gdb if condition syntax error

Question

I have a really simple Fortran program in a file test.f90:

program test
   real :: x
   x=12
   write(*,*) x
end program test

I compile it with

gfortran -g test.f90

Then I try with gdb:

gdb a.out
break 4 if a == 12

but I get

A syntax error in expression, near `= 12'.

I found several docs and forums saying this should work, but it doesn't... What is the correct syntax for this simple condition? I use gdb 7.6.1.

francescalus · Accepted Answer · 2017-10-19 12:40:41Z

8

The documentation for gdb has the following to say about Fortran support:

GDB can be used to debug programs written in Fortran, but it currently supports only the features of Fortran 77 language.

As the logical conditional x == 12 is Fortran 90 pedigree you can instead write

break 4 if x.eq.12

answered Oct 19, 2017 at 12:40

francescalus

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