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From: "dje at google dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/65840] New: type of result of at least some libstdc++ xmethods is different than real operator
Date: Tue, 21 Apr 2015 22:40:00 -0000
X-Bugzilla-Reason: CC
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: libstdc++
X-Bugzilla-Version: 4.9.1
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X-Bugzilla-Severity: minor
X-Bugzilla-Who: dje at google dot com
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65840

            Bug ID: 65840
           Summary: type of result of at least some libstdc++ xmethods is
                    different than real operator
           Product: gcc
           Version: 4.9.1
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dje at google dot com

Using libstdc++-v3/testsuite/libstdc++-xmethods/unique_ptr.cc
as a testcase, and modifying it to ensure the * operator is compiled in:

--- gcc-unique_ptr.cc.~1~       2015-04-21 15:17:37.863001716 -0700
+++ gcc-unique_ptr.cc   2015-04-21 15:18:14.666458223 -0700
@@ -30,7 +30,7 @@ main ()
 // { dg-final { note-test *p 10 } }
 // { dg-final { regexp-test p.get() 0x.* } }

-  return 0;  // Mark SPOT
+  return *p;  // Mark SPOT
 }

 // { dg-final { gdb-test SPOT {} 1 } }

bash$ gdb a.out
(gdb) start
(gdb) n # keep next'ing until we get here:
33        return *p;  // Mark SPOT
(gdb) p *p
$1 = 10
(gdb) disable xm
(gdb) p *p
$2 = (int &) @0x403010: 10
(gdb) pt $1
type = int
(gdb) pt $2
type = int &

Note the difference in type of the result of the xmethod vs the real *
operator. IWBN if they had the same type. If this requires additions to gdb we
can do that.