Mailing-List: contact cygwin-help AT sourceware DOT cygnus DOT com; run by ezmlm
List-Subscribe: <mailto:cygwin-subscribe AT sourceware DOT cygnus DOT com>
List-Archive: <http://sourceware.cygnus.com/ml/cygwin/>
List-Post: <mailto:cygwin AT sourceware DOT cygnus DOT com>
List-Help: <mailto:cygwin-help AT sourceware DOT cygnus DOT com>, <http://sourceware.cygnus.com/ml/#faqs>
Sender: cygwin-owner AT sourceware DOT cygnus DOT com
Delivered-To: mailing list cygwin AT sourceware DOT cygnus DOT com
Message-ID: <004e01bfa8bb$23346410$35758798@mis.amat.com>
From: "Serge Nikulin" <nikulin AT actsw DOT amat DOT com>
To: <cygwin AT sourceware DOT cygnus DOT com>
Subject: Help! cygwin's malloc does not work
Date: Mon, 17 Apr 2000 15:20:21 -0700
X-Priority: 3
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook Express 5.00.2919.6600
X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2919.6600

I try to use GNU tools for our internal embedded (m68k) project.

My host PC is NT 4.0 + sp6a + 512 MB RAM + 510 MB VRAM

The final linked COFF file with debug info takes about 45MB (mega bytes)
Cygnus-compiled gdb (target=m68k in remote mode) crashes while loading this
file.
I've traced the problem to cygwin1.dll
Basically, it looks like cygwin can not handle large memory allocations.
To prove this I scratched out very simple program:

int main()
{
  char * ptr = malloc(150000000); /* 150 MB */
  printf("%08X\n", ptr);
  free(ptr);
}

It works fine with MSVC and crashes with cygwin (CD 1.0):
    0 0 [sig] D:\test\a.exe 1000 stackdump: Dumping stack trace to
a.exe.stackdump

The latest version of Cygwin.dll does not crash but prints 00000000 (malloc
failed).

I could not trace the problem  in Cygwin.dll sources (I can not make it).
Win32-targeted GDB does not go to internals of cygwin.dll either.
MSVC' debugger does not understand cygwin1.dll debug info.

So I'm lost. I can not move furher.
Any help or suggestion?

BTW, the same problem occured when I've tried to use objcopy (coff->binary)
with that file.
Objcopy crashed. But I have MSVC-compiled objcopy so it is not the
showstopper.










--
Want to unsubscribe from this list?
Send a message to cygwin-unsubscribe AT sourceware DOT cygnus DOT com