On Friday 29 April 2016 00:09:23 Graeme Geldenhuys wrote:
> Hi Martin,
>
> Debugging FPC generated applications is lost to me. ;) Please see
> attached screenshot. I run the app from inside MSEide, I do a couple of
> things in my application, then get a "Exception EVariantError". Normally
> my first port of call is the Stack window. But that isn't much help in
> this case. Lazarus IDE shows the exact same stacktrace output, plus it
> pops up the Assembler window.
>
> So I opened the Assembler window in MSEide as well as the CPU window.
> But now I'm lost. What does that information tell me, and more
> importantly what can I do from there to find out exactly where in my
> source code (or any 3rd party code I'm using - it's all open source
> code) the error occurred.
>
> Normally if the Stack Trace doesn't tell me much, I know what code I
> recently modified, and go look in there. But in this specific situation
> I'm totally at a loss for where to look. So maybe all these debug
> windows in MSEide could give me a clue?
>
Is 'Project'-'Options'-'Debugger'-'Stop on Excep.' activated? What shows the
MSEide status line?
gdb can not follow the stack. First step is to compile *all* source including
FPC RTL and FCL with debuginfo in order to help gdb to find the stack
pointers.
I use this script for compiling:
"
#!/bin/sh
fpcdir=/home/mse/packs/standard/svn/fp/fixes_3_0
cd ${fpcdir}/rtl
make clean
cd ${fpcdir}/packages
make clean
cd ${fpcdir}
make OPT="-gl -O-" FPC=${fpcdir}/compiler/ppc386 rtl packages
cd ${fpcdir}/../mse
"
In my experience the FPC-gdb combination is more robust with STABS than DWARF
but on 64 bit STABS is not available.
When you have a RTL with debuginfo and there still is no usable stack
information try to set breakpoints everywhere where an EVariantError is
raised. A 'Search in Files' with "raise evarianterror" shows them.
Martin
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