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there appears to be a regression in revision 1.5.2rc3r24441.
The attached program crashes even with 1 PE with:
Default real, digits: 4 24
Real kind, digits: 8 53
Integer kind, bits: 8 64
Default Integer : 4 32
Sum[real]: 1.0000000 2.0000000 3.0000000
Sum[real(8)]: 1.0000000000000000 2.0000000000000000
Sum[integer(4)]: 1 2 3
[proton:24826] *** An error occurred in MPI_Allreduce: the reduction
operation MPI_SUM is not defined on the MPI_INTEGER8 datatype
On the other hand,
% ompi_info --arch
Configured architecture: i686-pc-linux-gnu
% ompi_info --all |grep 'integer'
Fort have integer4: yes
Fort have integer8: yes
Fort integer4 size: 4
Fort integer8 size: 8
Fort integer4 align: 4
Fort integer8 align: 8
There are no problems with 1.4.x and earlier revisions.