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powerpc: Fix the compiler type used with C++ when -mabi=ieeelongdouble

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When compiling C++ code with -mabi=ieeelongdouble, KCtype is
unavailable and the long double type should be used instead.

This is also providing macro __HAVE_FLOAT128_UNLIKE_LDBL in order to
identify the kind of long double type is being used in the current
compilation unit.
Notice that bits/floatn.h cannot benefit from the new macro due to order
of header inclusion.

	* bits/floatn-common.h: Define __HAVE_FLOAT128_UNLIKE_LDBL.
	* math/math.h: Restrict the prototype definition for the functions
	issignaling(_Float128) and iszero(_Float128); and template
	__iseqsig_type<_Float128>, from __HAVE_DISTINCT_FLOAT128 to
	__HAVE_FLOAT128_UNLIKE_LDBL.
	* sysdeps/powerpc/bits/floatn.h [__HAVE_FLOAT128
	&& (!__GNUC_PREREQ (7, 0) || defined __cplusplus)
	&& __LDBL_MANT_DIG__ == 113]: Use long double suffix for
	__f128() constants; define the type _Float128 as long double;
	and reuse long double in __CFLOAT128.

Signed-off-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
This commit is contained in:
Tulio Magno Quites Machado Filho
2018-05-11 18:05:03 -03:00
parent b4d5b8b021
commit 5db7d705db
4 changed files with 43 additions and 13 deletions
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7
bits/floatn-common.h
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@@ -56,6 +56,13 @@
#define __HAVE_DISTINCT_FLOAT64X 0
#define __HAVE_DISTINCT_FLOAT128X __HAVE_FLOAT128X
/* Defined to 1 if the corresponding _FloatN type is not binary compatible
with the corresponding ISO C type in the current compilation unit as
opposed to __HAVE_DISTINCT_FLOATN, which indicates the default types built
in glibc. */
#define __HAVE_FLOAT128_UNLIKE_LDBL (__HAVE_DISTINCT_FLOAT128 \
&& __LDBL_MANT_DIG__ != 113)
/* Defined to 1 if any _FloatN or _FloatNx types that are not
ABI-distinct are however distinct types at the C language level (so
for the purposes of __builtin_types_compatible_p and _Generic). */