Mail Archives: cygwin/2006/10/27/06:54:24
Hi everyone,
I'd just like to report that this issue has been resolved. It would
seem that my Cygwin installation had never completed properly. A
fresh installation fixed the issue.
Hugh
On 21/10/06, Hugh McMaster <dasjournal AT gmail DOT com> wrote:
> > Hi Brian,
> >
> > I apologise for the lack of information that I have provided in my
> > previous message.
> >
> > Portaudio provides the ability to create cross platform audio I/O
> > libraries ( http://www.portaudio.com). That aside, I am using the
> > latest version of Cygwin (all stable release packages), and the latest
> > version of Portaudio.
> >
> > To configure, compile, and install Portaudio in Cygwin, I used
> > './configure', then 'make', and then finally 'make install'. The
> > process went perfectly, apart from the need to use 'autoreconf' before
> > starting the process to recreate the 'configure' file. I have
> > attempted using Portaudio with static libraries, and also shared
> > libraries.
> >
> > Everytime I start my binary, I always end up with that exception fault
> > displayed in my previous message. I will run the debug sequence, and
> > have a look at what is going on.
> >
> > Hugh
> >
> > On 21/10/06, Brian Dessent <brian AT dessent DOT net> wrote:
> > > Hugh McMaster wrote:
> > >
> > > > I can successfully compile and install Portaudio in Cygwin (after
> > > > performing autoreconf). I have been using dynamic libraries
> > > > (specifically cygportaudio-2.dll) I can even compile my own sources.
> > > > When attempting to run the resulting Win32 binary, I get an error,
> > > > that I cannot even begin to make sense of.
> > >
> > > I have no idea what portaudio is, and I'm sure I'm not alone. It's not
> > > an official Cygwin package. I'm sure I could google it, and find its
> > > homepage, and read a little bit about it, and maybe dig around and find
> > > a tarball somewhere.
> > >
> > > Even if I had that information I have no idea what options, methods, or
> > > patches you used to compile it, or what commands or options you used to
> > > invoke it, or what files you supplied as input, or really what you were
> > > trying to do with it. In other words, you've given almost no useful
> > > information. It's kind of the analog of walking into a room of complete
> > > strangers and asking, "Hey does anyone know what's up with Steve?"
> > > (Who's Steve?)
> > >
> > > > Exception: STATUS_ACCESS_VIOLATION at eip=0048C2C0
> > >
> > > This means there was an access violation exception. This is Windows-ese
> > > for "Segmentation fault". It is a generic error that occurs when a
> > > process tries to access a page of memory that it does not have access
> > > to. This can be caused by hundreds of different things - dereferencing
> > > a NULL or otherwise uninitialized pointer, walking off the end of an
> > > unterminated buffer, stack corruption, and on and on. It is a very
> > > generic symptom of a bug in the code, or a logic error in the code, or
> > > false assumptions about the environment the code will be executing in,
> > > or any number of other problems.
> > >
> > > In other words, you'll have to actually debug the program. The address
> > > of the fault (0x004xxxxx) does imply that it is happening in the main
> > > binary image and not a DLL, but that's not a given either. Compile with
> > > debugging symbols (-g) and use gdb and figure out what's going on. Or
> > > use the error_start parameter of $CYGWIN to launch the debugger at the
> > > fault instead of the default action of creating the .stackdump file.
> > >
> > > > Stack trace:
> > > > Frame Function Args
> > > > 5ED4CCB8 0048C2C0 (00000000, 00290A60, 00001000, 67144A5D)
> > > > 5ED4CCF8 67145B1F (002848E0, 5ED4CD5C, 002917F0, 00000002)
> > > > 5ED4CDB8 671498A5 (00284890, 5ED4CDF0, 671496B0, 5ED4CDF0)
> > > > 671496B0 61004416 (00ACEC81, 4D8B0000, 9445C708, 00000000)
> > >
> > > A naked stack trace of self-compiled code does not do any good. We have
> > > no idea what those addresses correspond to.
> > >
> > > > Does anyone know what is wrong with the library file that has been
> > > > created on Cygwin? Should I completely reinstall Cygwin?
> > >
> > > Please forgive the following analogy.
> > >
> > > Reinstalling is the equivalent of popping the hood, staring at the
> > > engine for a while, then closing the hood and trying to turn it over
> > > again -- it doesn't actually do anything to fix the underlying problem,
> > > unless that problem was a loose hood. And if it does work it was a
> > > coincidence, just as sometimes letting the engine cool off will allow it
> > > to start again. But in those cases it would have also worked if you had
> > > just sat there for a while twiddling your thumbs and so it certainly
> > > wasn't due to opening the hood and staring.
> > >
> > > Brian
> >
>
>
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