To set a conditional watchpoint on local variable i.
Example Code:
subroutine func
integer :: i
do i=1, 100
write(*,*) i
end do
end subroutine
program test
implicit none
call func()
end program
Compile with -ggdb
Set a breakpoint on subroutine "func". After the debugger stop on this point, the local variable "i" is in scope so one can set a watchpoint.
$ gdb ./example
(gdb) break func
Breakpoint 1 at 0x8bb: file gdb.F90, line 4.
ODER
(gdb) break example.F90:4
(gdb) run
Starting program: /home/kater/example
Breakpoint 1, func () at example.F90:4
4 do i=1, 100
(gdb) watch i if i.gt.10
Hardware watchpoint 2: i
(gdb) c
continuing.
1
2
3
4
5
6
7
8
9
10
Hardware watchpoint 2: i
Old value = 10
New value = 11
0x0000555555554948 in func () at gdb.F90:4
4 do i=1, 100