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Re: [PATCH 1/3] Do not use __builtin_types_compatible_p in C++ mode (bug 21930)

From: Joseph Myers <joseph at codesourcery dot com>
To: "Gabriel F. T. Gomes" <gftg at linux dot vnet dot ibm dot com>
Cc: <libc-alpha at sourceware dot org>
Date: Tue, 15 Aug 2017 19:56:44 +0000
Subject: Re: [PATCH 1/3] Do not use __builtin_types_compatible_p in C++ mode (bug 21930)
Authentication-results: sourceware.org; auth=none
References: <20170815174501.4143-1-gftg@linux.vnet.ibm.com> <20170815174501.4143-2-gftg@linux.vnet.ibm.com>

On Tue, 15 Aug 2017, Gabriel F. T. Gomes wrote:

> The logic to define isinf for float128 depends on the availability of
> __builtin_types_compatible_p, which is only available in C mode,
> however, the conditionals do not check for C or C++ mode.  This lead to
> an error in libstdc++ configure, as reported by bug 21930.
> 
> This patch adds a conditional for C mode in the definition of isinf for
> float128.  No definition is provided in C++ mode, since libstdc++
> headers undefine isinf.

OK.

-- 
Joseph S. Myers
joseph@codesourcery.com

Follow-Ups:
- Re: [PATCH 1/3] Do not use __builtin_types_compatible_p in C++ mode (bug 21930)
  - From: Gabriel F. T. Gomes

References:
- [PATCH 0/3] Fix math.h uses of C++ features
  - From: Gabriel F. T. Gomes
- [PATCH 1/3] Do not use __builtin_types_compatible_p in C++ mode (bug 21930)
  - From: Gabriel F. T. Gomes

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