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In the most recent compiler the C_F_POINTER function accepts the LOWER argument . I have used it, but I see that someting is wrong. The shape of the result is not equal to the shape as it was supplied when calling the function. I add a small example. Is this a compiler bug or do I miss something?
Robert
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It is a bug.
Intel Support team, this might be an issue with a naive implementation of the latest Fortran 2023 feature without any validation checking. It appears the upper bound of the result pointer that shall be an object defined by means of a Fortran processor gets set to -1 by Intel Fortran when lower bound is specified. Perhaps the Intel Fortran team will be interested in using another test case below?
use, intrinsic :: iso_c_binding, only : c_loc, c_f_pointer
blk1: block
character(len=:), allocatable, target :: x(:)
character(len=:), pointer :: y(:)
print *, "Block 1: intrinsic type character"
x = [ character(len=4) :: "How", "are", "you?" ]
call c_f_pointer( cptr=c_loc(x), fptr=y, shape=shape(x), lower=[ -1 ] )
print *, "lbound(y): ", lbound(y, dim=1), "; expected is -1"
print *, "ubound(y): ", ubound(y, dim=1), "; expected is 1"
print *, "y = ", y
end block blk1
print *
blk2: block
integer, target :: x(5)
integer, pointer :: y(:)
print *, "Block 2: intrinsic type integer"
x = [ 1, 2, 3, 4, 5 ]
call c_f_pointer( cptr=c_loc(x), fptr=y, shape=shape(x), lower=[ -2 ] )
print *, "lbound(y): ", lbound(y, dim=1), "; expected is -2"
print *, "ubound(y): ", ubound(y, dim=1), "; expected is 2"
print *, "y = ", y
end block blk2
print *
blk3: block
real, target :: x(7)
real, pointer :: y(:)
print *, "Block 3: intrinsic type real"
x = [( real(i), integer :: i = 1, size(x) )]
call c_f_pointer( cptr=c_loc(x), fptr=y, shape=shape(x), lower=[ -3 ] )
print *, "lbound(y): ", lbound(y, dim=1), "; expected is -3"
print *, "ubound(y): ", ubound(y, dim=1), "; expected is 3"
print *, "y = ", y
end block blk3
end
C:\Temp>ifx /standard-semantics /free p.f
Intel(R) Fortran Compiler for applications running on Intel(R) 64, Version 2024.1.0 Build 20240308
Copyright (C) 1985-2024 Intel Corporation. All rights reserved.
Microsoft (R) Incremental Linker Version 14.36.32537.0
Copyright (C) Microsoft Corporation. All rights reserved.
-out:p.exe
-subsystem:console
p.obj
C:\Temp>p.exe
Block 1: intrinsic type character
lbound(y): -1 ; expected is -1
ubound(y): -1 ; expected is 1
y =
Block 2: intrinsic type integer
lbound(y): -2 ; expected is -2
ubound(y): -1 ; expected is 2
y = 1 2
Block 3: intrinsic type real
lbound(y): -3 ; expected is -3
ubound(y): -1 ; expected is 3
y = 1.000000 2.000000 3.000000
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Thank you for reporting this,@Robert_van_Amerongen. Thanks, too, for the small reproducer.
Thank you, @FortranFan, for another reproducer! The Fortran compiler engineers appreciate that!
I file a bug report, CMPLRLLVM-57611, and included both reproducers. We'll let you know its progress to a fix.
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Barbara and FortranFan,
thanks for your help.
Robert
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Good news! The Fortran compiler team got right on this! Look for the fix in the 2024.2 release planned for mid-2024.
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That is nice to read.
Tanks to te team.
And for you to let me know.
Robert
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