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Subject:	Re: Request update GCC
To:	cygwin AT cygwin DOT com
References:	<594f1e45 DOT 14119d0a DOT 73dda DOT b6f9 AT mx DOT google DOT com> <3a4f8ce8-e76c-678c-c11c-e91366e57ec7 AT gmail DOT com> <028199b4-9ff5-a384-34f0-73a323fbcfa0 AT gmail DOT com> <75758c6e-a76e-02b2-5b72-ac43fa666a20 AT gmail DOT com>
From:	Marco Atzeri <marco DOT atzeri AT gmail DOT com>
Message-ID:	<edeb74a7-60b2-08ce-9c2d-7e5998e1e6f2@gmail.com>
Date:	Tue, 27 Jun 2017 13:32:52 +0200
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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.






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