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