Perl configuration on solaris 10

I believed the line ='-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 is an argument for file compilation environment, which explain that the perl installed on our system support larger files. 

  By any change would you know -xarch=v8 ? 

  Compiler: 

  cc='cc', ccflags ='-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -xarch=v8 -D_TS_ERRNO -DPERL_USE_SAFE_PUTENV',  

And also, I found an article that natively 64 bit systems need neither use64bitint and use64bitall.

root@crsdev1 # perl -V |grep use64bitall

     use64bitint=define use64bitall=undef uselongdouble=undef

Would there be any issue if one of the flags was defined and the other is not?