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Jonathan Wakely
authored
Recent changes to use __int128 as an integer-like type in <ranges> and to optimize std::uniform_int_distribution mean that the library relies on __int128 more heavily than in the past. The library expects that if __int128 is supported then either __GLIBCXX_TYPE_INT_N_0 is defined (and we treat is like the standard integer types), or __STRICT_ANSI__ is defined (and we need to add special handling for __int128 as a non-standard integer type). If users compile with -std=c++NN -U__STRICT_ANSI__ then it puts the library into a broken and inconsistent state, where the compiler doesn't define the __GLIBCXX_TYPE_INT_N_0 macro, but the library thinks it doesn't need special handling for __int128. What the user should do is compile with -std=gnu++NN instead. This adds a warning if it appears that __int128 is supported but neither __GLIBCXX_TYPE_INT_N_0 nor __STRICT_ANSI__ is defined. libstdc++-v3/ChangeLog: * include/bits/c++config: Warn if __STRICT_ANSI__ state is inconsistent with __GLIBCXX_TYPE_INT_N_0.