[Mingw-users] msvcrt & w32api trouble on XP

[Arto H. <art...@ut...>]

Hello,

I am having some serious trouble running my application on Windows XP
systems. I'm compiling it with MinGW, and I use both MSVCRT and W32API
(this is a GUI application). The code runs stable on 95, 98, NT and W2k,
and presumably ME also (and the GTK GUI version runs stable on *NIX
systems).

What I see is, I think, most likely heap corruption, related to
MSVCRT malloc/calloc/free. No other explanation I really can't see
for crashes in code that runs stable everywhere else.

(For example, I do "ptr = calloc (1, 12)", and the returned ptr
most certainly is not NULL, this is checked. Accessing the
first 4 bytes of the memory works, but (reading drwatson log),
I see access to the next 4 bytes as causing the crash)

The crashes are reproducible, and always happen in the same
places if I do certain actions. However, if I do different (often
far more complex) things in the app, the same code,
where crashes occur, run stable.

Browsing with google and in MSDN, I managed to find information
that linking in multiple CRT libs will cause funny results, so
I started investigating on that.

Looking at my exe's headers, there is only one MSVCRT (although
it is mentioned twice, with different symbols). Looking at
Dr. Watson's crash log, I see no other CRT libs (there is
RPCRT, but apparently that is RPC RT; then there is MSCFT,
of which I don't know about).


Any advice, thoughts, what should I do. I will examine what
is going on more thoroughly tonight, but I don't feel very
optimistic in finding anything...

-- 
arto