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Bug report in sdbg64 (version 8.70)

 
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Moji



Joined: 30 Sep 2020
Posts: 18

PostPosted: Thu Feb 25, 2021 6:00 pm    Post subject: Bug report in sdbg64 (version 8.70) Reply with quote

Hello,
There is a bug in sdbg64 (version 8.70), that I want to report.
I compiled the below code as a 64-bit program:
Code:

program Test_sdbg64
Implicit None

Character (LEN=24), External :: func
Character (LEN=40)           :: res
Character (LEN= 1)           :: lan

lan = 'E'
res = ' ' // func (lan)
write(*,*) res
end program


Function func (spr)
Implicit None

Character (LEN=24) :: func
Character (LEN= 1) :: spr

if (INDEX('Ee',spr) == 0) then    ! 64-bit Debugger doesn't work
! if (.FALSE.) then               ! 64-bit Debugger works
   func = 'Case A                  '
else
   func = 'Case B                  '
end if
end

When I open the 64-bit executable with the debugger and step into the func function, the curser goes directly to the end statement and it is not possible to put a breakpoint before that to follow the process.
However, when I switch between the if statements, i.e.:
Code:

! if (INDEX('Ee',spr) == 0) then    ! 64-bit Debugger doesn't work
if (.FALSE.) then               ! 64-bit Debugger works

the debugger behaves normal.
This is not the case with 32-bit version and the debugger starts from the start point of the fuction, as I step into it.
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mecej4



Joined: 31 Oct 2006
Posts: 1559

PostPosted: Thu Feb 25, 2021 6:13 pm    Post subject: Reply with quote

Perhaps you are using different DLLs than the ones that I have?

I compiled with /64 /debug and was able to step through as well as place a breakpoint on line-20. Everything looked normal!
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Robert



Joined: 29 Nov 2006
Posts: 390
Location: Manchester

PostPosted: Thu Feb 25, 2021 11:18 pm    Post subject: Reply with quote

Ensure you are using FTN95 8.70. Whether a line can be breakpointed is something the compiler determines (not sdbg64).
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Moji



Joined: 30 Sep 2020
Posts: 18

PostPosted: Fri Feb 26, 2021 8:36 am    Post subject: Reply with quote

I am using ftn95 version 8.70.393 and the silverfrost dlls are from 04.01.2021.
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PaulLaidler
Site Admin


Joined: 21 Feb 2005
Posts: 7089
Location: Salford, UK

PostPosted: Fri Feb 26, 2021 2:35 pm    Post subject: Reply with quote

Moji

Your sample works OK for me. If/when possible I will send you an updated FTN95.
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Moji



Joined: 30 Sep 2020
Posts: 18

PostPosted: Fri Feb 26, 2021 2:40 pm    Post subject: Reply with quote

Thank you Paul. Sure, that would be great.
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Thomas



Joined: 18 Feb 2005
Posts: 43
Location: Gummersbach, Germany

PostPosted: Thu Apr 22, 2021 3:29 pm    Post subject: New information on FTN95 options Reply with quote

Moji asked me for assistance and we detected the reason for different behaviour:

a) If compiled with

ftn95 /64 /debug

it works.

b) If compiled with

ftn95 /64 /debug /check

the problem occurs.
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Thomas
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PaulLaidler
Site Admin


Joined: 21 Feb 2005
Posts: 7089
Location: Salford, UK

PostPosted: Thu Apr 22, 2021 4:09 pm    Post subject: Reply with quote

OK thanks. I will take another look at it.
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PaulLaidler
Site Admin


Joined: 21 Feb 2005
Posts: 7089
Location: Salford, UK

PostPosted: Mon May 10, 2021 9:43 am    Post subject: Reply with quote

This turned out to be a failure in FTN95. It has now been fixed for the next release of FTN95.
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Moji



Joined: 30 Sep 2020
Posts: 18

PostPosted: Wed May 19, 2021 11:37 am    Post subject: Reply with quote

Paul,
I tested it again (with the new compiler and the new slink64). The Problem is still there and the debugger jumps directly to the last line of the function.
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PaulLaidler
Site Admin


Joined: 21 Feb 2005
Posts: 7089
Location: Salford, UK

PostPosted: Wed May 19, 2021 12:10 pm    Post subject: Reply with quote

Moji

Sorry about that. I will refer this back for further investigation.

I thought that I had tested this but maybe I did not add /check.
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PaulLaidler
Site Admin


Joined: 21 Feb 2005
Posts: 7089
Location: Salford, UK

PostPosted: Tue Jun 01, 2021 8:12 am    Post subject: Reply with quote

Hopefully this will now be fixed in the next release of FTN95.

I have tested the latest fix using first /CHECK and then /DEBUG.
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