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From: Christian Brembilla
Subject: GDB
Date: Sun, 7 Feb 2016 11:12:29 +0000

Dear all,

I am really new in Fortran and GDB.  So sorry if I am asking you some silly questions but I am stuck.


I want to explain to you every steps so there won´t be misleading.

I am running my program in F77 (Path=\F\G77\bin and library   path= \F\g77\lib slatec)

I have also download GNU but I used G77 since I found some practical examples on the net.


I am using the prompt from windows.

I believe that it can be useful a debugger with breakpoints so I can understand

where I am doing mistakes.


I download the GDB version gdb-7.10.1 but unfortunately I cannot understand

how can work. I mean in operative way. I looked at the pdf file gdb.pdf at the paragraph:

Getting In and Out of GDB.


Unfortunately when I am typing gdb at the prompt I got the

Gdb is not recognized as an internal or external command


Do I have to type some path? Which one?

Could you please provide me a practical example?


For instance, I can explain you what I am doing with Fortran in this way there are no doubts or



1.       I made a program as the program below:


File panel.for


program panel

implicit none

real tin, Qn, tex

read*, n, e, dt, Tmax


do i = 2, Tmax

    do j = 1, e


      if (j .GT. 1)  then

      tsu =tex(i,j-1)

       end if …

… end do

end do


2.       I compiled the program in the prompt by typing

C:\F\Panel>f2exe panel

C:\F\Panel> panel


From here my program start correctly by asking me some values.

But when it solves the nested loop I got some odd values  -1IND

A debugger may be useful to understand what is going on.

Best regards,




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