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Compiler does not report incorrect invocation of SHAPE()

 
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mecej4



Joined: 31 Oct 2006
Posts: 1897

PostPosted: Tue Feb 06, 2024 4:39 pm    Post subject: Compiler does not report incorrect invocation of SHAPE() Reply with quote

The SHAPE intrinsic function may not be applied to assumed-size subprogram arguments. The Fortran 2003 Standard says (emphasis added):

13.7.108 SHAPE (SOURCE [, KIND])
9 Description. Returns the shape of an array or a scalar.
10 Class. Inquiry function.
11 Arguments.
SOURCE may be of any type. It may be a scalar or an array. It shall not be an
unallocated allocatable or a pointer that is not associated. It shall not be an
12 assumed-size array.

Here is a test program where this requirement is not met, and the compiler does not report an error or warning:
Code:
program shapebug
   implicit none
   integer i,ki(10)
   ki = [(i+4, i=1,10)]
   print *,'Shape(ki) = ',shape(ki)
   call sub(ki)

   CONTAINS

   subroutine sub(ij)
      implicit none
      integer ij(*)
      print *,'In SUB, shape(arg) = ',shape(ij)
      return
   end subroutine sub
end program


The output from FTN95 (32-bit):
Code:
 Shape(ki) =           10
 In SUB, shape(arg) =     56687753


The output from FTN95 (64-bit):
Code:
 Shape(ki) =           10
 In SUB, shape(arg) =            1


A compile time warning or error message would be helpful.
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PaulLaidler
Site Admin


Joined: 21 Feb 2005
Posts: 8040
Location: Salford, UK

PostPosted: Wed Feb 07, 2024 8:15 am    Post subject: Reply with quote

mecej4

Many thanks for the welcome feedback. I have added this to the log.
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PaulLaidler
Site Admin


Joined: 21 Feb 2005
Posts: 8040
Location: Salford, UK

PostPosted: Wed Feb 07, 2024 9:16 am    Post subject: Reply with quote

An error report has been added for the next release of FTN95.
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