double puzzle - precondition not proved using WP/Val plugin

ID0001664: This issue was created automatically from Mantis Issue 1664. Further discussion may take place here.

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Id	Project	Category	View	Due Date	Updated
ID0001664	Frama-C	Plug-in > Eva	public	2014-02-28	2014-06-06

Reporter	dharma	Assigned To	yakobowski	Resolution	no change required
Priority	normal	Severity	major	Reproducibility	always
Platform	Ubuntu	OS	Linux	OS Version	64 bit
Product Version	Frama-C Fluorine-20130601	Target Version	-	Fixed in Version	-

Description :

#include <stdio.h> #include <limits.h>

/*@ requires x != 0; assigns \nothing; */ void assert(int x);

int x = 0;

int main() { assert(x == (int)(double)x); return 0; }

Additional Information :

[kernel] preprocessing with "gcc -C -E -I. -dD double_casting_puzzle.c" [value] Analyzing an incomplete application starting at main [value] Computing initial state [value] Initial state computed [value] Values of globals at initialization x ∈ -..- [value] computing for function assert <- main. Called from double_casting_puzzle.c:13. [value] using specification for function assert double_casting_puzzle.c:4:[value] Function assert: precondition got status unknown. [value] Done for function assert [value] Recording results for main [value] done for function main [value] ====== VALUES COMPUTED ====== [value] Values at end of function main: __retres ∈ {0}

Steps To Reproduce :

frama-c -val double_casting_puzzle.c -pp-annot -lib-entry