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Bug? Strange error raised by `ifort -check shape`

Zaikun
New Contributor I
2,161 Views

Hello!

 

I have encountered a strange error raised by `ifort -check shape` with `ifort (IFORT) 2021.2.0 20210228`. Here is a minimal working example.

! testshape.f90
program testshape
implicit none
integer :: a(1, 2)
a(:, 1:2) = a(:, 1:2) ! This line is OK. Benchmark for the erroneous line.
a(:, [1, 2]) = a(:, [1, 2]) ! Do nothing ..., but it triggers the error.
end program testshape

Name this code as `testshape.f90`, and then compile it. Here is what happens on my machine (Ubuntu 20.04).

```
$ ifort -check shape testshape.f90
testshape.f90(7): error #5581: Shape mismatch: The extent of dimension 1 of array A is 1 and the corresponding extent of array <RHS expression> is 2
a(:, [1, 2]) = a(:, [1, 2]) ! Do nothing ..., but it triggers the error.
^
compilation aborted for testshape.f90 (code 1)
```

If we remove `-check shape` or replace it with `-warn shape`, then everything works.

Did I misunderstand array indexing or miscalculate something in the code? Thank you for your attention.

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Devorah_H_Intel
Moderator
1,398 Views

The fix is coming in the next Intel Fortran Compiler release 2021.7

View solution in original post

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mecej4
Honored Contributor III
2,023 Views

Some characters in the code part of your post have disappeared. Please edit your post and display the code using the code button (click on ..., then on </>).

Zaikun
New Contributor I
1,987 Views
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mecej4
Honored Contributor III
1,935 Views

The bug is not present in older versions of Ifort, such as 2013SP1 and 2016.0.8.

Zaikun
New Contributor I
1,929 Views

> The bug is not present in older versions of Ifort, such as 2013SP1 and 2016.0.8.

Thank you for the verification. It seems that `-check shape` has not been available until 2018:

https://software.intel.com/content/www/us/en/develop/articles/array-shape-check-new-in-intel-fortran-compiler-190.html

Thank you.

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Zaikun
New Contributor I
1,854 Views

Hello,@VidyalathaB_Intel ! Sorry to bother you, but I do believe this is a bug. Thanks. 

 

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Barbara_P_Intel
Employee
1,818 Views

Thanks for reporting this. I filed a bug report on your behalf, CMPLRIL0-34245. I'll keep you posted on its progress to a fix.



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Devorah_H_Intel
Moderator
1,399 Views

The fix is coming in the next Intel Fortran Compiler release 2021.7

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