On Thu, Jun 18, 2020 at 5:31 AM Richard W.M. Jones <rjo...@redhat.com> wrote:
> I was trying to run through the tutorial here:
>
>   https://allan-blanchard.fr/publis/frama-c-wp-tutorial-en.pdf
>
> The first example on page 15 & 16 fails with:
>
>   [wp] Running WP plugin...
>   [wp] User Error: Prover 'alt-ergo' not found in why3.conf
>
> I couldn't get any further.  What I tried was:
>
>  - Install both why3 and alt-ergo.  Why aren't they deps of frama-c?

Historically, they were not required for frama-c to do something
useful.  The WP plugin needs them, but frama-c can be used in other
ways.

However, I see that frama-c's opam file lists both of them as
non-optional "depends", so I will make them Requires for the next
frama-c build.  (Note that alt-ergo is a Suggests already.)

>  - Run /usr/lib64/why3/commands/why3config by hand (why isn't it in
>    /usr/bin?), which creates $HOME/.why3.conf

I see you figured this one out already.

>  - stracing the program, it seems like it never attempts to
>    open or run anything to do with alt.*ergo

I see this in the log:

[wp] User Error: Prover 'alt-ergo' not found in why3.conf

which is a lie.  Prover alt-ergo is most definitely listed in
why3.conf.  I'll debug this.  Stand by.
-- 
Jerry James
http://www.jamezone.org/
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