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- /* Properties of long double type.
- Copyright (C) 2016-2026 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <https://www.gnu.org/licenses/>. */
- /* This header is included by <sys/cdefs.h>.
- If long double is ABI-compatible with double, it should define
- __NO_LONG_DOUBLE_MATH to 1; otherwise, it should leave
- __NO_LONG_DOUBLE_MATH undefined.
- If this build of the GNU C Library supports both long double
- ABI-compatible with double and some other long double format not
- ABI-compatible with double, it should define
- __LONG_DOUBLE_MATH_OPTIONAL to 1; otherwise, it should leave
- __LONG_DOUBLE_MATH_OPTIONAL undefined.
- If __NO_LONG_DOUBLE_MATH is already defined, this header must not
- define anything; this is needed to work with the definition of
- __NO_LONG_DOUBLE_MATH in nldbl-compat.h. */
- /* In the default version of this header, long double is
- ABI-compatible with double. */
- #ifndef __NO_LONG_DOUBLE_MATH
- # define __NO_LONG_DOUBLE_MATH 1
- #endif
- /* The macro __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI is used to determine the
- choice of the underlying ABI of long double. It will always assume
- a constant value for each translation unit.
- If the value is non-zero, any API which is parameterized by the long
- double type (i.e the scanf/printf family of functions or the explicitly
- parameterized math.h functions) will be redirected to a compatible
- implementation using _Float128 ABI via symbols suffixed with ieee128.
- The mechanism this macro uses to acquire may be a function
- of architecture, or target specific options used to invoke the
- compiler. */
- #define __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI 0
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