[PATCHv2] PR libstdc++/84654 Do not use __float128 if it is disabled by the compiler

[Tulio Magno Quites Machado Filho]

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Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com> writes:

> Changes since v1:
>  - Completely rewrite of the patch to set ENABLE_FLOAT128 at libstdc++
>    build time and undef _GLIBCXX_USE_FLOAT128 when building user code.
>
> --- 8< ---
>
> In order to use __float128 in C++ it's necessary to check if the
> compiler enabled its support too when building user code.
> This patch changes the behavior at libstdc++ build by setting
> ENABLE_FLOAT128, which is used to set the value of the exported macro
> _GLIBCXX_USE_FLOAT128.
>
> 2018-03-12  Tulio Magno Quites Machado Filho  <tuliom@linux.vnet.ibm.com>
>
> 	PR libstdc++/84654
> 	* acinclude.m4: Set ENABLE_FLOAT128 instead of _GLIBCXX_USE_FLOAT128.
> 	* config.h.in: Remove references to _GLIBCXX_USE_FLOAT128.
> 	* configure: Regenerate.
> 	* include/Makefile.am: Replace the value of _GLIBCXX_USE_FLOAT128
> 	based on ENABLE_FLOAT128.
> 	* include/Makefile.in: Regenerate.
> 	* include/bits/c++config: Define _GLIBCXX_USE_FLOAT128.
> 	[!defined(__FLOAT128__) && !defined(__SIZEOF_FLOAT128__)]: Undefine
> 	_GLIBCXX_USE_FLOAT128.

-- 
Tulio Magno