[erlang-questions] Why do I have to recompile erl files

[Sverker Eriksson]

A new ERTS can usually load beam files compiled with an older compiler
at least a couple of major versions back.

An old ERTS may not be able to load beam files compiled with a newer compiler
as it may find futuristic instructions that it does not understand.

We usually only do such changes between major versions.


/Sverker, Erlang/OTP


On fre, 2019-02-22 at 12:14 -0500, Donald Steven wrote:
> Is it the case that beam files usually have to be recompiled when using 
> a newer OTP version?
> 
> On 2/21/2019 7.02 PM, Luke Bakken wrote:
> > 
> > Hi Donald,
> > 
> > I suspect the different Erlang versions are causing this. Sometimes
> > beam files are compatible, but I've found re-compilation is almost
> > always required when moving between major versions.
> > 
> > On Thu, Feb 21, 2019 at 3:46 PM Donald Steven <t6sn7gt@REDACTED> wrote:
> > > 
> > > My PC says: Erlang/OTP 20 [erts-0.9] [source] [64-bit] ...
> > > My laptop says: My PC says: Erlang/OTP 18- [erts-7.3] [source] [64-bit]
> > > ...
> > > 
> > > On 2/21/2019 1.53 PM, Luke Bakken wrote:
> > > > 
> > > > Hi Donald,
> > > > 
> > > > I'm curious to know what the error is, and if you're using the same
> > > > version of Erlang in both places.
> > > > 
> > > > On Thu, Feb 21, 2019 at 4:11 AM Donald Steven <t6sn7gt@REDACTED> wrote:
> > > > > 
> > > > > When I take my work from my desktop to my laptop I have to recompile
> > > > > some erl modules or I get an error (even though the beam files are
> > > > > present and where they need to be and they're both modern Intel
> > > > > Windows
> > > > > machines).  What's going on?
> > > > > 
> > > > > 
> > > > > Thanks.
> > > > > 
> > > > > 
> > > > > Don
> > > > > 
> > > > > 
> > > > > PS: I do use the WIndows Linux subsystem, but both computers are up to
> > > > > date so I don' think there is any difference there either.
> > > > > 
> > > > > 
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