External data
External data in a C routine can be shared with a common block
of the same name in a Fortran routine in the same load module under
the following conditions:
- The C static data is declared outside of any functions
- The C external data is NORENT, either from compiling the source file as NORENT, or by marking the variable as NORENT with #pragma variable(xxxx, NORENT).
- The Fortran static common blocks are either used only with one load
module in an application or they are declared as private common blocks.
A private common block is not shared across load modules and must
by created in any of the following ways:
- Specified or implied by the PC compiler option
- Referenced by Fortran object code produced by the VS FORTRAN Version 2 Release 4 compiler or earlier
- In an application that executes with the PC runtime option.