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glibc.10645
math-c++-compat.patch
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File math-c++-compat.patch of Package glibc.10645
2017-10-17 Romain Naour <romain.naour@gmail.com> (tiny change) [BZ #22296] * math/math.h: Let signbit use the builtin in C++ mode with gcc < 6.x 2017-10-03 Gabriel F. T. Gomes <gabriel@inconstante.eti.br> [BZ #22235] * sysdeps/ieee754/ldbl-96/bits/iscanonical.h (iscanonical): Provide a C++ implementation based on function overloading, rather than using __MATH_TG, which uses C-only builtins. * sysdeps/ieee754/ldbl-128ibm/bits/iscanonical.h (iscanonical): Likewise. 2017-09-22 Gabriel F. T. Gomes <gabriel@inconstante.eti.br> [BZ #22146] math/math.h: Let fpclassify use the builtin in C++ mode, even when optimazing for size. 2017-08-28 Gabriel F. T. Gomes <gftg@linux.vnet.ibm.com> [BZ #21930] * math/math.h [defined __cplusplus && defined __SUPPORT_SNAN__] (iszero): New C++ implementation that does not use fpclassify/__MATH_TG/__builtin_types_compatible_p, when signaling nans are enabled, since __builtin_types_compatible_p is a C-only feature. 2017-08-24 Gabriel F. T. Gomes <gftg@linux.vnet.ibm.com> * math/math.h [defined __cplusplus] (issignaling): In the long double case, call __issignalingl only if __NO_LONG_DOUBLE_MATH is not defined. Call __issignaling, otherwise. 2017-08-22 Gabriel F. T. Gomes <gftg@linux.vnet.ibm.com> * math/math.h [defined __cplusplus] (issignaling): Provide a C++ definition for issignaling that does not rely on __MATH_TG, since __MATH_TG uses __builtin_types_compatible_p, which is only available in C mode. 2017-08-18 Gabriel F. T. Gomes <gftg@linux.vnet.ibm.com> [BZ #21930] * math/math.h (isinf): Check if in C or C++ mode before using __builtin_types_compatible_p, since this is a C mode feature. 2017-08-18 Gabriel F. T. Gomes <gftg@linux.vnet.ibm.com> * misc/sys/cdefs.h (__HAVE_GENERIC_SELECTION): Define to 0, if in C++ mode. Index: glibc-2.26/math/math.h =================================================================== --- glibc-2.26.orig/math/math.h +++ glibc-2.26/math/math.h @@ -402,7 +402,13 @@ enum /* Return number of classification appropriate for X. */ # if __GNUC_PREREQ (4,4) && !defined __SUPPORT_SNAN__ \ - && !defined __OPTIMIZE_SIZE__ + && (!defined __OPTIMIZE_SIZE__ || defined __cplusplus) + /* The check for __cplusplus allows the use of the builtin, even + when optimization for size is on. This is provided for + libstdc++, only to let its configure test work when it is built + with -Os. No further use of this definition of fpclassify is + expected in C++ mode, since libstdc++ provides its own version + of fpclassify in cmath (which undefines fpclassify). */ # define fpclassify(x) __builtin_fpclassify (FP_NAN, FP_INFINITE, \ FP_NORMAL, FP_SUBNORMAL, FP_ZERO, x) # else @@ -412,6 +418,15 @@ enum /* Return nonzero value if sign of X is negative. */ # if __GNUC_PREREQ (6,0) # define signbit(x) __builtin_signbit (x) +# elif defined __cplusplus + /* In C++ mode, __MATH_TG cannot be used, because it relies on + __builtin_types_compatible_p, which is a C-only builtin. + The check for __cplusplus allows the use of the builtin instead of + __MATH_TG. This is provided for libstdc++, only to let its configure + test work. No further use of this definition of signbit is expected + in C++ mode, since libstdc++ provides its own version of signbit + in cmath (which undefines signbit). */ +# define signbit(x) __builtin_signbitl (x) # elif __GNUC_PREREQ (4,0) # define signbit(x) __MATH_TG ((x), __builtin_signbit, (x)) # else @@ -442,8 +457,12 @@ enum /* Return nonzero value if X is positive or negative infinity. */ # if __HAVE_DISTINCT_FLOAT128 && !