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0acb8a2a | 1 | /* Properties of long double type. |
dff8da6b | 2 | Copyright (C) 2016-2024 Free Software Foundation, Inc. |
0acb8a2a JM |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
0acb8a2a JM |
18 | |
19 | /* This header is included by <sys/cdefs.h>. | |
20 | ||
21 | If long double is ABI-compatible with double, it should define | |
22 | __NO_LONG_DOUBLE_MATH to 1; otherwise, it should leave | |
23 | __NO_LONG_DOUBLE_MATH undefined. | |
24 | ||
25 | If this build of the GNU C Library supports both long double | |
26 | ABI-compatible with double and some other long double format not | |
27 | ABI-compatible with double, it should define | |
28 | __LONG_DOUBLE_MATH_OPTIONAL to 1; otherwise, it should leave | |
29 | __LONG_DOUBLE_MATH_OPTIONAL undefined. | |
30 | ||
31 | If __NO_LONG_DOUBLE_MATH is already defined, this header must not | |
32 | define anything; this is needed to work with the definition of | |
33 | __NO_LONG_DOUBLE_MATH in nldbl-compat.h. */ | |
34 | ||
35 | /* In the default version of this header, long double is | |
36 | ABI-compatible with double. */ | |
37 | #ifndef __NO_LONG_DOUBLE_MATH | |
38 | # define __NO_LONG_DOUBLE_MATH 1 | |
39 | #endif | |
e2239af3 PM |
40 | |
41 | /* The macro __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI is used to determine the | |
42 | choice of the underlying ABI of long double. It will always assume | |
43 | a constant value for each translation unit. | |
44 | ||
45 | If the value is non-zero, any API which is parameterized by the long | |
46 | double type (i.e the scanf/printf family of functions or the explicitly | |
47 | parameterized math.h functions) will be redirected to a compatible | |
48 | implementation using _Float128 ABI via symbols suffixed with ieee128. | |
49 | ||
50 | The mechanism this macro uses to acquire may be a function | |
51 | of architecture, or target specific options used to invoke the | |
52 | compiler. */ | |
53 | #define __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI 0 |