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Clang does not currently support the __ibm128 type [1] and only supports the __ieee128 type in the unreleased 12.0.0 version [2]. That means it is not possible to provide support for -mabi=ieeelongdouble with Clang in an ABI compatible way (as we do for GCC by defining new facets and other types in the __gnu_cxx_ldbl128 namespace). By preventing the definition of _GLIBCXX_LONG_DOUBLE_ALT128_COMPAT when compiling with Clang, all uses of __ibm128 and __ieee128 types will be disabled. This can be revisited in future when Clang supports the types (and provides a way to detect that support using the preprocessor). [1] https://reviews.llvm.org/D93377 [2] https://reviews.llvm.org/D97846 libstdc++-v3/ChangeLog: * include/bits/c++config (_GLIBCXX_LONG_DOUBLE_ALT128_COMPAT): Do not define when compiling with Clang.
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