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?