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From:	Ken Brown <kbrown AT cornell DOT edu>
Subject:	Re: Request update GCC
To:	cygwin AT cygwin DOT com
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Date:	Tue, 27 Jun 2017 22:22:37 -0400
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On 6/27/2017 7:32 AM, Marco Atzeri wrote:
> On 27/06/2017 03:08, JonY wrote:
>> On 06/26/2017 10:16 AM, Marco Atzeri wrote:
>>>
>>> Jon,
>>>
>>> are you building the compilers on cygwin or cross compiling ?
>>>
>>> I was trying to test the patch for
>>> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47030
>>> as it is blocking PETSC porting,
>>> but I was unable to build 6.3.0-1 from your
>>> source package.
>>>
>>>
>>> In file included from
>>> /cygdrive/e/cyg_pub/devel/gcc/gcc-6.3.0-1.src/gcc-6.3.0-1.
>>> x86_64/src/gcc-6.3.0/gcc/rtl.h:31:0,
>>>                  from
>>> /cygdrive/e/cyg_pub/devel/gcc/gcc-6.3.0-1.src/gcc-6.3.0-1.
>>> x86_64/src/gcc-6.3.0/gcc/genopinit.c:25:
>>> /cygdrive/e/cyg_pub/devel/gcc/gcc-6.3.0-1.src/gcc-6.3.0-1.x86_64/src/gcc-6.3.0/g 
>>>
>>>
>>> cc/real.h:36:35: warning: division by zero [-Wdiv-by-zero]
>>>  #define SIGSZ   (SIGNIFICAND_BITS / HOST_BITS_PER_LONG)
>>>
>>> /cygdrive/e/cyg_pub/devel/gcc/gcc-6.3.0-1.src/gcc-6.3.0-1.x86_64/src/gcc-6.3.0/g 
>>>
>>>
>>> cc/real.h:49:21: note: in expansion of macro ‘SIGSZ’
>>>    unsigned long sig[SIGSZ];
>>
>> On Cygwin itself, shouldn't that be 32bit and 64bit respectively for 
>> Cygwin?
> 
> In theory
> 
> gcc/real.h:#define SIGNIFICAND_BITS   (128 + HOST_BITS_PER_LONG)
> 
> gcc/hwint.h:#define HOST_BITS_PER_LONG  (CHAR_BIT * SIZEOF_LONG)
> 
> 
> but I do not understand why SIGSZ is wrong defined.

FWIW, I just rebuilt gcc-6.3.0-1 from source on 64-bit Cygwin without 
getting that warning.

Ken



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