用户错误：在why3.conf

问题描述

我正在尝试使用Frama-c测试功能：

/*@
    ensures \result >= x && \result >= y;
    ensures \result == x || \result == y;
*/

int max( int x,int y){
    return (x>y) ? x : y;
}

安装所有要求后：OPAM，why3，alt-ergo 每当我执行 frama-c -wp fct.c 时，我都会收到：

[kernel] Parsing fct.c (with preprocessing)
[wp] Warning: Missing RTE guards
[wp] User Error: Prover 'alt-ergo' not found in why3.conf
[wp] Goal typed_max_ensures : not tried
[wp] Goal typed_max_ensures_2 : not tried
[wp] User Error: Deferred error message was emitted during execution. 
See above messages for more information.
[kernel] Plug-in wp aborted: invalid user input.

解决方法

如Frama-C's installation instructions中所述，必须通过why3命令将why3 config --detect明确配置为检查可用的证明（请注意，这取决于所安装的Why3的确切版本，您也可以改用why3 config --full-config。您应该看到类似以下的输出：

Found prover Alt-Ergo version 2.0.0,OK.
... possibly other provers if you have installed them
Save config to /PATH/TO/HOME/.why3.conf

之后，您将可以使用Frama-C / WP中的证明

alt-ergo frama-c why3