libstdc++ PATCH to harmonize noexcept

[Jonathan Wakely]

On 01/12/17 15:32 +0000, Jonathan Wakely wrote:
>On 14/11/17 13:56 -0500, Jason Merrill wrote:
>>While working on an unrelated issue I noticed that the compiler didn't
>>like some of these declarations after preprocessing, when they aren't
>>protected by system-header permissiveness.
>>
>>I thought about limiting the permissiveness to only extern "C"
>>functions, but I believe that system headers are adding more C++
>>declarations, so we'd likely run into this issue again.
>>
>>Shouldn't we build libstdc++ with -Wsystem-headers?  Maybe along with
>>-Wno-error=system-headers?
>>
>>Jonathan approved these changes elsewhere.
>>
>>Jason
>
>>commit abe66184d116f85f10108191b081f48dd0cfe3aa
>>Author: Jason Merrill <jason@redhat.com>
>>Date:   Tue Nov 14 13:48:57 2017 -0500
>>
>>           Correct noexcept mismatch in declarations.
>>
>>           * include/bits/fs_ops.h (permissions): Add noexcept.
>>           * include/bits/fs_fwd.h (copy, copy_file): Remove noexcept.
>>           (permissions): Add noexcept.
>>           * include/std/string_view (find_first_of): Add noexcept.
>>
>
>There's another one needed too:
>
>--- a/libstdc++-v3/libsupc++/eh_throw.cc
>+++ b/libstdc++-v3/libsupc++/eh_throw.cc
>@@ -53,8 +53,10 @@ __gxx_exception_cleanup (_Unwind_Reason_Code code, _Unwind_Exception *exc)
>}
>
>extern "C" __cxa_refcounted_exception*
>-__cxxabiv1::__cxa_init_primary_exception(void *obj, std::type_info *tinfo,
>-                                         void (_GLIBCXX_CDTOR_CALLABI *dest) (void *))
>+__cxxabiv1::
>+__cxa_init_primary_exception(void *obj, std::type_info *tinfo,
>+                            void (_GLIBCXX_CDTOR_CALLABI *dest) (void *))
>+_GLIBCXX_NOTHROW
>{
>  __cxa_refcounted_exception *header
>    = __get_refcounted_exception_header_from_obj (obj);

Tested powerpc64le-linux and committed to trunk.

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