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I have a program in mixed C++/Fortran, in which a C++ character is given as argument for a Fortran function.

The code is compiling and working with ifort compiler, using the option -mixed_str_len_arg, which specifies the position of the hidden length for character arguments (see https://software.intel.com/en-us/node/525960).

For some reason, I want to compile the code using gfortran, but did not find any equivalent option with this compiler. Are you aware of a similar option, or an other alternative?

Vladimir F Героям слава
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R. Gx
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1 Answers1

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There is no such flag available. The calling conventions are fixed and exactly specified in the manual https://gcc.gnu.org/onlinedocs/gfortran/Argument-passing-conventions.html

If you interact between C(++) and Fortran. it is better to use modern interoperability features. Fortran bind(C) procedures do not have any hidden arguments and you can define the function exactly as you need it.

Vladimir F Героям слава
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  • I suspect that a close search of SO will turn up a Q and A to guide OP in implementing this interaction. Not something I have time for right now. – High Performance Mark Jul 15 '16 at 11:01
  • Thanks for your reply Vladimir F, I wanted to avoid modifying the (old) fortran code, and therefore use the bind(C) procedure. But it looks like there is no turnaround. – R. Gx Jul 15 '16 at 11:13