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Mail Archives: djgpp/1993/05/06/22:59:13

Date: Thu, 6 May 1993 22:28 EST
From: "Wonkoo Kim, EE, U. of Pittsburgh" <WKIM AT vms DOT cis DOT pitt DOT edu>
Subject: GCC hangs: Here is the code to reproduce the problem.
To: djgpp AT sun DOT soe DOT clarkson DOT EDU

/**
Problem summary again:

djgpp/gcc hangs(doesn't exit or abort from compiling stage until control-c)
when it compiles a specific source code.  If I rearrange the source code a 
little bit, gcc didn't hang.  
This problem indicates some possible bug in djgpp/gcc, and I can't understand
why it doesn't show up some messages or abort from the compiling stage (if my
code is wrong). 
(I don't know what he(gcc) is doing since there was no screen messages.)
**/

Here I am attatching the source codes that made the gcc hang. The files are
pkzipped and uuencoded.  You will get several files after unpacking.  Among
them, there are two .c files (analysis.c, analysiz.c) The difference of these
two files is just rearrangement of the code at the end of the files. 
(from if ...; if ...; style to if/else if style for return()'s) 
Nothing else is touched.

Please try to compile with

(Please add a line "char getch(void);" into (gcc_dir)\include\pc.h before
doing so, or commentout getch() in the source codes.  
cf. See my another message, subject: getch().)

	1. gcc -c -Wall analysis.c	\ 1st file (analysis.c)
	2. gcc -c -Wall -O analysis.c	/
	3. gcc -c -Wall analysiz.c	\ 2nd file (analysiz.c)
	4. gcc -c -Wall -O analysiz.c	/
On my machine (486/25MHz/8MB/msdos 5.0/qemm), 1, 2, and 4 make the gcc hanged.
For the case 3, gcc gives the output analysiz.o file.(with no error messages)
The compilation time is just less than 15 seconds for the case 3 on my pc.

I believe that the above BOTH two programs are correct.  Indeed, the 1st 
file (analysis.c), which cause gcc hang, is a working program with Borland C or 
Turbo C, and I have been using it for a long time.  I found this problem when 
I tried to compile it with djgpp/gcc.

Please try and then let me know the results.  If the trouble occurs only on my
machine, then .... very unlikely. I hope somebody can fix the problem.  I guess
gcc is trapped into an infinite loop and by somehow it seems to depend on the
programming habits.  So, please recommend how I can avoid this trouble (no
other way until gcc is fixed if it is a gcc bug.) I want -O compiling, but the
case 4 indicates there are still something else making gcc hang. 
(The compiled code by case 3 seems to be working.  Partly checked.)

(Do I have to worry about the compiler being trapped in writing a program?
Do I have to remove any gcc-trap in my source code?  Ridiculous.)


----- CUT HERE -----
section 1 of uuencode 5.21 of file gcchang.zip    by R.E.M.

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end
sum -r/size 23058/17256 section (from "begin" to "end")
sum -r/size 7956/12503 entire input file


- Raw text -


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