我正在尝试使用此命令生成c程序的PDG
frama-c -machdep x86_64 -pdg -cpp-command 'gcc -C -E -std=c99 -I. ' try.c
但我收到以下错误
[kernel] preprocessing with "gcc -C -E -std=c99 -I. try.c"
/usr/include/x86_64-linux-gnu/bits/byteswap.h:47:[kernel] warning: Calling undeclared function __builtin_bswap32. Old style K&R code?
/usr/include/x86_64-linux-gnu/bits/byteswap.h:111:[kernel] warning: Calling undeclared function __builtin_bswap64. Old style K&R code?
/usr/include/x86_64-linux-gnu/bits/fcntl-linux.h:316:[kernel] user error: Length of array is zero. This extension is unsupported
[kernel] user error: skipping file "try.c" that has errors.
[kernel] Frama-C aborted: invalid user input.
我该如何解决这个问题? 更新: C代码是
#include<stdio.h>
int main()
{
int n,m;
int i,j;
int flag=1;
scanf("%d%d",&n,&m);
int a[n][m];
for(i=0;i<n;i++)
{
for(j=0;j<m;j++)
{
scanf("%d",&a[i][j]);
}
}
for(i=0;i<n-1;i++)
{
if(a[i][0]==a[i+1][0])
{
flag=0;
break;
}
for(j=0;j<m-1;j++)
{
if(a[i][j]!=a[i][j])
{
flag=0;
break;
}
}
if(flag==1)
{
continue;
}
else
break;
}
if(flag==1)
printf("YES");
else
printf("NO");
return 0;
}
使用的frama-c版本是
版本:Fluorine-20130601编译日期:2013年12月23日星期一22:50:26 UTC
共享路径:/ usr / share / frama-c(可能会被FRAMAC_SHARE变量覆盖)
库路径:/ usr / lib / frama -c(可以用FRAMAC_LIB变量覆盖)
插件路径:/ usr / lib / frama -c / plugins(可以用FRAMAC_PLUGIN变量覆盖)
答案 0 :(得分:2)
自Frama-C Aluminum(2016年5月发布)以来,支持零长度阵列。这是Changelog的相关摘录:
-! Cil [2015/12/02] Changes in the handling of incomplete structs and
zero-length arrays. Initialization of incomplete (completely
undefined) structs is now duly rejected. Several compiler
extensions to the C99 standard (empty initializers,
zero-length arrays, etc.) now require a GCC or MSVC machdep
(e.g. -machdep gcc_x86_32).
如上所述,您应该使用GCC machdep,即gcc_x86_64
。