wp: the example from Getting Started guide doesn't work (all goals are Unknown)

ID0002261: This issue was created automatically from Mantis Issue 2261. Further discussion may take place here.

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Id	Project	Category	View	Due Date	Updated
ID0002261	Frama-C	Plug-in > wp	public	2016-12-14	2016-12-16

Reporter	vlad	Assigned To	virgile	Resolution	open
Priority	normal	Severity	minor	Reproducibility	always
Platform	Windows	OS	Windows 7	OS Version	-
Product Version	Frama-C 14-Silicon	Target Version	-	Fixed in Version	-

Description :

I'm trying to reproduce ASCL example from frama-c manual. For some reason all goals sent to alt-ergo end up with unknown result.

Code:

$ cat frama-c-test.c

/*@ requires \valid(a) && \valid(b); @ ensures A: *a == \old(*b); @ ensures B: *b == \old(*a); @ assigns *a,b; @/ void swap(int * a, int * b);

void swap(int *a,int *b) { int tmp = *a ; *a = *b ; *b = tmp ; return ; }

Frama-C result:

$ frama-c -wp -wp-rte frama-c-test.c [kernel] Parsing .opam/4.02.3+mingw32c/share/frama-c/libc/__fc_builtin_for_normalization.i (no preprocessing) [kernel] Parsing frama-c-test.c (with preprocessing) [wp] Running WP plugin... [rte] annotating function swap [wp] 4 goals scheduled [wp] [Alt-Ergo] Goal typed_swap_assert_rte_mem_access_4 : Unknown (65ms) [wp] [Alt-Ergo] Goal typed_swap_assert_rte_mem_access_3 : Unknown (64ms) [wp] [Alt-Ergo] Goal typed_swap_assert_rte_mem_access_2 : Unknown (61ms) [wp] [Alt-Ergo] Goal typed_swap_assert_rte_mem_access : Unknown (60ms) [wp] Proved goals: 0 / 4 Alt-Ergo: 0 (unknown: 4)

The exact same code works with Frama-C Aluminum on Linux. I'm running Frama-C on Windows 7 (with cygwin).

Additional Information :

$ alt-ergo -version 1.30

$ frama-c --version Silicon-20161101