[Bug fortran/47267] array constructor causing long compile times

[burnus at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47267

Tobias Burnus <burnus at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |burnus at gcc dot gnu.org,
                   |                            |dfranke at gcc dot gnu.org,
                   |                            |jvdelisle at gcc dot
                   |                            |gnu.org

--- Comment #2 from Tobias Burnus <burnus at gcc dot gnu.org> 2011-01-12 13:51:43 UTC ---
You can use -fmax-array-constructor=<n> to tune this. However, I think
currently there is no distinction made between constructors which have to be be
run at compile time (a) and those which can be run at compile time (b).

<n> is currently 65535.


Example for (a): Parameter array or initialization expression

   INTEGER, PARAMETER :: Niter=30000000
   INTEGER, PARAMETER :: ARRAY(Niter) = (/(i,i=1,Niter)/)

Example for (b): Assignment to an array

   INTEGER, PARAMETER :: Niter=30000000
   INTEGER :: ARRAY(Niter)
   ARRAY(Niter) = (/(i,i=1,Niter)/)