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Message-ID: <C9150052B112D3119E9E0004ACA6E4370345C7FE@tepg1.tepg.co.uk>
From: "Bruce Adams [TEPG Sunbury]" <bruadams AT tycoint DOT com>
To: <cygwin AT cygwin DOT com>
Subject: Exception: STATUS_PRIVILEGED_INSTRUCTION occurs before main is executed.
Date: Mon, 3 Mar 2003 10:12:00 -0000 
MIME-Version: 1.0
X-OriginalArrivalTime: 03 Mar 2003 10:13:09.0875 (UTC) FILETIME=[7DD76C30:01C2E16D]


Hi,
   I have lately been having real problems with vanilla gcc 3.2 generating
executables that
crash.  Its manifestation does not seem to follow an obvious pattern and
changing
the options to gcc (e.g. -ggdb versus -gstabs or no -g at all) 
does not make any difference.
Does anybody have any idea why this happens? And more importantly what I
can do about it.  
See partial stack trace below:

  375 1393032 [main] TestObject 992 fhandler_base::set_flags: filemode set
to bi
nary
 1790 1394822 [main] TestObject 992 fhandler_console::open: opened conin$
0x7, c
onout$ 0x1B
12213 1407035 [main] TestObject 992 fhandler_console::output_tcsetattr: 0 =
tcse
tattr (,A020018) (ENABLE FLAGS 3) (lflag 107 oflag 9)
  309 1407344 [main] TestObject 992 dtable::init_std_file_from_handle: fd 2,
han
dle 0xB
  260 1407604 [main] TestObject 992 dll_crt0_1: user_data->main 0x4010AC
  769 1408373 [main] TestObject 992 handle_exceptions: In
cygwin_except_handler
exc 0xC0000096 at 0x401072 sp 0x22FEBC
  311 1408684 [main] TestObject 992 handle_exceptions: In
cygwin_except_handler
sig = 4 at 0x401072
  251 1408935 [main] TestObject 992 handle_exceptions: In
cygwin_except_handler
calling 0x0
1444909 [main] TestObject 992 handle_exceptions: Exception:
STATUS_PRIVILEGED_IN
STRUCTION
35974 1444909 [main] TestObject 992 handle_exceptions: Exception:
STATUS_PRIVILE
GED_INSTRUCTION
 2257 1447166 [main] TestObject 992 try_to_debug: debugger_command ''


The simplest way to reproduce the problem is to have a main function in a
file with a .h of the same name as below.  If main is moved to a another
file and
Compiled separately the exception does not occur.  In more complicated
programs
however, the solution is not obvious.  


TestObject.h
============

typedef unsigned long tetrabyte;
class TestObject {
private:
    tetrabyte oTestData;
public:
    TestObject(void);
}; //TestObject


TestObject.cpp
==============


#include "TestObject.h"


TestObject::TestObject(void):
    oTestData(0)
{
};

#ifdef LINT
#define GCC_UNUSED
#else
#define GCC_UNUSED __attribute__((unused))
#endif

#ifdef MAIN
int main(int /*argc*/,char** /*argv*/) {
    TestObject A GCC_UNUSED;
    return 0;
} //main
#endif


Test.cpp
========

#include "TestObject.h"

#ifdef LINT
#define GCC_UNUSED
#else
#define GCC_UNUSED __attribute__((unused))
#endif

int main(int /*argc*/,char** /*argv*/) {
    TestObject A GCC_UNUSED;
    return 0;
} //main


Makefile
========

all: Test TestObject

TestObject2.o: TestObject.cpp TestObject.h
    gcc -c -x c++ $< -o $@

TestObject.o: TestObject.cpp TestObject.h
    gcc -c -x c++ -DMAIN $< -o $@

TestObject.exe: TestObject.o
    gcc $< -o$@ -lstdc++

TestObject: TestObject.exe
    .\TestObject.exe


Test.o: Test.cpp
    gcc -c -x c++ $< -o $@

Test.exe: Test.o TestObject2.o
    gcc $< TestObject2.o -o$@ -lstdc++

Test: Test.exe
    .\Test.exe 


==
It seems to me that having main in TestObject.cpp should be perfectly legal
so
why doesn't it work?
How can I prevent this error in the general case?
						Regards,
							 Bruce A.


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