[cfe-dev] __attribute__((weak)) possible regression in clang 3.6 since 3.5

[Ben Pope]

Whilst compiling RxCpp with clang 3.6 I get this error (and lots more 
very similar):
`.text.startup' referenced in section `.text.startup' of 
CMakeFiles/rxcppv2_test.dir/home/ben/development/test/rxcpp/RxCpp/Rx/v2/test/subscriptions/subscription.cpp.o: 
defined in discarded section 
`.text.startup[_ZN5rxcpp22composite_subscription12shared_emptyE]' of 
CMakeFiles/rxcppv2_test.dir/home/ben/development/test/rxcpp/RxCpp/Rx/v2/test/subscriptions/subscription.cpp.o

shared_empty is declared like this, in a header file:
__attribute__((weak)) composite_subscription 
composite_subscription::shared_empty = 
composite_subscription(detail::tag_composite_subscription_empty());

I don't know if that's valid or not.  If it's not, what should it be? 
It compiles with gcc-4.9.2, gcc-4.6.3, clang-3.4 and clang-3.5, that I'm 
aware of.

Thanks,

Ben