Can't debug with READLN & WRITELN ???
lazarus / 12-Debugger

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xaero · 2010-05-26 07:20

Quoteprogram demo;
var
    i,n:integer;
begin
    readln(n);
    for i:=1 to n do
        writeln(i);
    readln;
end.
when I press F8 (RUN menu --> step over) ，Lazarus display a “assmbler”
window！(SEE THE gif blew)
how to step over "READLN(n) and debug it"？
windows xp sp3 + lazarus 0.9.28.2 with all default settings

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Troodon · 2010-05-26 08:05

Is that a console application? You cannot write in program in
traditional Pascal, it has to be a Lazarus/FPC console application.

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xaero · 2010-05-26 23:12

Yes ,it is a console application

what's your mean?

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bobo · 2010-05-27 00:02

You should download gdb (7.0+) and set it up in Lazarus (Environment
-> Options -> Debugger .

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xaero · 2010-05-27 02:16

Quote from: bobo on May 27, 2010, 02:02:38 amYou should download gdb
(7.0+) and set it up in Lazarus (Environment -> Options -> Debugger .

with gdb 7.1 ～～ still got the problem!

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Leledumbo · 2010-05-27 03:45

@Troodon:
I don't think it would have any effect either you choose pure program
or lazarus console application.

@Xaero:
Are you sure you're stepping over instead of stepping in? Well, I
never use lazarus to debug console apps, but this shouldn't happen.

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xaero · 2010-05-27 17:28

I'm sure i press F8, not F7!

Here's my steps:
1. PROJECT menu --> New Project
2. choose "custom program"
3. enter the following code, and save the project as demo.lpi:
Code: [Select]program demo;
var
    i,n:integer;
begin
    readln(n);
    for i:=1 to n do
        writeln(i);
    readln;
end.
4. press f8, lazarus set a gray line under the "begin" (see gif blew),
then I continue to press f8, lazarus got the error as the above
mentioned.

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DSav · 2010-06-03 10:30

Have got absolutely the same problem.
lazarus-0.9.28-fpc-2.2.4-win32

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Marc · 2010-06-06 07:59

The lazarus debugger currently doesn't support cmdline applications

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ryanhaynes · 2010-09-12 01:23

I don't know if this thread is closed since it is several months back
but I am having the same issue with console-app debugging Lazarus. I
should note that the program written above can be debugged if the
lines readln; and writeln(''); are added to the top of the console
application (there may be another fix but this is what I tried). When
debugging the original program (without the fix) in gdb it works fine.
So this has to be a simple bug in the Lazarus IDE right? Why can't
Lazarus debug a console app if gdb can? Please let me know if I'm
missing something.

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JuhaManninen · 2010-09-12 07:04

With Lazarus trunk 0.9.29, on Linux, I can debug console apps without
problems.
Lazarus should be started from command line itself so that writeln()
output goes to the same window.

Juha