https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90890
--- Comment #2 from Bharat Mahajan <bharat.mahajan at hotmail dot com> ---
(In reply to kargl from comment #1)
> (In reply to Bharat Mahajan from comment #0)
> > The following program fails with segfault:
> >
> > program test
> > implicit none
> > real, dimension(:), allocatable :: a
> > integer :: b
> >
> > a = [a, 2.0]
> > b = -100
> > end program test
> >
> > Compiled it without any option to gfortran on MingW (Win10). If you comment
> > out the line "b=-100" then it works! gfortran version:
> >
> > GNU Fortran (x86_64-posix-seh-rev0, Built by MinGW-W64 project) 8.1.0
>
> The code is invalid. In the expression 'a = [a, 2.0]'
> you reference 'a' on the RHS when it is undefined.
I forgot to mention that code runs with no issues with ifort. Second, then why
the following code works with gfortran?
---
program test
implicit none
real, dimension(:), allocatable :: a
integer :: b
a = [a, 2.0]
!b = -100
end program test
---
I am not sure I would say 'a' is not defined. It is not allocated yet, that is
what the code is trying to do. I have not checked the standards so not sure
that the code is trying to do something outside of that, but it works with
ifort without their extensions.
