gdb: Special Fortran Commands

 
 15.4.6.3 Special Fortran Commands
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 GDB has some commands to support Fortran-specific features, such as
 displaying common blocks.
 
 'info common [COMMON-NAME]'
      This command prints the values contained in the Fortran 'COMMON'
      block whose name is COMMON-NAME.  With no argument, the names of
      all 'COMMON' blocks visible at the current program location are
      printed.