[gdb/testsuite] Fix gdb.cp/casts.exp with -m32

When running test-case gdb.cp/casts.exp with target board unix/-m32, I run
into:
...
(gdb) print (unsigned long long) &gd == gd_value^M
$31 = false^M
(gdb) FAIL: gdb.cp/casts.exp: print (unsigned long long) &gd == gd_value
...

With some additional printing, we can see in more detail why the comparison
fails:
...
(gdb) print /x &gd^M
$31 = 0xffffc5c8^M
(gdb) PASS: gdb.cp/casts.exp: print /x &gd
print /x (unsigned long long)&gd^M
$32 = 0xffffc5c8^M
(gdb) PASS: gdb.cp/casts.exp: print /x (unsigned long long)&gd
print /x gd_value^M
$33 = 0xffffffffffffc5c8^M
(gdb) PASS: gdb.cp/casts.exp: print /x gd_value
print (unsigned long long) &gd == gd_value^M
$34 = false^M
(gdb) FAIL: gdb.cp/casts.exp: print (unsigned long long) &gd == gd_value
...

The gd_value is set by this assignment:
...
  unsigned long long gd_value = (unsigned long long) &gd;
...

The problem here is directly casting from a pointer to a non-pointer-sized
integer.

Fix this by adding an intermediate cast to std::uintptr_t.

Tested on x86_64-linux with native and target board unix/-m32.

1 files changed, 3 insertions, 1 deletions

diff --git a/gdb/testsuite/gdb.cp/casts.cc b/gdb/testsuite/gdb.cp/casts.cc
index ea4dc96..f64d13c 100644
--- a/gdb/testsuite/gdb.cp/casts.cc
+++ b/gdb/testsuite/gdb.cp/casts.cc
@@ -1,3 +1,5 @@
+#include <cstdint>
+
 struct A
 {
   int a;
@@ -65,7 +67,7 @@ main (int argc, char **argv)
   LeftRight gd;
   gd.left = 23;
   gd.right = 27;
-  unsigned long long gd_value = (unsigned long long) &gd;
+  unsigned long long gd_value = (unsigned long long) (std::uintptr_t)&gd;
   unsigned long long r_value = (unsigned long long) (Right *) &gd;
 
   return 0;  /* breakpoint spot: casts.exp: 1 */