[Bug fortran/79430] [7 Regression] action of statement incorrectly optimised away

[juergen.reuter at desy dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79430

--- Comment #6 from Jürgen Reuter <juergen.reuter at desy dot de> ---
(In reply to Dominique d'Humieres from comment #5)
> What does --with-precision=extended?

It sets the default precision of real and complex floats (kind type parameter)
to 80 bit instead of 64 bit (double) or 128bit (quadruple) precision according
to:

  !!! available REAL kinds               ! prec.  ! ISO     ! C
  integer, parameter :: single    =  4   !  1.. 6 ! real32  ! c_float      
  integer, parameter :: double    =  8   !  7..15 ! real64  ! c_double     
  integer, parameter :: extended  = 10   ! 16..18 ! real128 ! c_long_double
  integer, parameter :: quadruple = 16   ! 19..33 ! -1      ! c_float128 

  integer, parameter :: default           = extended