Parallel Programming Guide for HP-UX Systems

MPI

Compiling and Linking

Chapter 2 19

If you want to use a compiler other than the default one assigned to each utility, set the

corresponding environment variables shown in Table 2-5.

Autodouble functionality

HP MPI 2.0 supports Fortran programs compiled 64-bit with any of the following options:

For HP-UX:

• +i8

• +r8

• +autodbl4

• +autodbl

For Linux Itanium2:

• -i2

Set default KIND of integer variables is 2.

• -i4

Set default KIND of integer variables is 4.

• -i8

Set default KIND of integer variables is 8.

• -r8

Set default size of REAL to 8 bytes.

• -r16

Set default size of REAL to 16 bytes.

• -autodouble

Table 2-5 Compilation environment variables

Utility Environment variable

mpicc MPI_CC

mpiCC MPI_CXX

mpif77 MPI_F77

mpif90 MPI_F90