[Bug 1907812] Re: Can't build simple OpenMP offloading programs (needs -no-pie)

[Matthias Klose]

** Summary changed:

- Can't build simple OpenMP offloading programs on Ubuntu 20.10
+ Can't build simple OpenMP offloading programs (needs -no-pie)

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Title:
  Can't build simple OpenMP offloading programs (needs -no-pie)

Status in gcc-10 package in Ubuntu:
  New
Status in gcc-9 package in Ubuntu:
  New

Bug description:
  $cat prod.f90
  program main
    implicit none
    integer, parameter :: sp = selected_real_kind(6,37)
    integer, parameter :: n = 4096
    real(sp), allocatable :: a(:), b(:), c(:), c2(:)
    integer :: i

    allocate( a(n), b(n), c(n) )
    
    c = 0._sp
    call random_number(a)
    call random_number(b)

    !$omp target teams map(to: a, b) map(from: c)
    !$omp distribute parallel do
    do i = 1, n
      c(i) = a(i)*b(i)
    end do
    !$omp end target teams
    
    c2 = a*b
    
    print*, maxval( abs(c2-c) )
    
  end program

  $ gfortran -O3 -flto -fopenmp -foffload=nvptx-none prod.f90 -o test.x
  /usr/bin/ld: /tmp/ccyvMF16.crtoffloadtable.o: warning: relocation against `__offload_vars_end' in read-only section `.rodata'
  /usr/bin/ld: warning: creating DT_TEXTREL in a PIE

  Ubuntu 20.10 x86_64
  Xeon E3-1505m-v6
  Nvidia Quadro M2200

  That doesn't happen on Ubuntu 20.04

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