gcc/testsuite/gfortran.dg/substr_6.f90

   1 ! { dg-do run }
   2 ! { dg-options "-std=legacy" }
   3 !
   4 ! Check that NULs don't mess up constant substring simplification
   5 CHARACTER(5), parameter :: c0(1) = (/ "123" // ACHAR(0) // "5" /)
   6 CHARACTER*5 c(1)
   7 CHARACTER(1), parameter :: c1(5) = (/ "1", "2", "3", ACHAR(0), "5" /)
   8
   9 c = c0(1)(-5:-8)
  10 if (c(1) /= "     ") call abort()
  11 c = (/ c0(1)(1:5) /)
  12 do i=1,5
  13    if (c(1)(i:i) /= c1(i)) call abort()
  14
  15    ! Make NULs visible (and avoid corrupting text output).
  16    if (c(1)(i:i) == ACHAR(0)) then
  17     print "(a,$)", "<NUL>"
  18   else
  19     print "(a,$)", c(1)(i:i)
  20   end if
  21 end do
  22
  23 print *, ""
  24
  25 end