[PATCH] libstdc++: Fix exceptions being generated when compiling with -fno-exceptions

[Jonathan Wakely]

On 14/04/15 12:17 -0300, Federico Lenarduzzi wrote:
>When the libstdc++ is compiled, the compiler sets the std::terminate_handler function with __verbose_terminate_handler() or std::abort() depending on _GLIBCXX_HOSTED && _GLIBCXX_VERBOSE being true or false.
>
>However, even if we compile with -fno-exceptions, the compiler will use __verbose_terminate_handler(), which uses exceptions. Therefore, the library is not fully exception-free.
>
>This patch adds a check for __EXCEPTIONS to the #if _GLIBCXX_HOSTED && _GLIBCXX_VERBOSE condition. If __EXCEPTIONS is defined, the compiler will use __verbose_terminate_handler() as a termination function; otherwise it'll use std::abort() which doesn't have exceptions. It also makes std::uncaught_exception() throw() return false if __EXCEPTIONS is not defined.

I've committed this slightly revised version using __cpp_exceptions
instead, and changing the new std::uncaught_exceptions() function too.

Tested x86_64-linux and powerpc64le-linux, and also built with
--enable-libstdcxx-flags=-fno-exceptions on x86_64-linux.

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