Internal compiler error with ichar intrinsic function

[whayek]

Hi,

I came across an internal compiler error with ifx v2024.2.1 20240711 when I tried to build a Fortran library that included code similar to this example:

program myprog
  ! Compiler detects argument error
  print *, ichar('xy')

  ! Compiler crashes
  print *, ichar(trim('xy'))
end program myprog

The "ichar" intrinsic function expects a length=1 character-type variable as input, and the ifx compiler correctly responds with

error #8042: This argument must be of type character and of length 1. ['xy']

in the first case. However, it crashes with this error message in the second case:

#0 0x000000000312d792
#1 0x0000000003191e57
#2 0x000000000317d936
#3 0x000000000309dbe3
#4 0x00000000030a3ac1
#5 0x00000000030b47f8
#6 0x00000000031a10fe
#7 0x0000000003169710
#8 0x00000000031c1176
#9 0x00000000031bcf5f
#10 0x00000000031e0f14
#11 0x00000000031e1495
#12 0x00000000031e3ed0
#13 0x00000000031e0f14
#14 0x00000000031de38a
#15 0x00000000031e0f14
#16 0x00000000030787c6
#17 0x0000000003078175
#18 0x000000000324df17
#19 0x00002aaaabac0590
#20 0x00002aaaabac0640 __libc_start_main + 128
#21 0x0000000002eb06ea

myprog.F90(7): error #5623: **Internal compiler error: internal abort** Please report this error along with the circumstances in which it occurred in a Software Problem Report. Note: File and line given may not be explicit cause of this error.
print *, ichar(trim('xy'))
-----------------^
compilation aborted for myprog.F90 (code 1)

The Intel Fortran Compiler Classic compiles the second case, and it will provide the "ichar" value of the first character of the string returned by the "trim" intrinsic function. Same for gfortran, but only if the argument of "trim" is a variable, otherwise its static code analyser will not accept case 2 either.

[Ron_Green · Accepted solution]

Thanks for sending this to us. The bug ID is CMPLRLLVM-62576

[Jan_Streffing]

Hey Ron,

I think I stumbled about the same issue in another example. The issue has been flagged as solved. Does that mean I have to switch to a newer version (I used an HPC module with Intel2023.2.1). What version shall I ask the HPC admins to upgrade to, in order to have the solution for the issue?

Best, Jan