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The powerpc bits/floatn.h declares _Float128 support to be present when the compiler supports it for powerpc64le. However, in the case where -mlong-double-64 is used, __MATH_TG does not actually support _Float128; it only supports _Float128 in the distinct-long-double case. This shows up as a build failure when building glibc mainline with GCC mainline, given the recently added sanity check in math.h for configurations supported by __MATH_TG, as the compat code for -mlong-double-64 fails to build. However, the bug was logically present before that change (including in 2.26), just less visible. This patch fixes the build failure by declaring _Float128 to be unsupported in that case. (Of course this can't actually stop users calling the type-generic macros with _Float128 arguments with -mlong-double-64, just as they could be called with other unsupported types on other platforms, but perhaps makes it less likely by making all the type-specific _Float128 interfaces invisible in that case.) Tested compilation for powerpc64le with build-many-glibcs.py. [BZ #22402] * sysdeps/powerpc/bits/floatn.h: Include <bits/long-double.h>. [__NO_LONG_DOUBLE_MATH] (__HAVE_FLOAT128): Define to 0.
104 lines
3.6 KiB
C
104 lines
3.6 KiB
C
/* Macros to control TS 18661-3 glibc features on powerpc.
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Copyright (C) 2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _BITS_FLOATN_H
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#define _BITS_FLOATN_H
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#include <features.h>
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#include <bits/long-double.h>
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/* Defined to 1 if the current compiler invocation provides a
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floating-point type with the IEEE 754 binary128 format, and this glibc
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includes corresponding *f128 interfaces for it. */
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#if defined _ARCH_PWR8 && defined __LITTLE_ENDIAN__ && (_CALL_ELF == 2) \
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&& defined __FLOAT128__ && !defined __NO_LONG_DOUBLE_MATH
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# define __HAVE_FLOAT128 1
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#else
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# define __HAVE_FLOAT128 0
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#endif
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/* Defined to 1 if __HAVE_FLOAT128 is 1 and the type is ABI-distinct
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from the default float, double and long double types in this glibc. */
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#if __HAVE_FLOAT128
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# define __HAVE_DISTINCT_FLOAT128 1
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#else
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# define __HAVE_DISTINCT_FLOAT128 0
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#endif
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/* Defined to concatenate the literal suffix to be used with _Float128
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types, if __HAVE_FLOAT128 is 1. */
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#if __HAVE_FLOAT128
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# if !__GNUC_PREREQ (7, 0) || defined __cplusplus
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/* The literal suffix (f128) exist for powerpc only since GCC 7.0. */
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# define __f128(x) x##q
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# else
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# define __f128(x) x##f128
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# endif
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#endif
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/* Defined to a complex binary128 type if __HAVE_FLOAT128 is 1. */
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#if __HAVE_FLOAT128
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# if !__GNUC_PREREQ (7, 0) || defined __cplusplus
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/* Add a typedef for older GCC compilers which don't natively support
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_Complex _Float128. */
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typedef _Complex float __cfloat128 __attribute__ ((__mode__ (__KC__)));
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# define __CFLOAT128 __cfloat128
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# else
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# define __CFLOAT128 _Complex _Float128
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# endif
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#endif
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/* The remaining of this file provides support for older compilers. */
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#if __HAVE_FLOAT128
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/* The type _Float128 exist for powerpc only since GCC 7.0. */
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# if !__GNUC_PREREQ (7, 0) || defined __cplusplus
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typedef __float128 _Float128;
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# endif
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/* Builtin __builtin_huge_valf128 doesn't exist before GCC 7.0. */
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# if !__GNUC_PREREQ (7, 0)
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# define __builtin_huge_valf128() ((_Float128) __builtin_huge_val ())
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# endif
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/* The following builtins (suffixed with 'q') are available in GCC >= 6.2,
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which is the minimum version required for float128 support on powerpc64le.
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Since GCC 7.0 the builtins suffixed with f128 are also available, then
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there is no need to redefined them. */
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# if !__GNUC_PREREQ (7, 0)
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# define __builtin_copysignf128 __builtin_copysignq
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# define __builtin_fabsf128 __builtin_fabsq
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# define __builtin_inff128 __builtin_infq
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# define __builtin_nanf128 __builtin_nanq
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# define __builtin_nansf128 __builtin_nansq
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# endif
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/* In math/math.h, __MATH_TG will expand signbit to __builtin_signbit*,
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e.g.: __builtin_signbitf128, before GCC 6. However, there has never
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been a __builtin_signbitf128 in GCC and the type-generic builtin is
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only available since GCC 6. */
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# if !__GNUC_PREREQ (6, 0)
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# define __builtin_signbitf128 __signbitf128
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# endif
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#endif
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#include <bits/floatn-common.h>
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#endif /* _BITS_FLOATN_H */
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