[erlang-questions] more than 2 nifs in an app. total screw up?

[Loïc Hoguin]

If that's on OSX you need the -dynamiclib flag, otherwise functions with 
the same name will get overwritten when the second library is loaded, 
and this can result in this kind of behavior.

On 03/04/2018 04:20 AM, Vans S wrote:
> When I load more than 2 nifs in an app, I get total undefined defined 
> behavior depending which nif loaded first. Like everything is totally 
> messed up.
> 
> Example:
> 
> LD_PRELOAD="/nif1,so /nif2.so" rebar3 shell
> 
> nif1 works, nif2 is totally messed ,and randomly segfaults or gives 
> errorneous results.
> 
> LD_PRELOAD="/nif2,so /nif1.so" rebar3 shell
> 
> Now nif2 works, and nif1 is erroneous.
> 
> 
> Iv noticed this behavior before I recall, but now its resulted in so 
> much frustration. Things were crashing in C++ boost side like
> 
> mystruct v = boost::value_initialized<decltype(v)>();
> 
> Crash here with "terminate called after throwing an instance of 
> 'std::bad_alloc'". Switch the order of the nifs and it works fine.
> 
> 
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-- 
Loïc Hoguin
https://ninenines.eu