Differences between release and debug

Hi,

does anyone know what would be the (most common) reasons
to get difference answers in VC++.net between running in
release and debug ?

Thanks,

JC

Nov 16 '05 #1

Subscribe Reply

4156

Carl Daniel [VC++ MVP]

je**********@ed s.com wrote:

Hi,

does anyone know what would be the (most common) reasons
to get difference answers in VC++.net between running in
release and debug ?

Reliance on content of uninitialized memory.

-cd

Nov 16 '05 #2

Patrick Philippot

je**********@ed s.com wrote:

Hi,
does anyone know what would be the (most common) reasons
to get difference answers in VC++.net between running in
release and debug ?

For unmanaged code, the two main reasons for getting a different
behavior between release and debug versions are :

1/ The memory allocation mechanism. Unitialized or incorrectly
initiliazed pointers will be handled differently.

2/ Optimizations which are usually disabled in debug versions. For
example, my current project systematically crashes under Win9x when I
optimize for speed or size (I'm using VC6 for this one but the same
remarks apply). If I disable optimizations or use default optimization,
there's no problem. The same program runs fine in all cases under Win NT
+.

What differences are you observing?

--
Patrick Philippot - Microsoft MVP [.Net]
MainSoft Consulting Services
www.mainsoft.xx
(replace .xx with .fr when replying by e-mail)

Nov 16 '05 #3

I am seing exceptions thrown in release mode that do not
occur in debug mode.

The optimisation is critical as there is usually a factor
of 10 speed between release and debug. So my next question
is ...

Is there a compile flag in debug that will set all
uninitialised variable to invalid values and show where
the problem is ?

Thanks,

-----Original Message-----
je**********@e ds.com wrote:
Hi,
does anyone know what would be the (most common) reasons
to get difference answers in VC++.net between running in
release and debug ?
For unmanaged code, the two main reasons for getting a

differentbehavior between release and debug versions are :

1/ The memory allocation mechanism. Unitialized or incorrectlyinitiliazed pointers will be handled differently.

2/ Optimizations which are usually disabled in debug versions. Forexample, my current project systematically crashes under Win9x when Ioptimize for speed or size (I'm using VC6 for this one but the sameremarks apply). If I disable optimizations or use default optimization,there's no problem. The same program runs fine in all cases under Win NT+.

What differences are you observing?

--
Patrick Philippot - Microsoft MVP [.Net]
MainSoft Consulting Services
www.mainsoft.xx
(replace .xx with .fr when replying by e-mail)

.

Nov 16 '05 #4

Doug Forster

Hi,

Is there a compile flag in debug that will set all
uninitialised variable to invalid values and show where
the problem is ?
Debug does this by default I think. Which version of VS are you using? Does
your app still crash when you vary the optimization settings? I had similar
sounding problems which simply vanished with VS 2003

Cheers

Doug Forster

<je**********@e ds.com> wrote in message
news:08******** *************** *****@phx.gbl.. . I am seing exceptions thrown in release mode that do not
occur in debug mode.

The optimisation is critical as there is usually a factor
of 10 speed between release and debug. So my next question
is ...

Is there a compile flag in debug that will set all
uninitialised variable to invalid values and show where
the problem is ?

Thanks,

-----Original Message-----
je**********@e ds.com wrote:
Hi,
does anyone know what would be the (most common) reasons
to get difference answers in VC++.net between running in
release and debug ?

For unmanaged code, the two main reasons for getting a

different
behavior between release and debug versions are :

1/ The memory allocation mechanism. Unitialized or

incorrectly
initiliazed pointers will be handled differently.

2/ Optimizations which are usually disabled in debug

versions. For
example, my current project systematically crashes under

Win9x when I
optimize for speed or size (I'm using VC6 for this one

but the same
remarks apply). If I disable optimizations or use default

optimization,
there's no problem. The same program runs fine in all

cases under Win NT
+.

What differences are you observing?

--
Patrick Philippot - Microsoft MVP [.Net]
MainSoft Consulting Services
www.mainsoft.xx
(replace .xx with .fr when replying by e-mail)

.

Nov 16 '05 #5

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