On Tue, Mar 20, 2012 at 11:36 AM, Martin <laza...@mfriebe.de> wrote: > On 20/03/2012 14:08, Marcos Douglas wrote: >> >> On Tue, Mar 20, 2012 at 9:34 AM, Martin<laza...@mfriebe.de> wrote: >>> >>> On 20/03/2012 12:08, Marcos Douglas wrote: >>>> >>>> Hi, >>>> >>>> I was testing the new connector to MSSQL when I found a problem. >>>> If I compile and run in console, I have no memleak. Good. But if I put >>>> a breakpoint in AConnection.Free; and press F8, I got this: >>>> >>>> ERROR >>>> ,msg="Warning:\nCannot insert breakpoint -237.\nError accessing memory >>>> address 0x7816cd30: Input/output error.\n" >>>> >>>> >>> A negative breakpoint means internal to gdb (like a breakpoint gdb sets >>> for >>> stepping). So when you press F8 gdb apparently can't get the correct >>> location where the step should end. >>> >>> Are you sure your app (and package that has debug info) are compiled: >>> - with either -O0 or -O1 (no other optimization enabled) >>> - your app is NOT smartlinked >>> >>> wiki.lazarus.freepascal.org/GDB_Debugger_Tips >> >> Martin, >> I recompiled FPC and Lazarus using -gl -gw2 -godwarfsets options, but >> the problem continues. >> > I don't know where/why it upsets gdb. > > The above will allow you to step into RTL/packages. > > It certainly is no error in the app, but a problem in the debug info (or > what gdb makes of it). > > There are 3 possibilities: > 1) FPC writes bad debug info. You can try -gs versus -gw (stabs/dwarf). > 2) The linker gets it wrong. Try -Xe > 3) gdb is buggy. Which version are you on?
I use gdb 7.3 (http://svn.freepascal.org/svn/lazarus/binaries/) only in 32 bit. > Do all lines get a blue dot? (except maybe "else" and empty lines) > Definitely yes. > ----------- > Where to get mssqlcon ? > > ---- In trunk http://svn.freepascal.org/svn/fpc/trunk/packages/fcl-db/src/sqldb/mssql/ But I had these sources because I tested for LacaK before merged in FPC sources. > As workarounds: > 1) Try setting a breakpoint on next command and use F9 > 2) Single step in assembler window (single step asm instructions) if I use F9 this problem does not occur. > Did you try to continue, after the error (if you are lucky, it might be > possible)? Yes, I tried. No is possible to continue and the negative number is going incrementing two by two. > -------- > For 64 bit, latest gdb (I have not tested it yet) > > http://sourceforge.net/projects/mingw-w64/files/Toolchains%20targetting%20Win64/Personal%20Builds/rubenvb/4.7.0-3/x86_64-w64-mingw32-gcc-4.7.0-3_rubenvb.7z/download > I only use 32 bit. Marcos Douglas _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
