SUBST([HAVE_ATAN2F])
165 HAVE_CBRT=1; AC_SUBST([HAVE_CBRT])
166 HAVE_CBRTF=1; AC_SUBST([HAVE_CBRTF])
167 HAVE_CBRTL=1; AC_SUBST([HAVE_CBRTL])
168 HAVE_COPYSIGN=1; AC_SUBST([HAVE_COPYSIGN])
169 HAVE_COPYSIGNL=1; AC_SUBST([HAVE_COPYSIGNL])
170 HAVE_COSF=1; AC_SUBST([HAVE_COSF])
171 HAVE_COSL=1; AC_SUBST([HAVE_COSL])
172 HAVE_COSHF=1; AC_SUBST([HAVE_COSHF])
173 HAVE_EXPF=1; AC_SUBST([HAVE_EXPF])
174 HAVE_EXPL=1; AC_SUBST([HAVE_EXPL])
175 HAVE_EXPM1=1; AC_SUBST([HAVE_EXPM1])
176 HAVE_EXPM1F=1; AC_SUBST([HAVE_EXPM1F])
177 HAVE_FABSF=1; AC_SUBST([HAVE_FABSF])
178 HAVE_FABSL=1; AC_SUBST([HAVE_FABSL])
179 HAVE_FMA=1; AC_SUBST([HAVE_FMA])
180 HAVE_FMAF=1; AC_SUBST([HAVE_FMAF])
181 HAVE_FMAL=1; AC_SUBST([HAVE_FMAL])
182 HAVE_FMODF=1; AC_SUBST([HAVE_FMODF])
183 HAVE_FMODL=1; AC_SUBST([HAVE_FMODL])
184 HAVE_FREXPF=1; AC_SUBST([HAVE_FREXPF])
185 HAVE_HYPOTF=1; AC_SUBST([HAVE_HYPOTF])
186 HAVE_HYPOTL=1; AC_SUBST([HAVE_HYPOTL])
187 HAVE_ISNANF=1; AC_SUBST([HAVE_ISNANF])
188 HAVE_ISNAND=1; AC_SUBST([HAVE_ISNAND])
189 HAVE_ISNANL=1; AC_SUBST([HAVE_ISNANL])
190 HAVE_LDEXPF=1; AC_SUBST([HAVE_LDEXPF])
191 HAVE_LOGF=1; AC_SUBST([HAVE_LOGF])
192 HAVE_LOGL=1; AC_SUBST([HAVE_LOGL])
193 HAVE_LOG10F=1; AC_SUBST([HAVE_LOG10F])
194 HAVE_LOG10L=1; AC_SUBST([HAVE_LOG10L])
195 HAVE_LOG1P=1; AC_SUBST([HAVE_LOG1P])
196 HAVE_LOG1PF=1; AC_SUBST([HAVE_LOG1PF])
197 HAVE_LOG1PL=1; AC_SUBST([HAVE_LOG1PL])
198 HAVE_MODFF=1; AC_SUBST([HAVE_MODFF])
199 HAVE_MODFL=1; AC_SUBST([HAVE_MODFL])
200 HAVE_POWF=1; AC_SUBST([HAVE_POWF])
201 HAVE_REMAINDER=1; AC_SUBST([HAVE_REMAINDER])
202 HAVE_REMAINDERF=1; AC_SUBST([HAVE_REMAINDERF])
203 HAVE_RINT=1; AC_SUBST([HAVE_RINT])
204 HAVE_RINTL=1; AC_SUBST([HAVE_RINTL])
205 HAVE_SINF=1; AC_SUBST([HAVE_SINF])
206 HAVE_SINL=1; AC_SUBST([HAVE_SINL])
207 HAVE_SINHF=1; AC_SUBST([HAVE_SINHF])
208 HAVE_SQRTF=1; AC_SUBST([HAVE_SQRTF])
209 HAVE_SQRTL=1; AC_SUBST([HAVE_SQRTL])
210 HAVE_TANF=1; AC_SUBST([HAVE_TANF])
211 HAVE_TANL=1; AC_SUBST([HAVE_TANL])
212 HAVE_TANHF=1; AC_SUBST([HAVE_TANHF])
213 HAVE_DECL_ACOSL=1; AC_SUBST([HAVE_DECL_ACOSL])
214 HAVE_DECL_ASINL=1; AC_SUBST([HAVE_DECL_ASINL])
215 HAVE_DECL_ATANL=1; AC_SUBST([HAVE_DECL_ATANL])
216 HAVE_DECL_CBRTF=1; AC_SUBST([HAVE_DECL_CBRTF])
217 HAVE_DECL_CBRTL=1; AC_SUBST([HAVE_DECL_CBRTL])
218 HAVE_DECL_CEILF=1; AC_SUBST([HAVE_DECL_CEILF])
219 HAVE_DECL_CEILL=1; AC_SUBST([HAVE_DECL_CEILL])
220 HAVE_DECL_COPYSIGNF=1; AC_SUBST([HAVE_DECL_COPYSIGNF])
221 HAVE_DECL_COSL=1; AC_SUBST([HAVE_DECL_COSL])
222 HAVE_DECL_EXPL=1; AC_SUBST([HAVE_DECL_EXPL])
