Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com Delivered-To: mailing list cygwin AT cygwin DOT com Reply-To: Cygwin List Message-Id: <6.1.0.6.0.20040622120448.0322ec68@pop.prospeed.net> X-Sender: Date: Tue, 22 Jun 2004 12:07:07 -0400 To: "Alex Vinokur" , cygwin AT cygwin DOT com From: Larry Hall Subject: Re: gcc -mno-cygwin foo.c & gcc foo.c generate different behavior In-Reply-To: References: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" At 12:06 PM 6/22/2004, you wrote: >==================== >Windows 2000 >CYGWIN_NT-5.0 1.5.10-3 (0.116/4/2) >gcc (GCC) 3.3.1 (cygming special) >==================== > > > >------ foo.c ------ > >#include > >struct foo >{ > char* bar_; >}; > >int main() >{ >char* ch = "ABC"; >struct foo* f; > > f->bar_ = ch; /* gcc foo.c : Segmentation fault */ > printf("start\n"); > printf("---> %s\n", f->bar_); > printf("finish\n"); > > return 0; > >} > >------------------- > >$ gcc -mno-cygwin foo.c > >$ a >start >---> ABC >finish > >$ cygcheck a >Found: .\a.exe >a.exe > C:\WINNT\system32\msvcrt.dll > C:\WINNT\system32\KERNEL32.dll > C:\WINNT\system32\NTDLL.DLL > > >$ gcc foo.c > >$ a >Segmentation fault (core dumped) > >$ cygcheck a >Found: .\a.exe >a.exe > C:\cygwin\bin\cygwin1.dll > C:\WINNT\system32\ADVAPI32.DLL > C:\WINNT\system32\NTDLL.DLL > C:\WINNT\system32\KERNEL32.DLL > C:\WINNT\system32\RPCRT4.DLL > Incorrect code has a way of generating undefined behavior. Did you expect this to work? -- Larry Hall http://www.rfk.com RFK Partners, Inc. (508) 893-9779 - RFK Office 838 Washington Street (508) 893-9889 - FAX Holliston, MA 01746 -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/