__GNUC_PREREQ (7,0) \ - && !defined __SUPPORT_SNAN__ - /* __builtin_isinf_sign is broken for float128 only before GCC 7.0. */ + && !defined __SUPPORT_SNAN__ && !defined __cplusplus + /* Since __builtin_isinf_sign is broken for float128 before GCC 7.0, + use the helper function, __isinff128, with older compilers. This is + only provided for C mode, because in C++ mode, GCC has no support + for __builtin_types_compatible_p (and when in C++ mode, this macro is + not used anyway, because libstdc++ headers undefine it). */ # define isinf(x) \ (__builtin_types_compatible_p (__typeof (x), _Float128) \ ? __isinff128 (x) : __builtin_isinf_sign (x)) @@ -470,7 +489,32 @@ enum # include <bits/iscanonical.h> /* Return nonzero value if X is a signaling NaN. */ -# define issignaling(x) __MATH_TG ((x), __issignaling, (x)) +# ifndef __cplusplus +# define issignaling(x) __MATH_TG ((x), __issignaling, (x)) +# else + /* In C++ mode, __MATH_TG cannot be used, because it relies on + __builtin_types_compatible_p, which is a C-only builtin. On the + other hand, overloading provides the means to distinguish between + the floating-point types. The overloading resolution will match + the correct parameter (regardless of type qualifiers (i.e.: const + and volatile). */ +extern "C++" { +inline int issignaling (float __val) { return __issignalingf (__val); } +inline int issignaling (double __val) { return __issignaling (__val); } +inline int +issignaling (long double __val) +{ +# ifdef __NO_LONG_DOUBLE_MATH + return __issignaling (__val); +# else + return __issignalingl (__val); +# endif +} +# if __HAVE_DISTINCT_FLOAT128 +inline int issignaling (_Float128 __val) { return __issignalingf128 (__val); } +# endif +} /* extern C++ */ +# endif /* Return nonzero value if X is subnormal. */ # define issubnormal(x) (fpclassify (x) == FP_SUBNORMAL) @@ -484,15 +528,40 @@ enum # endif # else /* __cplusplus */ extern "C++" { +# ifdef __SUPPORT_SNAN__ +inline int +iszero (float __val) +{ + return __fpclassifyf (__val) == FP_ZERO; +} +inline int +iszero (double __val) +{ + return __fpclassify (__val) == FP_ZERO; +} +inline int +iszero (long double __val) +{ +# ifdef __NO_LONG_DOUBLE_MATH + return __fpclassify (__val) == FP_ZERO; +# else + return __fpclassifyl (__val) == FP_ZERO; +# endif +} +# if __HAVE_DISTINCT_FLOAT128 +inline int +iszero (_Float128 __val) +{ + return __fpclassifyf128 (__val) == FP_ZERO; +} +# endif +# else template <class __T> inline bool iszero (__T __val) { -# ifdef __SUPPORT_SNAN__ - return fpclassify (__val) == FP_ZERO; -# else return __val == 0; -# endif } +# endif } /* extern C++ */ # endif /* __cplusplus */ #endif /* Use IEC_60559_BFP_EXT. */ Index: glibc-2.26/misc/sys/cdefs.h =================================================================== --- glibc-2.26.orig/misc/sys/cdefs.h +++ glibc-2.26/misc/sys/cdefs.h @@ -464,17 +464,18 @@ # define __glibc_macro_warning(msg) #endif -/* Support for generic selection (ISO C11) is available in GCC since - version 4.9. Previous versions do not provide generic selection, - even though they might set __STDC_VERSION__ to 201112L, when in - -std=c11 mode. Thus, we must check for !defined __GNUC__ when - testing __STDC_VERSION__ for generic selection support. +/* Generic selection (ISO C11) is a C-only feature, available in GCC + since version 4.9. Previous versions do not provide generic + selection, even though they might set __STDC_VERSION__ to 201112L, + when in -std=c11 mode. Thus, we