223 HAVE_DECL_EXP2=1; AC_SUBST([HAVE_DECL_EXP2])
224 HAVE_DECL_EXP2F=1; AC_SUBST([HAVE_DECL_EXP2F])
225 HAVE_DECL_EXP2L=1; AC_SUBST([HAVE_DECL_EXP2L])
226 HAVE_DECL_EXPM1L=1; AC_SUBST([HAVE_DECL_EXPM1L])
227 HAVE_DECL_FLOORF=1; AC_SUBST([HAVE_DECL_FLOORF])
228 HAVE_DECL_FLOORL=1; AC_SUBST([HAVE_DECL_FLOORL])
229 HAVE_DECL_FREXPL=1; AC_SUBST([HAVE_DECL_FREXPL])
230 HAVE_DECL_LDEXPL=1; AC_SUBST([HAVE_DECL_LDEXPL])
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_LOGB=1; AC_SUBST([HAVE_DECL_LOGB])
237 HAVE_DECL_REMAINDER=1; AC_SUBST([HAVE_DECL_REMAINDER])
238 HAVE_DECL_REMAINDERL=1; AC_SUBST([HAVE_DECL_REMAINDERL])
239 HAVE_DECL_RINTF=1; AC_SUBST([HAVE_DECL_RINTF])
240 HAVE_DECL_ROUND=1; AC_SUBST([HAVE_DECL_ROUND])
241 HAVE_DECL_ROUNDF=1; AC_SUBST([HAVE_DECL_ROUNDF])
242 HAVE_DECL_ROUNDL=1; AC_SUBST([HAVE_DECL_ROUNDL])
243 HAVE_DECL_SINL=1; AC_SUBST([HAVE_DECL_SINL])
244 HAVE_DECL_SQRTL=1; AC_SUBST([HAVE_DECL_SQRTL])
245 HAVE_DECL_TANL=1; AC_SUBST([HAVE_DECL_TANL])
246 HAVE_DECL_TRUNC=1; AC_SUBST([HAVE_DECL_TRUNC])
247 HAVE_DECL_TRUNCF=1; AC_SUBST([HAVE_DECL_TRUNCF])
248 HAVE_DECL_TRUNCL=1; AC_SUBST([HAVE_DECL_TRUNCL])
249 REPLACE_CBRTF=0; AC_SUBST([REPLACE_CBRTF])
250 REPLACE_CBRTL=0; AC_SUBST([REPLACE_CBRTL])
251 REPLACE_CEIL=0; AC_SUBST([REPLACE_CEIL])
252 REPLACE_CEILF=0; AC_SUBST([REPLACE_CEILF])
253 REPLACE_CEILL=0; AC_SUBST([REPLACE_CEILL])
254 REPLACE_EXPM1=0; AC_SUBST([REPLACE_EXPM1])
255 REPLACE_EXPM1F=0; AC_SUBST([REPLACE_EXPM1F])
256 REPLACE_EXP2=0; AC_SUBST([REPLACE_EXP2])
257 REPLACE_EXP2L=0; AC_SUBST([REPLACE_EXP2L])
258 REPLACE_FABSL=0; AC_SUBST([REPLACE_FABSL])
259 REPLACE_FLOOR=0; AC_SUBST([REPLACE_FLOOR])
260 REPLACE_FLOORF=0; AC_SUBST([REPLACE_FLOORF])
261 REPLACE_FLOORL=0; AC_SUBST([REPLACE_FLOORL])
262 REPLACE_FMA=0; AC_SUBST([REPLACE_FMA])
263 REPLACE_FMAF=0; AC_SUBST([REPLACE_FMAF])
264 REPLACE_FMAL=0; AC_SUBST([REPLACE_FMAL])
265 REPLACE_FMOD=0; AC_SUBST([REPLACE_FMOD])
266 REPLACE_FMODF=0; AC_SUBST([REPLACE_FMODF])
267 REPLACE_FMODL=0; AC_SUBST([REPLACE_FMODL])
268 REPLACE_FREXPF=0; AC_SUBST([REPLACE_FREXPF])
269 REPLACE_FREXP=0; AC_SUBST([REPLACE_FREXP])
270 REPLACE_FREXPL=0; AC_SUBST([REPLACE_FREXPL])
271 REPLACE_HUGE_VAL=0; AC_SUBST([REPLACE_HUGE_VAL])
272 REPLACE_HYPOT=0; AC_SUBST([REPLACE_HYPOT])
273 REPLACE_HYPOTF=0; AC_SUBST([REPLACE_HYPOTF])
274 REPLACE_HYPOTL=0; AC_SUBST([REPLACE_HYPOTL])
275 REPLACE_ISFINITE=0; AC_SUBST([REPLACE_ISFINITE])
276 REPLACE_ISINF=0; AC_SUBST([REPLACE_ISINF])
277 REPLACE_ISNAN=0; AC_SUBST([REPLACE_ISNAN])
278 REPLACE_LDEXPL=0; AC_SUBST([REPLACE_LDEXPL])
