[PATCH] linux-user: limit check to HOST_LONG_BITS == 32

["Alex Bennée" <alex.bennee@linaro.org>]

Newer clangs rightly spot that you can never exceed the full address
space of 64 bit hosts with:

  linux-user/elfload.c:2076:41: error: result of comparison 'unsigned
  long' > 18446744073709551615 is always false
  [-Werror,-Wtautological-type-limit-compare]
  4685         if ((guest_hiaddr - guest_base) > ~(uintptr_t)0) {
  4686             ~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~
  4687 1 error generated.

So lets limit the check to 32 bit hosts only.

Fixes: ee94743034bf
Reported-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
---
 linux-user/elfload.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/linux-user/elfload.c b/linux-user/elfload.c
index 01a9323a637..797fbf2337a 100644
--- a/linux-user/elfload.c
+++ b/linux-user/elfload.c
@@ -2072,6 +2072,7 @@ static void pgb_have_guest_base(const char *image_name, abi_ulong guest_loaddr,
                          image_name, (uint64_t)guest_hiaddr, reserved_va);
             exit(EXIT_FAILURE);
         }
+#if HOST_LONG_BITS == 32
     } else {
         if ((guest_hiaddr - guest_base) > ~(uintptr_t)0) {
             error_report("%s: requires more virtual address space "
@@ -2079,6 +2080,7 @@ static void pgb_have_guest_base(const char *image_name, abi_ulong guest_loaddr,
                          image_name, (uint64_t)guest_hiaddr - guest_base);
             exit(EXIT_FAILURE);
         }
+#endif
     }
 
     /*
-- 
2.20.1