Date: Sat, 26 Oct 1996 23:57:57 +0200
Message-Id: <3.0b36.16.19961026225755.0ae7603e@hal.nt.tuwien.ac.at>
To: djgpp AT delorie DOT com
From: Anton Helm <tony AT nt DOT tuwien DOT ac DOT at>
Subject: problem with cpp (?)
Mime-Version: 1.0
Content-Type: multipart/mixed; boundary="=====================_846395876==_"

--=====================_846395876==_
Content-Type: text/plain; charset="us-ascii"

I just discovered the following problem:

when compiling the attached c program parser.c (actually generated by bison)
in plain MS-DOS environment with CWSDPMI as DPMI server I get the
following output:

gcc -v -c parser.c
Reading specs from c:/djgpp/lib\specs
gcc version 2.7.2.1
 c:/djgpp/bin\cpp.exe -lang-c -v -undef -D__GNUC__=2 -D__GNUC_MINOR__=7
-Dunix -
Di386 -DGO32 -DMSDOS -DDJGPP=2 -DDJGPP_MINOR=1 -D__unix__ -D__i386__
-D__GO32__
-D__MSDOS__ -D__DJGPP__=2 -D__DJGPP_MINOR__=1 -D__unix -D__i386 -D__GO32
-D__MSD
OS -D__DJGPP=2 -D__DJGPP_MINOR=1 parser.c e:/gnu\ccjaaaaa
GNU CPP version 2.7.2.1 (80386, BSD syntax)
#include "..." search starts here:
#include <...> search starts here:
 c:/djgpp/include
 c:/djgpp/contrib/grx20/include
 /usr/local/include
 /usr/local/go32/include
 /usr/local/lib/gcc-lib/go32/2.7.2.1/include
 /usr/include
End of search list.
cpp.exe I/O error on output


gcc didn't return to DOS and locked the system completely. 
The screen was flickering slightly.
A hard reboot was necessary.
After rebooting I found the file e:/gnu\ccjaaaaa but its size was 0 byte.


The same command in a win3.1 DOS box worked fine:

gcc -v -c parser.c
Reading specs from c:/djgpp/lib\specs
gcc version 2.7.2.1
 c:/djgpp/bin\cpp.exe -lang-c -v -undef -D__GNUC__=2 -D__GNUC_MINOR__=7
-Dunix -
Di386 -DGO32 -DMSDOS -DDJGPP=2 -DDJGPP_MINOR=1 -D__unix__ -D__i386__
-D__GO32__
-D__MSDOS__ -D__DJGPP__=2 -D__DJGPP_MINOR__=1 -D__unix -D__i386 -D__GO32
-D__MSD
OS -D__DJGPP=2 -D__DJGPP_MINOR=1 parser.c e:/gnu\ccjaaaaa
GNU CPP version 2.7.2.1 (80386, BSD syntax)
#include "..." search starts here:
#include <...> search starts here:
 c:/djgpp/include
 c:/djgpp/contrib/grx20/include
 /usr/local/include
 /usr/local/go32/include
 /usr/local/lib/gcc-lib/go32/2.7.2.1/include
 /usr/include
End of search list.
 c:/djgpp/bin\cc1.exe e:/gnu\ccjaaaaa -quiet -dumpbase parser.c -version -o
e:/g
nu\cckaaaaa
GNU C version 2.7.2.1 (80386, BSD syntax) compiled by GNU C version 2.7.2.1.
 c:/djgpp/bin\as.exe -o parser.o e:/gnu\cckaaaaa


Experiments:
1) I tried changing the temporary directory in DJGPP.ENV
   to a different disk.
   Result: as above (the filename has changed...)
2) I tried calling cpp directly 
   cpp parser.c parser.cpp
   (no other commandline options)
   Result: it works fine. 
3) I tried cpp.exe of gcc v 2.7.2
   Result: as above (the version number of cpp changed...)
4) I tried cpp.exe of gcc v 2.6.3 (DJGPP v1.12m4 with go32.exe)
   Works in MS-DOS and win31 
5) Back to cpp.exe of gcc v 2.7.2.1
   Editing parser.c
   The problem was gone when I added a

   #define SOMETHING 123
           ^^^^^^^^^ ^^^
     (any name here) (any value here)

   at the top of parser.c .

   I found also some other methods to prevent cpp
   from crashing, but none of them actually changes
   the functionality of parser.c (just reformating, inserting dummy code
etc.) .

Software:
DJGPP v2.0.1
bison v 1.24 (was used to generate parser.c)
CWSDPMI V0.90+ (r3)
MS-DOS 6.22

Hardware: 486DX2, 20MB RAM, plenty of diskspace

(Yes, I checked all disks when I saw this "error on output" message. All
disks are OK.)

I think that there is a bug either in cpp or in CWSDPMI. Did anyone else 
observe such a behavior?

I'll continue experimenting with different releases of cpp, gcc and cwsdpmi
tomorrow and post some results.

Please reply by mail. I'm currently not reading news.


Regards,

Tony











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end

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*************************************************************************
Dipl.-Ing. Anton HELM            * mailto:tony AT nt DOT tuwien DOT ac DOT at
Institut fuer Nachrichtentechnik * http://dictator.nt.tuwien.ac.at/~tony/
und Hochfrequenztechnik          * http://www.tuwien.ac.at/nthft/
Guszhausstr. 25/389              * phoneto:+43-1-58801-3520
A-1040 Wien, AUSTRIA             * faxto:+43-1-5870583
*************************************************************************

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