279 REPLACE_LOG=0; AC_SUBST([REPLACE_LOG])
280 REPLACE_LOGF=0; AC_SUBST([REPLACE_LOGF])
281 REPLACE_LOGL=0; AC_SUBST([REPLACE_LOGL])
282 REPLACE_LOG10=0; AC_SUBST([REPLACE_LOG10])
283 REPLACE_LOG10F=0; AC_SUBST([REPLACE_LOG10F])
284 REPLACE_LOG10L=0; AC_SUBST([REPLACE_LOG10L])
285 REPLACE_LOG1P=0; AC_SUBST([REPLACE_LOG1P])
286 REPLACE_LOG1PF=0; AC_SUBST([REPLACE_LOG1PF])
287 REPLACE_LOG1PL=0; AC_SUBST([REPLACE_LOG1PL])
288 REPLACE_LOG2=0; AC_SUBST([REPLACE_LOG2])
289 REPLACE_LOG2F=0; AC_SUBST([REPLACE_LOG2F])
290 REPLACE_LOG2L=0; AC_SUBST([REPLACE_LOG2L])
291 REPLACE_LOGB=0; AC_SUBST([REPLACE_LOGB])
292 REPLACE_MODF=0; AC_SUBST([REPLACE_MODF])
293 REPLACE_MODFF=0; AC_SUBST([REPLACE_MODFF])
294 REPLACE_MODFL=0; AC_SUBST([REPLACE_MODFL])
295 REPLACE_NAN=0; AC_SUBST([REPLACE_NAN])
296 REPLACE_REMAINDER=0; AC_SUBST([REPLACE_REMAINDER])
297 REPLACE_REMAINDERF=0; AC_SUBST([REPLACE_REMAINDERF])
298 REPLACE_REMAINDERL=0; AC_SUBST([REPLACE_REMAINDERL])
299 REPLACE_ROUND=0; AC_SUBST([REPLACE_ROUND])
300 REPLACE_ROUNDF=0; AC_SUBST([REPLACE_ROUNDF])
301 REPLACE_ROUNDL=0; AC_SUBST([REPLACE_ROUNDL])
302 REPLACE_SIGNBIT=0; AC_SUBST([REPLACE_SIGNBIT])
303 REPLACE_SIGNBIT_USING_GCC=0; AC_SUBST([REPLACE_SIGNBIT_USING_GCC])
304 REPLACE_SQRTL=0; AC_SUBST([REPLACE_SQRTL])
305 REPLACE_TRUNC=0; AC_SUBST([REPLACE_TRUNC])
306 REPLACE_TRUNCF=0; AC_SUBST([REPLACE_TRUNCF])
307 REPLACE_TRUNCL=0; AC_SUBST([REPLACE_TRUNCL])
310 # gl_LONG_DOUBLE_VS_DOUBLE
311 # determines whether 'long double' and 'double' have the same representation.
312 # Sets variable HAVE_SAME_LONG_DOUBLE_AS_DOUBLE to 0 or 1, and defines
313 # HAVE_SAME_LONG_DOUBLE_AS_DOUBLE accordingly.
314 # The currently known platforms where this is the case are:
315 # Linux/HPPA, Minix 3.1.8, AIX 5, AIX 6 and 7 with xlc, MSVC 9.
316 AC_DEFUN([gl_LONG_DOUBLE_VS_DOUBLE],
318 AC_CACHE_CHECK([whether long double and double are the same],
319 [gl_cv_long_double_equals_double],
321 [AC_LANG_PROGRAM([[#include <float.h>]],
322 [[typedef int check[sizeof (long double) == sizeof (double)
323 && LDBL_MANT_DIG == DBL_MANT_DIG
324 && LDBL_MAX_EXP == DBL_MAX_EXP
325 && LDBL_MIN_EXP == DBL_MIN_EXP
328 [gl_cv_long_double_equals_double=yes],
329 [gl_cv_long_double_equals_double=no])
331 if test $gl_cv_long_double_equals_double = yes; then
332 AC_DEFINE([HAVE_SAME_LONG_DOUBLE_AS_DOUBLE], [1],
333 [Define to 1 if 'long double' and 'double' have the same representation.])
334 HAVE_SAME_LONG_DOUBLE_AS_DOUBLE=1
336 HAVE_SAME_LONG_DOUBLE_AS_DOUBLE=0
338 AC_SUBST([HAVE_SAME_LONG_DOUBLE_AS_DOUBLE])