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[Bug math/22700] New: typedef logic for _Float128 in bits/floatn.h only supports gcc
- From: "nszabolcs at gmail dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Thu, 11 Jan 2018 11:22:22 +0000
- Subject: [Bug math/22700] New: typedef logic for _Float128 in bits/floatn.h only supports gcc
- Auto-submitted: auto-generated
https://sourceware.org/bugzilla/show_bug.cgi?id=22700
Bug ID: 22700
Summary: typedef logic for _Float128 in bits/floatn.h only
supports gcc
Product: glibc
Version: 2.27
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: math
Assignee: unassigned at sourceware dot org
Reporter: nszabolcs at gmail dot com
Target Milestone: ---
on targets where long double has the right semantics the
public math header may typedef _Float128 even if the
compiler has its own _Float128 definition.
use
#if !defined __FLT128_MANT_DIG__ || defined __cplusplus
instead of
#if !__GNUC_PREREQ (7, 0) || defined __cplusplus
to check if compiler lacks _Float128 support since it
works for both gcc and clang.
clang trunk supports _Float128 since
https://reviews.llvm.org/D40673
but they don't seem to support the f128 constant suffix
(only q) nor the __builtin_inff128 etc builtins so a bit
more change is required to make the headers work with it,
and it's not clear how to check for those features
(other than ifdef __clang__), however changing the headers
to be able to work with other compilers is useful anyway.
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