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.