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Use __f128 to define FLT128_* constants in include/float.h for old GCC.

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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.
This commit is contained in:
Joseph Myers 2017-10-17 20:16:01 +00:00
parent 71d85045fd
commit 13c92696d2
2 changed files with 20 additions and 4 deletions
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12
ChangeLog
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@ -1,3 +1,15 @@
2017-10-17 Joseph Myers <joseph@codesourcery.com>
* 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.
2017-10-17 Adhemerval Zanella <adhemerval.zanella@linaro.org>
* bits/uio-ext.h (RWF_HIPRI, RWF_DSYNC, RWF_SYNC, RWF_NOWAIT): New

12
include/float.h
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@ -24,10 +24,14 @@
# define FLT128_MIN_10_EXP (-4931)
# define FLT128_MAX_EXP 16384
# define FLT128_MAX_10_EXP 4932
# define FLT128_MAX 1.18973149535723176508575932662800702e+4932Q
# define FLT128_EPSILON 1.92592994438723585305597794258492732e-34Q
# define FLT128_MIN 3.36210314311209350626267781732175260e-4932Q
# define FLT128_TRUE_MIN 6.47517511943802511092443895822764655e-4966Q
# define FLT128_MAX \
__f128 (1.18973149535723176508575932662800702e+4932)
# define FLT128_EPSILON \
__f128 (1.92592994438723585305597794258492732e-34)
# define FLT128_MIN \
__f128 (3.36210314311209350626267781732175260e-4932)
# define FLT128_TRUE_MIN \
__f128 (6.47517511943802511092443895822764655e-4966)
#endif
#endif /* _LIBC_FLOAT_H */