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GNU Info (g77-295.info)Debugging and InterfacingDebugging and Interfacing ************************* GNU Fortran currently generates code that is object-compatible with the `f2c' converter. Also, it avoids limitations in the current GBE, such as the inability to generate a procedure with multiple entry points, by generating code that is structured differently (in terms of procedure names, scopes, arguments, and so on) than might be expected. As a result, writing code in other languages that calls on, is called by, or shares in-memory data with `g77'-compiled code generally requires some understanding of the way `g77' compiles code for various constructs. Similarly, using a debugger to debug `g77'-compiled code, even if that debugger supports native Fortran debugging, generally requires this sort of information. This section describes some of the basic information on how `g77' compiles code for constructs involving interfaces to other languages and to debuggers. *Caution:* Much or all of this information pertains to only the current release of `g77', sometimes even to using certain compiler options with `g77' (such as `-fno-f2c'). Do not write code that depends on this information without clearly marking said code as nonportable and subject to review for every new release of `g77'. This information is provided primarily to make debugging of code generated by this particular release of `g77' easier for the user, and partly to make writing (generally nonportable) interface code easier. Both of these activities require tracking changes in new version of `g77' as they are installed, because new versions can change the behaviors described in this section.
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