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13c92696d2
When using compilers before GCC 7, include/float.h provides fallback definitions of FLT128_* constants. These definitions use 'Q' constant suffixes, which works for configurations with _Float128 ABI-distinct from long double, but not where it has the same ABI as long double. This patch changes the definitions to use the __f128 macro from <bits/floatn.h>, so allowing them to work in the non-distinct _Float128 case (where they are used in building glibc tests, not for building glibc itself) as well. Tested (a) with build-many-glibcs.py with GCC 6 (installed stripped shared libraries unchanged by the patch); (b) with build-many-glibcs.py with GCC 6 together with the main patch to enable float128 aliases; (c) for x86_64 with both GCC 6 and GCC 7. * include/float.h [!__GNUC_PREREQ (7, 0) && __HAVE_FLOAT128 && __GLIBC_USE (IEC_60559_TYPES_EXT)] (FLT128_MAX): Define using __f128. [!__GNUC_PREREQ (7, 0) && __HAVE_FLOAT128 && __GLIBC_USE (IEC_60559_TYPES_EXT)] (FLT128_EPSILON): Likewise. [!__GNUC_PREREQ (7, 0) && __HAVE_FLOAT128 && __GLIBC_USE (IEC_60559_TYPES_EXT)] (FLT128_MIN): Likewise. [!__GNUC_PREREQ (7, 0) && __HAVE_FLOAT128 && __GLIBC_USE (IEC_60559_TYPES_EXT)] (FLT128_TRUE_MIN): Likewise.
38 lines
1.1 KiB
C
38 lines
1.1 KiB
C
#ifndef _LIBC_FLOAT_H
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#define _LIBC_FLOAT_H
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#define __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION
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#include <bits/libc-header-start.h>
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#ifndef _ISOMAC
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# define __STDC_WANT_IEC_60559_TYPES_EXT__
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#endif
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#include_next <float.h>
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/* Supplement float.h macros for _Float128 for older compilers
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which do not yet support the type. These are described in
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TS 18661-3. */
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#include <features.h>
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#include <bits/floatn.h>
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#if !__GNUC_PREREQ (7, 0) \
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&& __HAVE_FLOAT128 && __GLIBC_USE (IEC_60559_TYPES_EXT)
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# define FLT128_MANT_DIG 113
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# define FLT128_DECIMAL_DIG 36
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# define FLT128_DIG 33
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# define FLT128_MIN_EXP (-16381)
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# define FLT128_MIN_10_EXP (-4931)
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# define FLT128_MAX_EXP 16384
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# define FLT128_MAX_10_EXP 4932
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# define FLT128_MAX \
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__f128 (1.18973149535723176508575932662800702e+4932)
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# define FLT128_EPSILON \
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__f128 (1.92592994438723585305597794258492732e-34)
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# define FLT128_MIN \
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__f128 (3.36210314311209350626267781732175260e-4932)
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# define FLT128_TRUE_MIN \
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__f128 (6.47517511943802511092443895822764655e-4966)
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#endif
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#endif /* _LIBC_FLOAT_H */
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