From: pjfarley AT banet DOT net (Peter J. Farley III)
Newsgroups: comp.os.msdos.djgpp
Subject: SIGFPE causes bash 1.14.7 Invalid Page Exception
Date: Thu, 09 Jul 1998 02:43:38 GMT
Message-ID: <35a42993.4698410@news1.banet.net>
NNTP-Posting-Host: 32.100.112.193
Organization: IBM.NET
Lines: 78
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Precedence: bulk

[Posted and mailed to bash maintainer]

I have been trying to configure and build perl 5.004 from the DJGPP
sources (perl54s.zip), but when the Configure script tries to check
whether large floats can be cast to int32 by gcc, the resulting
program generates a SIGFPE and then bash crashes with a Win95 Invalid
Page exception, address 00F7:3374, interrupts in service 2, 13.

I believe a SIGFPE is generated because when I run the program under
COMMAND.COM and test the DOS errorlevel variable, DOS reports the
program returns errorlevel 3 (see tryit.bat below), and the only way
to do that is for the program to get a SIGFPE (see the code).

TIA for any help you can provide.

Problem details:

Operating environment: DJGPP V2.01, bash 1.14.7(2), gcc 2.7.2.1, Win95
DOS box, LFN=Y.

bash version: GNU bash, version 1.14.7(2) r3.1 w/multibyte extension

This is the program that Configure compiles and tries to execute:

============ try.c ====================
#include <sys/types.h>
#include <signal.h>
void blech() { exit(3); }
main()
{
        int i32;
        double f;
        int result = 0;
        signal(SIGFPE, blech);

        f = (double) 0x7fffffff;
        f = 10 * f;
        i32  = (int) f;

        if (i32 != (int) f)
                result |= 1;
        exit(result);
}
============ try.c ====================

This is the compile command Configure uses:

gcc -o try $ccflags try.c >/dev/null 2>&1

$ccflags has this value:

-I/include -I/usr/local/include

============ tryit.bat ====================
try
if errorlevel == 4 goto e4
if errorlevel == 3 goto e3
if errorlevel == 2 goto e2
if errorlevel == 1 goto e1
goto end
:e1
echo errorlevel set to 1
goto end
:e2
echo errorlevel set to 2
goto end
:e3
echo errorlevel set to 3
goto end
:e4
echo errorlevel set to 4
:end
============ tryit.bat ====================


----------------------------------------------------
Peter J. Farley III (pjfarley AT nospam DOT dorsai DOT org OR
                     pjfarley AT nospam DOT banet DOT net)