我有一个应该给出细分错误的Fortran程序，但它没有 [英] I have a Fortran program that should give segmentation fault but it doesn't

问题描述

与标题一样简单.我有一个学生出现细分错误，我试图向他证明为什么会发生这种情况.相反，我最终想知道为什么不这样做.

As simple as the title. I have a student who got a segmentation fault and I was trying to prove him why does this happen. Instead, I ended up wondering why it doesn't.

代码是这样的:

program main                                                                                 
  implicit none                                                                              
  real*8, allocatable:: u(:)                                                                 
  integer :: i                                                                               
  allocate(u(2))                                                                             


  do i=0, 1000                                                                               
     u(i) = i                                                                                
     print *, u(i)                                                                           

  enddo                                                                                      

end program main

我希望它在 i = 3 时崩溃，但事实并非如此.与ifort和gfortran一起使用-O0到-O3编译

I would expect this to crash at i=3, but it doesn't. Compiled with both ifort and gfortran with -O0 to -O3

推荐答案

打开边界检查选项进行编译，然后向学生解释，如果额外的开销会导致段错误是越界访问的常见结果，那该怎么办?边界检查不到位?

What about turning on the bounds checking option for compilation and then explaining to the student that a seg fault is a common result for out of bounds access when the extra overhead for bounds checking is not in place?

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