[Bug 251636] archivers/c-blosc: fails to build with CPUTYPE=haswell

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251636

            Bug ID: 251636
           Summary: archivers/c-blosc: fails to build with CPUTYPE=haswell
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs at FreeBSD.org
          Reporter: greg at unrelenting.technology
                CC: iblis at hs.ntnu.edu.tw
             Flags: maintainer-feedback?(iblis at hs.ntnu.edu.tw)
                CC: iblis at hs.ntnu.edu.tw

/usr/ports/archivers/c-blosc/work/c-blosc-1.15.0/blosc/shuffle.c:171:1: error:
function cannot return function type 'int (uint32_t)' (aka 'int (unsigned
int)')
/usr/local/llvm11/lib/clang/11.0.0/include/xsaveintrin.h:35:42: note: expanded
from macro '_xgetbv'
#define _xgetbv(A) __builtin_ia32_xgetbv((long long)(A))
                                         ^
/usr/ports/archivers/c-blosc/work/c-blosc-1.15.0/blosc/shuffle.c:171:1: error:
definition of builtin function '__builtin_ia32_xgetbv'
/usr/local/llvm11/lib/clang/11.0.0/include/xsaveintrin.h:35:20: note: expanded
from macro '_xgetbv'
#define _xgetbv(A) __builtin_ia32_xgetbv((long long)(A))
                   ^
/usr/ports/archivers/c-blosc/work/c-blosc-1.15.0/blosc/shuffle.c:171:1:
warning: omitting the parameter name in a function definition is a C2x
extension [-Wc2x-extensions]
/usr/local/llvm11/lib/clang/11.0.0/include/xsaveintrin.h:35:43: note: expanded
from macro '_xgetbv'
#define _xgetbv(A) __builtin_ia32_xgetbv((long long)(A))
                                          ^
/usr/ports/archivers/c-blosc/work/c-blosc-1.15.0/blosc/shuffle.c:181:10: error:
use of undeclared identifier 'xcr'
    "c" (xcr)
         ^
2 warnings and 3 errors generated.



As a workaround, we can force unset cpu flags with

_CPUCFLAGS:=

as I've suggested for bug 251590 also.

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