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Date: Fri, 26 Aug 2016 07:30:21 -0700
Subject: Re: I sent in a bug report and never heard anything back
From: jeff AT jeffunit DOT com
To: cygwin AT cygwin DOT com
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In reference to http://sourceware.org/ml/cygwin/2016-08/msg00261.html

I wrote:
I have a small program that generates an internal compiler error.
This only happens on a new dell notebook with an Intel 3825U pentium .
The code compiles and runs fine on an older xeon and amd processors.
Enclosed is the output of cygcheck.

Here is what happens when I try to compile:

sh-4.3$ gcc bug_f2.c
bug_f2.c: In function 'Round':
bug_f2.c:23:5: internal compiler error: Illegal instruction
     return floor(d + 0.5);
     ^
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
sh-4.3$ exit

Here is the source code:

/#include <string.h>             /* strlen */
#include <math.h>               /* floor */
#include <limits.h>             /* INT_MAX, INT_MIN */
#include <assert.h>             /* assert */


/*+Input:       A double.
   Output:      Rounded input.
   Action:      Rounded input. +*/
extern double Round(double d)
{
    return floor(d + 0.5);
}


Marco Atzeri wrote:

the code compile on both 32bit and 64 bit version of gcc
for me.

As it is a not stand alone program

  gcc -c  bug_f2.c

should be used.

My reply:

Thanks for noting the code compiles on 32 and 64 bit architectures.
The code is over a decade old, and has compiled and worked on many ersions
of cygwin
and linux. I specifically mentioned it compiled on cygwin with different
processors.
That was never in question.

The issue is the internal compiler error coming from gcc on my dell with a
specific
intel processor. An internal compiler error does not mean the source code
has a syntax error,
it means the compiler has a bug (which I suspect is related to the
specific cpu).

Based on myexperience, the two most likely possibilities are:
1) somehow my cygwin installation is bad. That is why I included the
output of cygcheck.
2) there is a cpu specific internal compiler error with gcc.

If 1) is the case, it is possible there is a bug with the cygwin
installer. If 2) is the case,
then the bug should be reported to the gcc maintainers. Since the compiler
is a bit old,
I suspect they will say update the compiler, which is likely something
that cygwin should
do ao it may benefit everyone, not just me.

thanks,
jeff


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