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GNU Info (g77-295.info)Variables Assumed To Be SavedVariables Assumed To Be Saved ----------------------------- Many Fortran programs were developed on systems that saved the values of all, or some, variables and arrays across procedure calls. As a result, many of these programs depend, sometimes inadvertently, on being able to assign a value to a variable, perform a `RETURN' to a calling procedure, and, upon subsequent invocation, reference the previously assigned variable to obtain the value. They expect this despite not using the `SAVE' statement to specify that the value in a variable is expected to survive procedure returns and calls. Depending on variables and arrays to retain values across procedure calls without using `SAVE' to require it violates the Fortran standards. You can ask `g77' to assume `SAVE' is specified for all relevant (local) variables and arrays by using the `-fno-automatic' option. Note that a program that works better when compiled with the `-fno-automatic' option is almost certainly depending on not having to use the `SAVE' statement as required by the Fortran standard. It might be worthwhile finding such cases and fixing them, using techniques such as compiling with the `-O -Wuninitialized' options using `g77'. automatically generated by info2www version 1.2.2.9 |