[Solved] Debugging DLL?
lazarus / 12-Debugger

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st · 2010-11-20 22:45

I have 2 simple projects: EXE and DLL both compiled in Lazarus with
"-g -gl" options.
EXE is defined as "host application" in "Run parameters" of DLL
project.
When I run DLL in Lazarus and try to stop it on any breakpoints
nothing is happened (breakpoints are marked "?").

I tried Lazarus "snapshot" :
Lazarus-0.9.29-28296-fpc-2.4.2-20101118-win64.exe
Lazarus-0.9.29-28360-fpc-2.4.3-20101120-win32.exe

I tried both 32 and 64 Lazarus on Vista64 and 32 Lazarus on XP - no
luck.

How can I debug DLL ?
What is a right way to debug a DLL in Lazarus ?

Thanks in advance

P.S. It works well on Delphi 2009 Win32...

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ivan17 · 2010-11-21 08:43

i don't think that works (yet), though i'd be happy if someone were to
prove me wrong.

there is always the i'm-my-own-debugger way - at important points you
display variables in a message box or dump them into a text file...

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Martin_fr · 2010-11-21 12:11

What version of GDB do you use?

I tested (on windows) with gdb 7.2-1 and I was able to step into a DLL

Having said that:

Steeping from the hos-app, into the dll with F7 does not seem to work
reliable.

but stepping inside the dll (once in there) and breakpoints are fine.

--Edit:
Oh, and i do not have any custom library loading code, I let the Os
load the lib, at application start.

If you have your own calls to load the library by hand, you may (don't
know / maybe not, maybe it even work then) have to wait until the
library is loaded, before you can insert the breakpoint.

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st · 2010-11-21 15:48

Yes, it works with Lazarus 0.9.29 r28360 FPC 2.4.3
i386-win32-win32/win64
I updated GBD from 7.0 (included in package) to 7.2 with
libexpat-1.dll.

It works with Lazarus Win32 on Vista 64 for both of my DLLs (one is
loaded at EXE's startup and others are dynamically loaded at runtime
by name like plug-in).

So it may be a good idea to update the current snapshot package with
new GBD.

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ivan17 · 2010-11-21 18:47

ok, i just downloaded new gdb.exe and libexpat-1.dll and everything
works nicely. thanks martin!

Quote from: Martin_fr on November 21, 2010, 01:11:41 pmSteeping from
the hos-app, into the dll with F7 does not seem to work reliable.

but stepping inside the dll (once in there) and breakpoints are fine.
true. also, i noticed that stepping OUT works. groovy.