must check for !defined __GNUC__ + when testing __STDC_VERSION__ for generic selection support. On the other hand, Clang also defines __GNUC__, so a clang-specific check is required to enable the use of generic selection. */ -#if __GNUC_PREREQ (4, 9) \ - || __glibc_clang_has_extension (c_generic_selections) \ - || (!defined __GNUC__ && defined __STDC_VERSION__ \ - && __STDC_VERSION__ >= 201112L) +#if !defined __cplusplus \ + && (__GNUC_PREREQ (4, 9) \ + || __glibc_clang_has_extension (c_generic_selections) \ + || (!defined __GNUC__ && defined __STDC_VERSION__ \ + && __STDC_VERSION__ >= 201112L)) # define __HAVE_GENERIC_SELECTION 1 #else # define __HAVE_GENERIC_SELECTION 0 Index: glibc-2.26/sysdeps/ieee754/ldbl-128ibm/bits/iscanonical.h =================================================================== --- glibc-2.26.orig/sysdeps/ieee754/ldbl-128ibm/bits/iscanonical.h +++ glibc-2.26/sysdeps/ieee754/ldbl-128ibm/bits/iscanonical.h @@ -37,5 +37,22 @@ extern int __iscanonicall (long double _ conversion, before being discarded; in IBM long double, there are encodings that are not consistently handled as corresponding to any particular value of the type, and we return 0 for those. */ -# define iscanonical(x) __MATH_TG ((x), __iscanonical, (x)) -#endif +# ifndef __cplusplus +# define iscanonical(x) __MATH_TG ((x), __iscanonical, (x)) +# else +/* In C++ mode, __MATH_TG cannot be used, because it relies on + __builtin_types_compatible_p, which is a C-only builtin. On the + other hand, overloading provides the means to distinguish between + the floating-point types. The overloading resolution will match + the correct parameter (regardless of type qualifiers (i.e.: const + and volatile)). */ +extern "C++" { +inline int iscanonical (float __val) { return __iscanonicalf (__val); } +inline int iscanonical (double __val) { return __iscanonical (__val); } +inline int iscanonical (long double __val) { return __iscanonicall (__val); } +# if __HAVE_DISTINCT_FLOAT128 +inline int iscanonical (_Float128 __val) { return __iscanonicalf128 (__val); } +# endif +} +# endif /* __cplusplus */ +#endif /* __NO_LONG_DOUBLE_MATH */ Index: glibc-2.26/sysdeps/ieee754/ldbl-96/bits/iscanonical.h =================================================================== --- glibc-2.26.orig/sysdeps/ieee754/ldbl-96/bits/iscanonical.h +++ glibc-2.26/sysdeps/ieee754/ldbl-96/bits/iscanonical.h @@ -34,4 +34,21 @@ extern int __iscanonicall (long double _ conversion, before being discarded; in extended precision, there are encodings that are not consistently handled as corresponding to any particular value of the type, and we return 0 for those. */ -#define iscanonical(x) __MATH_TG ((x), __iscanonical, (x)) +#ifndef __cplusplus +# define iscanonical(x) __MATH_TG ((x), __iscanonical, (x)) +#else +/* In C++ mode, __MATH_TG cannot be used, because it relies on + __builtin_types_compatible_p, which is a C-only builtin. On the + other hand, overloading provides the means to distinguish between + the floating-point types. The overloading resolution will match + the correct parameter (regardless of type qualifiers (i.e.: const + and volatile)). */ +extern "C++" { +inline int iscanonical (float __val) { return __iscanonicalf (__val); } +inline int iscanonical (double __val) { return __iscanonical (__val); } +inline int iscanonical (long double __val) { return __iscanonicall (__val); } +# if __HAVE_DISTINCT_FLOAT128 +inline int iscanonical (_Float128 __val) { return __iscanonicalf128 (__val); } +# endif +} +#endif /* __cplusplus */
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