Date: Wed, 19 Feb 92 17:27:44 GMT
From: LeBlanc AT manchester-computing-centre DOT ac DOT uk
Myname: A. V. Le Blanc
To: djgpp <@nsfnet-relay.ac.uk:djgpp AT sun DOT soe DOT clarkson DOT edu>
Subject: Problem with pow and djgpp
Status: O

 
Some time ago I asked for help with the following problem.
I have not yet received a response.  Perhaps someone new is
listening now!  DJ Delorie wrote me a most gracious note,
but his suggestion failed to solve the problem.
 
The following program seems to work on a UNIX system, but not
on DOS with the DJ Delorie implementation of gcc.  I would
very much like to know how to get it to work.  The DOS is
3.3, the machine is a 386sx without a maths coprocessor.
 
The following is what happens on a UNIX system:
 
     12:57:48> more testpow.c
     #include <stdio.h>
     #include <math.h>
 
     main(){
       double a,b,c;
       a = 2.0;
       b = 3.0;
       c = pow(a, b);
       printf("%f = pow(%f, %f)\n", c, a, b);
       exit(0);
     }
     12:57:49> gcc -c testpow.c
     gcc -o testpow 12:58:08> gcc -o testpow testpow.o -lm
     12:58:18> ./testpow
     8.000000 = pow(2.000000, 3.000000)
     12:58:21>
 
The following happens on MS-DOS:
 
     C:\WORK>set
     COMSPEC=C:\COMMAND.COM
     PROMPT=$P$G
     PATH=W:.;X:.;Y:.;C:\GNU;C:\DOS;C:\TELNET;C:\KERMIT;Z:.
     GCCBIN=m:\cc\bin
     GCCINC=m:/cc/include
     GCCLIB=m:/cc/lib
     TEMP=c:
     TZ=GMT0
     GO32=ansi emu m:/cc/emu387/emu387 driver m:/cc/drivers/vga.grd gw 640 gh 480
     BISON_SIMPLE=m:/cc/lib/bison.simple
     BISON_HAIRY=m:/cc/lib/bison.hairy
     FLEX_SKELETON=m:/cc/lib/flex.skeleton
     C:\WORK>gcc -c testpow.c
 
     C:\WORK>gcc -o testpow testpow.o -lm
 
     C:\WORK>go32 testpow
     w:/mccsoft/cc/bin/go32 Copyright (C) 1991 DJ Delorie
     2.1087770 = pow(2.0000000, 3.0000000)
 
I would very much appreciate any help with this problem.
 
     A. V. Le Blanc
     University of Manchester
     LeBlanc AT mcc DOT ac DOT uk