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Jonathan Wakely 41c3db9f28 PR libstdc++/85672 #undef _GLIBCXX_USE_FLOAT128 when not supported 
Restore the behaviour in GCC 8 and earlier where _GLIBCXX_USE_FLOAT128
is not defined when configure detects support is missing. This avoids
having three states where the macro is either 1, 0, or undefined.

	PR libstdc++/85672
	* include/Makefile.am [!ENABLE_FLOAT128]: Change c++config.h entry
	to #undef _GLIBCXX_USE_FLOAT128 instead of defining it to zero.
	* include/Makefile.in: Regenerate.
	* include/bits/c++config (_GLIBCXX_USE_FLOAT128): Move definition
	within conditional block.

From-SVN: r260043
 		2018-05-08 14:05:04 +01:00
..
backward PR libstdc++/69608 Move semantics for strstreambuf 2018-05-02 17:25:44 +01:00
bits PR libstdc++/85672 #undef _GLIBCXX_USE_FLOAT128 when not supported 2018-05-08 14:05:04 +01:00
c Update copyright years. 2018-01-03 11:03:58 +01:00
c_compatibility Update copyright years. 2018-01-03 11:03:58 +01:00
c_global PR libstdc++/84773 use aligned alloc functions for FreeBSD and MinGW cross-compilers 2018-03-12 22:52:16 +00:00
c_std Update copyright years. 2018-01-03 11:03:58 +01:00
debug re PR libstdc++/84998 (std::hash<std::bitset<N>> fails in Debug Mode) 2018-03-20 21:45:14 +00:00
decimal Update copyright years. 2018-01-03 11:03:58 +01:00
experimental PR libstdc++/85671 allow copy elision in path concatenation 2018-05-07 18:26:28 +01:00
ext aligned_buffer.h [...] (template<> __aligned_buffer): Define as __aligned_membuf alias. 2018-02-20 20:51:44 +00:00
parallel Update copyright years. 2018-01-03 11:03:58 +01:00
precompiled Update copyright years. 2018-01-03 11:03:58 +01:00
profile Update copyright years. 2018-01-03 11:03:58 +01:00
std Rollback bad commits! Sorry! 2018-05-07 16:13:48 +00:00
tr1 Rollback bad commits! Sorry! 2018-05-07 16:13:48 +00:00
tr2 Update copyright years. 2018-01-03 11:03:58 +01:00
Makefile.am PR libstdc++/85672 #undef _GLIBCXX_USE_FLOAT128 when not supported 2018-05-08 14:05:04 +01:00
Makefile.in PR libstdc++/85672 #undef _GLIBCXX_USE_FLOAT128 when not supported 2018-05-08 14:05:04 +01:00