[erlang-questions] Using the half-word emulator with the erlang-solutions ubuntu package

Konrad Gądek <>
Thu Apr 11 14:03:34 CEST 2013

I consulted the half-word emulator option: we shall have such packages (and others) in future, but this is not a priority and, I must admit, Karol and I have some other work to do now, so there's no deadline for that unfortunately.

In the meantime, if you need half-word emulator now, I'd suggest using kerl[1] to build your custom Erlang -- it's like rvm/virtualenv but for Erlang and it's easy to use (yes! 2 or so commands to build&install it!).
You shall add --enable-m64-build --disable-hipe --enable-halfword-emulator --with-ssl to KERL_CONFIGURE_OPTIONS (some more info here[2] and in the kerl readme[3]; ~/.kerlrc file I use for my projects is here: [4]; in ESL we don't use kerl).
Take a note that it's a known issue for kerl[5] to silently build Erlang without crypto - and probably everyone needs it (at least for rebar) - so keep an eye on that.

In case of any problems, don't hesitate to ask :)

[1] https://github.com/spawngrid/kerl
[2] http://www.erlang.org/doc/installation_guide/INSTALL.html#id62320
[3] https://github.com/spawngrid/kerl/blob/master/README.md
[4] http://pastebin.com/qWVC6rHr
[5] https://github.com/spawngrid/kerl/issues/31

/Konrad Gądek

----- Original Message -----
From: "pablo platt" <>
To: "Konrad Gądek" <>
Sent: Wednesday, April 10, 2013 9:02:48 PM
Subject: Re: [erlang-questions] Using the half-word emulator with the erlang-solutions ubuntu package

Is it possible to add a 64bit with half-word enabled and HiPE disabled package in addition to the 32bit and 64bit packages? 

Is there a chance HiPE and half-word will work together in a future release? 

Thank you for the packages. 
They are extremely helpful. 

On Wed, Apr 10, 2013 at 9:36 PM, Konrad Gądek <  > wrote: 


As far as I'm aware, we don't have half-word emulator enabled in our packages, so this seems like an erroneous statement on ESL website -- I'll investigate it more tomorrow. 

Both disabling HiPE and enabling half-word emulator are done while building packages. Some more info: http://stackoverflow.com/a/1185490/547223 

/Konrad Gądek 

----- Original Message ----- 
From: "pablo platt" <  > 
Sent: Wednesday, April 10, 2013 2:59:07 PM 
Subject: [erlang-questions] Using the half-word emulator with the erlang-solutions ubuntu package 


The page on the erlang-solutions website says that the packages support the half-word emulator: 
"These have included HiPE enabled, 32 and 64 bit configurations, alongside the half-word emulator" 

I see [hipe] when starting the shell so half-word is probably not enabled. 
I'm not using hipe so there is no problem disabling it. 

Do I need to set a flag when installing the deb package? 
Do I need to use a flag when starting erlang or creating a release with rebar in the vm.args? 

Are there reasons not to use half-word besides the 4GB process memory limit? 


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