[PATCH] Add anitizer_linux_x86_64.lo if __x86_64__ is defined by $CC

[H.J. Lu]

Since size of "void *" is 4 bytes for x32, check if __x86_64__ is defined
by $CC, instead of

if test x$ac_cv_sizeof_void_p = x8; then

to decide wether anitizer_linux_x86_64.lo should be used.

I am testing this on i686 and x86-64.  OK for trunk and GCC 7 branch if
there are no regression?  Please upstream it for me if appropriate.

Thanks.


H.J.
---
        PR sanitizer/82379
        * configure.tgt (ANITIZER_COMMON_TARGET_DEPENDENT_OBJECTS): Set
        to anitizer_linux_x86_64.lo if __x86_64__ is defined by $CC.
---
 libsanitizer/configure.tgt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libsanitizer/configure.tgt b/libsanitizer/configure.tgt
index 82e8a5513c5..573e3b482e9 100644
--- a/libsanitizer/configure.tgt
+++ b/libsanitizer/configure.tgt
@@ -27,6 +27,8 @@ case "${target}" in
                TSAN_SUPPORTED=yes
                LSAN_SUPPORTED=yes
                TSAN_TARGET_DEPENDENT_OBJECTS=tsan_rtl_amd64.lo
+       fi
+       if echo "int x = __x86_64__;" | $CC -c -x c -o /dev/null - > /dev/null 
2>&1; then
                
SANITIZER_COMMON_TARGET_DEPENDENT_OBJECTS=sanitizer_linux_x86_64.lo
        fi
        ;;
-- 
2.13.6