gdb: Fortran

 
 15.4.6 Fortran
 --------------
 
 GDB can be used to debug programs written in Fortran, but it currently
 supports only the features of Fortran 77 language.
 
    Some Fortran compilers (GNU Fortran 77 and Fortran 95 compilers among
 them) append an underscore to the names of variables and functions.
 When you debug programs compiled by those compilers, you will need to
 refer to variables and functions with a trailing underscore.
 

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