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In order to use the _GLIBCXX_NOEXCEPT_IF macro for an expression containing commas I enclosed it in parentheses, so the preprocessor wouldn't treat it as two arguments to the function-like macro. Clang gives an error because now the noexcept-specifier noexcept((C)) is not equivalent to the noexcept(C) one on the declaration of swap in <type_traits>. Instead of requiring extra parentheses around the expression, redefine _GLIBCXX_NOEXCEPT_IF as a variadic macro (even though supporting that in C++98 is a GNU extension). PR libstdc++/90314 * include/bits/c++config (_GLIBCXX_NOEXCEPT_IF): Use variadic macro. * include/bits/move.h (swap): Remove extra parentheses. From-SVN: r270827
file: libstdc++-v3/README New users may wish to point their web browsers to the file index.html in the 'doc/html' subdirectory. It contains brief building instructions and notes on how to configure the library in interesting ways.